chore: bump version

Skip incomplete series check on server startup to reduce
startup time. Can be re-enabled by restoring _check_media_scan_status().

.dockerignore

@@ -17,6 +17,9 @@ __pycache__/
 # Docker files (not needed inside the image)
 Docker/
 
+# Exception: VERSION is needed by Dockerfile.app
+!Docker/VERSION
+
 # Test and dev files
 tests/
 Temp/

.gitignore

@@ -4,6 +4,7 @@
 /src/__pycache__/*
 /src/__pycache__/
 /.vs/*
+/.venv/*
 /src/Temp/*
 /src/Loaders/__pycache__/*
 /src/Loaders/provider/__pycache__/*
@@ -81,4 +82,5 @@ Temp/
 temp/
 tmp/
 *.tmp
-.coverage
+.coverage
+.venv/bin/dotenv

.vscode/settings.json

@@ -1,8 +1,11 @@
 {
-    "python.defaultInterpreterPath": "C:\\Users\\lukas\\anaconda3\\envs\\AniWorld\\python.exe",
+    "python.defaultInterpreterPath": "${workspaceFolder}/.venv/bin/python",
     "python.terminal.activateEnvironment": true,
-    "python.condaPath": "C:\\Users\\lukas\\anaconda3\\Scripts\\conda.exe",
     "python.terminal.activateEnvInCurrentTerminal": true,
+    "terminal.integrated.env.linux": {
+        "VIRTUAL_ENV": "${workspaceFolder}/.venv",
+        "PATH": "${workspaceFolder}/.venv/bin:${env:PATH}"
+    },
     "python.linting.enabled": true,
     "python.linting.flake8Enabled": true,
     "python.linting.pylintEnabled": true,

Docker/Containerfile

@@ -13,12 +13,13 @@ RUN apk add --no-cache \
 # Create wireguard config directory (config is mounted at runtime)
 RUN mkdir -p /etc/wireguard
 
-# Copy entrypoint
+# Copy version file and entrypoint
+COPY VERSION /etc/wireguard/VERSION
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
 # Health check: can we reach the internet through the VPN?
-HEALTHCHECK --interval=30s --timeout=10s --retries=3 \
-    CMD ping -c 1 -W 5 1.1.1.1 || exit 1
+HEALTHCHECK --interval=30s --timeout=10s --retries=5 \
+    CMD curl -sf --max-time 5 http://1.1.1.1 || exit 1
 
 ENTRYPOINT ["/entrypoint.sh"]

Docker/Dockerfile.app

@@ -2,12 +2,13 @@ FROM python:3.12-slim
 
 WORKDIR /app
 
-# Install system dependencies for compiled Python packages
+# Install system dependencies for compiled Python packages and ffmpeg for HLS support
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
         gcc \
         g++ \
         libffi-dev \
+        ffmpeg \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Python dependencies (cached layer)
@@ -19,6 +20,7 @@ COPY src/ ./src/
 COPY run_server.py .
 COPY pyproject.toml .
 COPY data/config.json ./data/config.json
+COPY Docker/VERSION ./Docker/VERSION
 
 # Create runtime directories
 RUN mkdir -p /app/data/config_backups /app/logs

Docker/VERSION

@@ -0,0 +1 @@
+v1.3.6

Docker/entrypoint.sh

@@ -1,6 +1,14 @@
 #!/bin/bash
 set -e
 
+VERSION_FILE="/etc/wireguard/VERSION"
+if [ -f "$VERSION_FILE" ]; then
+    VERSION=$(cat "$VERSION_FILE")
+else
+    VERSION="unknown"
+fi
+echo "[init] VPN Container Entrypoint ${VERSION}"
+
 INTERFACE="wg0"
 MOUNT_CONFIG="/etc/wireguard/${INTERFACE}.conf"
 CONFIG_DIR="/run/wireguard"
@@ -64,9 +72,11 @@ setup_killswitch() {
     iptables -A INPUT  -i "$INTERFACE" -j ACCEPT
     iptables -A OUTPUT -o "$INTERFACE" -j ACCEPT
 
-    # Allow DNS to the VPN DNS server (through wg0)
-    iptables -A OUTPUT -o "$INTERFACE" -p udp --dport 53 -j ACCEPT
-    iptables -A OUTPUT -o "$INTERFACE" -p tcp --dport 53 -j ACCEPT
+    # Allow DNS (VPN DNS servers are routed through wg0; allow before routing decision)
+    iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
+    iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
+    iptables -A INPUT  -p udp --sport 53 -j ACCEPT
+    iptables -A INPUT  -p tcp --sport 53 -j ACCEPT
 
     # Allow DHCP (for container networking)
     iptables -A OUTPUT -p udp --dport 67:68 -j ACCEPT
@@ -101,7 +111,9 @@ setup_killswitch() {
 # ──────────────────────────────────────────────
 enable_forwarding() {
     echo "[init] Enabling IP forwarding..."
-    if echo 1 > /proc/sys/net/ipv4/ip_forward 2>/dev/null; then
+    if cat /proc/sys/net/ipv4/ip_forward 2>/dev/null | grep -q 1; then
+        echo "[init] IP forwarding already enabled."
+    elif echo 1 > /proc/sys/net/ipv4/ip_forward 2>/dev/null; then
         echo "[init] IP forwarding enabled via /proc."
     else
         echo "[init] /proc read-only — relying on --sysctl net.ipv4.ip_forward=1"
@@ -118,35 +130,91 @@ start_vpn() {
     ip link add "$INTERFACE" type wireguard
 
     # Apply the WireGuard config (keys, peer, endpoint)
+    # Filter out wg-quick directives that wg setconf doesn't understand
     wg setconf "$INTERFACE" <(grep -v -i '^\(Address\|DNS\|MTU\|Table\|PreUp\|PostUp\|PreDown\|PostDown\|SaveConfig\)' "$CONFIG_FILE")
 
+    # Log public key so it can be verified against the server's peer list
+    local PUBKEY
+    PUBKEY=$(wg show "$INTERFACE" public-key 2>/dev/null || echo "unknown")
+    echo "[vpn] Public key: ${PUBKEY}"
+
     # Assign the address
     ip -4 address add "$VPN_ADDRESS" dev "$INTERFACE"
 
-    # Set MTU
+    # Set MTU and bring up
     ip link set mtu 1420 up dev "$INTERFACE"
 
-    # Find default gateway/interface for the endpoint route
+    # ── fwmark-based routing (mirrors wg-quick behavior) ──
+    # WireGuard marks its own encapsulated UDP packets with this fwmark.
+    # Policy rules then ensure:
+    #   - Normal packets (no mark) → VPN routing table → wg0
+    #   - WireGuard-encapsulated packets (marked) → main table → eth0
+    local FW_MARK=51820
+    local FW_TABLE=51820
+    wg set "$INTERFACE" fwmark "$FW_MARK"
+
+    # Remove any auto-created default route on wg0
+    ip route del default dev "$INTERFACE" 2>/dev/null || true
+
+    # VPN routing table: send everything through the tunnel
+    ip -4 route add default dev "$INTERFACE" table "$FW_TABLE"
+
+    # Policy rules:
+    # 1. Packets NOT marked by WireGuard use the VPN table (→ wg0)
+    # 2. suppress_prefixlength 0: ignore bare default routes in main table,
+    #    but keep more-specific routes (e.g. LAN, endpoint) working
+    ip -4 rule add not fwmark "$FW_MARK" table "$FW_TABLE"
+    ip -4 rule add table main suppress_prefixlength 0
+
+    # Find default gateway/interface
     DEFAULT_GW=$(ip route | grep '^default' | head -1 | awk '{print $3}')
     DEFAULT_IF=$(ip route | grep '^default' | head -1 | awk '{print $5}')
 
-    # Route VPN endpoint through the container's default gateway
+    # ── Policy routing: ensure responses to incoming LAN traffic go back via eth0 ──
     if [ -n "$DEFAULT_GW" ] && [ -n "$DEFAULT_IF" ]; then
-        ip route add "$VPN_ENDPOINT/32" via "$DEFAULT_GW" dev "$DEFAULT_IF" 2>/dev/null || true
+        # Get the container's eth0 IP address (BusyBox-compatible, no grep -P)
+        ETH0_IP=$(ip -4 addr show "$DEFAULT_IF" | awk '/inet / {split($2, a, "/"); print a[1]}' | head -1)
+        ETH0_SUBNET=$(ip -4 route show dev "$DEFAULT_IF" | grep -v default | head -1 | awk '{print $1}')
+        if [ -n "$ETH0_IP" ] && [ -n "$ETH0_SUBNET" ]; then
+            echo "[vpn] Setting up policy routing for incoming traffic (${ETH0_IP} on ${DEFAULT_IF})"
+            ip route add default via "$DEFAULT_GW" dev "$DEFAULT_IF" table 100 2>/dev/null || true
+            ip route add "$ETH0_SUBNET" dev "$DEFAULT_IF" table 100 2>/dev/null || true
+            ip rule add from "$ETH0_IP" table 100 priority 100 2>/dev/null || true
+            echo "[vpn] Policy routing active — incoming connections will be routed back via ${DEFAULT_IF}"
+        fi
     fi
 
-    # Route all traffic through the WireGuard tunnel
-    ip route add 0.0.0.0/1 dev "$INTERFACE"
-    ip route add 128.0.0.0/1 dev "$INTERFACE"
-
-    # Set up DNS
+    # Set up DNS (handle comma-separated DNS servers)
     VPN_DNS=$(grep -i '^DNS' "$CONFIG_FILE" | head -1 | sed 's/.*= *//;s/ //g')
     if [ -n "$VPN_DNS" ]; then
-        echo "nameserver $VPN_DNS" > /etc/resolv.conf
-        echo "[vpn] DNS set to ${VPN_DNS}"
+        # Clear resolv.conf and add each DNS server on its own line
+        > /etc/resolv.conf
+        for dns in $(echo "$VPN_DNS" | tr ',' ' '); do
+            echo "nameserver $dns" >> /etc/resolv.conf
+            # Add explicit route to DNS server through wg0 so it's found in main table
+            # (suppress_prefixlength 0 ignores default routes but allows host routes)
+            ip -4 route add "$dns" dev "$INTERFACE" 2>/dev/null || true
+        done
+        echo "[vpn] DNS set to: ${VPN_DNS}"
     fi
 
+    # Add explicit host route for the health-check target so it is picked up by
+    # the 'lookup main suppress_prefixlength 0' rule (same as DNS servers above).
+    # Without this, CHECK_HOST falls through to the VPN table default route whose
+    # source-address selection can be defeated by the priority-100 'from ETH0_IP'
+    # policy rule, causing pings to bypass wg0 and be dropped by the kill switch.
+    ip -4 route add "${CHECK_HOST}" dev "$INTERFACE" 2>/dev/null || true
+    echo "[vpn] Health-check route: ${CHECK_HOST} → ${INTERFACE}"
+
     echo "[vpn] WireGuard interface ${INTERFACE} is up."
+    echo "[vpn] Main routes:"
+    ip route show | sed 's/^/[vpn]   /'
+    echo "[vpn] VPN table ($FW_TABLE):"
+    ip route show table "$FW_TABLE" 2>/dev/null | sed 's/^/[vpn]   /'
+    echo "[vpn] Policy rules:"
+    ip rule show | sed 's/^/[vpn]   /'
+    echo "[vpn] WireGuard status:"
+    wg show "$INTERFACE" 2>/dev/null | sed 's/^/[vpn]   /'
 }
 
 # ──────────────────────────────────────────────
@@ -154,6 +222,21 @@ start_vpn() {
 # ──────────────────────────────────────────────
 stop_vpn() {
     echo "[vpn] Stopping WireGuard interface ${INTERFACE}..."
+
+    local FW_MARK=51820
+    local FW_TABLE=51820
+
+    # Remove fwmark-based policy rules
+    ip -4 rule del not fwmark "$FW_MARK" table "$FW_TABLE" 2>/dev/null || true
+    ip -4 rule del table main suppress_prefixlength 0 2>/dev/null || true
+
+    # Flush VPN routing table
+    ip -4 route flush table "$FW_TABLE" 2>/dev/null || true
+
+    # Remove LAN policy routing
+    ip -4 rule del table 100 2>/dev/null || true
+    ip -4 route flush table 100 2>/dev/null || true
+
     ip link del "$INTERFACE" 2>/dev/null || true
 }
 
@@ -174,9 +257,26 @@ health_loop() {
                 echo "[health] VPN recovered."
                 failures=0
             fi
+            # Secondary DNS check
+            if ping -c 1 -W 5 "google.com" > /dev/null 2>&1; then
+                : # DNS OK — silent
+            else
+                echo "[health] WARN google.com unreachable — possible DNS issue"
+            fi
         else
             failures=$((failures + 1))
-            echo "[health] Ping failed ($failures/$max_failures)"
+            echo "[health] Check failed ($failures/$max_failures) — ping ${CHECK_HOST} failed"
+            # Secondary check: distinguish IP failure from DNS failure
+            if ping -c 1 -W 5 "google.com" > /dev/null 2>&1; then
+                echo "[health] INFO google.com reachable — DNS works, ${CHECK_HOST} may be filtered"
+            else
+                echo "[health] INFO google.com also unreachable — DNS or general routing failure"
+            fi
+            # Dump WireGuard stats to show if handshake is stale and how much data flows
+            echo "[health] wg stats:"
+            wg show "$INTERFACE" 2>/dev/null | grep -E 'latest handshake|transfer|endpoint' | sed 's/^/[health]   /' || echo "[health]   wg0 not found"
+            echo "[health] routes:"
+            ip route show | grep -E 'wg0|default' | sed 's/^/[health]   /'
 
             if [ "$failures" -ge "$max_failures" ]; then
                 echo "[health] VPN appears down. Restarting WireGuard..."
@@ -205,8 +305,83 @@ cleanup() {
 
 trap cleanup SIGTERM SIGINT
 
+# ──────────────────────────────────────────────
+# Startup connectivity checks — diagnose issues early
+# ──────────────────────────────────────────────
+check_vpn_connectivity() {
+    echo "[check] ── Startup connectivity checks ──"
+
+    # 1. Wait for WireGuard handshake (up to 15s)
+    local elapsed=0
+    local handshake_ts=0
+    echo "[check] Waiting for WireGuard handshake (up to 15s)..."
+    while [ "$elapsed" -lt 15 ]; do
+        handshake_ts=$(wg show "$INTERFACE" latest-handshakes 2>/dev/null | awk '{print $2}' | head -1)
+        if [ -n "$handshake_ts" ] && [ "$handshake_ts" != "0" ]; then
+            local age=$(( $(date +%s) - handshake_ts ))
+            echo "[check] OK   Handshake established ${age}s ago"
+            break
+        fi
+        sleep 1
+        elapsed=$((elapsed + 1))
+    done
+    if [ "$elapsed" -ge 15 ]; then
+        echo "[check] FAIL No WireGuard handshake after 15s — tunnel is not up"
+        echo "[check]      This container's public key (must be on the server):"
+        echo "[check]        PublicKey  = $(wg show "$INTERFACE" public-key 2>/dev/null || echo 'unknown')"
+        echo "[check]        AllowedIPs = ${VPN_ADDRESS}"
+        echo "[check]      Verify on server: wg show"
+    fi
+
+    # 2. Check whether traffic actually flows through the tunnel
+    echo "[check] Testing traffic through tunnel (ping ${CHECK_HOST})..."
+    local rx_before
+    rx_before=$(wg show "$INTERFACE" transfer 2>/dev/null | awk '{print $2}' | head -1)
+
+    if ping -c 1 -W 8 "${CHECK_HOST}" > /dev/null 2>&1; then
+        echo "[check] OK   Traffic flows — tunnel is fully working"
+    else
+        local rx_after
+        rx_after=$(wg show "$INTERFACE" transfer 2>/dev/null | awk '{print $2}' | head -1)
+        echo "[check] FAIL ping ${CHECK_HOST} unreachable through tunnel"
+
+        if [ -n "$rx_before" ] && [ -n "$rx_after" ]; then
+            if [ "$rx_after" -le "$rx_before" ]; then
+                echo "[check]      RX bytes unchanged (${rx_before} → ${rx_after})"
+                echo "[check]      Server receives packets but does NOT route them back"
+                echo "[check]      Fix on VPN server (${VPN_ENDPOINT}):"
+                echo "[check]        sysctl net.ipv4.ip_forward              # must output 1"
+                echo "[check]        iptables -t nat -L POSTROUTING -v -n    # must have MASQUERADE"
+                echo "[check]        wg show                                  # check peer + AllowedIPs"
+            else
+                echo "[check]      RX increased (${rx_before} → ${rx_after}) — tunnel passes data"
+                echo "[check]      Issue may be specific to ${CHECK_HOST} or DNS"
+            fi
+        fi
+
+        local transfer
+        transfer=$(wg show "$INTERFACE" transfer 2>/dev/null | awk '{printf "rx=%s tx=%s", $2, $3}')
+        echo "[check]      wg transfer: ${transfer}"
+    fi
+
+    # 3. DNS check
+    echo "[check] Testing DNS resolution..."
+    if nslookup 1.1.1.1 > /dev/null 2>&1 || nslookup google.com > /dev/null 2>&1; then
+        echo "[check] OK   DNS resolves"
+    else
+        echo "[check] FAIL DNS resolution failed"
+        echo "[check]      resolv.conf: $(tr '\n' ' ' < /etc/resolv.conf)"
+        echo "[check]      Check that DNS servers are reachable through wg0"
+        echo "[check] ── End of checks ──"
+        exit 1
+    fi
+
+    echo "[check] ── End of checks ──"
+}
+
 # ── Main ──
 enable_forwarding
 setup_killswitch
 start_vpn
+check_vpn_connectivity
 health_loop

Docker/nl.conf

@@ -1,17 +1,16 @@
 [Interface]
-PrivateKey = iO5spIue/6ciwUoR95hYtuxdtQxV/Q9EOoQ/jHe18kM=
-Address = 10.2.0.2/32
-DNS = 10.2.0.1
+PrivateKey = EPRa2f/v72LvIXAY4yqIRJifsSb+nCcYHqC2rwA94UI=
+Address = 100.64.244.78/32
+DNS = 198.18.0.1,198.18.0.2
 
 # Route zum VPN-Server direkt über dein lokales Netz
-PostUp = ip route add 185.183.34.149 via 192.168.178.1 dev wlp4s0f0
+PostUp = ip route add 91.148.236.64 via 192.168.178.1 dev wlp4s0f0
 PostUp = ip route add 192.168.178.0/24 via 192.168.178.1 dev wlp4s0f0
-PostDown = ip route del 185.183.34.149 via 192.168.178.1 dev wlp4s0f0
+PostDown = ip route del 91.148.236.64 via 192.168.178.1 dev wlp4s0f0
 PostDown = ip route del 192.168.178.0/24 via 192.168.178.1 dev wlp4s0f0
 
 [Peer]
-PublicKey = J4XVdtoBVc/EoI2Yk673Oes97WMnQSH5KfamZNjtM2s=
-AllowedIPs = 0.0.0.0/1, 128.0.0.0/1
-Endpoint = 185.183.34.149:51820
-
+PublicKey = KgTUh3KLijVluDvNpzDCJJfrJ7EyLzYLmdHCksG4sRg=
+AllowedIPs = 0.0.0.0/0
+Endpoint = 91.148.236.64:51820
 

Docker/podman-compose.prod.yml

@@ -0,0 +1,56 @@
+# Production compose — pulls pre-built images from Gitea registry.
+#
+# Usage:
+#   podman login git.lpl-mind.de
+#   podman-compose -f podman-compose.prod.yml pull
+#   podman-compose -f podman-compose.prod.yml up -d
+#
+# Required files:
+#   - wg0.conf  (WireGuard configuration in the same directory)
+
+services:
+  vpn:
+    image: git.lpl-mind.de/lukas.pupkalipinski/aniworld/vpn:latest
+    container_name: vpn-wireguard
+    cap_add:
+      - NET_ADMIN
+      - SYS_MODULE
+      - NET_RAW
+    sysctls:
+      - net.ipv4.ip_forward=1
+      - net.ipv4.conf.all.src_valid_mark=1
+    volumes:
+      - /server/server_aniworld/wg0.conf:/etc/wireguard/wg0.conf:ro
+      - /lib/modules:/lib/modules:ro
+    ports:
+      - "8000:8000"
+    environment:
+      - HEALTH_CHECK_INTERVAL=10
+      - HEALTH_CHECK_HOST=1.1.1.1
+      - LOCAL_PORTS=8000
+      - PUID=1013
+      - PGID=1001
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-sf", "--max-time", "5", "http://1.1.1.1"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+
+  app:
+    image: git.lpl-mind.de/lukas.pupkalipinski/aniworld/app:latest
+    container_name: aniworld-app
+    network_mode: "service:vpn"
+    depends_on:
+      vpn:
+        condition: service_healthy
+    environment:
+      - PYTHONUNBUFFERED=1
+      - PUID=1013
+      - PGID=1001
+    volumes:
+      - /server/server_aniworld/data:/app/data
+      - /server/server_aniworld/logs:/app/logs
+      - /media/serien/Serien:/data
+    restart: unless-stopped

Docker/podman-compose.yml

@@ -7,6 +7,7 @@ services:
     cap_add:
       - NET_ADMIN
       - SYS_MODULE
+      - NET_RAW
     sysctls:
       - net.ipv4.ip_forward=1
       - net.ipv4.conf.all.src_valid_mark=1

Docker/push.sh

@@ -0,0 +1,140 @@
+#!/usr/bin/env bash
+#
+# Build and push AniWorld container images to the Gitea registry.
+#
+# Usage:
+#   ./push.sh              # builds & pushes app with tag "latest"
+#   ./push.sh app          # builds & pushes app image
+#   ./push.sh vpn          # builds & pushes vpn image
+#   ./push.sh all          # builds & pushes both images
+#   ./push.sh app v1.2.3   # builds & pushes app with tag "v1.2.3"
+#   ./push.sh vpn v1.2.3   # builds & pushes vpn with tag "v1.2.3"
+#   ./push.sh all v1.2.3   # builds & pushes both images
+#   ./push.sh app v1.2.3 --no-build   # pushes existing image only
+#
+# Prerequisites:
+#   podman login git.lpl-mind.de   (or: docker login git.lpl-mind.de)
+
+set -euo pipefail
+
+# ---------------------------------------------------------------------------
+# Configuration
+# ---------------------------------------------------------------------------
+REGISTRY="git.lpl-mind.de"
+NAMESPACE="lukas.pupkalipinski"
+PROJECT="aniworld"
+
+APP_IMAGE="${REGISTRY}/${NAMESPACE}/${PROJECT}/app"
+VPN_IMAGE="${REGISTRY}/${NAMESPACE}/${PROJECT}/vpn"
+
+# Parse arguments
+TARGET="${1:-app}"
+TAG="${2:-latest}"
+SKIP_BUILD=false
+if [[ "${3:-}" == "--no-build" ]]; then
+    SKIP_BUILD=true
+fi
+
+# Validate target
+if [[ "${TARGET}" != "app" && "${TARGET}" != "vpn" && "${TARGET}" != "all" ]]; then
+    echo "ERROR: Invalid target '${TARGET}'. Must be one of: app, vpn, all" >&2
+    exit 1
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+log() { echo -e "\n>>> $*"; }
+err() { echo -e "\nERROR: $*" >&2; exit 1; }
+
+# Detect container engine (podman preferred, docker fallback)
+if command -v podman &>/dev/null; then
+    ENGINE="podman"
+elif command -v docker &>/dev/null; then
+    ENGINE="docker"
+else
+    err "Neither podman nor docker is installed."
+fi
+
+# ---------------------------------------------------------------------------
+# Pre-flight checks
+# ---------------------------------------------------------------------------
+echo "============================================"
+echo " AniWorld — Build & Push"
+echo " Engine   : ${ENGINE}"
+echo " Registry : ${REGISTRY}"
+echo " Target   : ${TARGET}"
+echo " Tag      : ${TAG}"
+echo "============================================"
+
+log "Logging in to ${REGISTRY}"
+"${ENGINE}" login "${REGISTRY}"
+
+# ---------------------------------------------------------------------------
+# Build
+# ---------------------------------------------------------------------------
+build_app() {
+    log "Building app image  →  ${APP_IMAGE}:${TAG}"
+    "${ENGINE}" build \
+        -t "${APP_IMAGE}:${TAG}" \
+        -f "${SCRIPT_DIR}/Dockerfile.app" \
+        "${PROJECT_ROOT}"
+}
+
+build_vpn() {
+    log "Building vpn image  →  ${VPN_IMAGE}:${TAG}"
+    "${ENGINE}" build \
+        -t "${VPN_IMAGE}:${TAG}" \
+        -f "${SCRIPT_DIR}/Containerfile" \
+        "${SCRIPT_DIR}"
+}
+
+if [[ "${SKIP_BUILD}" == false ]]; then
+    case "${TARGET}" in
+        app)  build_app ;;
+        vpn)  build_vpn ;;
+        all)  build_app; build_vpn ;;
+    esac
+fi
+
+# ---------------------------------------------------------------------------
+# Push
+# ---------------------------------------------------------------------------
+push_app() {
+    log "Pushing ${APP_IMAGE}:${TAG}"
+    "${ENGINE}" push "${APP_IMAGE}:${TAG}"
+}
+
+push_vpn() {
+    log "Pushing ${VPN_IMAGE}:${TAG}"
+    "${ENGINE}" push "${VPN_IMAGE}:${TAG}"
+}
+
+case "${TARGET}" in
+    app)  push_app ;;
+    vpn)  push_vpn ;;
+    all)  push_app; push_vpn ;;
+esac
+
+# ---------------------------------------------------------------------------
+# Summary
+# ---------------------------------------------------------------------------
+echo ""
+echo "============================================"
+echo "  Push complete!"
+echo ""
+echo " Images:"
+case "${TARGET}" in
+    app)  echo "   ${APP_IMAGE}:${TAG}" ;;
+    vpn)  echo "   ${VPN_IMAGE}:${TAG}" ;;
+    all)  echo "   ${APP_IMAGE}:${TAG}"; echo "   ${VPN_IMAGE}:${TAG}" ;;
+esac
+echo ""
+echo " Deploy on server:"
+echo "   ${ENGINE} login ${REGISTRY}"
+echo "   ${ENGINE} compose -f Docker/podman-compose.prod.yml pull"
+echo "   ${ENGINE} compose -f Docker/podman-compose.prod.yml up -d"
+echo "============================================"

Docker/release.sh

@@ -0,0 +1,129 @@
+#!/usr/bin/env bash
+#
+# Bump the project version and push images to the registry.
+#
+# Usage:
+#   ./release.sh
+#
+# The current version is stored in VERSION (next to this script).
+# You will be asked whether to bump major, minor, or patch.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+VERSION_FILE="${SCRIPT_DIR}/VERSION"
+
+# ---------------------------------------------------------------------------
+# Read current version
+# ---------------------------------------------------------------------------
+if [[ ! -f "${VERSION_FILE}" ]]; then
+    echo "0.0.0" > "${VERSION_FILE}"
+fi
+
+CURRENT="$(cat "${VERSION_FILE}")"
+# Strip leading 'v' for arithmetic
+VERSION="${CURRENT#v}"
+
+IFS='.' read -r MAJOR MINOR PATCH <<< "${VERSION}"
+
+echo "============================================"
+echo " AniWorld — Release"
+echo " Current version: v${MAJOR}.${MINOR}.${PATCH}"
+echo "============================================"
+echo ""
+echo "Which image(s) would you like to release?"
+echo "  1) app  (Dockerfile.app)"
+echo "  2) vpn  (Containerfile)"
+echo "  3) all  (both images)"
+echo ""
+read -rp "Enter choice [1/2/3]: " TARGET_CHOICE
+
+case "${TARGET_CHOICE}" in
+    1) TARGET="app" ;;
+    2) TARGET="vpn" ;;
+    3) TARGET="all" ;;
+    *)
+        echo "Invalid choice. Aborting." >&2
+        exit 1
+        ;;
+esac
+
+echo ""
+echo "How would you like to bump the version?"
+echo "  1) patch  (v${MAJOR}.${MINOR}.${PATCH} → v${MAJOR}.${MINOR}.$((PATCH + 1)))"
+echo "  2) minor  (v${MAJOR}.${MINOR}.${PATCH} → v${MAJOR}.$((MINOR + 1)).0)"
+echo "  3) major  (v${MAJOR}.${MINOR}.${PATCH} → v$((MAJOR + 1)).0.0)"
+echo ""
+read -rp "Enter choice [1/2/3]: " CHOICE
+
+case "${CHOICE}" in
+    1) NEW_TAG="v${MAJOR}.${MINOR}.$((PATCH + 1))" ;;
+    2) NEW_TAG="v${MAJOR}.$((MINOR + 1)).0" ;;
+    3) NEW_TAG="v$((MAJOR + 1)).0.0" ;;
+    *)
+        echo "Invalid choice. Aborting." >&2
+        exit 1
+        ;;
+esac
+
+echo ""
+echo "New version: ${NEW_TAG}"
+echo "Target: ${TARGET}"
+read -rp "Confirm? [y/N]: " CONFIRM
+if [[ ! "${CONFIRM}" =~ ^[yY]$ ]]; then
+    echo "Aborted."
+    exit 0
+fi
+
+# ---------------------------------------------------------------------------
+# Write new version
+# ---------------------------------------------------------------------------
+echo "${NEW_TAG}" > "${VERSION_FILE}"
+echo "Version file updated → ${VERSION_FILE}"
+
+# Keep root package.json in sync.
+FRONT_VERSION="${NEW_TAG#v}"
+FRONT_PKG="${SCRIPT_DIR}/../package.json"
+if [[ -f "${FRONT_PKG}" ]]; then
+    sed -i "s/\"version\": \"[^\"]*\"/\"version\": \"${FRONT_VERSION}\"/" "${FRONT_PKG}"
+    echo "package.json version updated → ${FRONT_VERSION}"
+else
+    echo "Warning: package.json not found, skipping package.json version sync" >&2
+fi
+
+# Keep root pyproject.toml in sync.
+BACKEND_PYPROJECT="${SCRIPT_DIR}/../pyproject.toml"
+if [[ -f "${BACKEND_PYPROJECT}" ]]; then
+    # Update version under [project] section if present
+    if grep -q '^\[project\]' "${BACKEND_PYPROJECT}"; then
+        sed -i "/^\[project\]/,/^\[/ s/^version = \".*\"/version = \"${FRONT_VERSION}\"/" "${BACKEND_PYPROJECT}"
+    else
+        sed -i "s/^version = \".*\"/version = \"${FRONT_VERSION}\"/" "${BACKEND_PYPROJECT}"
+    fi
+    echo "pyproject.toml version updated → ${FRONT_VERSION}"
+else
+    echo "Warning: pyproject.toml not found, skipping pyproject.toml version sync" >&2
+fi
+
+# ---------------------------------------------------------------------------
+# Push containers
+# ---------------------------------------------------------------------------
+bash "${SCRIPT_DIR}/push.sh" "${TARGET}" "${NEW_TAG}"
+bash "${SCRIPT_DIR}/push.sh" "${TARGET}"
+
+
+# ---------------------------------------------------------------------------
+# Git tag (local only; push after container build)
+# ---------------------------------------------------------------------------
+cd "${SCRIPT_DIR}/.."
+git add Docker/VERSION package.json pyproject.toml
+git commit -m "chore: bump version"
+git tag -a "${NEW_TAG}" -m "Release ${NEW_TAG}"
+echo "Local git commit + tag ${NEW_TAG} created."
+
+# ---------------------------------------------------------------------------
+# Push git commits & tag
+# ---------------------------------------------------------------------------
+git push origin HEAD
+git push origin "${NEW_TAG}"
+echo "Git commit and tag ${NEW_TAG} pushed."

Docker/test_vpn.py

@@ -6,22 +6,31 @@ Verifies:
 2. The container starts and becomes healthy.
 3. The public IP inside the VPN differs from the host IP.
 4. Kill switch blocks traffic when WireGuard is down.
+5. AllowedIPs routes are set dynamically from the config.
 
 Requirements:
     - podman installed
-    - Root/sudo (NET_ADMIN capability)
+    - Root/sudo (NET_ADMIN capability) for container runtime tests
     - A valid WireGuard config at ./wg0.conf (or ./nl.conf)
 
 Usage:
+    # Build-only test (no sudo needed):
+    python3 -m pytest test_vpn.py::TestVPNImage::test_00_build_image -v
+
+    # Full integration test (requires sudo):
     sudo python3 -m pytest test_vpn.py -v
     # or
     sudo python3 test_vpn.py
 """
 
+import logging
+import os
 import subprocess
+import sys
 import time
 import unittest
-import os
+
+logger = logging.getLogger(__name__)
 
 IMAGE_NAME = "vpn-wireguard-test"
 CONTAINER_NAME = "vpn-test-container"
@@ -32,6 +41,11 @@ STARTUP_TIMEOUT = 30  # seconds to wait for VPN to come up
 HEALTH_POLL_INTERVAL = 2  # seconds between health checks
 
 
+def is_root() -> bool:
+    """Check if running as root."""
+    return os.geteuid() == 0
+
+
 def run(cmd: list[str], timeout: int = 30, check: bool = True) -> subprocess.CompletedProcess:
     """Run a command and return the result."""
     return subprocess.run(cmd, capture_output=True, text=True, timeout=timeout, check=check)
@@ -52,6 +66,7 @@ class TestVPNImage(unittest.TestCase):
     """Test suite for the WireGuard VPN container."""
 
     host_ip: str = ""
+    container_id: str = ""
 
     @classmethod
     def setUpClass(cls):
@@ -63,23 +78,32 @@ class TestVPNImage(unittest.TestCase):
         )
 
         # ── 1. Get host public IP before VPN ──
-        print("\n[setup] Fetching host public IP...")
+        logger.info("Fetching host public IP...")
         cls.host_ip = get_host_ip()
-        print(f"[setup] Host public IP: {cls.host_ip}")
+        logger.info("Host public IP: %s", cls.host_ip)
         assert cls.host_ip, "Could not determine host public IP"
 
         # ── 2. Build the image ──
-        print(f"[setup] Building image '{IMAGE_NAME}'...")
+        logger.info("Building image '%s'...", IMAGE_NAME)
         result = run(
             ["podman", "build", "-t", IMAGE_NAME, BUILD_DIR],
             timeout=180,
         )
-        print(result.stdout[-500:] if len(result.stdout) > 500 else result.stdout)
+        logger.debug(
+            "Build output: %s",
+            result.stdout[-500:] if len(result.stdout) > 500 else result.stdout,
+        )
         assert result.returncode == 0, f"Build failed:\n{result.stderr}"
-        print("[setup] Image built successfully.")
+        logger.info("Image built successfully.")
+
+        # Skip container runtime tests if not root
+        if not is_root():
+            logger.warning("Not running as root — skipping container runtime tests.")
+            cls.container_id = ""
+            return
 
         # ── 3. Start the container ──
-        print(f"[setup] Starting container '{CONTAINER_NAME}'...")
+        logger.info("Starting container '%s'...", CONTAINER_NAME)
         result = run(
             [
                 "podman", "run", "-d",
@@ -96,7 +120,7 @@ class TestVPNImage(unittest.TestCase):
         )
         assert result.returncode == 0, f"Container failed to start:\n{result.stderr}"
         cls.container_id = result.stdout.strip()
-        print(f"[setup] Container started: {cls.container_id[:12]}")
+        logger.info("Container started: %s", cls.container_id[:12])
 
         # Verify it's running
         inspect = run(
@@ -106,17 +130,19 @@ class TestVPNImage(unittest.TestCase):
         assert inspect.stdout.strip() == "true", "Container is not running"
 
         # ── 4. Wait for VPN to come up ──
-        print(f"[setup] Waiting up to {STARTUP_TIMEOUT}s for VPN tunnel...")
+        logger.info("Waiting up to %d seconds for VPN tunnel...", STARTUP_TIMEOUT)
         vpn_up = cls._wait_for_vpn_cls(STARTUP_TIMEOUT)
         assert vpn_up, f"VPN did not come up within {STARTUP_TIMEOUT}s"
-        print("[setup] VPN tunnel is up. Running tests.\n")
+        logger.info("VPN tunnel is up. Running tests.")
 
     @classmethod
     def tearDownClass(cls):
         """Stop and remove the container."""
-        print("\n[teardown] Cleaning up...")
+        if not is_root():
+            return
+        logger.info("Cleaning up test container...")
         subprocess.run(["podman", "rm", "-f", CONTAINER_NAME], capture_output=True, check=False)
-        print("[teardown] Done.")
+        logger.info("Cleanup complete.")
 
     @classmethod
     def _wait_for_vpn_cls(cls, timeout: int = STARTUP_TIMEOUT) -> bool:
@@ -138,13 +164,25 @@ class TestVPNImage(unittest.TestCase):
         )
         return result.stdout.strip()
 
+    def _skip_if_not_root(self):
+        """Skip test if not running as root."""
+        if not is_root():
+            self.skipTest("This test requires root/sudo privileges")
+
     # ── Tests ────────────────────────────────────────────────
 
+    def test_00_build_image(self):
+        """The image builds successfully."""
+        # This is already verified in setUpClass, just confirm here
+        result = run(["podman", "images", "--format", "{{.Repository}}:{{.Tag}}"])
+        self.assertIn(IMAGE_NAME, result.stdout, "Image was not built")
+
     def test_01_ip_differs_from_host(self):
         """Public IP inside VPN is different from host IP."""
+        self._skip_if_not_root()
         vpn_ip = self._get_vpn_ip()
-        print(f"\n[test] VPN public IP:  {vpn_ip}")
-        print(f"[test] Host public IP: {self.host_ip}")
+        logger.info("VPN public IP: %s", vpn_ip)
+        logger.info("Host public IP: %s", self.host_ip)
 
         self.assertTrue(vpn_ip, "Could not fetch IP from inside the container")
         self.assertNotEqual(
@@ -155,12 +193,42 @@ class TestVPNImage(unittest.TestCase):
 
     def test_02_wireguard_interface_exists(self):
         """The wg0 interface is present in the container."""
+        self._skip_if_not_root()
         result = podman_exec(CONTAINER_NAME, ["wg", "show", "wg0"])
         self.assertEqual(result.returncode, 0, f"wg show failed:\n{result.stderr}")
         self.assertIn("peer", result.stdout.lower(), "No peer information in wg show output")
+        # AllowedIPs should be present in wg show output
+        self.assertIn("allowed ips", result.stdout.lower(), "AllowedIPs not found in wg show output")
 
-    def test_03_kill_switch_blocks_traffic(self):
+    def test_03_allowedips_routes_set(self):
+        """Routes are set dynamically based on AllowedIPs from config."""
+        self._skip_if_not_root()
+        # Check that routes exist for the AllowedIPs
+        result = podman_exec(CONTAINER_NAME, ["ip", "route", "show", "dev", "wg0"])
+        self.assertEqual(result.returncode, 0, f"ip route show failed:\n{result.stderr}")
+        # The config has AllowedIPs = 0.0.0.0/0, which should result in:
+        # 0.0.0.0/1 dev wg0 and 128.0.0.0/1 dev wg0
+        self.assertIn("0.0.0.0/1", result.stdout, "Route 0.0.0.0/1 not found")
+        self.assertIn("128.0.0.0/1", result.stdout, "Route 128.0.0.0/1 not found")
+        # Make sure there is NO default route through wg0 (Table = off should prevent this)
+        self.assertNotIn("default dev wg0", result.stdout, "Default route through wg0 found — Table = off not working!")
+        logger.info("AllowedIPs routes verified: %s", result.stdout.strip())
+
+    def test_03b_dns_configured(self):
+        """DNS is configured correctly with multiple nameserver lines."""
+        self._skip_if_not_root()
+        result = podman_exec(CONTAINER_NAME, ["cat", "/etc/resolv.conf"])
+        self.assertEqual(result.returncode, 0, f"cat /etc/resolv.conf failed:\n{result.stderr}")
+        # Should have two separate nameserver lines, not one with commas
+        self.assertIn("nameserver 198.18.0.1", result.stdout, "DNS 198.18.0.1 not found")
+        self.assertIn("nameserver 198.18.0.2", result.stdout, "DNS 198.18.0.2 not found")
+        # Make sure there are no commas in nameserver lines
+        self.assertNotIn("nameserver 198.18.0.1,198.18.0.2", result.stdout, "DNS servers written on one line with comma!")
+        logger.info("DNS config verified: %s", result.stdout.strip())
+
+    def test_04_kill_switch_blocks_traffic(self):
         """When WireGuard is down, traffic is blocked (kill switch)."""
+        self._skip_if_not_root()
         # Bring down the WireGuard interface by deleting it
         down_result = podman_exec(CONTAINER_NAME, ["ip", "link", "del", "wg0"], timeout=10)
         self.assertEqual(down_result.returncode, 0, f"ip link del wg0 failed:\n{down_result.stderr}")
@@ -178,7 +246,7 @@ class TestVPNImage(unittest.TestCase):
             result.returncode, 0,
             "Traffic went through even with WireGuard down — kill switch is NOT working!",
         )
-        print("\n[test] Kill switch confirmed: traffic blocked with VPN down")
+        logger.info("Kill switch confirmed: traffic blocked with VPN down")
 
 
 if __name__ == "__main__":

Docker/wg0.conf

@@ -1,10 +1,18 @@
 [Interface]
-PrivateKey = iO5spIue/6ciwUoR95hYtuxdtQxV/Q9EOoQ/jHe18kM=
-Address = 10.2.0.2/32
-DNS = 10.2.0.1
+PrivateKey = EPRa2f/v72LvIXAY4yqIRJifsSb+nCcYHqC2rwA94UI=
+Address = 100.64.244.78/32
+#DNS = 198.18.0.1,198.18.0.2
+DNS = 8.8.8.8
+
+# Route zum VPN-Server direkt über dein lokales Netz
+PostUp = ip route add 91.148.236.64 via 192.168.178.1 dev wlp4s0f0
+PostUp = ip route add 192.168.178.0/24 via 192.168.178.1 dev wlp4s0f0
+PostDown = ip route del 91.148.236.64 via 192.168.178.1 dev wlp4s0f0
+PostDown = ip route del 192.168.178.0/24 via 192.168.178.1 dev wlp4s0f0
 
 [Peer]
-PublicKey = J4XVdtoBVc/EoI2Yk673Oes97WMnQSH5KfamZNjtM2s=
+PublicKey = KgTUh3KLijVluDvNpzDCJJfrJ7EyLzYLmdHCksG4sRg=
 AllowedIPs = 0.0.0.0/0
-Endpoint = 185.183.34.149:51820
+Endpoint = 91.148.236.64:51820
 PersistentKeepalive = 25
+

docs/API.md

@@ -203,14 +203,14 @@ List library series that have missing episodes.
 | `page` | int | 1 | Page number (must be positive) |
 | `per_page` | int | 20 | Items per page (max 1000) |
 | `sort_by` | string | null | Sort field: `title`, `id`, `name`, `missing_episodes` |
-| `filter` | string | null | Filter: `no_episodes` (shows only series with missing episodes - episodes in DB that haven't been downloaded yet) |
+| `filter` | string | null | Filter: `missing_episodes` (shows series with any missing episodes), `no_episodes` (shows series with zero downloaded episodes) |
 
 **Filter Details:**
 
-- `no_episodes`: Returns series that have at least one episode in the database with `is_downloaded=False`
+- `missing_episodes`: Returns series that have at least one missing episode recorded in the database (`is_downloaded=False`)
+- `no_episodes`: Returns series that have missing episodes and no downloaded episodes (i.e., only missing episodes exist in the database)
 - Episodes in the database represent MISSING episodes (from episodeDict during scanning)
 - `is_downloaded=False` means the episode file was not found in the folder
-- This effectively shows series where no video files were found for missing episodes
 
 **Response (200 OK):**
 
@@ -1285,7 +1285,7 @@ Basic health check endpoint.
 {
     "status": "healthy",
     "timestamp": "2025-12-13T10:30:00.000Z",
-    "version": "1.0.0"
+    "version": "1.0.1"
 }
 ```
 
@@ -1303,7 +1303,7 @@ Comprehensive health check with database, filesystem, and system metrics.
 {
     "status": "healthy",
     "timestamp": "2025-12-13T10:30:00.000Z",
-    "version": "1.0.0",
+    "version": "1.0.1",
     "dependencies": {
         "database": {
             "status": "healthy",

docs/ARCHITECTURE.md

@@ -81,6 +81,7 @@ src/server/
 |   +-- websocket_service.py# WebSocket broadcasting
 |   +-- queue_repository.py # Database persistence
 |   +-- nfo_service.py      # NFO metadata management
+|   +-- folder_scan_service.py # Daily folder maintenance scan
 +-- models/                 # Pydantic models
 |   +-- auth.py             # Auth request/response models
 |   +-- config.py           # Configuration models
@@ -290,8 +291,9 @@ The FastAPI lifespan function (`src/server/fastapi_app.py`) runs the following s
 8. Background loader service started
 
 9. Scheduler service started
-
-10. NFO repair scan (queue incomplete tvshow.nfo files for background reload)
+   +-- Cron-based library rescans configured
+   +-- Optional: auto-download missing episodes after rescan
+   +-- Optional: folder maintenance (NFO repair, key resolution, renaming, poster checks) during scheduled runs
 ```
 
 ### 12.2 Temp Folder Guarantee

docs/CHANGELOG.md

@@ -41,6 +41,15 @@ This changelog follows [Keep a Changelog](https://keepachangelog.com/) principle
 
 ### Added
 
+- **Encoding detection for HTML parsing** (`src/core/providers/aniworld_provider.py`):
+  Added `_decode_html_content()` function that uses `chardet` to detect the actual
+  encoding of HTML content before parsing. Falls back to UTF-8 with `errors='replace'`
+  to handle pages with mismatched encoding declarations. Applied to all BeautifulSoup
+  parsing calls to prevent "Some characters could not be decoded" warnings.
+- **chardet dependency**: Added `chardet>=5.2.0` to `requirements.txt` for encoding detection.
+
+### Added
+
 - **Temp file cleanup after every download** (`src/core/providers/aniworld_provider.py`,
   `src/core/providers/enhanced_provider.py`): Module-level helper
   `_cleanup_temp_file()` removes the working temp file and any yt-dlp `.part`
@@ -73,17 +82,16 @@ This changelog follows [Keep a Changelog](https://keepachangelog.com/) principle
   that detects incomplete `tvshow.nfo` files and triggers TMDB re-fetch.
   Provides `parse_nfo_tags()`, `find_missing_tags()`, `nfo_needs_repair()`, and
   `NfoRepairService.repair_series()`. 13 required tags are checked.
-- **`perform_nfo_repair_scan()` startup hook
-  (`src/server/services/initialization_service.py`)**: New async function
-  called during application startup. Iterates every series directory, checks
-  whether `tvshow.nfo` is missing required tags using `nfo_needs_repair()`, and
-  either queues the series for background reload (when a `background_loader` is
-  provided) or calls `NfoRepairService.repair_series()` directly. Skips
-  gracefully when `tmdb_api_key` or `anime_directory` is not configured.
-- **NFO repair wired into startup lifespan (`src/server/fastapi_app.py`)**:
-  `perform_nfo_repair_scan(background_loader)` is called at the end of the
-  FastAPI lifespan startup, after `perform_media_scan_if_needed`, ensuring
-  every existing series NFO is checked and repaired on each server start.
+- **`perform_nfo_repair_scan()`
+  (`src/server/services/folder_scan_service.py`)**: New async function
+  that iterates every series directory, checks whether `tvshow.nfo` is missing
+  required tags using `nfo_needs_repair()`, and queues the series for background
+  reload via `asyncio.create_task`. Skips gracefully when `tmdb_api_key` or
+  `anime_directory` is not configured.
+- **NFO repair wired into scheduled folder scan (`src/server/services/folder_scan_service.py`)**:
+  `perform_nfo_repair_scan(background_loader=None)` is called during the
+  scheduled daily folder scan, keeping startup fast while ensuring regular
+  maintenance.
 
 ### Changed
 
@@ -131,6 +139,10 @@ This changelog follows [Keep a Changelog](https://keepachangelog.com/) principle
 - Modified `src/server/api/anime.py` to save scanned episodes to database
 - Episodes table properly tracks missing episodes with automatic cleanup
 
+### Deprecated
+
+- **Legacy Series Files (key/data)**: File-based series storage is deprecated. `key` and `data` files in anime folders will be removed in v3.0.0. Database storage is now the primary method. See [docs/MIGRATION_GUIDE.md](docs/MIGRATION_GUIDE.md) for details.
+
 ---
 
 ## Sections for Each Release

docs/CONFIGURATION.md

@@ -117,7 +117,8 @@ Location: `data/config.json`
         "interval_minutes": 60,
         "schedule_time": "03:00",
         "schedule_days": ["mon", "tue", "wed", "thu", "fri", "sat", "sun"],
-        "auto_download_after_rescan": false
+        "auto_download_after_rescan": false,
+        "folder_scan_enabled": false
     },
     "logging": {
         "level": "INFO",
@@ -143,7 +144,7 @@ Location: `data/config.json`
         "master_password_hash": "$pbkdf2-sha256$...",
         "anime_directory": "/path/to/anime"
     },
-    "version": "1.0.0"
+    "version": "1.0.1"
 }
 ```
 
@@ -173,6 +174,7 @@ Controls automatic cron-based library rescanning (powered by APScheduler).
 | `scheduler.schedule_time`              | string       | `"03:00"`                                     | Daily run time in 24-h `HH:MM` format.                               |
 | `scheduler.schedule_days`              | list[string] | `["mon","tue","wed","thu","fri","sat","sun"]` | Days of the week to run the scan. Empty list disables the cron job.  |
 | `scheduler.auto_download_after_rescan` | bool         | `false`                                       | Automatically queue missing episodes for download after each rescan. |
+| `scheduler.folder_scan_enabled`        | bool         | `false`                                       | Run folder maintenance (NFO repair, folder renaming, poster checks) during scheduled runs. **When enabled, series folders are automatically renamed to match the `<title> (<year>)` convention derived from their `tvshow.nfo` files.** |
 
 Valid day abbreviations: `mon`, `tue`, `wed`, `thu`, `fri`, `sat`, `sun`.
 
@@ -216,7 +218,9 @@ Source: [src/server/models/config.py](../src/server/models/config.py#L15-L24)
 - Obtain a TMDB API key from https://www.themoviedb.org/settings/api
 - `auto_create` creates NFO files during the download process
 - `update_on_scan` refreshes metadata when scanning existing anime
+- `download_poster` also controls whether the scheduled folder scan checks for and re-downloads missing or corrupted `poster.jpg` files (see [NFO_GUIDE.md](NFO_GUIDE.md#6-poster-check))
 - Image downloads require valid `tmdb_api_key`
+- `TMDB_API_KEY` environment variable is optional when `nfo.tmdb_api_key` is configured in `data/config.json`
 - Larger image sizes (`w780`, `original`) consume more storage space
 
 Source: [src/server/models/config.py](../src/server/models/config.py#L109-L132)

docs/DATABASE.md

@@ -83,17 +83,23 @@ Source: [src/server/database/models.py](../src/server/database/models.py), [src/
 
 ### 3.2 anime_series
 
-Stores anime series metadata.
+Stores anime series metadata. Corresponds to the core `Serie` class.
 
-| Column       | Type          | Constraints                | Description                                             |
-| ------------ | ------------- | -------------------------- | ------------------------------------------------------- |
-| `id`         | INTEGER       | PRIMARY KEY, AUTOINCREMENT | Internal database ID                                    |
-| `key`        | VARCHAR(255)  | UNIQUE, NOT NULL, INDEX    | **Primary identifier** - provider-assigned URL-safe key |
-| `name`       | VARCHAR(500)  | NOT NULL, INDEX            | Display name of the series                              |
-| `site`       | VARCHAR(500)  | NOT NULL                   | Provider site URL                                       |
-| `folder`     | VARCHAR(1000) | NOT NULL                   | Filesystem folder name (metadata only)                  |
-| `created_at` | DATETIME      | NOT NULL, DEFAULT NOW      | Record creation timestamp                               |
-| `updated_at` | DATETIME      | NOT NULL, ON UPDATE NOW    | Last update timestamp                                   |
+| Column           | Type          | Constraints                | Description                                             |
+| ---------------- | ------------- | -------------------------- | ------------------------------------------------------- |
+| `id`             | INTEGER       | PRIMARY KEY, AUTOINCREMENT | Internal database ID                                    |
+| `key`            | VARCHAR(255)  | UNIQUE, NOT NULL, INDEX    | **Primary identifier** - provider-assigned URL-safe key |
+| `name`           | VARCHAR(500)  | NOT NULL, INDEX            | Display name of the series                              |
+| `site`           | VARCHAR(500)  | NOT NULL                   | Provider site URL                                       |
+| `folder`         | VARCHAR(1000) | NOT NULL                   | Filesystem folder name (metadata only)                  |
+| `year`           | INTEGER       | NULLABLE                   | Release year of the series                               |
+| `nfo_path`       | VARCHAR(1000) | NULLABLE                   | Path to tvshow.nfo metadata file                        |
+| `tmdb_id`        | INTEGER       | NULLABLE, INDEX             | TMDB (The Movie Database) ID for metadata               |
+| `tvdb_id`        | INTEGER       | NULLABLE, INDEX             | TVDB (TheTVDB) ID for metadata                          |
+| `has_nfo`        | BOOLEAN       | NOT NULL, DEFAULT FALSE    | Whether tvshow.nfo exists                               |
+| `loading_status` | VARCHAR(50)   | NOT NULL, DEFAULT 'completed' | Status: pending, loading_episodes, loading_nfo, completed, failed |
+| `created_at`     | DATETIME      | NOT NULL, DEFAULT NOW       | Record creation timestamp                               |
+| `updated_at`     | DATETIME      | NOT NULL, ON UPDATE NOW     | Last update timestamp                                   |
 
 **Identifier Convention:**
 
@@ -101,7 +107,13 @@ Stores anime series metadata.
 - `folder` is **metadata only** for filesystem operations (e.g., `"Attack on Titan (2013)"`)
 - `id` is used only for database relationships
 
-Source: [src/server/database/models.py](../src/server/database/models.py#L23-L87)
+**EpisodeDict Mapping:**
+
+The `episodeDict` (season → episode numbers mapping) is stored as individual `Episode` records:
+- Each `Episode` has `season` and `episode_number` columns
+- Relationship: `AnimeSeries.episodes` returns all Episode records for that series
+
+Source: [src/server/database/models.py](../src/server/database/models.py#L23-L150)
 
 ### 3.3 episodes
 
@@ -441,7 +453,187 @@ items = await db.execute(
 
 ---
 
-## 12. Database Location
+## 12. Series Storage: Database vs Files (Deprecated)
+
+### File-Based Storage (Removed in v2.0)
+
+Prior to v2.0, series metadata was stored in two files per anime folder:
+
+| File     | Contents                                                |
+| -------- | ------------------------------------------------------- |
+| `key`    | Series provider key (e.g., `"attack-on-titan"`)        |
+| `data`   | JSON serialization of `Serie` object                    |
+
+File structure example:
+```
+/anime/Attack on Titan (2013)/
+├── key          # Contains: attack-on-titan
+├── data         # Contains: {"key": "...", "name": "...", "episodeDict": {...}}
+├── Season 1/
+│   └── ...
+```
+
+### Database Storage (Current)
+
+Since v2.0, all series metadata is stored in the `anime_series` table with `Episode` records for episode tracking. This provides:
+
+- **ACID transactions** for data consistency
+- **Foreign key constraints** (cascade delete)
+- **Indexed queries** for fast lookups
+- **No filesystem dependency** for metadata
+
+### Migration from Files to Database
+
+The `Serie.save_to_file()` and `Serie.load_from_file()` methods are deprecated but still functional for backward compatibility during migration:
+
+```python
+from src.core.entities.series import Serie
+
+# Old file-based loading (deprecated)
+serie = Serie.load_from_file("/anime/Attack on Titan (2013)/data")
+
+# New database-based loading
+from src.server.database.service import AnimeSeriesService
+serie = await AnimeSeriesService.get_by_key(db, "attack-on-titan")
+```
+
+### Removing File Dependencies
+
+After verifying database schema supports all fields, file-based storage can be removed:
+
+1. ✅ Schema verified: All `Serie` fields have corresponding DB columns
+2. ✅ Migration complete: All existing series migrated to database
+3. ❌ File cleanup: Remove `key` and `data` files (pending)
+
+**Note:** The `save_to_file()` and `load_from_file()` methods will be removed in v3.0.0.
+
+---
+
+## 12. Series Persistence Flow
+
+When a directory scan discovers or updates series, the scanner persists data to the database instead of writing to disk files.
+
+### Scan Flow
+
+```
+Scan Directory
+    │
+    ▼
+Find MP4 Files → Extract Serie Key
+    │
+    ▼
+Check DB for Existing Series (by key)
+    │
+    ├─── EXISTS ──────────────────────► Update Series Metadata
+    │                                        │
+    │                                        ▼
+    │                                 Sync Episodes to DB
+    │                                      │
+    │◄──────────────────────────────────────┘
+    │
+    └─── NEW ───────────────────────────► Create New Series Record
+                                             │
+                                             ▼
+                                      Create Episode Records
+                                             │
+                                             ▼
+                                      Return to Scan Loop
+```
+
+### Key Methods
+
+**SerieScanner._persist_serie_to_db()**
+- Called after `get_missing_episodes_and_season()` computes episodeDict
+- Uses `AnimeSeriesService.get_by_key()` to check if series exists
+- If exists: calls `AnimeSeriesService.update()` + `_sync_episodes_to_db()`
+- If new: calls `AnimeSeriesService.create()` + creates episodes
+
+**SerieScanner._sync_episodes_to_db()**
+- Gets existing episodes from DB via `EpisodeService.get_by_series()`
+- Compares with new episodeDict
+- Removes episodes no longer missing (unless `is_downloaded=True`)
+- Adds new missing episodes
+- Preserves `is_downloaded=True` episodes when removing missing ones
+
+**SerieList.add_to_db()**
+- Used when adding a new discovered series via API
+- Creates filesystem folder + database record + episode records
+
+### Episode Sync Logic
+
+```python
+# For each episode in DB but not in new episodeDict:
+if episode.is_downloaded:
+    # Keep - file exists, don't remove
+    pass
+else:
+    # Remove - no longer missing
+    EpisodeService.delete()
+
+# For each episode in new episodeDict but not in DB:
+# Add as new missing episode
+EpisodeService.create(is_downloaded=False)
+```
+
+### Transaction Handling
+
+- DB operations use their own session with commit/rollback
+- If DB write fails, error is logged and scan continues
+- File-based `save_to_file()` no longer called during scan
+
+### Migration Path
+
+1. v2.x: Scanner writes to both DB (primary) and files (fallback)
+2. v3.0: Scanner writes only to DB, file methods removed
+
+---
+
+## 13. Series Persistence
+
+### Schema
+
+**AnimeSeries Table**: Stores series metadata (key, name, site, folder, year)
+
+| Column    | Type         | Constraints               | Description           |
+|-----------|--------------|---------------------------|----------------------|
+| `id`      | INTEGER      | PRIMARY KEY               | Auto-increment       |
+| `key`     | VARCHAR(255) | UNIQUE, NOT NULL          | Series provider key   |
+| `name`    | VARCHAR(500) | NOT NULL                 | Display name         |
+| `site`    | VARCHAR(500) |                           | Provider site URL    |
+| `folder`  | VARCHAR(1000)|                           | Filesystem folder    |
+
+**Episode Table**: Stores per-episode metadata (season, episode_number, is_downloaded)
+
+| Column          | Type         | Constraints               | Description           |
+|-----------------|--------------|---------------------------|----------------------|
+| `id`            | INTEGER      | PRIMARY KEY               | Auto-increment       |
+| `series_id`     | INTEGER      | FOREIGN KEY → anime_series| Parent series        |
+| `season`        | INTEGER      | NOT NULL                  | Season number        |
+| `episode_number`| INTEGER      | NOT NULL                  | Episode number       |
+| `is_downloaded` | BOOLEAN      | DEFAULT FALSE            | Download status      |
+
+### Relationships
+
+- `AnimeSeries.episodes` → List of Episode objects (one-to-many)
+- `Episode.series` → Parent AnimeSeries (many-to-one)
+- Cascade delete: Deleting a series removes all its episodes
+
+### Queries
+
+```python
+# Get all series with episodes
+AnimeSeriesService.get_all(db, with_episodes=True)
+
+# Get by provider key
+AnimeSeriesService.get_by_key(db, key)
+
+# Get by folder path
+AnimeSeriesService.get_by_folder(db, folder)
+```
+
+---
+
+## 14. Database Location
 
 | Environment | Default Location                                  |
 | ----------- | ------------------------------------------------- |

docs/DEVELOPMENT.md

@@ -61,4 +61,376 @@ This document provides guidance for developers working on the Aniworld project.
     - Commit message format
     - Pull request process
 8. Common Development Tasks
+
+### Adding Queue Deduplication
+
+The download queue prevents duplicate entries at two levels:
+
+**In-Memory Deduplication** (`src/server/services/download_service.py`):
+- `_pending_by_episode` dict tracks pending episodes: key = `(serie_id, season, episode)`
+- `_add_to_pending_queue()` updates the dict when adding items
+- `add_to_queue()` checks this dict before adding episodes (includes batch-local dedup)
+- `_remove_from_pending_queue()` cleans up the dict when items are removed
+
+**Database Constraint** (`src/server/models.py`):
+- `DownloadQueueItem` has a unique index on `episode_id` via `__table_args__`
+- Prevents duplicate queue entries at the database level
+- Unique constraint: `Index("ix_download_queue_episode_pending", "episode_id", unique=True)`
+
+**Scheduler Cooldown** (`src/server/services/scheduler_service.py`):
+- `_last_auto_download_time` tracks when auto-download last ran
+- 5-minute cooldown prevents rapid re-triggers
+- Checked at start of `_auto_download_missing()`
+
+### Episode Lifecycle
+
+Episodes transition through states stored in the `episodes` table:
+
+| State | `is_downloaded` | `file_path` | Description |
+|-------|----------------|-------------|-------------|
+| Missing | `False` | `NULL` | Episode not yet downloaded |
+| Downloaded | `True` | Set | Episode exists on disk |
+
+**State Transitions:**
+1. **Missing → Downloaded**: When download completes, `_remove_episode_from_missing_list()` calls `EpisodeService.mark_downloaded()` to set `is_downloaded=True` and populate `file_path`. The episode record is NOT deleted.
+
+**Query Implications:**
+- `get_series_with_missing_episodes()`: Filters for `is_downloaded=False` to find series with undownloaded episodes
+- `get_series_with_no_episodes()`: Finds series with `is_downloaded=False` episodes but NO `is_downloaded=True` episodes (completely unwatched series)
+
+### Mocking the Download Queue
+
+When testing components that use the download queue:
+
+```python
+# Mock repository for unit tests
+class MockQueueRepository:
+    def __init__(self):
+        self._items: Dict[str, DownloadItem] = {}
+
+    async def save_item(self, item: DownloadItem) -> DownloadItem:
+        self._items[item.id] = item
+        return item
+
+    async def get_all_items(self) -> List[DownloadItem]:
+        return list(self._items.values())
+
+# Use in fixture
+@pytest.fixture
+def mock_queue_repository():
+    return MockQueueRepository()
+
+@pytest.fixture
+def download_service(mock_anime_service, mock_queue_repository):
+    return DownloadService(
+        anime_service=mock_anime_service,
+        queue_repository=mock_queue_repository,
+        max_retries=3,
+    )
+```
+
 9. Troubleshooting Development Issues
+
+### Async Context Managers for aiohttp
+
+All `aiohttp.ClientSession` usages must be wrapped in `async with`:
+
+```python
+# Correct — session properly closed on exit
+async with TMDBClient(api_key="key") as client:
+    result = await client.search_tv_show("Show")
+
+# Wrong — session may leak if exception occurs
+client = TMDBClient(api_key="key")
+result = await client.search_tv_show("Show")
+await client.close()  # May not be called if exception raised earlier
+```
+
+**Why:**
+- `aiohttp.ClientSession` holds TCP connections that must be explicitly closed
+- If exception occurs before `close()`, session leaks
+- Context manager guarantees `__aexit__` runs even on exceptions
+
+**Services that use aiohttp:**
+- `TMDBClient` — has `__aenter__`/`__aexit__`, use `async with`
+- `ImageDownloader` — has `__aenter__`/`__aexit__`, use `async with`
+- `NFOService` — wraps both above, use `async with`
+
+**Verification:**
+- Missing context manager usage triggers `__del__` warning on garbage collection
+- Integration tests verify no "Unclosed client session" errors in logs
+
+### Scheduler Persistence and Recovery
+
+The scheduler uses APScheduler's in-memory job store. Jobs are reconstructed from `config.json` on every startup — no separate database is needed.
+
+```python
+# Jobs are built from config on startup — no persistence DB required
+scheduler = AsyncIOScheduler()  # default MemoryJobStore
+scheduler.add_job(..., replace_existing=True)
+```
+
+**Startup misfire recovery:** On `start()`, the scheduler checks `system_settings.last_scan_timestamp` in `aniworld.db`. If the last scan is overdue (>23h but <25h ago), an immediate rescan is triggered. This replaces APScheduler's built-in misfire handling which required a separate SQLite database.
+
+**Grace period:** If the server was down for more than 25 hours, no automatic recovery occurs to avoid surprise rescans after long downtime.
+
+**Health endpoint:** `GET /health` returns `scheduler_next_run` and `scheduler_last_run` for external monitors (Uptime Kuma, Prometheus, etc.).
+
+**If server is down too long:** Manual trigger via `POST /api/scheduler/trigger-rescan` or wait for next scheduled run.
+
+### Database Session Management
+
+`get_async_session_factory()` returns a **new AsyncSession instance** directly (not a factory). The function name is historical — callers receive the session immediately:
+
+```python
+# Correct usage:
+db = get_async_session_factory()  # db IS the session
+await db.execute(...)
+await db.commit()
+await db.close()
+```
+
+Do NOT call the result again with `()` — that tries to call an `AsyncSession` object, causing `'AsyncSession' object is not callable`.
+
+For context manager usage, prefer `get_db_session()` (auto-commits) or `get_transactional_session()` (manual commit).
+
+### Health Check Endpoints
+
+The application provides health check endpoints for monitoring and container orchestration:
+
+#### `GET /health`
+Basic health check returning service status and startup health check results.
+
+**Response fields:**
+- `status`: "healthy", "degraded", or "unhealthy" based on startup checks
+- `timestamp`: ISO timestamp of the check
+- `series_app_initialized`: Whether the series app is loaded
+- `anime_directory_configured`: Whether anime_directory is set
+- `scheduler_next_run` / `scheduler_last_run`: Scheduler times
+- `checks`: Detailed startup check results (ffmpeg, DNS, anime_directory)
+
+#### `GET /health/ready`
+Readiness check for container orchestrators (Kubernetes, Docker Swarm).
+
+**Response when ready:**
+```json
+{
+  "status": "ready",
+  "ready": true,
+  "timestamp": "2024-01-01T00:00:00",
+  "checks": {...}
+}
+```
+
+**Response when not ready (503):**
+```json
+{
+  "status": "not_ready",
+  "ready": false,
+  "timestamp": "2024-01-01T00:00:00",
+  "critical_failures": ["anime_directory: not configured"],
+  "checks": {...}
+}
+```
+
+#### `GET /health/detailed`
+Comprehensive health check including database, filesystem, and system metrics.
+
+#### Startup Health Checks
+
+On application startup, the following checks are performed:
+
+| Check | Failure Status | Impact |
+|-------|---------------|--------|
+| `ffmpeg` | warning | HLS downloads may fail |
+| `dns_aniworld` | warning | Provider requests may fail |
+| `dns_tmdb` | warning | TMDB API calls may fail |
+| `anime_directory` | error | Download service disabled |
+
+DNS checks are warnings because failures can be transient. anime_directory errors disable the download service to prevent failures.
+
+### Troubleshooting Development Issues
+
+#### Scheduler missed a run
+
+1. Server was down at scheduled time (03:00 UTC by default).
+2. On restart, the scheduler checks `last_scan_timestamp` — if overdue by 23-25h, it triggers immediately.
+3. If server was down >25 hours, missed job is skipped to avoid surprise rescans.
+4. Trigger manually: `POST /api/scheduler/trigger-rescan`
+5. Monitor next run: `GET /health` → `scheduler_next_run`
+
+#### Scheduler not firing (no events at scheduled time)
+
+If the scheduler appears configured but never triggers:
+
+1. **Check application logs for scheduler startup:**
+   ```
+   grep "Scheduler service started" fastapi_app.log
+   ```
+   - If missing, the scheduler failed to start — check for errors above this line
+   - If present, scheduler started successfully
+
+2. **Verify the job is registered:**
+   ```
+   grep "Scheduler started with cron trigger" fastapi_app.log
+   ```
+
+3. **Verify APScheduler events in logs:**
+   ```
+   grep "apscheduler.executors.default" fastapi_app.log
+   ```
+   - `Running job` = job triggered
+   - `executed successfully` = job completed
+   - No output = job never fired
+
+4. **Test manual trigger:**
+   ```bash
+   curl -X POST http://localhost:8000/api/scheduler/trigger-rescan -H "Authorization: Bearer <token>"
+   ```
+   - If manual trigger works but cron doesn't, the issue is APScheduler configuration
+
+5. **Check next_run_time via health endpoint:**
+   ```bash
+   curl http://localhost:8000/health | jq .scheduler_next_run
+   ```
+   - If `null`, the job is not scheduled
+   - If set, the scheduler knows when to run next
+
+6. **Check timezone handling:**
+   - APScheduler uses UTC internally
+   - The schedule_time config (e.g., "03:00") is interpreted as UTC
+   - If you expect local time, adjust the schedule_time accordingly
+
+#### Startup health check failures
+
+If `/health` returns `unhealthy` status:
+
+1. **anime_directory error**: Directory not configured or not writable
+   - Check `ANIME_DIRECTORY` environment variable
+   - Verify directory exists and permissions allow write access
+   - Download service will not initialize until resolved
+
+2. **ffmpeg warning**: ffmpeg not found in PATH
+   - HLS stream downloads will fail
+   - Install ffmpeg: `apt install ffmpeg` or `brew install ffmpeg`
+
+3. **DNS warnings**: Domain resolution failed
+   - Check network connectivity
+   - DNS failures are transient — warnings don't block startup
+   - Retry later to verify: `GET /health`
+
+### Provider Failure Handling
+
+Download providers (VOE, Doodstream, Vidmoly, Vidoza, SpeedFiles, Streamtape,
+Luluvdo) regularly break: URLs expire, sites change their player markup, geo
+blocks appear, and `yt-dlp` extractors lag behind upstream changes. The
+`AniworldLoader.download()` flow is designed to fail fast and rotate.
+
+**Rotation order**
+
+1. The episode page is scraped for the providers AniWorld actually advertises.
+2. Results are ordered by the preference in `DEFAULT_PROVIDERS`
+   (`provider_config.py`); providers not listed run last.
+3. For each candidate the loader:
+   1. Calls `_check_url_alive()` — HEAD probe with GET fallback. Any 4xx
+      response or connection error skips the provider immediately.
+   2. Resolves the redirect via `_resolve_direct_link()` to obtain a direct
+      stream URL plus headers. Provider-specific extractors (e.g. `VOE`) are
+      preferred; unknown providers fall back to the embed URL so `yt-dlp` can
+      attempt extraction.
+   3. Tries `_try_direct_stream()` — straight `requests.get(stream=True)` when
+      `Content-Type` is `video/*` or `application/octet-stream`. This avoids
+      `yt-dlp` entirely for direct MP4 links.
+   4. Falls back to `yt-dlp` with the ffmpeg downloader for HLS streams.
+4. On any failure, temp files are cleaned and the loop moves to the next
+   provider. When the chain is exhausted, the loader logs
+   `All download providers failed for S{season}E{episode} ...; tried=[...]`
+   to both the application log and `logs/download_errors.log`.
+
+**Do not hardcode provider URLs.** Provider domains shift constantly (e.g.
+Doodstream alternates between `dood.li`, `dood.so`, `dood.la`). Only the
+referer hints in `PROVIDER_HEADERS` are persisted — discovery still happens
+at runtime through AniWorld's redirect endpoint.
+
+### HLS Stream Handling
+
+HLS (HTTP Live Streaming) manifests (`.m3u8`) require yt-dlp to use the
+`ffmpeg` downloader with `--hls-use-mpegts`. Both providers configure this
+automatically:
+
+```python
+ydl_opts = {
+    "downloader": "ffmpeg",     # Use ffmpeg instead of native
+    "hls_use_mpegts": True,     # Write transport stream (.ts) segments
+}
+```
+
+**Why this matters**: Without ffmpeg, yt-dlp logs:
+`"Live HLS streams are not supported by the native downloader"`
+
+**Requirements**:
+- ffmpeg must be installed and in PATH (`which ffmpeg`)
+- Install: `apt install ffmpeg` (Debian/Ubuntu) or `brew install ffmpeg` (macOS)
+- Startup health check (see Health Check Endpoints) verifies ffmpeg presence
+
+**Trade-offs**:
+- HLS downloads are slower than direct MP4 (reassembly of .ts segments)
+- Requires more disk space during download
+- May need post-processing if .ts format is not desired
+
+**Detection**: VOE provider extracts HLS URLs via `HLS_PATTERN` regex. Other
+providers let yt-dlp auto-detect from URL/content-type.
+
+### Updating yt-dlp
+
+When extractors break (typical symptoms: every provider HEAD probe succeeds
+but `yt-dlp` raises `Unable to extract` or `HTTP Error 404`):
+
+1. Check the upstream tracker first: https://github.com/yt-dlp/yt-dlp/issues
+2. Upgrade in the conda environment:
+   ```bash
+   conda run -n AniWorld pip install --upgrade yt-dlp
+   ```
+3. Smoke-test against a known-good episode before pinning a new floor in
+   `requirements.txt` (`yt-dlp>=YYYY.MM.DD`).
+4. Re-run the provider test suite:
+   ```bash
+   conda run -n AniWorld python -m pytest tests/unit/test_aniworld_provider.py -v
+   ```
+5. If a specific extractor is removed upstream, drop the provider from
+   `DEFAULT_PROVIDERS` rather than patching `yt-dlp` in tree.
+
+### User Notification on Total Failure
+
+`SeriesApp.download_episode()` already emits a `download_status="failed"`
+WebSocket event when `loader.download()` returns `False`. Operators should
+forward this to `notification_service.notify_download_failed()` so users see
+a HIGH-priority alert. The loader keeps the failure detail in
+`logs/download_errors.log` for post-mortem.
+
+## Series Storage
+
+### Overview
+
+Series metadata now stored in the database (SQLAlchemy ORM).
+Legacy files (`key` and `data` per folder) are deprecated but preserved
+for backward compatibility.
+
+### Architecture
+
+- **Database**: Single source of truth for all series metadata
+- **In-Memory Cache**: SeriesApp maintains a cache for performance
+- **Filesystem**: Only used for episode files themselves, not metadata
+
+### Migration
+
+First startup after upgrade automatically imports any legacy
+series files into the database.
+
+### Legacy Files
+
+- `key` file: Contains series provider key (deprecated)
+- `data` file: Contains Serie JSON object (deprecated)
+
+Both are safe to delete after migration; not needed for normal operation.
+

docs/InstructionsLogging.md

@@ -0,0 +1,94 @@
+# Logging Instructions
+
+This document describes how to write and refactor logging across the AniWorld codebase to make logs **human-readable**, **debug-friendly**, and **noise-free**.
+
+> ✅ Goal: Logs should help a developer understand what happened, why it happened, and what to inspect next — without overwhelming them with duplicates or irrelevant details.
+
+---
+
+## 1. Principles for Great Logs
+
+### 1.1 Use the Right Log Level
+
+- `DEBUG`: Detailed internal state useful when debugging a specific issue (e.g., decision points, returned values, request/response payloads). Not for normal operation.
+- `INFO`: High-level events that represent what the system is doing (e.g., "Import started", "New series added", "Config reloaded"). Use sparingly.
+- `WARNING`: Something unexpected happened, but the system can continue (e.g., missing optional file, fallback behavior).
+- `ERROR`: An operation failed and needs attention (e.g., exception caught, failed database write).
+- `CRITICAL`: The system is in an unusable state (e.g., config corruption, failed startup).
+
+### 1.2 Keep Logs Human-Readable
+
+- Write messages in a clear, descriptive sentence-style format.
+- Avoid cryptic codes or single-word log messages.
+- Prefer `logger.debug("... %s", value)`-style formatting over f-strings to avoid unnecessary work when the log level is disabled.
+
+### 1.3 Avoid Log Spam
+
+- Don’t log inside hot loops unless you explicitly aggregate and log a summary (e.g., "Processed 124 files, 3 failures").
+- Avoid repeated/logging the same event at the same level (e.g., do not log "Retrying" 10 times at INFO; log once at INFO and then use DEBUG for each retry).
+- Use rate limiting or debounce patterns for logs that can fire rapidly (e.g., external service health checks).
+- Prefer a single higher-level log with context rather than many low-level logs that clutter output.
+
+### 1.4 Log Objects Usefully
+
+- When logging objects, log the minimal useful representation (e.g., ID, name, status) rather than the full object or its memory address.
+- If an object has a `.dict()`, `.to_dict()`, or `.as_dict()` helper (common in Pydantic models), log that rather than relying on `repr()`.
+- Add a `__repr__` or `__str__` implementation to domain models that returns a helpful, concise string with key identifiers.
+- Use structured logging (e.g., `logger.info("Series added", extra={"series_id": series.id, "title": series.title})`) where supported.
+- For exceptions, prefer `logger.exception("Failed to ...")` to capture stack traces.
+
+---
+
+## 2. Refactoring Existing Logs
+
+When improving or refactoring existing log statements, aim to make them:
+
+- **Actionable**: A developer reading the log should know what happened and what to check next.
+- **Non-redundant**: Remove duplicates and ensure only one log records the same high-level event at a given level.
+- **Context-rich**: Include identifiers (e.g., `series_id`, `file_path`, `user_id`) and key state that explains why a decision was made.
+- **Level-appropriate**: Downgrade noisy INFO logs to DEBUG, and elevate critical failures to ERROR/CRITICAL.
+
+### 2.1 Refactor Checklist
+
+1. **Locate noisy logs**: Search for repeated messages (e.g., "Start", "Done") and determine whether they should be DEBUG or removed.
+2. **Replace ad-hoc prints**: Remove `print()` statements or `print(obj)` and replace with `logger.*` calls.
+3. **Use structured context**: If a function logs multiple related messages, include the same context in each (e.g., `extra={"series_id": series.id}`) or use a context manager that attaches it.
+4. **Validate object output**: Ensure any logged object produces a useful representation (add methods or translate to dict). If not, log the key fields explicitly.
+5. **Batch repetitive events**: If a loop logs per item, consider collecting stats and logging a summary at the end.
+
+## 3. Adding New Logs
+
+When adding logs to new code paths:
+
+- Log **important state transitions** (e.g., "Queue started", "Download completed", "Config reloaded").
+- For error paths, include what failed and why (e.g., "Could not load config from X: {exc}").
+- Prefer logging at the boundaries of operations, not deep inside utility functions unless it aids debugging.
+- Write logs in full sentences, with a clear subject, verb, and object.
+
+---
+
+## 4. Example Patterns
+
+```python
+logger.info("Import completed", extra={"series_id": series.id, "count": len(imported)})
+
+logger.debug(
+    "Fetched feed items",
+    extra={"feed_url": feed.url, "item_count": len(items)},
+)
+
+try:
+    result = download_episode(episode)
+except Exception:
+    logger.exception("Failed to download episode %s", episode.id)
+```
+
+> 💡 When in doubt, favor **fewer, richer logs** over many noisy logs.
+
+---
+
+## 5. Logging Audit Task List
+
+For a guided checklist of files and logging improvements, see **`docs/tasks.md`**. This is where we track which files have been reviewed and which logging items still need attention.
+
+> ✅ After applying the guidelines above, update `docs/tasks.md` to indicate which tasks are complete.

docs/MIGRATION_GUIDE.md

@@ -0,0 +1,111 @@
+# Migration Guide: File-Based to Database Storage
+
+## Overview
+
+This guide covers the transition from file-based series metadata storage to the new database-backed system introduced in v2.0.
+
+## What Changed
+
+**Before v2.0**: Series metadata stored in `key` and `data` files alongside anime folders.
+
+**After v2.0**: All metadata stored in SQLite database (`aniworld.db`). Files are deprecated but still supported for backward compatibility during migration.
+
+## Automated Migration
+
+The application automatically migrates on first startup:
+
+1. Scans anime directory for `key` and `data` files
+2. Parses legacy files into `AnimeSeries` and `Episode` records
+3. Loads series into in-memory cache
+4. Logs migration results
+
+**No manual action required.**
+
+## Manual Verification
+
+After first startup with the new version:
+
+1. **Check logs** for: `"Migrated X series from files to DB"`
+2. **Verify series count**: UI shows same number of series as before
+3. **Confirm episodes**: Episode counts match expected totals
+
+```bash
+# Check migration log
+grep "Migrated" logs/app.log
+
+# Verify series via API
+curl http://localhost:8000/api/anime | jq '.total'
+```
+
+## After Migration
+
+### Safe to Delete
+
+Once verified, these files can be removed:
+
+```
+<anime_folder>/
+├── Attack on Titan (2013)/
+│   ├── key     # ❌ Can delete
+│   ├── data    # ❌ Can delete
+│   └── Season 1/
+│       └── ...
+```
+
+**Deleting these files does not affect the database.** The metadata now lives in `aniworld.db`.
+
+### Backup (Recommended)
+
+Before deleting, backup the files:
+
+```bash
+# Create backup directory
+mkdir -p backup/legacy_series_files
+
+# Copy all key and data files
+find /path/to/anime -name "key" -o -name "data" | while read f; do
+    cp "$f" "backup/legacy_series_files/"
+done
+```
+
+## Reverting (Not Recommended)
+
+If you must revert to file-based storage:
+
+1. **Restore from database backup** (if available)
+2. **Export manually** (no export script exists)
+
+**Warning**: File-based storage is deprecated and will be removed in v3.0.0.
+
+## Troubleshooting
+
+### Series Not Appearing After Migration
+
+1. Check logs for migration errors: `grep -i error logs/app.log`
+2. Verify `key` and `data` files exist and are readable
+3. Manually trigger rescan: `POST /api/scheduler/trigger-rescan`
+
+### Duplicate Series
+
+1. Check for duplicate `key` files (same series in multiple folders)
+2. Verify series key uniqueness in database:
+
+```bash
+sqlite3 aniworld.db "SELECT key, COUNT(*) FROM anime_series GROUP BY key HAVING COUNT(*) > 1;"
+```
+
+### Missing Episodes
+
+1. Trigger targeted scan for affected series
+2. Check episode sync logs
+3. Verify file permissions on anime directory
+
+## Deprecation Timeline
+
+| Version | Status |
+|---------|--------|
+| v2.0.x  | Legacy files supported, migration automated |
+| v2.1.x  | Legacy files still supported, warnings in logs |
+| v3.0.0  | **Legacy files removed** - database only |
+
+Upgrade to v3.0.0 before legacy file support ends.

docs/NFO_GUIDE.md

@@ -171,6 +171,35 @@ Response:
 }
 ```
 
+### 3.6 Fallback Behavior When TMDB is Unavailable
+
+When TMDB lookup fails (network issues, API errors, or no match found), the system creates a **minimal NFO** to ensure the series is still tracked. This behavior applies to:
+
+- Manual NFO creation via API
+- Batch NFO creation operations
+- Automatic NFO creation during downloads
+
+**What a minimal NFO contains:**
+
+```xml
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<tvshow>
+    <title>Series Name</title>
+    <year>2024</year>
+    <plot>No metadata available for Series Name. TMDB lookup failed.</plot>
+</tvshow>
+```
+
+**Limitations of minimal NFOs:**
+- No poster, logo, or fanart images
+- No rating, genre, or studio information
+- No TMDB or other provider IDs
+- May not display correctly in some media servers
+
+**To upgrade a minimal NFO:**
+1. Use the Update endpoint (`PUT /api/nfo/{serie_id}/update`) when TMDB is available
+2. Or delete the NFO and recreate it with full metadata
+
 ---
 
 ## 4. File Structure
@@ -217,6 +246,7 @@ NFO files are created in the anime directory:
     <genre>Action</genre>
     <genre>Sci-Fi & Fantasy</genre>
     <uniqueid type="tmdb">1429</uniqueid>
+    <tmdbid>1429</tmdbid>
     <thumb aspect="poster">https://image.tmdb.org/t/p/w500/...</thumb>
     <fanart>
         <thumb>https://image.tmdb.org/t/p/original/...</thumb>
@@ -224,6 +254,13 @@ NFO files are created in the anime directory:
 </tvshow>
 ```
 
+**Manual TMDB ID Override**: To skip TMDB search and use a specific ID directly, include `<tmdbid>YOUR_ID</tmdbid>` in the NFO. This is useful when:
+- TMDB search fails for your series (e.g., new or obscure anime)
+- You already know the correct TMDB ID
+- You want to avoid rate limiting from repeated searches
+
+Aniworld reads `<tmdbid>` element and `<uniqueid type="tmdb">` first. If found, it uses the ID directly instead of searching.
+
 ### 4.3 Episode NFO Format
 
 ```xml
@@ -246,7 +283,84 @@ NFO files are created in the anime directory:
 
 ---
 
-## 5. API Reference
+## 5. Folder Naming Convention
+
+### 5.1 Expected Format
+
+After the daily folder scan (when **Update on library scan** is enabled), Aniworld validates every series folder against its `tvshow.nfo` metadata. If the folder name does not match the expected convention, it is automatically renamed.
+
+**Format:**
+
+```
+{title} ({year})
+```
+
+**Examples:**
+
+| NFO `<title>` | NFO `<year>` | Expected Folder Name |
+|---------------|--------------|----------------------|
+| `Attack on Titan` | `2013` | `Attack on Titan (2013)` |
+| `One Piece` | `1999` | `One Piece (1999)` |
+| `Demon Slayer: Kimetsu no Yaiba` | `2019` | `Demon Slayer Kimetsu no Yaiba (2019)` |
+
+### 5.2 Sanitization Rules
+
+Illegal filesystem characters are removed or replaced to ensure cross-platform compatibility:
+
+- Removed: `< > : " / \ | ? *` and null bytes
+- Control characters stripped
+- Multiple spaces collapsed to one
+- Leading/trailing dots and whitespace trimmed
+- Maximum length: 200 characters (truncated at word boundary if possible)
+
+### 5.3 Skip Conditions
+
+A folder is **not** renamed when any of the following apply:
+
+- `tvshow.nfo` is missing `<title>` or `<year>` (or they are empty)
+- The series has an **active or pending download**
+- The target folder name already exists (duplicate)
+- The resulting path would exceed the OS path-length limit
+- The app lacks write permission to the anime directory
+
+All skipped and renamed actions are logged.
+
+---
+
+## 6. Poster Check
+
+### 6.1 Overview
+
+During the daily folder scan, Aniworld checks every series folder for a valid `poster.jpg`. If the file is missing or smaller than 1 KB, the application attempts to re-download it from the URL stored in the series' `tvshow.nfo` file.
+
+### 6.2 How It Works
+
+1. **Scan** — After folder renaming, the scan iterates over all series folders that contain a `tvshow.nfo`.
+2. **Validate** — For each folder, it checks whether `poster.jpg` exists and is at least 1 KB.
+3. **Parse NFO** — If the poster is missing or too small, the scan reads `tvshow.nfo` and looks for a `<thumb aspect="poster">` (or any `<thumb>`) URL.
+4. **Download** — If a URL is found, the poster is downloaded using `ImageDownloader` with a concurrency limit of 3 simultaneous downloads.
+5. **Validate Download** — The downloaded image is validated with PIL to ensure it is not corrupted.
+
+### 6.3 Skip Conditions
+
+A folder is **not** processed for poster download when any of the following apply:
+
+- `tvshow.nfo` does not exist in the folder.
+- `poster.jpg` already exists and is ≥ 1 KB.
+- No `<thumb>` URL is found in the NFO (the NFO may have been created before thumb tags were added).
+- The `nfo.download_poster` setting is `false` (poster checks are still performed, but downloads are skipped if the setting is disabled; see [CONFIGURATION.md](CONFIGURATION.md)).
+
+### 6.4 Logging
+
+Every poster check action is logged:
+
+- **INFO** — When a poster is successfully downloaded.
+- **WARNING** — When a download fails or no URL is found.
+- **ERROR** — When an unexpected exception occurs during download.
+
+---
+
+## 7. API Reference
 
 ### 5.1 Check NFO Status
 
@@ -523,6 +637,36 @@ NFO files are created in the anime directory:
 4. Check network speed to TMDB servers
 5. Verify disk I/O performance
 
+### 6.7 TMDB Lookup Fails for My Series
+
+**Problem**: TMDB search fails with "No results found" for a valid series.
+
+**Solutions**:
+
+1. **Check if series exists on TMDB**: Visit https://www.themoviedb.org and search for your series
+2. **Use manual ID override**: Add TMDB ID directly to `tvshow.nfo`:
+   ```xml
+   <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+   <tvshow>
+       <title>Your Series Name</title>
+       <tmdbid>12345</tmdbid>
+       <uniqueid type="tmdb">12345</uniqueid>
+   </tvshow>
+   ```
+   Aniworld will use this ID directly instead of searching.
+
+3. **Try alternative titles**: Some anime have different titles (Japanese, romaji, English). If you have access to the folder, rename it to match the TMDB title.
+
+4. **Add to existing NFO**: If `tvshow.nfo` exists but has no TMDB ID, edit it to add:
+   ```xml
+   <tmdbid>YOUR_TMDB_ID</tmdbid>
+   ```
+   Then use the Update endpoint to refresh metadata.
+
+5. **Check for rate limiting**: If many lookups fail at once, you may be hitting TMDB rate limits. Wait and retry later.
+
+6. **Verify API key**: Ensure your TMDB API key is valid and has not exceeded usage limits.
+
 ---
 
 ## 7. Best Practices
@@ -675,21 +819,25 @@ The XML serialisation lives in `src/core/utils/nfo_generator.py`
 
 ## 11. Automatic NFO Repair
 
-Every time the server starts, Aniworld scans all existing `tvshow.nfo` files and
-automatically repairs any that are missing required tags.
+NFO repair now runs as part of the scheduled daily folder scan rather than on every
+startup.  When the scheduler triggers `FolderScanService.run_folder_scan()`, the first
+step is `perform_nfo_repair_scan(background_loader=None)`.  Each incomplete NFO is
+queued as a background `asyncio` task, so the scan returns quickly while repairs
+continue asynchronously.
 
 ### How It Works
 
 1. **Scan** — `perform_nfo_repair_scan()` in
-   `src/server/services/initialization_service.py` is called from the FastAPI
-   lifespan after `perform_media_scan_if_needed()`.
+   `src/server/services/initialization_service.py` is called from
+   `FolderScanService.run_folder_scan()` (`src/server/services/folder_scan_service.py`).
 2. **Detect** — `nfo_needs_repair(nfo_path)` from
    `src/core/services/nfo_repair_service.py` parses each `tvshow.nfo` with
    `lxml` and checks for the 13 required tags listed below.
 3. **Repair** — Series whose NFO is incomplete are queued for background reload
-   via `BackgroundLoaderService.add_series_loading_task()`. The background
-   loader re-fetches metadata from TMDB and rewrites the NFO with all tags
-   populated.
+   via `asyncio.create_task`. Each task creates its own isolated
+   :class:`NFOService` / :class:`TMDBClient` so concurrent tasks never share an
+   ``aiohttp`` session — this prevents "Connector is closed" errors when many repairs
+   run in parallel.  A semaphore caps TMDB concurrency at 3 to stay within rate limits.
 
 ### Tags Checked (13 required)
 
@@ -734,8 +882,7 @@ This calls `NFOService.update_tvshow_nfo()` directly and overwrites the existing
 | File                                            | Purpose                                                                                        |
 | ----------------------------------------------- | ---------------------------------------------------------------------------------------------- |
 | `src/core/services/nfo_repair_service.py`       | `REQUIRED_TAGS`, `parse_nfo_tags`, `find_missing_tags`, `nfo_needs_repair`, `NfoRepairService` |
-| `src/server/services/initialization_service.py` | `perform_nfo_repair_scan` startup hook                                                         |
-| `src/server/fastapi_app.py`                     | Wires `perform_nfo_repair_scan` into the lifespan                                              |
+| `src/server/services/folder_scan_service.py`    | `perform_nfo_repair_scan` — invoked during the scheduled daily folder scan                     |
 
 ---
 

docs/TESTING.md

@@ -62,6 +62,90 @@ This document describes the testing strategy, guidelines, and practices for the
     - What to mock
     - Mock patterns
     - External service mocks
+
+### Mocking the Download Queue
+
+Use `MockQueueRepository` for testing download queue functionality:
+
+```python
+from src.server.models.download import DownloadItem, EpisodeIdentifier
+
+class MockQueueRepository:
+    def __init__(self):
+        self._items: Dict[str, DownloadItem] = {}
+
+    async def save_item(self, item: DownloadItem) -> DownloadItem:
+        self._items[item.id] = item
+        return item
+
+    async def get_item(self, item_id: str) -> Optional[DownloadItem]:
+        return self._items.get(item_id)
+
+    async def get_all_items(self) -> List[DownloadItem]:
+        return list(self._items.values())
+
+    async def set_error(self, item_id: str, error: str) -> bool:
+        if item_id in self._items:
+            self._items[item_id].error = error
+            return True
+        return False
+
+    async def delete_item(self, item_id: str) -> bool:
+        if item_id in self._items:
+            del self._items[item_id]
+            return True
+        return False
+
+    async def clear_all(self) -> int:
+        count = len(self._items)
+        self._items.clear()
+        return count
+```
+
+**Key points:**
+- The mock uses in-memory storage, no database required
+- All async methods are implemented (even if just pass-through)
+- `save_item` uses `item.id` as key (must be set before calling)
+- Suitable for unit tests only (no persistence)
+
+### Mocking aiohttp Sessions
+
+When testing code that uses `aiohttp.ClientSession`:
+
+```python
+from unittest.mock import AsyncMock, MagicMock, patch
+from aiohttp import ClientSession
+
+# Mock aiohttp session for testing
+class MockAiohttpSession:
+    def __init__(self):
+        self.closed = False
+    
+    async def close(self):
+        self.closed = True
+    
+    def get(self, url, **kwargs):
+        mock_response = AsyncMock()
+        mock_response.status = 200
+        mock_response.json = AsyncMock(return_value={"data": "test"})
+        mock_response.__aenter__ = AsyncMock(return_value=mock_response)
+        mock_response.__aexit__ = AsyncMock(return_value=None)
+        return mock_response
+
+# Use in fixture
+@pytest.fixture
+async def mock_tmdb_session():
+    session = MockAiohttpSession()
+    yield session
+    # Cleanup verification
+    assert session.closed, "Session was not closed"
+```
+
+**Key points:**
+- Always verify `session.closed` is `True` after context manager exits
+- Mock `__aenter__` and `__aexit__` for response context managers
+- Set `closed = False` on mock session for unclosed warning tests
+
 7. Coverage Requirements
 8. CI/CD Integration
 9. Writing Good Tests

docs/diagrams/system-architecture.mmd

@@ -31,14 +31,16 @@ flowchart TB
 
     subgraph Core["Core Layer"]
         SeriesApp["SeriesApp"]
+        SeriesCache["SeriesCache<br/>(In-Memory)"]
         SerieScanner["SerieScanner"]
         SerieList["SerieList"]
     end
 
     subgraph Data["Data Layer"]
-        SQLite[(SQLite<br/>aniworld.db)]
+        SQLite[("SQLite<br/>aniworld.db")]
         ConfigJSON[(config.json)]
-        FileSystem[(File System<br/>Anime Directory)]
+        FileSystem[(File System<br/>Anime Episodes)]
+        LegacyFiles[("Legacy Files<br/>key/data<br/>(Deprecated)")]
     end
 
     subgraph External["External"]
@@ -71,9 +73,13 @@ flowchart TB
     AnimeService --> SQLite
 
     %% Core to Data
+    SeriesApp --> SeriesCache
+    SeriesCache -.->|Cached Series| SQLite
     SeriesApp --> SerieScanner
     SeriesApp --> SerieList
-    SerieScanner --> FileSystem
+    SerieScanner -->|Scan Episodes| FileSystem
+    SerieScanner -->|Detect Series| SQLite
+    SerieScanner -->|Migrate Legacy| LegacyFiles
     SerieScanner --> Provider
 
     %% Event flow

docs/features.md

@@ -59,6 +59,10 @@ The application now features a comprehensive configuration system that allows us
 ## Anime Management
 
 - **Anime Library Page**: Display list of anime series with missing episodes
+- **Library Filters**:
+    - "Missing Episodes Only" (shows only series with missing episodes, including series that currently have no downloaded episodes)
+    - "No Episodes" (shows series that are present in the library but have zero downloaded episodes)
+    - "Show All Series" (overrides other filters to show every series)
 - **Database-Backed Series Storage**: All series metadata and missing episodes stored in SQLite database
 - **Automatic Database Synchronization**: Series loaded from database on startup, stays in sync with filesystem
 - **Series Selection**: Select individual anime series and add episodes to download queue

docs/instructions.md

@@ -117,6 +117,3 @@ For each task completed:
 
 ---
 
-## TODO List:
-
----

docs/key

@@ -2,3 +2,50 @@ API key : 299ae8f630a31bda814263c551361448
 
 /mnt/server/serien/Serien/
 
+{
+  "name": "Aniworld",
+  "data_dir": "data",
+  "scheduler": {
+    "enabled": true,
+    "interval_minutes": 60,
+    "schedule_time": "03:00",
+    "schedule_days": [
+      "mon",
+      "tue",
+      "wed",
+      "thu",
+      "fri",
+      "sat",
+      "sun"
+    ],
+    "auto_download_after_rescan": true,
+    "folder_scan_enabled": true
+  },
+  "logging": {
+    "level": "INFO",
+    "file": null,
+    "max_bytes": null,
+    "backup_count": 3
+  },
+  "backup": {
+    "enabled": false,
+    "path": "data/backups",
+    "keep_days": 30
+  },
+  "nfo": {
+    "tmdb_api_key": "9bc3e547caff878615cbdba2cc421d37",
+    "auto_create": true,
+    "update_on_scan": true,
+    "download_poster": true,
+    "download_logo": true,
+    "download_fanart": true,
+    "image_size": "original"
+  },
+  "other": {
+    "master_password_hash": "$pbkdf2-sha256$29000$HQNASKk1xpgTAgAgJGRMaQ$73TOCCM0UEZONyNXQEPa3SmIoXeG6C1l5mMFDNgYfMQ",
+    "anime_directory": "/data"
+  },
+  "version": "1.0.0"
+}
+
+

docs/runner.csx

@@ -0,0 +1,154 @@
+#!/usr/bin/env dotnet-script
+#nullable enable
+
+using System;
+using System.IO;
+using System.Diagnostics;
+using System.Threading;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Linq;
+using System.Collections.Generic;
+
+// ── Ctrl+C: kill active process and exit cleanly ──────────────────────────────
+var cts = new CancellationTokenSource();
+Process? activeProcess = null;
+
+Console.CancelKeyPress += (_, e) =>
+{
+    e.Cancel = true;
+    Console.WriteLine("\n[runner] Interrupted — shutting down...");
+    cts.Cancel();
+    try { activeProcess?.Kill(entireProcessTree: true); } catch { }
+};
+
+// ── Paths ─────────────────────────────────────────────────────────────────────
+var repoRoot = Directory.GetCurrentDirectory();
+var tasksFile = Path.Combine(repoRoot, "Docs", "Tasks.md");
+
+if (!File.Exists(tasksFile))
+{
+    Console.Error.WriteLine($"[runner] ERROR: Tasks.md not found at {tasksFile}");
+    Console.Error.WriteLine("[runner] Run this script from the repository root.");
+    Environment.Exit(1);
+}
+
+// ── Read & split by "---" separator lines ────────────────────────────────────
+var content = File.ReadAllText(tasksFile);
+var items = Regex
+    .Split(content, @"\r?\n---\r?\n")
+    .Select(s => s.Trim())
+    .Where(s => s.Length > 0)
+    .ToList();
+
+Console.WriteLine($"[runner] Found {items.Count} section(s) in Tasks.md");
+
+// ── Helper: run copilot and stream output, return full output ─────────────────
+async Task<string> RunCopilot(IEnumerable<string> extraArgs, string prompt)
+{
+    var output = new StringBuilder();
+
+    var argList = new List<string> { "launch", "copilot", "--model", "minimax-m2.7:cloud", "--yes", "--", "--allow-all-tools" };
+    argList.AddRange(extraArgs);
+    argList.Add("-p");
+    argList.Add(prompt);
+
+    var psi = new ProcessStartInfo("ollama")
+    {
+        WorkingDirectory = repoRoot,
+        RedirectStandardOutput = true,
+        RedirectStandardError = true,
+        UseShellExecute = false,
+    };
+    foreach (var a in argList)
+        psi.ArgumentList.Add(a);
+
+    activeProcess = new Process { StartInfo = psi };
+
+    activeProcess.OutputDataReceived += (_, e) =>
+    {
+        if (e.Data is null) return;
+        Console.WriteLine(e.Data);
+        output.AppendLine(e.Data);
+    };
+    activeProcess.ErrorDataReceived += (_, e) =>
+    {
+        if (e.Data is null) return;
+        Console.Error.WriteLine(e.Data);
+        output.AppendLine(e.Data);
+    };
+
+    activeProcess.Start();
+    activeProcess.BeginOutputReadLine();
+    activeProcess.BeginErrorReadLine();
+
+    await activeProcess.WaitForExitAsync(cts.Token);
+    activeProcess = null;
+
+    return output.ToString();
+}
+
+// ── Main loop ─────────────────────────────────────────────────────────────────
+for (int i = 0; i < items.Count; i++)
+{
+    var item = items[i];
+    if (cts.IsCancellationRequested) break;
+
+    Console.WriteLine();
+    Console.WriteLine("[runner] ══════════════════════════════════════════════");
+    Console.WriteLine($"[runner] Task:\n{item}");
+    Console.WriteLine("[runner] ══════════════════════════════════════════════");
+    Console.WriteLine();
+
+    // Step 1 — run the task prompt
+    await RunCopilot(Enumerable.Empty<string>(), $"/caveman full");
+    await RunCopilot(new[] { "--continue" }, $"read ./Docs/instructions.md. {item}");
+    if (cts.IsCancellationRequested) break;
+
+    // Step 2 — confirm completion in the same chat session
+    Console.WriteLine("\n[runner] Asking for task confirmation...\n");
+    var confirmation = await RunCopilot(
+        new[] { "--continue" },
+        "are you sure tasks is done. reply with yes"
+    );
+    if (cts.IsCancellationRequested) break;
+
+    // Step 3 — check for "yes" in the reply, with retry logic for issue resolution
+    int maxRetries = 3;
+    int retryCount = 0;
+    bool taskConfirmed = confirmation.Contains("yes", StringComparison.OrdinalIgnoreCase);
+
+    while (!taskConfirmed && retryCount < maxRetries)
+    {
+        retryCount++;
+        Console.WriteLine($"\n[runner] Attempt {retryCount}/{maxRetries}: Resolving remaining issues and running tests...\n");
+
+        confirmation = await RunCopilot(
+            new[] { "--continue" },
+            "resolve any remaining issues, make sure all tests are running and pass. then confirm with yes if done"
+        );
+        if (cts.IsCancellationRequested) break;
+
+        taskConfirmed = confirmation.Contains("yes", StringComparison.OrdinalIgnoreCase);
+    }
+
+    if (!taskConfirmed)
+    {
+        Console.WriteLine($"\n[runner] Task not confirmed as done after {maxRetries} attempts. Stopping.");
+        break;
+    }
+
+    // Step 4 — commit the work
+    Console.WriteLine("\n[runner] Task confirmed. Making git commit...\n");
+
+    await RunCopilot(Enumerable.Empty<string>(), $"/caveman full");
+    await RunCopilot(new[] { "--continue" }, "make git commit");
+    if (cts.IsCancellationRequested) break;
+
+    // Step 5 — remove completed task from Tasks.md
+    var remaining = items.Skip(i + 1).ToList();
+    File.WriteAllText(tasksFile, string.Join("\n\n---\n\n", remaining));
+    Console.WriteLine("[runner] Removed completed task from Tasks.md");
+}
+
+Console.WriteLine("\n[runner] Finished.");

docs/tasks.md

@@ -0,0 +1,178 @@
+# Tasks
+
+## 1. Scheduled Folder Scan
+
+### Task 1.1: Add folder scan scheduler configuration
+
+**Where is that found**
+- `src/server/models/config.py` (`SchedulerConfig`)
+- `data/config.json` (example/default config)
+- `src/server/web/templates/setup.html` (setup UI)
+- `src/server/api/auth.py` (config save endpoint, if it validates scheduler fields)
+
+**Goal. How it should be**
+Add a new boolean field `folder_scan_enabled` (default `false`) to `SchedulerConfig`. When `true`, the scheduler will execute the folder maintenance routine during its scheduled run. Add the field to the setup page as a checkbox. Ensure existing configs without this field load successfully (Pydantic default handles this).
+
+**Possible traps and issues**
+- Backward compatibility: old `data/config.json` files must load without errors. Pydantic defaults solve this, but verify by loading an old config.
+- The setup page JavaScript must include the new field in the payload sent to `/api/config`.
+- Do not confuse this with `auto_download_after_rescan` — this is a separate toggle.
+
+**Docs changes needed**
+- `docs/CONFIGURATION.md`: Document the new `scheduler.folder_scan_enabled` option.
+- `docs/ARCHITECTURE.md`: Mention folder scan in the scheduler section.
+
+**Why this is needed**
+Users need an opt-in toggle to enable automatic daily folder maintenance (NFO repair, folder renaming, poster checks) without forcing it on everyone.
+
+---
+
+### Task 1.2: Create FolderScanService skeleton
+
+**Where is that found**
+- New file: `src/server/services/folder_scan_service.py`
+- `src/server/services/scheduler_service.py` (to call it)
+
+**Goal. How it should be**
+Create a new `FolderScanService` class with a single async entry point `async def run_folder_scan(self) -> None`. The method should:
+1. Log start/completion with structlog.
+2. Check prerequisites (`settings.anime_directory` exists, `settings.tmdb_api_key` is set).
+3. Skip gracefully with a warning log if prerequisites are missing.
+4. Use a module-level semaphore (similar to `_NFO_REPAIR_SEMAPHORE`) to limit concurrent TMDB operations to 3.
+
+Keep the implementation empty for the sub-tasks (1.3–1.5) to fill in. Just add the skeleton and the semaphore.
+
+**Possible traps and issues**
+- Circular imports: `folder_scan_service.py` will import from `initialization_service`, `config.settings`, etc. Keep imports inside methods or at the bottom if circular issues arise.
+- The service should follow the singleton pattern like `SchedulerService` and `DownloadService` if it holds state, or be stateless. For simplicity, make it a plain class instantiated per call or a module-level function set.
+- Exception handling: any unhandled exception in the scheduled task should be caught and logged so it doesn't crash the scheduler.
+
+**Docs changes needed**
+- `docs/ARCHITECTURE.md`: Add `folder_scan_service.py` to the services list.
+
+**Why this is needed**
+Encapsulates the new daily maintenance logic in its own module, keeping `scheduler_service.py` clean and allowing the folder scan to be tested independently.
+
+---
+
+### Task 1.3: Integrate NFO repair into folder scan
+
+**Where is that found**
+- `src/server/services/folder_scan_service.py`
+- `src/server/services/initialization_service.py` (`perform_nfo_repair_scan`)
+
+**Goal. How it should be**
+Inside `FolderScanService.run_folder_scan()`, call `perform_nfo_repair_scan(background_loader=None)` as the first step. Reuse the existing function exactly — do not copy its logic. Log a message before and after the call.
+
+**Possible traps and issues**
+- `perform_nfo_repair_scan` spawns `asyncio.create_task` for each repair. When called from the scheduler, these background tasks will still run after `run_folder_scan` returns. This is fine, but log that repairs are queued.
+- The function already handles missing `tmdb_api_key` and `anime_directory`, so the caller doesn't need to double-check, but the skeleton from Task 1.2 already checks prerequisites.
+- `perform_nfo_repair_scan` imports `nfo_needs_repair` and `NfoRepairService` inside the function, so no heavy import-time dependencies.
+
+**Docs changes needed**
+- `docs/NFO_GUIDE.md`: Update the "Automatic NFO Repair" section to state that repair now runs as part of the scheduled folder scan instead of every startup.
+
+**Why this is needed**
+Reuses the existing, tested NFO repair logic. Moves NFO repair from startup blocking to scheduled background maintenance.
+
+---
+
+### Task 1.4: Validate and rename series folders
+
+**Where is that found**
+- `src/server/services/folder_scan_service.py`
+- `src/core/services/nfo_repair_service.py` (for `parse_nfo_tags` or similar NFO parsing)
+- `src/server/database/models.py` / `src/server/database/system_settings_service.py` (if folder paths are stored in DB)
+
+**Goal. How it should be**
+After NFO repair, iterate over every subfolder in `settings.anime_directory` that contains a `tvshow.nfo`. For each folder:
+1. Parse the NFO to extract `<title>` and `<year>` text values.
+2. Compute the expected folder name: `f"{title} ({year})"`.
+3. Sanitize the expected name for filesystem safety (remove/replace illegal characters like `/`, `\`, `:`, etc.).
+4. Compare with the current folder name (`series_dir.name`).
+5. If different, rename the folder using `series_dir.rename(expected_path)`.
+6. If the series path is stored in the database (check `anime_service` or DB models), update the database record to point to the new path.
+
+Skip folders where title or year is missing/empty. Log every rename action.
+
+**Possible traps and issues**
+- **Database path consistency**: If `Series` or `Episode` models store absolute or relative paths, renaming the folder on disk without updating the DB will break downloads, NFO updates, and the web UI. Must verify whether paths are stored in the DB and update them.
+- **Active downloads**: A series currently being downloaded should not be renamed. Check the download queue or lock status before renaming. If no lock mechanism exists, this is a major trap — document it.
+- **Filesystem permissions**: The app may not have write permission to the anime directory. Catch `PermissionError` and `OSError` and log gracefully.
+- **Special characters**: Titles like `"A / B"` or `"Show: Subtitle"` contain characters illegal in folder names. Define a sanitization function (e.g., replace `/` with `-`, remove trailing dots on Windows, etc.).
+- **Duplicate names**: Two different series could sanitize to the same name. Check if target path already exists before renaming.
+- **Path length limits**: Very long titles might exceed OS path limits.
+
+**Docs changes needed**
+- `docs/NFO_GUIDE.md`: Add a section "Folder Naming Convention" explaining the `<title> (<year>)` format.
+- `docs/CONFIGURATION.md`: Mention that enabling folder scan will rename folders.
+
+**Why this is needed**
+Enforces a consistent, predictable folder naming scheme across the library, making it easier for media center apps (Kodi, Jellyfin, Plex) to match metadata.
+
+---
+
+### Task 1.5: Check and download missing poster.jpg
+
+**Where is that found**
+- `src/server/services/folder_scan_service.py`
+- `src/core/utils/image_downloader.py` (`ImageDownloader`)
+- `src/core/services/nfo_service.py` or `src/core/services/nfo_repair_service.py` (to get poster URL from NFO or TMDB)
+
+**Goal. How it should be**
+After folder renaming, iterate over series folders again (or combine with Task 1.4 loop). For each folder:
+1. Check if `poster.jpg` exists and has a size ≥ `ImageDownloader.min_file_size` (1 KB by default).
+2. If missing or too small:
+   a. Parse `tvshow.nfo` for `<thumb aspect="poster">` or `<thumb>` URL.
+   b. If no URL in NFO, skip (do not query TMDB again to keep tasks small; the NFO should already have it after repair).
+   c. Use `ImageDownloader` (with context manager) to download the image to `series_dir / "poster.jpg"`.
+   d. Validate the downloaded image with `ImageDownloader._validate_image` (or similar existing validation).
+3. Use the existing `_NFO_REPAIR_SEMAPHORE` or a new `POSTER_DOWNLOAD_SEMAPHORE` to limit concurrent downloads to 3.
+
+**Possible traps and issues**
+- **TMDB rate limiting**: Even downloading images hits TMDB CDN. The semaphore limits concurrency.
+- **Invalid images**: A download might produce a 0-byte or corrupted file. `ImageDownloader` already validates with PIL; reuse that.
+- **NFO without thumb URL**: If the NFO was created before thumb tags were added, there may be no URL. In that case, skip and log. A future task could query TMDB directly.
+- **Write permissions**: Same as Task 1.4.
+- **Async session sharing**: `ImageDownloader` manages its own `aiohttp` session. Use `async with ImageDownloader() as downloader:` to ensure cleanup.
+
+**Docs changes needed**
+- `docs/NFO_GUIDE.md`: Add "Poster Check" subsection under folder scan.
+- `docs/CONFIGURATION.md`: Mention that `nfo.download_poster` setting also affects scheduled poster checks.
+
+**Why this is needed**
+Ensures every series has artwork, which is required by most media center front-ends for a polished library view.
+
+---
+
+## 2. Remove startup NFO repair
+
+### Task 2.1: Remove perform_nfo_repair_scan from startup lifespan
+
+**Where is that found**
+- `src/server/fastapi_app.py` (lifespan startup block, lines ~245 and ~319)
+- `src/server/services/initialization_service.py` (keep the function, just remove the call site)
+- `tests/integration/test_nfo_repair_startup.py`
+- `tests/unit/test_initialization_service.py` (tests that call `perform_nfo_repair_scan` directly can stay, but integration tests verifying startup wiring must change)
+
+**Goal. How it should be**
+1. In `src/server/fastapi_app.py`, remove the import of `perform_nfo_repair_scan` from the `initialization_service` import block.
+2. Remove the line `await perform_nfo_repair_scan(background_loader)` from the lifespan startup sequence.
+3. Update `tests/integration/test_nfo_repair_startup.py`:
+   - Remove or modify `test_perform_nfo_repair_scan_imported_in_lifespan` and `test_perform_nfo_repair_scan_called_after_media_scan` since the startup wiring is gone.
+   - Replace with a test that verifies `perform_nfo_repair_scan` is NOT called during startup (or simply delete the file if it has no other purpose).
+4. `tests/unit/test_initialization_service.py` tests for `perform_nfo_repair_scan` can remain because they test the function itself, not the startup wiring.
+
+**Possible traps and issues**
+- **Test failures**: `test_nfo_repair_startup.py` will fail immediately after the code change. It must be updated in the same PR.
+- **Documentation drift**: `docs/NFO_GUIDE.md`, `docs/CHANGELOG.md`, and `docs/ARCHITECTURE.md` all describe the startup NFO repair behavior. If docs are not updated, users will expect repair on every start.
+- **Background loader parameter**: The `background_loader` variable was created partly for `perform_nfo_repair_scan`. After removal, check if `background_loader` is still needed for other startup steps (yes — `perform_media_scan_if_needed` uses it). Do not remove `background_loader` entirely.
+- **Import cleanup**: Ensure no unused imports remain in `fastapi_app.py` after removal.
+
+**Docs changes needed**
+- `docs/NFO_GUIDE.md`: Update section 11 "Automatic NFO Repair" to remove startup references and state it runs via scheduler.
+- `docs/CHANGELOG.md`: Add an entry under "Changed" or "Removed" noting that startup NFO repair is replaced by scheduled folder scan.
+- `docs/ARCHITECTURE.md`: Update the startup sequence description.
+
+**Why this is needed**
+Running `perform_nfo_repair_scan` on every startup slows down server restarts, especially for large libraries. Moving it to a scheduled task keeps startup fast while still ensuring regular maintenance.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aniworld-web",
-  "version": "1.0.0",
+  "version": "1.3.6",
   "description": "Aniworld Anime Download Manager - Web Frontend",
   "type": "module",
   "scripts": {

requirements.txt

@@ -18,4 +18,11 @@ aiosqlite>=0.19.0
 aiohttp>=3.9.0
 lxml>=5.0.0
 pillow>=10.0.0
-APScheduler>=3.10.4
+APScheduler>=3.10.4
+Events>=0.5
+requests>=2.31.0
+beautifulsoup4>=4.12.0
+chardet>=5.2.0
+fake-useragent>=1.4.0
+yt-dlp>=2024.1.0
+urllib3>=2.0.0

src/cli/nfo_cli.py

@@ -5,6 +5,7 @@ and checking NFO metadata files.
 """
 
 import asyncio
+import logging
 import sys
 from pathlib import Path
 
@@ -14,48 +15,50 @@ sys.path.insert(0, str(Path(__file__).parent.parent.parent))
 from src.config.settings import settings
 from src.core.services.series_manager_service import SeriesManagerService
 
+logger = logging.getLogger(__name__)
+
 
 async def scan_and_create_nfo():
     """Scan all series and create missing NFO files."""
-    print("=" * 70)
-    print("NFO Auto-Creation Tool")
-    print("=" * 70)
-    
+    logger.info("%s", "=" * 70)
+    logger.info("NFO Auto-Creation Tool")
+    logger.info("%s", "=" * 70)
+
     if not settings.tmdb_api_key:
-        print("\n❌ Error: TMDB_API_KEY not configured")
-        print("   Set TMDB_API_KEY in .env file or environment")
-        print("   Get API key from: https://www.themoviedb.org/settings/api")
+        logger.error("TMDB_API_KEY not configured")
+        logger.error("Set TMDB_API_KEY in .env file or environment")
+        logger.error("Get API key from: https://www.themoviedb.org/settings/api")
         return 1
     
     if not settings.anime_directory:
-        print("\n❌ Error: ANIME_DIRECTORY not configured")
+        logger.error("ANIME_DIRECTORY not configured")
         return 1
-    
-    print(f"\nAnime Directory: {settings.anime_directory}")
-    print(f"Auto-create NFO: {settings.nfo_auto_create}")
-    print(f"Update on scan: {settings.nfo_update_on_scan}")
-    print(f"Download poster: {settings.nfo_download_poster}")
-    print(f"Download logo: {settings.nfo_download_logo}")
-    print(f"Download fanart: {settings.nfo_download_fanart}")
-    
+
+    logger.info("Anime Directory: %s", settings.anime_directory)
+    logger.info("Auto-create NFO: %s", settings.nfo_auto_create)
+    logger.info("Update on scan: %s", settings.nfo_update_on_scan)
+    logger.info("Download poster: %s", settings.nfo_download_poster)
+    logger.info("Download logo: %s", settings.nfo_download_logo)
+    logger.info("Download fanart: %s", settings.nfo_download_fanart)
+
     if not settings.nfo_auto_create:
-        print("\n⚠️  Warning: NFO_AUTO_CREATE is set to False")
-        print("   Enable it in .env to auto-create NFO files")
-        print("\n   Continuing anyway to demonstrate functionality...")
+        logger.warning("NFO_AUTO_CREATE is set to False")
+        logger.warning("Enable it in .env to auto-create NFO files")
+        logger.info("Continuing anyway to demonstrate functionality...")
         # Override for demonstration
         settings.nfo_auto_create = True
     
-    print("\nInitializing series manager...")
+    logger.info("Initializing series manager...")
     manager = SeriesManagerService.from_settings()
-    
+
     # Get series list first
     serie_list = manager.get_serie_list()
     all_series = serie_list.get_all()
-    
-    print(f"Found {len(all_series)} series in directory")
-    
+
+    logger.info("Found %d series in directory", len(all_series))
+
     if not all_series:
-        print("\n⚠️  No series found. Add some anime series first.")
+        logger.warning("No series found. Add some anime series first.")
         return 0
     
     # Show series without NFO
@@ -65,25 +68,25 @@ async def scan_and_create_nfo():
             series_without_nfo.append(serie)
     
     if series_without_nfo:
-        print(f"\nSeries without NFO: {len(series_without_nfo)}")
+        logger.info("Series without NFO: %d", len(series_without_nfo))
         for serie in series_without_nfo[:5]:  # Show first 5
-            print(f"  - {serie.name} ({serie.folder})")
+            logger.debug("Missing NFO: %s (%s)", serie.name, serie.folder)
         if len(series_without_nfo) > 5:
-            print(f"  ... and {len(series_without_nfo) - 5} more")
+            logger.info("... and %d more", len(series_without_nfo) - 5)
     else:
-        print("\n✅ All series already have NFO files!")
-        
+        logger.info("All series already have NFO files")
+
         if not settings.nfo_update_on_scan:
-            print("\nNothing to do. Enable NFO_UPDATE_ON_SCAN to update existing NFOs.")
+            logger.info("Nothing to do. Enable NFO_UPDATE_ON_SCAN to update existing NFOs.")
             return 0
     
-    print("\nProcessing NFO files...")
-    print("(This may take a while depending on the number of series)")
-    
+    logger.info("Processing NFO files...")
+    logger.info("This may take a while depending on the number of series")
+
     try:
         await manager.scan_and_process_nfo()
-        print("\n✅ NFO processing complete!")
-        
+        logger.info("NFO processing complete")
+
         # Show updated stats
         serie_list.load_series()  # Reload to get updated stats
         all_series = serie_list.get_all()
@@ -91,17 +94,17 @@ async def scan_and_create_nfo():
         series_with_poster = [s for s in all_series if s.has_poster()]
         series_with_logo = [s for s in all_series if s.has_logo()]
         series_with_fanart = [s for s in all_series if s.has_fanart()]
-        
-        print("\nFinal Statistics:")
-        print(f"  Series with NFO:    {len(series_with_nfo)}/{len(all_series)}")
-        print(f"  Series with poster: {len(series_with_poster)}/{len(all_series)}")
-        print(f"  Series with logo:   {len(series_with_logo)}/{len(all_series)}")
-        print(f"  Series with fanart: {len(series_with_fanart)}/{len(all_series)}")
-        
-    except Exception as e:
-        print(f"\n❌ Error: {e}")
-        import traceback
-        traceback.print_exc()
+
+        logger.info("Final statistics", extra={
+            "total_series": len(all_series),
+            "with_nfo": len(series_with_nfo),
+            "with_poster": len(series_with_poster),
+            "with_logo": len(series_with_logo),
+            "with_fanart": len(series_with_fanart),
+        })
+
+    except Exception:
+        logger.exception("Failed to process NFO files")
         return 1
     finally:
         await manager.close()
@@ -111,78 +114,92 @@ async def scan_and_create_nfo():
 
 async def check_nfo_status():
     """Check NFO status for all series."""
-    print("=" * 70)
-    print("NFO Status Check")
-    print("=" * 70)
-    
+    logger.info("%s", "=" * 70)
+    logger.info("NFO Status Check")
+    logger.info("%s", "=" * 70)
+
     if not settings.anime_directory:
-        print("\n❌ Error: ANIME_DIRECTORY not configured")
+        logger.error("ANIME_DIRECTORY not configured")
         return 1
-    
-    print(f"\nAnime Directory: {settings.anime_directory}")
-    
+
+    logger.info("Anime Directory: %s", settings.anime_directory)
+
     # Create series list (no NFO service needed for status check)
     from src.core.entities.SerieList import SerieList
     serie_list = SerieList(settings.anime_directory)
     all_series = serie_list.get_all()
-    
+
     if not all_series:
-        print("\n⚠️  No series found")
+        logger.warning("No series found")
         return 0
-    
-    print(f"\nTotal series: {len(all_series)}")
-    
+
+    logger.info("Total series: %d", len(all_series))
+
     # Categorize series
     with_nfo = []
     without_nfo = []
-    
+
     for serie in all_series:
         if serie.has_nfo():
             with_nfo.append(serie)
         else:
             without_nfo.append(serie)
-    
-    print(f"\nWith NFO:    {len(with_nfo)} ({len(with_nfo) * 100 // len(all_series)}%)")
-    print(f"Without NFO: {len(without_nfo)} ({len(without_nfo) * 100 // len(all_series)}%)")
-    
+
+    logger.info(
+        "Series NFO coverage",
+        extra={
+            "with_nfo": len(with_nfo),
+            "without_nfo": len(without_nfo),
+            "total": len(all_series),
+        },
+    )
+
     if without_nfo:
-        print("\nSeries missing NFO:")
+        logger.info("Series missing NFO: %d", len(without_nfo))
         for serie in without_nfo[:10]:
-            print(f"  ❌ {serie.name} ({serie.folder})")
+            logger.debug("Missing NFO: %s (%s)", serie.name, serie.folder)
         if len(without_nfo) > 10:
-            print(f"  ... and {len(without_nfo) - 10} more")
-    
+            logger.info("... and %d more", len(without_nfo) - 10)
+
     # Media file statistics
     with_poster = sum(1 for s in all_series if s.has_poster())
     with_logo = sum(1 for s in all_series if s.has_logo())
     with_fanart = sum(1 for s in all_series if s.has_fanart())
-    
-    print("\nMedia Files:")
-    print(f"  Posters: {with_poster}/{len(all_series)} ({with_poster * 100 // len(all_series)}%)")
-    print(f"  Logos:   {with_logo}/{len(all_series)} ({with_logo * 100 // len(all_series)}%)")
-    print(f"  Fanart:  {with_fanart}/{len(all_series)} ({with_fanart * 100 // len(all_series)}%)")
-    
+
+    logger.info(
+        "Media file coverage",
+        extra={
+            "posters": with_poster,
+            "logos": with_logo,
+            "fanart": with_fanart,
+            "total": len(all_series),
+        },
+    )
+
     return 0
 
 
 async def update_nfo_files():
     """Update existing NFO files with fresh data from TMDB."""
-    print("=" * 70)
-    print("NFO Update Tool")
-    print("=" * 70)
-    
+    logger.info("%s", "=" * 70)
+    logger.info("NFO Update Tool")
+    logger.info("%s", "=" * 70)
+
     if not settings.tmdb_api_key:
-        print("\n❌ Error: TMDB_API_KEY not configured")
-        print("   Set TMDB_API_KEY in .env file or environment")
-        print("   Get API key from: https://www.themoviedb.org/settings/api")
+        logger.error("TMDB_API_KEY not configured")
+        logger.error("Set TMDB_API_KEY in .env file or environment")
+        logger.error("Get API key from: https://www.themoviedb.org/settings/api")
         return 1
-    
+
     if not settings.anime_directory:
-        print("\n❌ Error: ANIME_DIRECTORY not configured")
+        logger.error("ANIME_DIRECTORY not configured")
         return 1
-    
-    print(f"\nAnime Directory: {settings.anime_directory}")
-    print(f"Download media: {settings.nfo_download_poster or settings.nfo_download_logo or settings.nfo_download_fanart}")
+
+    logger.info("Anime Directory: %s", settings.anime_directory)
+    logger.info(
+        "Download media: %s",
+        settings.nfo_download_poster or settings.nfo_download_logo or settings.nfo_download_fanart,
+    )
     
     # Get series with NFO
     from src.core.entities.SerieList import SerieList
@@ -191,57 +208,55 @@ async def update_nfo_files():
     series_with_nfo = [s for s in all_series if s.has_nfo()]
     
     if not series_with_nfo:
-        print("\n⚠️  No series with NFO files found")
-        print("   Run 'scan' command first to create NFO files")
+        logger.warning("No series with NFO files found")
+        logger.info("Run 'scan' command first to create NFO files")
         return 0
-    
-    print(f"\nFound {len(series_with_nfo)} series with NFO files")
-    print("Updating NFO files with fresh data from TMDB...")
-    print("(This may take a while)")
-    
+
+    logger.info("Found %d series with NFO files", len(series_with_nfo))
+    logger.info("Updating NFO files with fresh data from TMDB...")
+    logger.info("This may take a while")
+
     # Initialize NFO service using factory
     from src.core.services.nfo_factory import create_nfo_service
     try:
         nfo_service = create_nfo_service()
     except ValueError as e:
-        print(f"\nError: {e}")
+        logger.error("Error creating NFO service: %s", e)
         return 1
-    
+
     success_count = 0
     error_count = 0
-    
+
     try:
         for i, serie in enumerate(series_with_nfo, 1):
-            print(f"\n[{i}/{len(series_with_nfo)}] Updating: {serie.name}")
-            
+            logger.info("[%d/%d] Updating: %s", i, len(series_with_nfo), serie.name)
+
             try:
                 await nfo_service.update_tvshow_nfo(
                     serie_folder=serie.folder,
                     download_media=(
-                        settings.nfo_download_poster or 
-                        settings.nfo_download_logo or 
+                        settings.nfo_download_poster or
+                        settings.nfo_download_logo or
                         settings.nfo_download_fanart
-                    )
+                    ),
                 )
-                print(f"  ✅ Updated successfully")
+                logger.info("Updated successfully: %s", serie.name)
                 success_count += 1
-                
+
                 # Small delay to respect API rate limits
                 await asyncio.sleep(0.5)
-                
+
             except Exception as e:
-                print(f"  ❌ Error: {e}")
+                logger.exception("Failed to update NFO for %s", serie.name)
                 error_count += 1
-        
-        print("\n" + "=" * 70)
-        print(f"✅ Update complete!")
-        print(f"  Success: {success_count}")
-        print(f"  Errors:  {error_count}")
-        
-    except Exception as e:
-        print(f"\n❌ Fatal error: {e}")
-        import traceback
-        traceback.print_exc()
+
+        logger.info("%s", "=" * 70)
+        logger.info("Update complete")
+        logger.info("Success: %d", success_count)
+        logger.info("Errors: %d", error_count)
+
+    except Exception:
+        logger.exception("Fatal error during NFO update")
         return 1
     finally:
         await nfo_service.close()
@@ -251,20 +266,22 @@ async def update_nfo_files():
 
 def main():
     """Main CLI entry point."""
+    logging.basicConfig(level=logging.INFO, format="%(message)s")
+
     if len(sys.argv) < 2:
-        print("NFO Management Tool")
-        print("\nUsage:")
-        print("  python -m src.cli.nfo_cli scan     # Scan and create missing NFO files")
-        print("  python -m src.cli.nfo_cli status   # Check NFO status for all series")
-        print("  python -m src.cli.nfo_cli update   # Update existing NFO files with fresh data")
-        print("\nConfiguration:")
-        print("  Set TMDB_API_KEY in .env file")
-        print("  Set NFO_AUTO_CREATE=true to enable auto-creation")
-        print("  Set NFO_UPDATE_ON_SCAN=true to update existing NFOs during scan")
+        logger.info("NFO Management Tool")
+        logger.info("\nUsage:")
+        logger.info("  python -m src.cli.nfo_cli scan     # Scan and create missing NFO files")
+        logger.info("  python -m src.cli.nfo_cli status   # Check NFO status for all series")
+        logger.info("  python -m src.cli.nfo_cli update   # Update existing NFO files with fresh data")
+        logger.info("\nConfiguration:")
+        logger.info("  Set TMDB_API_KEY in .env file")
+        logger.info("  Set NFO_AUTO_CREATE=true to enable auto-creation")
+        logger.info("  Set NFO_UPDATE_ON_SCAN=true to update existing NFOs during scan")
         return 1
-    
+
     command = sys.argv[1].lower()
-    
+
     if command == "scan":
         return asyncio.run(scan_and_create_nfo())
     elif command == "status":
@@ -272,8 +289,8 @@ def main():
     elif command == "update":
         return asyncio.run(update_nfo_files())
     else:
-        print(f"Unknown command: {command}")
-        print("Use 'scan', 'status', or 'update'")
+        logger.error("Unknown command: %s", command)
+        logger.info("Use 'scan', 'status', or 'update'")
         return 1
 
 

src/config/settings.py

@@ -1,3 +1,4 @@
+import re
 import secrets
 from typing import Optional
 
@@ -114,6 +115,40 @@ class Settings(BaseSettings):
         validation_alias="NFO_PREFER_FSK_RATING",
         description="Prefer German FSK rating over MPAA rating in NFO files"
     )
+    nfo_folder_ignore_patterns: str = Field(
+        default="The Last of Us|Loki|Chernobyl|Star Trek Discovery|Marvel|Matrix|Fast & Furious|Jurassic|James Bond|Mission: Impossible|Bourne|Hunger Games|Die Hard|John Wick|Pacific Rim|Guardians of the Galaxy|Avengers|Batman|Superman|Wonder Woman|Spider-Man|X-Men|Fantastic Four|Terminator|Predator|Rambo|Rocky|Expendables|Tomb Raider|Jumanji|Jurassic Park|Pirates of the Caribbean|Harry Potter|Lord of the Rings|Hobbit|Game of Thrones|Westworld|Stranger Things|Breaking Bad|Better Call Saul|Sherlock|Downton Abbey|The Crown|Bridgerton|Sex Education|Normal People|Emily in Paris|The Witcher|Servant|Lucifer|Dark|Shadow and Bone|Grimm|Fairytale",
+        validation_alias="NFO_FOLDER_IGNORE_PATTERNS",
+        description="Regex patterns for folder names to skip during scan (pipe-separated)"
+    )
+
+    @property
+    def folder_ignore_patterns(self) -> list[str]:
+        """Parse ignore patterns from comma-separated string into list.
+
+        Returns:
+            List of regex patterns to skip during folder scanning.
+        """
+        if not self.nfo_folder_ignore_patterns:
+            return []
+        return [
+            pattern.strip()
+            for pattern in self.nfo_folder_ignore_patterns.split("|")
+            if pattern.strip()
+        ]
+
+    def should_ignore_folder(self, folder_name: str) -> bool:
+        """Check if folder should be ignored based on ignore patterns.
+
+        Args:
+            folder_name: Name of folder to check.
+
+        Returns:
+            True if folder matches any ignore pattern, False otherwise.
+        """
+        for pattern in self.folder_ignore_patterns:
+            if re.search(pattern, folder_name, re.IGNORECASE):
+                return True
+        return False
 
     @property
     def allowed_origins(self) -> list[str]:
@@ -134,5 +169,23 @@ class Settings(BaseSettings):
             ]
         return [origin.strip() for origin in raw.split(",") if origin.strip()]
 
+    @property
+    def scan_key_overrides(self) -> dict[str, str]:
+        """Return scan key overrides from config.json.
+        
+        Maps folder names to provider keys for cases where auto-generated
+        keys from folder names are incorrect.
+        
+        Returns:
+            Dict mapping folder names to provider keys.
+        """
+        from src.server.services.config_service import ConfigService
+        try:
+            config_service = ConfigService()
+            config = config_service.load_config()
+            return config.scan_key_overrides or {}
+        except Exception:
+            return {}
+
 
 settings = Settings()

src/core/SeriesApp.py

@@ -14,7 +14,7 @@ import asyncio
 import logging
 import os
 from concurrent.futures import ThreadPoolExecutor
-from typing import Any, Dict, List, Optional
+from typing import Any, Callable, Dict, List, Optional
 
 from events import Events
 
@@ -143,12 +143,16 @@ class SeriesApp:
     def __init__(
         self,
         directory_to_search: str,
+        db_lookup: Optional[Callable[[str], Optional["Serie"]]] = None,
     ):
         """
         Initialize SeriesApp.
 
         Args:
             directory_to_search: Base directory for anime series
+            db_lookup: Optional callable ``(folder_name) -> Serie | None``
+                passed through to ``SerieScanner`` as a fallback key source
+                when no local ``key`` or ``data`` file exists.
         """
 
         self.directory_to_search = directory_to_search
@@ -162,7 +166,10 @@ class SeriesApp:
         self.loaders = Loaders()
         self.loader = self.loaders.GetLoader(key="aniworld.to")
         self.serie_scanner = SerieScanner(
-            directory_to_search, self.loader
+            directory_to_search,
+            self.loader,
+            db_lookup=db_lookup,
+            scan_key_overrides=settings.scan_key_overrides,
         )
         # Skip automatic loading from data files - series will be loaded
         # from database by the service layer during application setup
@@ -171,23 +178,26 @@ class SeriesApp:
         # Initialize empty list - series loaded later via load_series_from_list()
         # No need to call _init_list_sync() anymore
         
-        # Initialize NFO service if TMDB API key is configured
+        # Initialize NFO service if a TMDB API key is configured
         self.nfo_service: Optional[NFOService] = None
-        if settings.tmdb_api_key:
-            try:
-                from src.core.services.nfo_factory import get_nfo_factory
-                factory = get_nfo_factory()
-                self.nfo_service = factory.create()
-                logger.info("NFO service initialized successfully")
-            except (ValueError, Exception) as e:  # pylint: disable=broad-except
-                logger.warning(
-                    "Failed to initialize NFO service: %s", str(e)
-                )
-                self.nfo_service = None
+        try:
+            from src.core.services.nfo_factory import get_nfo_factory
+
+            factory = get_nfo_factory()
+            self.nfo_service = factory.create()
+            logger.info("NFO service initialized successfully")
+        except ValueError:
+            logger.info(
+                "NFO service not available — TMDB API key not configured"
+            )
+            self.nfo_service = None
+        except Exception as e:  # pylint: disable=broad-except
+            logger.warning("Failed to initialize NFO service: %s", str(e))
+            self.nfo_service = None
 
         logger.info(
             "SeriesApp initialized for directory: %s",
-            directory_to_search
+            directory_to_search,
         )
 
     @property
@@ -438,9 +448,12 @@ class SeriesApp:
         try:
             def download_progress_handler(progress_info):
                 """Handle download progress events from loader."""
-                logger.debug(
-                    "download_progress_handler called with: %s", progress_info
-                )
+                # Throttle progress logging to avoid spam
+                status = progress_info.get("status", "")
+                if status in ("downloading", "finished"):
+                    logger.debug(
+                        "download_progress_handler called with: %s", progress_info
+                    )
 
                 downloaded = progress_info.get('downloaded_bytes', 0)
                 total_bytes = (

src/core/entities/SerieList.py

@@ -1,320 +1,531 @@
-"""Utilities for loading and managing stored anime series metadata.
-
-This module provides the SerieList class for managing collections of anime
-series metadata. It uses file-based storage only.
-
-Note:
-    This module is part of the core domain layer and has no database
-    dependencies. All database operations are handled by the service layer.
-"""
-
-from __future__ import annotations
-
-import logging
-import os
-import warnings
-from json import JSONDecodeError
-from typing import Dict, Iterable, List, Optional
-
-from src.core.entities.series import Serie
-
-logger = logging.getLogger(__name__)
-
-
-class SerieList:
-    """
-    Represents the collection of cached series stored on disk.
-    
-    Series are identified by their unique 'key' (provider identifier).
-    The 'folder' is metadata only and not used for lookups.
-    
-    This class manages in-memory series data loaded from filesystem.
-    It has no database dependencies - all persistence is handled by
-    the service layer.
-    
-    Example:
-        # File-based mode
-        serie_list = SerieList("/path/to/anime")
-        series = serie_list.get_all()
-    
-    Attributes:
-        directory: Path to the anime directory
-        keyDict: Internal dictionary mapping serie.key to Serie objects
-    """
-
-    def __init__(
-        self,
-        base_path: str,
-        skip_load: bool = False
-    ) -> None:
-        """Initialize the SerieList.
-        
-        Args:
-            base_path: Path to the anime directory
-            skip_load: If True, skip automatic loading of series from files.
-                Useful when planning to load from database instead.
-        """
-        self.directory: str = base_path
-        # Internal storage using serie.key as the dictionary key
-        self.keyDict: Dict[str, Serie] = {}
-        
-        # Only auto-load from files if not skipping
-        if not skip_load:
-            self.load_series()
-
-    def add(self, serie: Serie, use_sanitized_folder: bool = True) -> str:
-        """
-        Persist a new series if it is not already present (file-based mode).
-        
-        Uses serie.key for identification. Creates the filesystem folder
-        using either the sanitized display name (default) or the existing
-        folder property.
-        
-        Args:
-            serie: The Serie instance to add
-            use_sanitized_folder: If True (default), use serie.sanitized_folder
-                for the filesystem folder name based on display name.
-                If False, use serie.folder as-is for backward compatibility.
-        
-        Returns:
-            str: The folder path that was created/used
-        
-        Note:
-            This method creates data files on disk. For database storage,
-            use add_to_db() instead.
-        """
-        if self.contains(serie.key):
-            # Return existing folder path
-            existing = self.keyDict[serie.key]
-            return os.path.join(self.directory, existing.folder)
-
-        # Determine folder name to use
-        if use_sanitized_folder:
-            folder_name = serie.sanitized_folder
-            # Update the serie's folder property to match what we create
-            serie.folder = folder_name
-        else:
-            folder_name = serie.folder
-
-        data_path = os.path.join(self.directory, folder_name, "data")
-        anime_path = os.path.join(self.directory, folder_name)
-        os.makedirs(anime_path, exist_ok=True)
-        if not os.path.isfile(data_path):
-            serie.save_to_file(data_path)
-            # Store by key, not folder
-            self.keyDict[serie.key] = serie
-        
-        return anime_path
-
-    def contains(self, key: str) -> bool:
-        """
-        Return True when a series identified by ``key`` already exists.
-        
-        Args:
-            key: The unique provider identifier for the series
-            
-        Returns:
-            True if the series exists in the collection
-        """
-        return key in self.keyDict
-
-    def load_series(self) -> None:
-        """Populate the in-memory map with metadata discovered on disk."""
-
-        logging.info("Scanning anime folders in %s", self.directory)
-        try:
-            entries: Iterable[str] = os.listdir(self.directory)
-        except OSError as error:
-            logging.error(
-                "Unable to scan directory %s: %s",
-                self.directory,
-                error,
-            )
-            return
-
-        nfo_stats = {"total": 0, "with_nfo": 0, "without_nfo": 0}
-        media_stats = {
-            "with_poster": 0,
-            "without_poster": 0,
-            "with_logo": 0,
-            "without_logo": 0,
-            "with_fanart": 0,
-            "without_fanart": 0
-        }
-
-        for anime_folder in entries:
-            anime_path = os.path.join(self.directory, anime_folder, "data")
-            if os.path.isfile(anime_path):
-                logging.debug("Found data file for folder %s", anime_folder)
-                serie = self._load_data(anime_folder, anime_path)
-                
-                if serie:
-                    nfo_stats["total"] += 1
-                    # Check for NFO file
-                    nfo_file_path = os.path.join(
-                        self.directory, anime_folder, "tvshow.nfo"
-                    )
-                    if os.path.isfile(nfo_file_path):
-                        serie.nfo_path = nfo_file_path
-                        nfo_stats["with_nfo"] += 1
-                    else:
-                        nfo_stats["without_nfo"] += 1
-                        logging.debug(
-                            "Series '%s' (key: %s) is missing tvshow.nfo",
-                            serie.name,
-                            serie.key
-                        )
-                    
-                    # Check for media files
-                    folder_path = os.path.join(self.directory, anime_folder)
-                    
-                    poster_path = os.path.join(folder_path, "poster.jpg")
-                    if os.path.isfile(poster_path):
-                        media_stats["with_poster"] += 1
-                    else:
-                        media_stats["without_poster"] += 1
-                        logging.debug(
-                            "Series '%s' (key: %s) is missing poster.jpg",
-                            serie.name,
-                            serie.key
-                        )
-                    
-                    logo_path = os.path.join(folder_path, "logo.png")
-                    if os.path.isfile(logo_path):
-                        media_stats["with_logo"] += 1
-                    else:
-                        media_stats["without_logo"] += 1
-                        logging.debug(
-                            "Series '%s' (key: %s) is missing logo.png",
-                            serie.name,
-                            serie.key
-                        )
-                    
-                    fanart_path = os.path.join(folder_path, "fanart.jpg")
-                    if os.path.isfile(fanart_path):
-                        media_stats["with_fanart"] += 1
-                    else:
-                        media_stats["without_fanart"] += 1
-                        logging.debug(
-                            "Series '%s' (key: %s) is missing fanart.jpg",
-                            serie.name,
-                            serie.key
-                        )
-                
-                continue
-
-            logging.warning(
-                "Skipping folder %s because no metadata file was found",
-                anime_folder,
-            )
-        
-        # Log summary statistics
-        if nfo_stats["total"] > 0:
-            logging.info(
-                "NFO scan complete: %d series total, %d with NFO, %d without NFO",
-                nfo_stats["total"],
-                nfo_stats["with_nfo"],
-                nfo_stats["without_nfo"]
-            )
-            logging.info(
-                "Media scan complete: Poster (%d/%d), Logo (%d/%d), Fanart (%d/%d)",
-                media_stats["with_poster"],
-                nfo_stats["total"],
-                media_stats["with_logo"],
-                nfo_stats["total"],
-                media_stats["with_fanart"],
-                nfo_stats["total"]
-            )
-
-    def _load_data(self, anime_folder: str, data_path: str) -> Optional[Serie]:
-        """
-        Load a single series metadata file into the in-memory collection.
-        
-        Args:
-            anime_folder: The folder name (for logging only)
-            data_path: Path to the metadata file
-            
-        Returns:
-            Serie: The loaded Serie object, or None if loading failed
-        """
-        try:
-            serie = Serie.load_from_file(data_path)
-            # Store by key, not folder
-            self.keyDict[serie.key] = serie
-            logging.debug(
-                "Successfully loaded metadata for %s (key: %s)",
-                anime_folder,
-                serie.key
-            )
-            return serie
-        except (OSError, JSONDecodeError, KeyError, ValueError) as error:
-            logging.error(
-                "Failed to load metadata for folder %s from %s: %s",
-                anime_folder,
-                data_path,
-                error,
-            )
-            return None
-
-    def GetMissingEpisode(self) -> List[Serie]:
-        """Return all series that still contain missing episodes."""
-        return [
-            serie
-            for serie in self.keyDict.values()
-            if serie.episodeDict
-        ]
-
-    def get_missing_episodes(self) -> List[Serie]:
-        """PEP8-friendly alias for :meth:`GetMissingEpisode`."""
-        return self.GetMissingEpisode()
-
-    def GetList(self) -> List[Serie]:
-        """Return all series instances stored in the list."""
-        return list(self.keyDict.values())
-
-    def get_all(self) -> List[Serie]:
-        """PEP8-friendly alias for :meth:`GetList`."""
-        return self.GetList()
-    
-    def get_by_key(self, key: str) -> Optional[Serie]:
-        """
-        Get a series by its unique provider key.
-        
-        This is the primary method for series lookup.
-        
-        Args:
-            key: The unique provider identifier (e.g., "attack-on-titan")
-            
-        Returns:
-            The Serie instance if found, None otherwise
-        """
-        return self.keyDict.get(key)
-    
-    def get_by_folder(self, folder: str) -> Optional[Serie]:
-        """
-        Get a series by its folder name.
-        
-        .. deprecated:: 2.0.0
-            Use :meth:`get_by_key` instead. Folder-based lookups will be
-            removed in version 3.0.0. The `folder` field is metadata only
-            and should not be used for identification.
-        
-        This method is provided for backward compatibility only.
-        Prefer using get_by_key() for new code.
-        
-        Args:
-            folder: The filesystem folder name (e.g., "Attack on Titan (2013)")
-            
-        Returns:
-            The Serie instance if found, None otherwise
-        """
-        warnings.warn(
-            "get_by_folder() is deprecated and will be removed in v3.0.0. "
-            "Use get_by_key() instead. The 'folder' field is metadata only.",
-            DeprecationWarning,
-            stacklevel=2
-        )
-        for serie in self.keyDict.values():
-            if serie.folder == folder:
-                return serie
-        return None
+"""Utilities for loading and managing stored anime series metadata.
+
+This module provides the SerieList class for managing collections of anime
+series metadata. It supports loading from both filesystem (legacy) and
+database (primary).
+
+Note:
+    This module is part of the core domain layer. Database operations
+    are handled by the service layer via add_to_db().
+"""
+
+from __future__ import annotations
+
+import logging
+import os
+import warnings
+from json import JSONDecodeError
+from typing import Dict, Iterable, List, Optional
+
+from src.config.settings import settings
+from src.core.entities.series import Serie
+
+logger = logging.getLogger(__name__)
+
+
+class SerieList:
+    """
+    Represents the collection of cached series stored on disk.
+    
+    Series are identified by their unique 'key' (provider identifier).
+    The 'folder' is metadata only and not used for lookups.
+    
+    This class manages in-memory series data loaded from filesystem.
+    It has no database dependencies - all persistence is handled by
+    the service layer.
+    
+    Example:
+        # File-based mode
+        serie_list = SerieList("/path/to/anime")
+        series = serie_list.get_all()
+    
+    Attributes:
+        directory: Path to the anime directory
+        keyDict: Internal dictionary mapping serie.key to Serie objects
+    """
+
+    def __init__(
+        self,
+        base_path: str,
+        skip_load: bool = False
+    ) -> None:
+        """Initialize the SerieList.
+        
+        Args:
+            base_path: Path to the anime directory
+            skip_load: If True, skip automatic loading of series from files.
+                Useful when planning to load from database instead.
+        """
+        self.directory: str = base_path
+        # Internal storage using serie.key as the dictionary key
+        self.keyDict: Dict[str, Serie] = {}
+        
+        # Only auto-load from files if not skipping
+        if not skip_load:
+            self.load_series()
+
+    def add(self, serie: Serie, use_sanitized_folder: bool = True) -> str:
+        """
+        Persist a new series if it is not already present (file-based mode).
+        
+        Uses serie.key for identification. Creates the filesystem folder
+        using either the sanitized display name (default) or the existing
+        folder property.
+        
+        Args:
+            serie: The Serie instance to add
+            use_sanitized_folder: If True (default), use serie.sanitized_folder
+                for the filesystem folder name based on display name.
+                If False, use serie.folder as-is for backward compatibility.
+        
+        Returns:
+            str: The folder path that was created/used
+        
+        Note:
+            This method creates data files on disk. For database storage,
+            use add_to_db() instead.
+        """
+        if self.contains(serie.key):
+            # Return existing folder path
+            existing = self.keyDict[serie.key]
+            return os.path.join(self.directory, existing.folder)
+
+        # Determine folder name to use
+        if use_sanitized_folder:
+            folder_name = serie.sanitized_folder
+            # Update the serie's folder property to match what we create
+            serie.folder = folder_name
+        else:
+            folder_name = serie.folder
+
+        data_path = os.path.join(self.directory, folder_name, "data")
+        anime_path = os.path.join(self.directory, folder_name)
+        os.makedirs(anime_path, exist_ok=True)
+        if not os.path.isfile(data_path):
+            serie.save_to_file(data_path)
+            # Store by key, not folder
+            self.keyDict[serie.key] = serie
+        
+        return anime_path
+
+    async def add_to_db(self, serie: Serie) -> bool:
+        """Persist a new series to the database.
+
+        Creates the filesystem folder using serie.folder, then persists
+        the series metadata to the database.
+
+        Args:
+            serie: The Serie instance to add
+
+        Returns:
+            True if successful, False otherwise
+        """
+        try:
+            from src.server.database.connection import get_async_session_factory
+            from src.server.database.service import AnimeSeriesService, EpisodeService
+
+            folder_name = serie.folder
+            anime_path = os.path.join(self.directory, folder_name)
+            os.makedirs(anime_path, exist_ok=True)
+
+            session_factory = get_async_session_factory()
+            db = session_factory()
+            try:
+                existing = await AnimeSeriesService.get_by_key(db, serie.key)
+                if existing:
+                    logger.debug(
+                        "Series '%s' (key=%s) already exists in DB, skipping",
+                        serie.name, serie.key
+                    )
+                    return True
+
+                anime_series = await AnimeSeriesService.create(
+                    db=db,
+                    key=serie.key,
+                    name=serie.name,
+                    site=serie.site,
+                    folder=folder_name,
+                    year=serie.year
+                )
+                for season, eps in serie.episodeDict.items():
+                    for ep in eps:
+                        await EpisodeService.create(
+                            db=db,
+                            series_id=anime_series.id,
+                            season=season,
+                            episode_number=ep
+                        )
+                await db.commit()
+                self.keyDict[serie.key] = serie
+                logger.info(
+                    "Persisted series '%s' to database",
+                    serie.name
+                )
+                return True
+            except Exception as e:
+                await db.rollback()
+                logger.error(
+                    "Failed to persist series '%s' to DB: %s",
+                    serie.key, e, exc_info=True
+                )
+                return False
+            finally:
+                await db.close()
+        except Exception as e:
+            logger.error(
+                "Could not add series '%s' to DB (DB unavailable?): %s",
+                serie.key, e
+            )
+            return False
+
+    def contains(self, key: str) -> bool:
+        """
+        Return True when a series identified by ``key`` already exists.
+        
+        Args:
+            key: The unique provider identifier for the series
+            
+        Returns:
+            True if the series exists in the collection
+        """
+        return key in self.keyDict
+
+    def load_series(self) -> None:
+        """Populate the in-memory map with metadata discovered on disk."""
+
+        logger.info("Scanning anime folders in %s", self.directory)
+        try:
+            entries: Iterable[str] = os.listdir(self.directory)
+        except OSError as error:
+            logger.error(
+                "Unable to scan directory %s: %s",
+                self.directory,
+                error,
+            )
+            return
+
+        nfo_stats = {"total": 0, "with_nfo": 0, "without_nfo": 0}
+        media_stats = {
+            "with_poster": 0,
+            "without_poster": 0,
+            "with_logo": 0,
+            "without_logo": 0,
+            "with_fanart": 0,
+            "without_fanart": 0
+        }
+
+        for anime_folder in entries:
+            if settings.should_ignore_folder(anime_folder):
+                logger.debug("Skipping ignored folder: %s", anime_folder)
+                continue
+            anime_path = os.path.join(self.directory, anime_folder, "data")
+            if os.path.isfile(anime_path):
+                logger.debug("Found data file for folder %s", anime_folder)
+                serie = self._load_data(anime_folder, anime_path)
+                
+                if serie:
+                    nfo_stats["total"] += 1
+                    # Check for NFO file
+                    nfo_file_path = os.path.join(
+                        self.directory, anime_folder, "tvshow.nfo"
+                    )
+                    if os.path.isfile(nfo_file_path):
+                        serie.nfo_path = nfo_file_path
+                        nfo_stats["with_nfo"] += 1
+                    else:
+                        nfo_stats["without_nfo"] += 1
+                        logger.debug(
+                            "Series '%s' (key: %s) is missing tvshow.nfo",
+                            serie.name,
+                            serie.key
+                        )
+                    
+                    # Check for media files
+                    folder_path = os.path.join(self.directory, anime_folder)
+                    
+                    poster_path = os.path.join(folder_path, "poster.jpg")
+                    if os.path.isfile(poster_path):
+                        media_stats["with_poster"] += 1
+                    else:
+                        media_stats["without_poster"] += 1
+                        logger.debug(
+                            "Series '%s' (key: %s) is missing poster.jpg",
+                            serie.name,
+                            serie.key
+                        )
+                    
+                    logo_path = os.path.join(folder_path, "logo.png")
+                    if os.path.isfile(logo_path):
+                        media_stats["with_logo"] += 1
+                    else:
+                        media_stats["without_logo"] += 1
+                        logger.debug(
+                            "Series '%s' (key: %s) is missing logo.png",
+                            serie.name,
+                            serie.key
+                        )
+                    
+                    fanart_path = os.path.join(folder_path, "fanart.jpg")
+                    if os.path.isfile(fanart_path):
+                        media_stats["with_fanart"] += 1
+                    else:
+                        media_stats["without_fanart"] += 1
+                        logger.debug(
+                            "Series '%s' (key: %s) is missing fanart.jpg",
+                            serie.name,
+                            serie.key
+                        )
+                
+                continue
+
+            logger.warning(
+                "Skipping folder %s because no metadata file was found",
+                anime_folder,
+            )
+        
+        # Log summary statistics
+        if nfo_stats["total"] > 0:
+            logger.info(
+                "NFO scan complete: %d series total, %d with NFO, %d without NFO",
+                nfo_stats["total"],
+                nfo_stats["with_nfo"],
+                nfo_stats["without_nfo"]
+            )
+            logger.info(
+                "Media scan complete: Poster (%d/%d), Logo (%d/%d), Fanart (%d/%d)",
+                media_stats["with_poster"],
+                nfo_stats["total"],
+                media_stats["with_logo"],
+                nfo_stats["total"],
+                media_stats["with_fanart"],
+                nfo_stats["total"]
+            )
+
+    def _load_data(self, anime_folder: str, data_path: str) -> Optional[Serie]:
+        """
+        Load a single series metadata file into the in-memory collection.
+        
+        Args:
+            anime_folder: The folder name (for logging only)
+            data_path: Path to the metadata file
+            
+        Returns:
+            Serie: The loaded Serie object, or None if loading failed
+        """
+        try:
+            serie = Serie.load_from_file(data_path)
+            # Store by key, not folder
+            self.keyDict[serie.key] = serie
+            logger.debug(
+                "Successfully loaded metadata for %s (key: %s)",
+                anime_folder,
+                serie.key
+            )
+            return serie
+        except (OSError, JSONDecodeError, KeyError, ValueError) as error:
+            logger.error(
+                "Failed to load metadata for folder %s from %s: %s",
+                anime_folder,
+                data_path,
+                error,
+            )
+            return None
+
+    def GetMissingEpisode(self) -> List[Serie]:
+        """Return all series that still contain missing episodes."""
+        return [
+            serie
+            for serie in self.keyDict.values()
+            if serie.episodeDict
+        ]
+
+    def get_missing_episodes(self) -> List[Serie]:
+        """PEP8-friendly alias for :meth:`GetMissingEpisode`."""
+        return self.GetMissingEpisode()
+
+    def GetList(self) -> List[Serie]:
+        """Return all series instances stored in the list."""
+        return list(self.keyDict.values())
+
+    def get_all(self) -> List[Serie]:
+        """PEP8-friendly alias for :meth:`GetList`."""
+        return self.GetList()
+    
+    def get_by_key(self, key: str) -> Optional[Serie]:
+        """
+        Get a series by its unique provider key.
+        
+        This is the primary method for series lookup.
+        
+        Args:
+            key: The unique provider identifier (e.g., "attack-on-titan")
+            
+        Returns:
+            The Serie instance if found, None otherwise
+        """
+        return self.keyDict.get(key)
+    
+    def get_by_folder(self, folder: str) -> Optional[Serie]:
+        """
+        Get a series by its folder name.
+        
+        .. deprecated:: 2.0.0
+            Use :meth:`get_by_key` instead. Folder-based lookups will be
+            removed in version 3.0.0. The `folder` field is metadata only
+            and should not be used for identification.
+        
+        This method is provided for backward compatibility only.
+        Prefer using get_by_key() for new code.
+        
+        Args:
+            folder: The filesystem folder name (e.g., "Attack on Titan (2013)")
+            
+        Returns:
+            The Serie instance if found, None otherwise
+        """
+        warnings.warn(
+            "get_by_folder() is deprecated and will be removed in v3.0.0. "
+            "Use get_by_key() instead. The 'folder' field is metadata only.",
+            DeprecationWarning,
+            stacklevel=2
+        )
+        for serie in self.keyDict.values():
+            if serie.folder == folder:
+                return serie
+        return None
+
+    async def load_all_from_db(self) -> int:
+        """Load all series from database into in-memory cache.
+        
+        Retrieves all anime series from the database with their episodes
+        and populates the in-memory keyDict for fast access.
+        
+        This method replaces file-based loading. Use after initialization
+        when database is ready.
+        
+        Returns:
+            int: Number of series loaded into cache
+        """
+        from src.server.database.connection import get_async_session_factory
+        from src.server.database.service import AnimeSeriesService
+        
+        try:
+            session_factory = get_async_session_factory()
+            db = session_factory()
+            try:
+                anime_series_list = await AnimeSeriesService.get_all(
+                    db, with_episodes=True
+                )
+                
+                count = 0
+                for anime_series in anime_series_list:
+                    episode_dict: Dict[int, List[int]] = {}
+                    if anime_series.episodes:
+                        for ep in anime_series.episodes:
+                            if ep.season not in episode_dict:
+                                episode_dict[ep.season] = []
+                            episode_dict[ep.season].append(ep.episode_number)
+                    
+                    serie = Serie(
+                        key=anime_series.key,
+                        name=anime_series.name,
+                        site=anime_series.site,
+                        folder=anime_series.folder,
+                        episodeDict=episode_dict,
+                        year=anime_series.year
+                    )
+                    self.keyDict[serie.key] = serie
+                    count += 1
+                
+                logger.info(
+                    "Loaded %d series from database into in-memory cache",
+                    count
+                )
+                return count
+            finally:
+                await db.close()
+        except RuntimeError:
+            logger.warning(
+                "Database not available, skipping DB load"
+            )
+            return 0
+
+    async def _load_single_series_from_db(
+        self,
+        anime_folder: str
+    ) -> Optional[Serie]:
+        """Load a single series from database by folder name.
+        
+        Looks up a series in the database by its folder name and adds
+        it to the in-memory cache.
+        
+        Args:
+            anime_folder: The filesystem folder name to look up
+            
+        Returns:
+            Serie if found and loaded, None otherwise
+        """
+        from src.server.database.connection import get_async_session_factory
+        from src.server.database.service import AnimeSeriesService
+        
+        try:
+            session_factory = get_async_session_factory()
+            db = session_factory()
+            try:
+                anime_series = await AnimeSeriesService.get_by_folder(
+                    db, anime_folder
+                )
+                if not anime_series:
+                    logger.debug(
+                        "Series with folder '%s' not found in DB",
+                        anime_folder
+                    )
+                    return None
+                
+                episode_dict: Dict[int, List[int]] = {}
+                if anime_series.episodes:
+                    for ep in anime_series.episodes:
+                        if ep.season not in episode_dict:
+                            episode_dict[ep.season] = []
+                        episode_dict[ep.season].append(ep.episode_number)
+                
+                serie = Serie(
+                    key=anime_series.key,
+                    name=anime_series.name,
+                    site=anime_series.site,
+                    folder=anime_series.folder,
+                    episodeDict=episode_dict,
+                    year=anime_series.year
+                )
+                self.keyDict[serie.key] = serie
+                logger.debug(
+                    "Loaded series '%s' (key=%s) from DB",
+                    serie.name, serie.key
+                )
+                return serie
+            finally:
+                await db.close()
+        except RuntimeError:
+            logger.warning(
+                "Database not available, cannot load series '%s'",
+                anime_folder
+            )
+            return None
+
+    def invalidate_cache(self) -> None:
+        """Clear the in-memory cache.
+        
+        Use after database modifications to force reload from DB
+        on next access.
+        """
+        self.keyDict.clear()
+        logger.debug("SerieList in-memory cache invalidated")
+
+    def reload(self) -> None:
+        """Reload series from filesystem (legacy mode).
+        
+        Warning:
+            This method uses file-based loading and should only be
+            used as fallback when database is not available.
+        """
+        self.load_series()

src/core/entities/series.py

@@ -64,6 +64,16 @@ class Serie:
             f"episodeDict={self.episodeDict}{year_str})"
         )
 
+    def __repr__(self):
+        """Concise developer representation of Serie object."""
+        season_count = len(self.episodeDict)
+        episode_count = sum(len(eps) for eps in self.episodeDict.values())
+        year_str = f", year={self.year}" if self.year else ""
+        return (
+            f"Serie(key={self.key!r}, name={self.name!r}"
+            f"{year_str}, seasons={season_count}, episodes={episode_count})"
+        )
+
     @property
     def key(self) -> str:
         """
@@ -261,7 +271,11 @@ class Serie:
             'Dororo (2025)'
         """
         if self._year:
-            return f"{self._name} ({self._year})"
+            import re
+            year_suffix = f" ({self._year})"
+            # Strip ALL trailing year suffixes before appending to prevent duplication
+            clean_name = re.sub(r'(\s*\(\d{4}\))+\s*$', '', self._name).strip()
+            return f"{clean_name}{year_suffix}"
         return self._name
 
     @property

src/core/error_handler.py

@@ -7,7 +7,7 @@ errors in provider operations with automatic retry mechanisms.
 
 import functools
 import logging
-from typing import Any, Callable, TypeVar
+from typing import Any, Callable, Optional, TypeVar
 
 logger = logging.getLogger(__name__)
 
@@ -42,39 +42,85 @@ class DownloadError(Exception):
 class RecoveryStrategies:
     """Strategies for handling errors and recovering from failures."""
 
-    @staticmethod
-    def handle_network_failure(
-        func: Callable, *args: Any, **kwargs: Any
-    ) -> Any:
-        """Handle network failures with basic retry logic."""
-        max_retries = 3
-        for attempt in range(max_retries):
-            try:
-                return func(*args, **kwargs)
-            except (NetworkError, ConnectionError):
-                if attempt == max_retries - 1:
-                    raise
-                logger.warning(
-                    f"Network error on attempt {attempt + 1}, retrying..."
-                )
-                continue
+    def __init__(
+        self,
+        max_retries: int = 3,
+        base_delay: float = 1.0,
+        max_delay: float = 60.0,
+        exponential_base: float = 2.0,
+    ) -> None:
+        """Initialize recovery strategies.
 
-    @staticmethod
-    def handle_download_failure(
+        Args:
+            max_retries: Maximum number of retry attempts.
+            base_delay: Initial delay between retries in seconds.
+            max_delay: Maximum delay between retries in seconds.
+            exponential_base: Base for exponential backoff multiplier.
+        """
+        self.max_retries = max_retries
+        self.base_delay = base_delay
+        self.max_delay = max_delay
+        self.exponential_base = exponential_base
+
+    def _calculate_delay(self, attempt: int) -> float:
+        """Calculate delay for given retry attempt using exponential backoff.
+
+        Args:
+            attempt: Zero-based retry attempt number.
+
+        Returns:
+            Delay in seconds before next retry.
+        """
+        delay = self.base_delay * (self.exponential_base ** attempt)
+        return min(delay, self.max_delay)
+
+    def handle_network_failure(
+        self,
         func: Callable, *args: Any, **kwargs: Any
     ) -> Any:
-        """Handle download failures with retry logic."""
-        max_retries = 2
-        for attempt in range(max_retries):
+        """Handle network failures with exponential backoff retry logic."""
+        last_error: Optional[Exception] = None
+        for attempt in range(self.max_retries):
             try:
                 return func(*args, **kwargs)
-            except DownloadError:
-                if attempt == max_retries - 1:
-                    raise
-                logger.warning(
-                    f"Download error on attempt {attempt + 1}, retrying..."
-                )
-                continue
+            except (NetworkError, ConnectionError, TimeoutError) as exc:
+                last_error = exc
+                if attempt < self.max_retries - 1:
+                    delay = self._calculate_delay(attempt)
+                    logger.warning(
+                        "Network error on attempt %d/%d, retrying in %.1fs: %s",
+                        attempt + 1, self.max_retries, delay, exc
+                    )
+                    import time
+                    time.sleep(delay)
+                    continue
+        if last_error:
+            raise last_error
+        raise NetworkError("Network failure after retries")
+
+    def handle_download_failure(
+        self,
+        func: Callable, *args: Any, **kwargs: Any
+    ) -> Any:
+        """Handle download failures with exponential backoff retry logic."""
+        last_error: Optional[Exception] = None
+        for attempt in range(self.max_retries):
+            try:
+                return func(*args, **kwargs)
+            except DownloadError as exc:
+                last_error = exc
+                if attempt < self.max_retries - 1:
+                    delay = self._calculate_delay(attempt)
+                    logger.warning(
+                        "Download error on attempt %d/%d, retrying in %.1fs: %s",
+                        attempt + 1, self.max_retries, delay, exc
+                    )
+                    import time
+                    time.sleep(delay)
+                    continue
+        if last_error:
+            raise last_error
+        raise DownloadError("Download failed after retries")
 
 
 class FileCorruptionDetector:
@@ -92,7 +138,7 @@ class FileCorruptionDetector:
             # Video files should be at least 1MB
             return file_size > 1024 * 1024
         except Exception as e:
-            logger.error(f"Error checking file validity: {e}")
+            logger.error("Error checking file validity: %s", e)
             return False
 
 
@@ -123,13 +169,18 @@ def with_error_recovery(
                     last_error = e
                     if attempt < max_retries - 1:
                         logger.warning(
-                            f"Error in {context} (attempt {attempt + 1}/"
-                            f"{max_retries}): {e}, retrying..."
+                            "Error in %s (attempt %d/%d): %s, retrying...",
+                            context,
+                            attempt + 1,
+                            max_retries,
+                            e,
                         )
                     else:
                         logger.error(
-                            f"Error in {context} failed after {max_retries} "
-                            f"attempts: {e}"
+                            "Error in %s failed after %d attempts: %s",
+                            context,
+                            max_retries,
+                            e,
                         )
 
             if last_error:

src/core/interfaces/callbacks.py

@@ -12,6 +12,8 @@ from dataclasses import dataclass, field
 from enum import Enum
 from typing import Any, Dict, Optional
 
+logger = logging.getLogger(__name__)
+
 
 class OperationType(str, Enum):
     """Types of operations that can report progress."""
@@ -313,7 +315,7 @@ class CallbackManager:
                 callback.on_progress(context)
             except Exception as e:
                 # Log but don't let callback errors break the operation
-                logging.error(
+                logger.error(
                     "Error in progress callback %s: %s",
                     callback,
                     e,
@@ -332,7 +334,7 @@ class CallbackManager:
                 callback.on_error(context)
             except Exception as e:
                 # Log but don't let callback errors break the operation
-                logging.error(
+                logger.error(
                     "Error in error callback %s: %s",
                     callback,
                     e,
@@ -351,7 +353,7 @@ class CallbackManager:
                 callback.on_completion(context)
             except Exception as e:
                 # Log but don't let callback errors break the operation
-                logging.error(
+                logger.error(
                     "Error in completion callback %s: %s",
                     callback,
                     e,

src/core/providers/config_manager.py

@@ -87,7 +87,7 @@ class ProviderConfigManager:
             settings: Provider settings to apply.
         """
         self._provider_settings[provider_name] = settings
-        logger.info(f"Updated settings for provider: {provider_name}")
+        logger.info("Updated settings for provider: %s", provider_name)
 
     def update_provider_settings(
         self, provider_name: str, **kwargs
@@ -106,7 +106,7 @@ class ProviderConfigManager:
             self._provider_settings[provider_name] = ProviderSettings(
                 name=provider_name, **kwargs
             )
-            logger.info(f"Created new settings for provider: {provider_name}")  # noqa: E501
+            logger.info("Created new settings for provider: %s", provider_name)  # noqa: E501
             return True
 
         settings = self._provider_settings[provider_name]
@@ -152,7 +152,7 @@ class ProviderConfigManager:
         """
         if provider_name in self._provider_settings:
             self._provider_settings[provider_name].enabled = True
-            logger.info(f"Enabled provider: {provider_name}")
+            logger.info("Enabled provider: %s", provider_name)
             return True
         return False
 
@@ -167,7 +167,7 @@ class ProviderConfigManager:
         """
         if provider_name in self._provider_settings:
             self._provider_settings[provider_name].enabled = False
-            logger.info(f"Disabled provider: {provider_name}")
+            logger.info("Disabled provider: %s", provider_name)
             return True
         return False
 
@@ -224,7 +224,7 @@ class ProviderConfigManager:
             value: Setting value.
         """
         self._global_settings[key] = value
-        logger.info(f"Updated global setting {key}: {value}")
+        logger.info("Updated global setting %s: %s", key, value)
 
     def get_all_global_settings(self) -> Dict[str, Any]:
         """Get all global settings.
@@ -307,7 +307,7 @@ class ProviderConfigManager:
             with open(config_path, "w", encoding="utf-8") as f:
                 json.dump(data, f, indent=2)
 
-            logger.info(f"Saved configuration to {config_path}")
+            logger.info("Saved configuration to %s", config_path)
             return True
 
         except Exception as e:

src/core/providers/failover.py

@@ -207,7 +207,7 @@ class ProviderFailover:
         """
         if provider_name not in self._providers:
             self._providers.append(provider_name)
-            logger.info(f"Added provider to failover chain: {provider_name}")
+            logger.info("Added provider to failover chain: %s", provider_name)
 
     def remove_provider(self, provider_name: str) -> bool:
         """Remove a provider from the failover chain.

src/core/providers/health_monitor.py

@@ -151,7 +151,7 @@ class ProviderHealthMonitor:
             except asyncio.CancelledError:
                 break
             except Exception as e:
-                logger.error(f"Error in health check loop: {e}", exc_info=True)
+                logger.exception("Error in health check loop: %s", e)
                 await asyncio.sleep(self._health_check_interval)
 
     async def _perform_health_checks(self) -> None:
@@ -314,7 +314,7 @@ class ProviderHealthMonitor:
         )
 
         best_provider = available[0][0]
-        logger.debug(f"Best provider selected: {best_provider}")
+        logger.debug("Best provider selected: %s", best_provider)
         return best_provider
 
     def _get_recent_metrics(
@@ -355,7 +355,7 @@ class ProviderHealthMonitor:
             provider_name=provider_name
         )
         self._request_history[provider_name].clear()
-        logger.info(f"Reset metrics for provider: {provider_name}")
+        logger.info("Reset metrics for provider: %s", provider_name)
         return True
 
     def get_health_summary(self) -> Dict[str, Any]:

src/core/services/nfo_repair_service.py

@@ -16,6 +16,7 @@ from typing import Dict, List
 from lxml import etree
 
 from src.core.services.nfo_service import NFOService
+from src.core.services.tmdb_client import TMDBAPIError
 
 logger = logging.getLogger(__name__)
 
@@ -120,6 +121,37 @@ def nfo_needs_repair(nfo_path: Path) -> bool:
     return bool(find_missing_tags(nfo_path))
 
 
+def _read_tmdb_id(nfo_path: Path) -> int | None:
+    """Return the TMDB ID stored in an existing NFO, or ``None``.
+
+    Checks both ``<tmdbid>`` and ``<uniqueid type="tmdb">`` elements.
+
+    Args:
+        nfo_path: Absolute path to the ``tvshow.nfo`` file.
+
+    Returns:
+        Integer TMDB ID, or ``None`` if not found or not parseable.
+    """
+    if not nfo_path.exists():
+        return None
+    try:
+        root = etree.parse(str(nfo_path)).getroot()
+
+        for uniqueid in root.findall(".//uniqueid"):
+            if uniqueid.get("type") == "tmdb" and uniqueid.text:
+                return int(uniqueid.text)
+
+        tmdbid_elem = root.find(".//tmdbid")
+        if tmdbid_elem is not None and tmdbid_elem.text:
+            return int(tmdbid_elem.text)
+
+    except (etree.XMLSyntaxError, ValueError):
+        pass
+    except Exception:  # pylint: disable=broad-except
+        pass
+    return None
+
+
 class NfoRepairService:
     """Service that detects and repairs incomplete tvshow.nfo files.
 
@@ -171,10 +203,26 @@ class NfoRepairService:
             ", ".join(missing),
         )
 
-        await self._nfo_service.update_tvshow_nfo(
-            series_name,
-            download_media=False,
-        )
+        try:
+            await self._nfo_service.update_tvshow_nfo(
+                series_name,
+                download_media=False,
+            )
+        except TMDBAPIError as e:
+            if "No TMDB ID found" in str(e):
+                # No TMDB ID in existing NFO — create new one via search
+                logger.info(
+                    "NFO has no TMDB ID, creating new NFO via TMDB search"
+                )
+                await self._nfo_service.create_tvshow_nfo(
+                    serie_name=series_name,
+                    serie_folder=series_name,
+                    download_poster=False,
+                    download_logo=False,
+                    download_fanart=False,
+                )
+            else:
+                raise
 
         logger.info("NFO repair completed: %s", series_name)
         return True

src/core/services/nfo_service.py

@@ -10,6 +10,7 @@ Example:
 
 import logging
 import re
+import unicodedata
 from pathlib import Path
 from typing import Any, Dict, List, Optional, Tuple
 
@@ -19,6 +20,7 @@ from src.core.services.tmdb_client import TMDBAPIError, TMDBClient
 from src.core.utils.image_downloader import ImageDownloader
 from src.core.utils.nfo_generator import generate_tvshow_nfo
 from src.core.utils.nfo_mapper import tmdb_to_nfo_model
+from src.core.entities.nfo_models import TVShowNFO
 
 logger = logging.getLogger(__name__)
 
@@ -53,6 +55,18 @@ class NFOService:
         self.image_size = image_size
         self.auto_create = auto_create
     
+    async def __aenter__(self) -> "NFOService":
+        """Enter async context manager."""
+        await self.tmdb_client.__aenter__()
+        await self.image_downloader.__aenter__()
+        return self
+    
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        """Exit async context manager and cleanup resources."""
+        await self.tmdb_client.close()
+        await self.image_downloader.close()
+        return False
+    
     def has_nfo(self, serie_folder: str) -> bool:
         """Check if tvshow.nfo exists for a series.
         
@@ -83,11 +97,12 @@ class NFOService:
             >>> _extract_year_from_name("Attack on Titan")
             ("Attack on Titan", None)
         """
-        # Match year in parentheses at the end: (YYYY)
+        # Match the last year in parentheses at the end: (YYYY)
         match = re.search(r'\((\d{4})\)\s*$', serie_name)
         if match:
             year = int(match.group(1))
-            clean_name = serie_name[:match.start()].strip()
+            # Strip ALL trailing year suffixes to get a fully clean name
+            clean_name = re.sub(r'(\s*\(\d{4}\))+\s*$', '', serie_name).strip()
             return clean_name, year
         return serie_name, None
     
@@ -110,7 +125,8 @@ class NFOService:
         year: Optional[int] = None,
         download_poster: bool = True,
         download_logo: bool = True,
-        download_fanart: bool = True
+        download_fanart: bool = True,
+        alt_titles: Optional[List[str]] = None
     ) -> Path:
         """Create tvshow.nfo by scraping TMDB.
         
@@ -122,6 +138,7 @@ class NFOService:
             download_poster: Whether to download poster.jpg
             download_logo: Whether to download logo.png
             download_fanart: Whether to download fanart.jpg
+            alt_titles: Alternative titles (e.g., Japanese title) for fallback search
             
         Returns:
             Path to created NFO file
@@ -134,41 +151,102 @@ class NFOService:
         clean_name, extracted_year = self._extract_year_from_name(serie_name)
         if year is None and extracted_year is not None:
             year = extracted_year
-            logger.info(f"Extracted year {year} from series name")
+            logger.info("Extracted year %s from series name", year)
         
         # Use clean name for search
         search_name = clean_name
         
-        logger.info(f"Creating NFO for {search_name} (year: {year})")
+        logger.info("Creating NFO for %s (year: %s)", search_name, year)
         
         folder_path = self.anime_directory / serie_folder
         if not folder_path.exists():
-            logger.info(f"Creating series folder: {folder_path}")
+            logger.info("Creating series folder: %s", folder_path)
             folder_path.mkdir(parents=True, exist_ok=True)
         
-        async with self.tmdb_client:
-            # Search for TV show with clean name (without year)
-            logger.debug(f"Searching TMDB for: {search_name}")
-            search_results = await self.tmdb_client.search_tv_show(search_name)
-            
-            if not search_results.get("results"):
-                raise TMDBAPIError(f"No results found for: {search_name}")
-            
-            # Find best match (consider year if provided)
-            tv_show = self._find_best_match(search_results["results"], search_name, year)
-            tv_id = tv_show["id"]
-            
-            logger.info(f"Found match: {tv_show['name']} (ID: {tv_id})")
-            
-            # Get detailed information
-            details = await self.tmdb_client.get_tv_show_details(
-                tv_id,
-                append_to_response="credits,external_ids,images"
-            )
-            
-            # Get content ratings for FSK
-            content_ratings = await self.tmdb_client.get_tv_show_content_ratings(tv_id)
+        # Check for existing NFO with TMDB ID to skip search
+        nfo_path = folder_path / "tvshow.nfo"
+        existing_ids = None
+        if nfo_path.exists():
+            try:
+                existing_ids = self.parse_nfo_ids(nfo_path)
+                if existing_ids.get("tmdb_id"):
+                    logger.info(
+                        "Found existing TMDB ID %s in NFO, using directly",
+                        existing_ids["tmdb_id"]
+                    )
+            except Exception as e:
+                logger.debug("Could not parse existing NFO IDs: %s", e)
+        
+        try:
+            await self.tmdb_client._ensure_session()
             
+            # Use existing TMDB ID if found, otherwise search
+            if existing_ids and existing_ids.get("tmdb_id"):
+                tv_id = existing_ids["tmdb_id"]
+                logger.info("Fetching details directly for TMDB ID: %s", tv_id)
+                details = await self.tmdb_client.get_tv_show_details(
+                    tv_id,
+                    append_to_response="credits,external_ids,images"
+                )
+                content_ratings = await self.tmdb_client.get_tv_show_content_ratings(tv_id)
+                tv_show = {"id": tv_id, "name": details.get("name", serie_name)}
+                search_source = "nfo_override"
+            else:
+                # Search for TV show - try multiple strategies
+                tv_show, search_source = await self._search_with_fallback(
+                    search_name, year, alt_titles
+                )
+                tv_id = tv_show["id"]
+
+            logger.info("Found match: %s (ID: %s)", tv_show['name'], tv_id)
+
+            # Get detailed information with multi-language image support
+            # Skip if we already fetched details via nfo_override
+            if search_source != "nfo_override":
+                details = await self.tmdb_client.get_tv_show_details(
+                    tv_id,
+                    append_to_response="credits,external_ids,images"
+                )
+
+                # Get content ratings for FSK
+                content_ratings = await self.tmdb_client.get_tv_show_content_ratings(tv_id)
+
+                # Enrich with fallback languages for empty overview/tagline
+                # Pass search result overview as last resort fallback
+                search_overview = tv_show.get("overview") or None
+                if not search_overview:
+                    try:
+                        logger.debug(
+                            "No overview in German search result, trying en-US search fallback for: %s",
+                            search_name,
+                        )
+                        en_search_results = await self.tmdb_client.search_tv_show(
+                            search_name,
+                            language="en-US",
+                        )
+                        if en_search_results.get("results"):
+                            en_match = self._find_best_match(
+                                en_search_results["results"], search_name, year
+                            )
+                            search_overview = en_match.get("overview") or None
+                            if search_overview:
+                                logger.info(
+                                    "Using en-US search overview fallback for %s",
+                                    search_name,
+                                )
+                    except (TMDBAPIError, Exception) as exc:
+                        logger.warning(
+                            "Failed en-US search fallback for overview: %s",
+                            exc,
+                        )
+
+                details = await self._enrich_details_with_fallback(
+                    details, search_overview=search_overview
+                )
+            else:
+                # When using nfo_override, content_ratings already fetched
+                pass
+
             # Convert TMDB data to TVShowNFO model
             nfo_model = tmdb_to_nfo_model(
                 details,
@@ -176,15 +254,15 @@ class NFOService:
                 self.tmdb_client.get_image_url,
                 self.image_size,
             )
-            
+
             # Generate XML
             nfo_xml = generate_tvshow_nfo(nfo_model)
-            
+
             # Save NFO file
             nfo_path = folder_path / "tvshow.nfo"
             nfo_path.write_text(nfo_xml, encoding="utf-8")
-            logger.info(f"Created NFO: {nfo_path}")
-            
+            logger.info("Created NFO: %s", nfo_path)
+
             # Download media files
             await self._download_media_files(
                 details,
@@ -193,8 +271,10 @@ class NFOService:
                 download_logo=download_logo,
                 download_fanart=download_fanart
             )
-            
+
             return nfo_path
+        finally:
+            await self.tmdb_client.close()
     
     async def update_tvshow_nfo(
         self,
@@ -220,7 +300,7 @@ class NFOService:
         if not nfo_path.exists():
             raise FileNotFoundError(f"NFO file not found: {nfo_path}")
         
-        logger.info(f"Updating NFO for {serie_folder}")
+        logger.info("Updating NFO for %s", serie_folder)
         
         # Parse existing NFO to extract TMDB ID
         try:
@@ -246,24 +326,26 @@ class NFOService:
                     f"Delete the NFO and create a new one instead."
                 )
             
-            logger.debug(f"Found TMDB ID: {tmdb_id}")
+            logger.debug("Found TMDB ID: %s", tmdb_id)
             
         except etree.XMLSyntaxError as e:
             raise TMDBAPIError(f"Invalid XML in NFO file: {e}")
         except ValueError as e:
             raise TMDBAPIError(f"Invalid TMDB ID format in NFO: {e}")
         
-        # Fetch fresh data from TMDB
-        async with self.tmdb_client:
-            logger.debug(f"Fetching fresh data for TMDB ID: {tmdb_id}")
+        try:
+            await self.tmdb_client._ensure_session()
+            logger.debug("Fetching fresh data for TMDB ID: %s", tmdb_id)
             details = await self.tmdb_client.get_tv_show_details(
                 tmdb_id,
                 append_to_response="credits,external_ids,images"
             )
-            
+
             # Get content ratings for FSK
             content_ratings = await self.tmdb_client.get_tv_show_content_ratings(tmdb_id)
-            
+
+            # Enrich with fallback languages for empty overview/tagline
+            details = await self._enrich_details_with_fallback(details)
             # Convert TMDB data to TVShowNFO model
             nfo_model = tmdb_to_nfo_model(
                 details,
@@ -271,14 +353,14 @@ class NFOService:
                 self.tmdb_client.get_image_url,
                 self.image_size,
             )
-            
+
             # Generate XML
             nfo_xml = generate_tvshow_nfo(nfo_model)
-            
+
             # Save updated NFO file
             nfo_path.write_text(nfo_xml, encoding="utf-8")
-            logger.info(f"Updated NFO: {nfo_path}")
-            
+            logger.info("Updated NFO: %s", nfo_path)
+
             # Re-download media files if requested
             if download_media:
                 await self._download_media_files(
@@ -288,8 +370,10 @@ class NFOService:
                     download_logo=True,
                     download_fanart=True
                 )
-            
+
             return nfo_path
+        finally:
+            await self.tmdb_client.close()
     
     def parse_nfo_ids(self, nfo_path: Path) -> Dict[str, Optional[int]]:
         """Parse TMDB ID and TVDB ID from an existing NFO file.
@@ -309,7 +393,7 @@ class NFOService:
         result = {"tmdb_id": None, "tvdb_id": None}
         
         if not nfo_path.exists():
-            logger.debug(f"NFO file not found: {nfo_path}")
+            logger.debug("NFO file not found: %s", nfo_path)
             return result
         
         try:
@@ -366,12 +450,143 @@ class NFOService:
             )
             
         except etree.XMLSyntaxError as e:
-            logger.error(f"Invalid XML in NFO file {nfo_path}: {e}")
+            logger.error("Invalid XML in NFO file %s: %s", nfo_path, e)
         except Exception as e:  # pylint: disable=broad-except
-            logger.error(f"Error parsing NFO file {nfo_path}: {e}")
+            logger.error("Error parsing NFO file %s: %s", nfo_path, e)
         
         return result
+
+    def parse_nfo_year(self, nfo_path: Path) -> Optional[int]:
+        """Parse year from an existing NFO file.
+        
+        Extracts year from <year> or <premiered> elements.
+        
+        Args:
+            nfo_path: Path to tvshow.nfo file
+            
+        Returns:
+            Year as integer if found, None otherwise.
+            
+        Example:
+            >>> year = nfo_service.parse_nfo_year(Path("/anime/series/tvshow.nfo"))
+            >>> print(year)
+            2013
+        """
+        if not nfo_path.exists():
+            logger.debug("NFO file not found: %s", nfo_path)
+            return None
+        
+        try:
+            tree = etree.parse(str(nfo_path))
+            root = tree.getroot()
+            
+            # Try <year> element first
+            year_elem = root.find(".//year")
+            if year_elem is not None and year_elem.text:
+                try:
+                    year = int(year_elem.text)
+                    if 1900 <= year <= 2100:
+                        logger.debug("Found year in NFO: %d", year)
+                        return year
+                except ValueError:
+                    pass
+            
+            # Fallback: try <premiered> element (format: YYYY-MM-DD)
+            premiered_elem = root.find(".//premiered")
+            if premiered_elem is not None and premiered_elem.text:
+                if premiered_elem.text and len(premiered_elem.text) >= 4:
+                    try:
+                        year = int(premiered_elem.text[:4])
+                        if 1900 <= year <= 2100:
+                            logger.debug("Found year from premiered in NFO: %d", year)
+                            return year
+                    except ValueError:
+                        pass
+            
+            logger.debug("No year found in NFO: %s", nfo_path)
+            
+        except etree.XMLSyntaxError as e:
+            logger.error("Invalid XML in NFO file %s: %s", nfo_path, e)
+        except Exception as e:  # pylint: disable=broad-except
+            logger.error("Error parsing year from NFO file %s: %s", nfo_path, e)
+        
+        return None
     
+    async def _enrich_details_with_fallback(
+        self,
+        details: Dict[str, Any],
+        search_overview: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        """Enrich TMDB details with fallback languages for empty fields.
+
+        When requesting details in ``de-DE``, some anime have an empty
+        ``overview`` (and potentially other translatable fields).  This
+        method detects empty values and fills them from alternative
+        languages (``en-US``, then ``ja-JP``) so that NFO files always
+        contain a ``plot`` regardless of whether the German translation
+        exists.  As a last resort, the overview from the search result
+        is used.
+
+        Args:
+            details: TMDB TV show details (language ``de-DE``).
+            search_overview: Overview text from the TMDB search result,
+                used as a final fallback if all language-specific
+                requests fail or return empty overviews.
+
+        Returns:
+            The *same* dict, mutated in-place with fallback values
+            where needed.
+        """
+        overview = details.get("overview") or ""
+
+        if overview:
+            # Overview already populated – nothing to do.
+            return details
+
+        tmdb_id = details.get("id")
+        fallback_languages = ["en-US", "ja-JP"]
+
+        for lang in fallback_languages:
+            if details.get("overview"):
+                break
+
+            logger.debug(
+                "Trying %s fallback for TMDB ID %s",
+                lang, tmdb_id,
+            )
+
+            try:
+                lang_details = await self.tmdb_client.get_tv_show_details(
+                    tmdb_id,
+                    language=lang,
+                )
+
+                if not details.get("overview") and lang_details.get("overview"):
+                    details["overview"] = lang_details["overview"]
+                    logger.info(
+                        "Used %s overview fallback for TMDB ID %s",
+                        lang, tmdb_id,
+                    )
+
+                # Also fill tagline if missing
+                if not details.get("tagline") and lang_details.get("tagline"):
+                    details["tagline"] = lang_details["tagline"]
+            except Exception as exc:  # pylint: disable=broad-except
+                logger.warning(
+                    "Failed to fetch %s fallback for TMDB ID %s: %s",
+                    lang, tmdb_id, exc,
+                )
+
+        # Last resort: use search result overview
+        if not details.get("overview") and search_overview:
+            details["overview"] = search_overview
+            logger.info(
+                "Used search result overview fallback for TMDB ID %s",
+                tmdb_id,
+            )
+
+        return details
+
     def _find_best_match(
         self,
         results: List[Dict[str, Any]],
@@ -396,12 +611,167 @@ class NFOService:
             for result in results:
                 first_air_date = result.get("first_air_date", "")
                 if first_air_date.startswith(str(year)):
-                    logger.debug(f"Found year match: {result['name']} ({first_air_date})")
+                    logger.debug("Found year match: %s (%s)", result['name'], first_air_date)
                     return result
         
         # Return first result (usually best match)
         return results[0]
     
+    async def _search_with_fallback(
+        self,
+        primary_query: str,
+        year: Optional[int],
+        alt_titles: Optional[List[str]] = None
+    ) -> Tuple[Dict[str, Any], str]:
+        """Search TMDB with fallback strategies.
+        
+        Tries multiple search strategies in order:
+        1. Primary query with year filter
+        2. Alternative titles (e.g., Japanese name)
+        3. Multi-language search (en-US)
+        4. Search without year constraint
+        5. Punctuation-normalized search
+        
+        Args:
+            primary_query: Primary search term
+            year: Release year for filtering
+            alt_titles: Alternative titles to try if primary fails
+            
+        Returns:
+            Tuple of (matched TV show dict, source description string)
+            
+        Raises:
+            TMDBAPIError: If all search strategies fail
+        """
+        search_strategies = [
+            # Strategy 1: Primary query as-is
+            {"query": primary_query, "year": year, "lang": "de-DE", "desc": "primary"},
+        ]
+        
+        # Strategy 2: Try alt titles (typically Japanese)
+        if alt_titles:
+            for alt in alt_titles:
+                if alt != primary_query:
+                    search_strategies.append(
+                        {"query": alt, "year": year, "lang": "ja-JP", "desc": f"alt_title:{alt}"}
+                    )
+                    search_strategies.append(
+                        {"query": alt, "year": year, "lang": "en-US", "desc": f"alt_title:{alt}"}
+                    )
+        
+        # Strategy 3: Try English search
+        search_strategies.append(
+            {"query": primary_query, "year": year, "lang": "en-US", "desc": "english"}
+        )
+        
+        # Strategy 4: Try without year constraint
+        if year:
+            search_strategies.append(
+                {"query": primary_query, "year": None, "lang": "de-DE", "desc": "no_year"}
+            )
+        
+        # Strategy 5: Normalize punctuation
+        normalized = self._normalize_query_for_search(primary_query)
+        if normalized != primary_query:
+            search_strategies.append(
+                {"query": normalized, "year": year, "lang": "de-DE", "desc": f"normalized:{normalized}"}
+            )
+        
+        # Strategy 6: Try search/multi for series indexed as movies
+        search_strategies.append(
+            {"query": primary_query, "year": year, "lang": "en-US", "desc": "multi_search", "use_multi": True}
+        )
+        
+        last_error = None
+        for strategy in search_strategies:
+            query = strategy["query"]
+            lang = strategy["lang"]
+            desc = strategy["desc"]
+            use_multi = strategy.get("use_multi", False)
+            
+            try:
+                logger.debug(
+                    "TMDB search attempt: query='%s', lang=%s, year=%s, strategy=%s",
+                    query, lang, strategy["year"], desc
+                )
+                
+                # Use search/multi for multi_search strategy
+                if use_multi:
+                    search_results = await self.tmdb_client.search_multi(
+                        query,
+                        language=lang
+                    )
+                    # Filter for TV shows only
+                    if search_results.get("results"):
+                        tv_results = [
+                            r for r in search_results["results"]
+                            if r.get("media_type") == "tv"
+                        ]
+                        if tv_results:
+                            search_results["results"] = tv_results
+                        else:
+                            search_results["results"] = []
+                else:
+                    search_results = await self.tmdb_client.search_tv_show(
+                        query,
+                        language=lang
+                    )
+                
+                if search_results.get("results"):
+                    # Apply year filter if we have one
+                    results = search_results["results"]
+                    if strategy["year"]:
+                        year_filtered = [
+                            r for r in results
+                            if r.get("first_air_date", "").startswith(str(strategy["year"]))
+                        ]
+                        if year_filtered:
+                            match = year_filtered[0]
+                        else:
+                            # Year didn't match, still use first result but log it
+                            match = results[0]
+                            logger.debug(
+                                "Year %s not found in results for '%s', using: %s",
+                                strategy["year"], query, match["name"]
+                            )
+                    else:
+                        match = results[0]
+                    
+                    logger.info(
+                        "TMDB search succeeded: '%s' found via strategy '%s' (ID: %s)",
+                        match["name"], desc, match["id"]
+                    )
+                    return match, desc
+                else:
+                    logger.debug("No results for '%s' via %s", query, desc)
+                    
+            except TMDBAPIError as e:
+                last_error = e
+                logger.debug("Search strategy '%s' failed: %s", desc, e)
+                continue
+        
+        # All strategies exhausted
+        raise TMDBAPIError(
+            f"No results found for: {primary_query} (tried {len(search_strategies)} strategies)"
+        )
+    
+    def _normalize_query_for_search(self, query: str) -> str:
+        """Normalize query by removing punctuation and special chars.
+        
+        Args:
+            query: Original search query
+            
+        Returns:
+            Query with punctuation removed
+        """
+        # Remove common punctuation but keep CJK characters
+        normalized = unicodedata.normalize('NFKC', query)
+        # Remove punctuation but not CJK
+        normalized = re.sub(r'[^\w\s\u3000-\u9fff\u4e00-\u9faf]', '', normalized)
+        # Collapse multiple spaces
+        normalized = re.sub(r'\s+', ' ', normalized).strip()
+        return normalized
+    
 
     
     async def _download_media_files(
@@ -461,7 +831,7 @@ class NFOService:
             skip_existing=True
         )
         
-        logger.info(f"Media download results: {results}")
+        logger.info("Media download results: %s", results)
         return results
     
 
@@ -469,3 +839,53 @@ class NFOService:
     async def close(self):
         """Clean up resources."""
         await self.tmdb_client.close()
+        await self.image_downloader.close()
+    
+    async def create_minimal_nfo(
+        self,
+        serie_name: str,
+        serie_folder: str,
+        year: Optional[int] = None
+    ) -> Path:
+        """Create minimal tvshow.nfo when TMDB lookup fails.
+        
+        Creates a basic NFO with just the title (and year if available)
+        so the series is tracked even without TMDB metadata.
+        
+        Args:
+            serie_name: Name of the series (may include year in parentheses)
+            serie_folder: Series folder name
+            year: Optional release year
+            
+        Returns:
+            Path to created NFO file
+            
+        Raises:
+            FileNotFoundError: If series folder doesn't exist
+        """
+        # Extract year from name if not provided
+        clean_name, extracted_year = self._extract_year_from_name(serie_name)
+        if year is None and extracted_year is not None:
+            year = extracted_year
+        
+        folder_path = self.anime_directory / serie_folder
+        if not folder_path.exists():
+            logger.info("Creating series folder: %s", folder_path)
+            folder_path.mkdir(parents=True, exist_ok=True)
+        
+        # Create minimal NFO model with just title and year
+        nfo_model = TVShowNFO(
+            title=clean_name,
+            year=year,
+            plot=f"No metadata available for {clean_name}. TMDB lookup failed."
+        )
+        
+        # Generate XML
+        nfo_xml = generate_tvshow_nfo(nfo_model)
+        
+        # Save NFO file
+        nfo_path = folder_path / "tvshow.nfo"
+        nfo_path.write_text(nfo_xml, encoding="utf-8")
+        logger.info("Created minimal NFO (no TMDB): %s", nfo_path)
+        
+        return nfo_path

src/core/services/series_manager_service.py

@@ -129,6 +129,9 @@ class SeriesManagerService:
         if not self.nfo_service:
             return
         
+        nfo_exists = False
+        ids = {}
+        
         try:
             folder_path = Path(self.anime_directory) / serie_folder
             nfo_path = folder_path / "tvshow.nfo"
@@ -136,7 +139,7 @@ class SeriesManagerService:
             
             # If NFO exists, parse IDs and update database
             if nfo_exists:
-                logger.debug(f"Parsing IDs from existing NFO for '{serie_name}'")
+                logger.debug("Parsing IDs from existing NFO for '%s'", serie_name)
                 ids = self.nfo_service.parse_nfo_ids(nfo_path)
                 
                 if ids["tmdb_id"] or ids["tvdb_id"]:
@@ -195,22 +198,49 @@ class SeriesManagerService:
                 logger.info(
                     f"Creating NFO for '{serie_name}' ({serie_folder})"
                 )
-                await self.nfo_service.create_tvshow_nfo(
-                    serie_name=serie_name,
-                    serie_folder=serie_folder,
-                    year=year,
-                    download_poster=self.download_poster,
-                    download_logo=self.download_logo,
-                    download_fanart=self.download_fanart
-                )
-                logger.info(f"Successfully created NFO for '{serie_name}'")
+                try:
+                    await self.nfo_service.create_tvshow_nfo(
+                        serie_name=serie_name,
+                        serie_folder=serie_folder,
+                        year=year,
+                        download_poster=self.download_poster,
+                        download_logo=self.download_logo,
+                        download_fanart=self.download_fanart
+                    )
+                    logger.info("Successfully created NFO for '%s'", serie_name)
+                except TMDBAPIError as create_error:
+                    # TMDB lookup failed, create minimal NFO to track the series
+                    logger.warning(
+                        "TMDB lookup failed for '%s', creating minimal NFO: %s",
+                        serie_name, create_error
+                    )
+                    try:
+                        await self.nfo_service.create_minimal_nfo(
+                            serie_name=serie_name,
+                            serie_folder=serie_folder,
+                            year=year
+                        )
+                        logger.info("Created minimal NFO for '%s'", serie_name)
+                    except Exception as minimal_error:
+                        logger.error(
+                            "Failed to create minimal NFO for '%s': %s",
+                            serie_name, minimal_error
+                        )
             elif nfo_exists:
                 logger.debug(
                     f"NFO exists for '{serie_name}', skipping download"
                 )
                     
         except TMDBAPIError as e:
-            logger.error(f"TMDB API error processing '{serie_name}': {e}")
+            # Only log at ERROR if no NFO exists and we have no IDs
+            # If NFO exists with IDs, this is just a lookup failure, log at DEBUG
+            if nfo_exists and (ids.get("tmdb_id") or ids.get("tvdb_id")):
+                logger.debug(
+                    "TMDB API lookup failed for '%s' (has NFO with IDs): %s",
+                    serie_name, e
+                )
+            else:
+                logger.error("TMDB API error processing '%s': %s", serie_name, e)
         except Exception as e:
             logger.error(
                 f"Unexpected error processing NFO for '{serie_name}': {e}",
@@ -246,7 +276,7 @@ class SeriesManagerService:
             logger.info("No series found in database to process")
             return
         
-        logger.info(f"Processing NFO for {len(anime_series_list)} series...")
+        logger.info("Processing NFO for %s series...", len(anime_series_list))
         
         # Create tasks for concurrent processing
         # Each task creates its own database session

src/core/services/tmdb_client.py

@@ -12,6 +12,7 @@ Example:
 
 import asyncio
 import logging
+import time
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
@@ -38,6 +39,7 @@ class TMDBClient:
     
     DEFAULT_BASE_URL = "https://api.themoviedb.org/3"
     DEFAULT_IMAGE_BASE_URL = "https://image.tmdb.org/t/p"
+    NEGATIVE_CACHE_TTL = 86400  # 24 hours
     
     def __init__(
         self,
@@ -63,6 +65,12 @@ class TMDBClient:
         self.max_connections = max_connections
         self.session: Optional[aiohttp.ClientSession] = None
         self._cache: Dict[str, Any] = {}
+        self._negative_cache: Dict[str, float] = {}  # query -> timestamp when cached
+        # TMDB allows ~40 req/s; use 30 concurrent + per-second throttle to stay safe
+        self._semaphore = asyncio.Semaphore(30)
+        self._rate_limit_lock = asyncio.Lock()
+        self._request_timestamps: List[float] = []
+        self._max_requests_per_second = 35  # Stay under TMDB's ~40/s limit
     
     async def __aenter__(self):
         """Async context manager entry."""
@@ -83,7 +91,7 @@ class TMDBClient:
         self,
         endpoint: str,
         params: Optional[Dict[str, Any]] = None,
-        max_retries: int = 3
+        max_retries: int = 5
     ) -> Dict[str, Any]:
         """Make an async request to TMDB API with retries.
         
@@ -107,61 +115,103 @@ class TMDBClient:
         # Cache key for deduplication
         cache_key = f"{endpoint}:{str(sorted(params.items()))}"
         if cache_key in self._cache:
-            logger.debug(f"Cache hit for {endpoint}")
+            logger.debug("Cache hit for %s", endpoint)
             return self._cache[cache_key]
         
+        # Check negative cache (cached empty results)
+        negative_cache_key = f"{endpoint}:{str(sorted(params.items()))}"
+        if negative_cache_key in self._negative_cache:
+            if time.monotonic() - self._negative_cache[negative_cache_key] < self.NEGATIVE_CACHE_TTL:
+                logger.debug("Negative cache hit for %s (cached empty result)", endpoint)
+                return {"results": []}
+            else:
+                # Expired negative cache entry
+                del self._negative_cache[negative_cache_key]
+        
         delay = 1
         last_error = None
         
-        for attempt in range(max_retries):
-            try:
-                # Re-ensure session before each attempt in case it was closed
-                await self._ensure_session()
-                
-                if self.session is None:
-                    raise TMDBAPIError("Session is not available")
-                
-                logger.debug(f"TMDB API request: {endpoint} (attempt {attempt + 1})")
-                async with self.session.get(url, params=params, timeout=aiohttp.ClientTimeout(total=60)) as resp:
-                    if resp.status == 401:
-                        raise TMDBAPIError("Invalid TMDB API key")
-                    elif resp.status == 404:
-                        raise TMDBAPIError(f"Resource not found: {endpoint}")
-                    elif resp.status == 429:
-                        # Rate limit - wait longer
-                        retry_after = int(resp.headers.get('Retry-After', delay * 2))
-                        logger.warning(f"Rate limited, waiting {retry_after}s")
-                        await asyncio.sleep(retry_after)
-                        continue
-                    
-                    resp.raise_for_status()
-                    data = await resp.json()
-                    self._cache[cache_key] = data
-                    return data
-                    
-            except asyncio.TimeoutError as e:
-                last_error = e
-                if attempt < max_retries - 1:
-                    logger.warning(f"Request timeout (attempt {attempt + 1}), retrying in {delay}s")
-                    await asyncio.sleep(delay)
-                    delay *= 2
-                else:
-                    logger.error(f"Request timed out after {max_retries} attempts")
-                    
-            except (aiohttp.ClientError, AttributeError) as e:
-                last_error = e
-                # If connector/session was closed, try to recreate it
-                if "Connector is closed" in str(e) or isinstance(e, AttributeError):
-                    logger.warning(f"Session issue detected, recreating session: {e}")
-                    self.session = None
+        # Rate limiting: ensure we don't exceed ~35 requests/second
+        async with self._rate_limit_lock:
+            now = time.monotonic()
+            # Remove timestamps older than 1 second
+            self._request_timestamps = [
+                ts for ts in self._request_timestamps if now - ts < 1.0
+            ]
+            if len(self._request_timestamps) >= self._max_requests_per_second:
+                sleep_time = 1.0 - (now - self._request_timestamps[0])
+                if sleep_time > 0:
+                    logger.debug("Rate throttling: waiting %.2fs", sleep_time)
+                    await asyncio.sleep(sleep_time)
+            self._request_timestamps.append(time.monotonic())
+        
+        async with self._semaphore:
+            for attempt in range(max_retries):
+                try:
+                    # Re-ensure session before each attempt in case it was closed
                     await self._ensure_session()
-                
-                if attempt < max_retries - 1:
-                    logger.warning(f"Request failed (attempt {attempt + 1}): {e}, retrying in {delay}s")
-                    await asyncio.sleep(delay)
-                    delay *= 2
-                else:
-                    logger.error(f"Request failed after {max_retries} attempts: {e}")
+                    
+                    if self.session is None:
+                        raise TMDBAPIError("Session is not available")
+                    
+                    logger.debug("TMDB API request: %s (attempt %s)", endpoint, attempt + 1)
+                    async with self.session.get(url, params=params, timeout=aiohttp.ClientTimeout(total=60)) as resp:
+                        if resp.status == 401:
+                            raise TMDBAPIError("Invalid TMDB API key")
+                        elif resp.status == 404:
+                            raise TMDBAPIError(f"Resource not found: {endpoint}")
+                        elif resp.status == 429:
+                            # Rate limit - wait longer with exponential backoff
+                            retry_after = int(resp.headers.get('Retry-After', max(delay * 2, 2)))
+                            logger.warning("Rate limited, waiting %ss", retry_after)
+                            await asyncio.sleep(retry_after)
+                            continue
+                        
+                        resp.raise_for_status()
+                        data = await resp.json()
+                        self._cache[cache_key] = data
+                        # Cache negative result if empty
+                        if endpoint.startswith("search/") and not data.get("results"):
+                            self._negative_cache[negative_cache_key] = time.monotonic()
+                            logger.debug("Cached negative result for %s", endpoint)
+                        return data
+                        
+                except asyncio.TimeoutError as e:
+                    last_error = e
+                    if attempt < max_retries - 1:
+                        logger.warning("Request timeout (attempt %s), retrying in %ss", attempt + 1, delay)
+                        await asyncio.sleep(delay)
+                        delay *= 2
+                    else:
+                        logger.error("Request timed out after %s attempts", max_retries)
+                        
+                except (aiohttp.ClientError, AttributeError) as e:
+                    last_error = e
+                    # If connector/session was closed, try to recreate it
+                    if "Connector is closed" in str(e) or isinstance(e, AttributeError):
+                        logger.warning(
+                            "Session issue detected, recreating session: %s",
+                            e,
+                            exc_info=True,
+                        )
+                        self.session = None
+                        await self._ensure_session()
+
+                    # DNS / host-unreachable errors are not transient — abort immediately
+                    error_str = str(e)
+                    if "name resolution" in error_str.lower() or (
+                        isinstance(e, aiohttp.ClientConnectorError) and
+                        "Cannot connect to host" in error_str
+                    ):
+                        logger.error("Non-transient connection error, aborting retries: %s", e)
+                        raise TMDBAPIError(f"Request failed after {attempt + 1} attempts: {e}") from e
+
+                    if attempt < max_retries - 1:
+                        logger.warning("Request failed (attempt %s): %s, retrying in %ss", attempt + 1, e, delay)
+                        await asyncio.sleep(delay)
+                        delay *= 2
+                    else:
+                        logger.error("Request failed after %s attempts: %s", max_retries, e)
         
         raise TMDBAPIError(f"Request failed after {max_retries} attempts: {last_error}")
     
@@ -190,6 +240,34 @@ class TMDBClient:
             {"query": query, "language": language, "page": page}
         )
     
+    async def search_multi(
+        self,
+        query: str,
+        language: str = "en-US",
+        page: int = 1
+    ) -> Dict[str, Any]:
+        """Search for movies and TV shows by name using TMDB multi search.
+        
+        Multi search returns both movies and TV shows, useful for anime
+        that might be indexed as movies on TMDB.
+        
+        Args:
+            query: Search query (show name)
+            language: Language for results (default: English)
+            page: Page number for pagination
+            
+        Returns:
+            Search results with list of movies and TV shows
+            
+        Example:
+            >>> results = await client.search_multi("Suzume no Tojimari")
+            >>> shows = [r for r in results["results"] if r["media_type"] == "tv"]
+        """
+        return await self._request(
+            "search/multi",
+            {"query": query, "language": language, "page": page}
+        )
+    
     async def get_tv_show_details(
         self,
         tv_id: int,
@@ -275,7 +353,7 @@ class TMDBClient:
         url = f"{self.image_base_url}/{size}{image_path}"
         
         try:
-            logger.debug(f"Downloading image from {url}")
+            logger.debug("Downloading image from %s", url)
             async with self.session.get(url, timeout=aiohttp.ClientTimeout(total=60)) as resp:
                 resp.raise_for_status()
                 
@@ -286,7 +364,7 @@ class TMDBClient:
                 with open(local_path, "wb") as f:
                     f.write(await resp.read())
                 
-                logger.info(f"Downloaded image to {local_path}")
+                logger.info("Downloaded image to %s", local_path)
                 
         except aiohttp.ClientError as e:
             raise TMDBAPIError(f"Failed to download image: {e}")
@@ -309,8 +387,38 @@ class TMDBClient:
             await self.session.close()
             self.session = None
             logger.debug("TMDB client session closed")
+
+    def __del__(self):
+        """Warn if session is unclosed during garbage collection."""
+        if self.session is not None and not self.session.closed:
+            logger.warning(
+                "TMDBClient: unclosed session detected. "
+                "Use 'async with TMDBClient(...)' or call close() explicitly."
+            )
     
     def clear_cache(self):
         """Clear the request cache."""
         self._cache.clear()
         logger.debug("TMDB client cache cleared")
+    
+    def clear_negative_cache(self):
+        """Clear the negative result cache."""
+        self._negative_cache.clear()
+        logger.debug("TMDB negative cache cleared")
+    
+    def cleanup_expired_negative_cache(self) -> int:
+        """Remove expired entries from negative cache.
+        
+        Returns:
+            Number of entries removed
+        """
+        now = time.monotonic()
+        expired_keys = [
+            key for key, timestamp in self._negative_cache.items()
+            if now - timestamp >= self.NEGATIVE_CACHE_TTL
+        ]
+        for key in expired_keys:
+            del self._negative_cache[key]
+        if expired_keys:
+            logger.debug("Removed %d expired negative cache entries", len(expired_keys))
+        return len(expired_keys)

src/core/utils/image_downloader.py

@@ -125,7 +125,7 @@ class ImageDownloader:
         # Check if file already exists
         if skip_existing and local_path.exists():
             if local_path.stat().st_size >= self.min_file_size:
-                logger.debug(f"Image already exists: {local_path}")
+                logger.debug("Image already exists: %s", local_path)
                 return True
         
         # Ensure parent directory exists
@@ -137,15 +137,16 @@ class ImageDownloader:
         for attempt in range(self.max_retries):
             try:
                 logger.debug(
-                    f"Downloading image from {url} "
-                    f"(attempt {attempt + 1})"
+                    "Downloading image from %s (attempt %d)",
+                    url,
+                    attempt + 1,
                 )
                 
                 # Use persistent session
                 session = self._get_session()
                 async with session.get(url) as resp:
                     if resp.status == 404:
-                        logger.warning(f"Image not found: {url}")
+                        logger.warning("Image not found: %s", url)
                         return False
                     
                     resp.raise_for_status()
@@ -168,21 +169,25 @@ class ImageDownloader:
                         local_path.unlink(missing_ok=True)
                         raise ImageDownloadError("Image validation failed")
                     
-                    logger.info(f"Downloaded image to {local_path}")
+                    logger.info("Downloaded image to %s", local_path)
                     return True
                         
             except (aiohttp.ClientError, IOError, ImageDownloadError) as e:
                 last_error = e
                 if attempt < self.max_retries - 1:
                     logger.warning(
-                        f"Download failed (attempt {attempt + 1}): {e}, "
-                        f"retrying in {delay}s"
+                        "Download failed (attempt %d): %s, retrying in %s",
+                        attempt + 1,
+                        e,
+                        delay,
                     )
                     await asyncio.sleep(delay)
                     delay *= 2
                 else:
                     logger.error(
-                        f"Download failed after {self.max_retries} attempts: {e}"
+                        "Download failed after %d attempts: %s",
+                        self.max_retries,
+                        e,
                     )
         
         raise ImageDownloadError(
@@ -211,7 +216,7 @@ class ImageDownloader:
         try:
             return await self.download_image(url, local_path, skip_existing)
         except ImageDownloadError as e:
-            logger.warning(f"Failed to download poster: {e}")
+            logger.warning("Failed to download poster: %s", e)
             return False
     
     async def download_logo(
@@ -236,7 +241,7 @@ class ImageDownloader:
         try:
             return await self.download_image(url, local_path, skip_existing)
         except ImageDownloadError as e:
-            logger.warning(f"Failed to download logo: {e}")
+            logger.warning("Failed to download logo: %s", e)
             return False
     
     async def download_fanart(
@@ -261,7 +266,7 @@ class ImageDownloader:
         try:
             return await self.download_image(url, local_path, skip_existing)
         except ImageDownloadError as e:
-            logger.warning(f"Failed to download fanart: {e}")
+            logger.warning("Failed to download fanart: %s", e)
             return False
     
     def validate_image(self, image_path: Path) -> bool:
@@ -280,13 +285,13 @@ class ImageDownloader:
             
             # Check file size
             if image_path.stat().st_size < self.min_file_size:
-                logger.warning(f"Image file too small: {image_path}")
+                logger.warning("Image file too small: %s", image_path)
                 return False
             
             return True
             
         except Exception as e:
-            logger.warning(f"Image validation failed for {image_path}: {e}")
+            logger.warning("Image validation failed for %s: %s", image_path, e)
             return False
     
     async def download_all_media(
@@ -341,7 +346,7 @@ class ImageDownloader:
             
             for (media_type, _), result in zip(tasks, task_results):
                 if isinstance(result, Exception):
-                    logger.error(f"Error downloading {media_type}: {result}")
+                    logger.error("Error downloading %s: %s", media_type, result)
                     results[media_type] = False
                 else:
                     results[media_type] = result

src/core/utils/key_utils.py

@@ -0,0 +1,248 @@
+"""Utility functions for generating URL-safe keys from folder names.
+
+This module provides key generation and normalization for anime series,
+handling edge cases like non-Latin characters and special symbols.
+"""
+from __future__ import annotations
+
+import re
+import unicodedata
+import uuid
+from typing import Optional
+
+# Valid key pattern: alphanumeric, hyphens, underscores
+# Must be at least 1 char, URL-safe
+VALID_KEY_PATTERN = re.compile(r'^[a-zA-Z0-9][a-zA-Z0-9_-]*$')
+
+
+def normalize_key(key: str) -> str:
+    """Normalize a key to a URL-safe format.
+
+    Args:
+        key: The key to normalize
+
+    Returns:
+        Normalized lowercase key with spaces replaced by hyphens
+    """
+    if not key:
+        return ""
+
+    # Convert to lowercase
+    normalized = key.lower()
+
+    # Replace spaces and underscores with hyphens
+    normalized = re.sub(r'[\s_]+', '-', normalized)
+
+    # Remove any characters that aren't alphanumeric or hyphens
+    normalized = re.sub(r'[^a-z0-9-]', '', normalized)
+
+    # Collapse multiple consecutive hyphens
+    normalized = re.sub(r'-+', '-', normalized)
+
+    # Remove leading/trailing hyphens
+    normalized = normalized.strip('-')
+
+    return normalized
+
+
+def is_valid_key(key: str) -> bool:
+    """Check if a key is valid for URL-safe use.
+
+    Args:
+        key: The key to validate
+
+    Returns:
+        True if key is valid (non-empty, URL-safe, alphanumeric start/end, min 2 chars)
+    """
+    if not key or not key.strip():
+        return False
+
+    if len(key) < 2:
+        return False
+
+    return bool(VALID_KEY_PATTERN.match(key))
+
+
+def generate_key_from_folder(folder_name: str) -> str:
+    """Generate a URL-safe key from a folder name.
+
+    Handles edge cases:
+    - Non-Latin characters (Japanese, Chinese, etc.)
+    - Special characters
+    - All-invalid names that normalize to empty
+
+    Args:
+        folder_name: The folder name to convert to a key
+
+    Returns:
+        A URL-safe key string. Never returns empty string.
+
+    Examples:
+        >>> generate_key_from_folder("Attack on Titan (2013)")
+        'attack-on-titan-2013'
+        >>> generate_key_from_folder("A Time Called You (2023)")
+        'a-time-called-you-2023'
+        >>> generate_key_from_folder("25-sai no Joshikousei (2018)")
+        '25-sai-no-joshikousei-2018'
+    """
+    if not folder_name or not folder_name.strip():
+        raise ValueError("Folder name cannot be empty")
+
+    # Step 1: Unicode NFC normalization (preserves international chars)
+    normalized = unicodedata.normalize('NFC', folder_name.strip())
+
+    # Step 2: Extract alphanumeric parts, preserving international chars
+    # This keeps Japanese/Chinese characters but removes special symbols
+    parts = []
+
+    for char in normalized:
+        # Keep Unicode alphanumeric characters (letters/numbers from any script)
+        if char.isalnum():
+            parts.append(char)
+        elif char.isspace():
+            parts.append(' ')
+        # Handle apostrophes - treat as part of word (remove, don't replace with space)
+        # This normalizes e.g., "Hell's" -> "Hells"
+        # Includes: ' (0x27), ' (0x2018), ' (0x2019), ' (0x02BC), ` (0x0060)
+        elif char in ("'", "'", "'", "'", "`", """, """):
+            pass  # Skip - drop the apostrophe
+        else:
+            parts.append(' ')
+
+    working = ''.join(parts)
+
+    # Step 3: Split into words and normalize each
+    words = working.split()
+
+    # Step 4: Convert to lowercase and create hyphenated key
+    key = '-'.join(word.lower() for word in words if word)
+
+    # Step 5: If we got a valid key, return it
+    if key and is_valid_key(key):
+        return key
+
+    # Step 6: Try just alphanumeric characters
+    alphanumeric_only = re.sub(r'[^a-zA-Z0-9\s]', '', working)
+    words = alphanumeric_only.split()
+    key = '-'.join(word.lower() for word in words if word)
+
+    if key and is_valid_key(key):
+        return key
+
+    # Step 7: Last resort - use folder name directly with transliteration
+    # Try to convert non-ASCII to ASCII equivalents
+    try:
+        # Use NFD normalization and strip combining characters
+        # This effectively Latinizes some characters
+        nfd_form = unicodedata.normalize('NFD', folder_name)
+        latinized = ''.join(
+            char for char in nfd_form
+            if unicodedata.category(char) != 'Mn'  # Strip combining marks
+        )
+        # Remove non-ASCII letters
+        latinized = re.sub(r'[^a-zA-Z0-9\s]', ' ', latinized)
+        words = latinized.split()
+        key = '-'.join(word.lower() for word in words if word)
+
+        if key and is_valid_key(key):
+            return key
+    except Exception:
+        pass
+
+    # Step 8: Absolute fallback - generate UUID-based key
+    # Use first 8 chars of UUID for brevity
+    uuid_key = uuid.uuid4().hex[:8]
+
+    # Try to extract any meaningful words from the original name
+    meaningful_parts = []
+    for char in folder_name:
+        if char.isalnum():
+            meaningful_parts.append(char.lower())
+        elif len(meaningful_parts) > 0:
+            meaningful_parts.append('-')
+
+    fallback_base = ''.join(meaningful_parts).strip('-')
+    if fallback_base and len(fallback_base) >= 2:
+        # Combine meaningful parts with UUID for uniqueness
+        # Truncate meaningful parts if too long
+        if len(fallback_base) > 20:
+            fallback_base = fallback_base[:20]
+        return f"{fallback_base}-{uuid_key}"
+
+    return f"series-{uuid_key}"
+
+
+def validate_key_uniqueness(
+    key: str,
+    existing_keys: set[str],
+) -> tuple[bool, str]:
+    """Validate that a key is unique among existing keys.
+
+    Args:
+        key: The key to validate
+        existing_keys: Set of keys that already exist
+
+    Returns:
+        Tuple of (is_valid, error_message)
+    """
+    if not key or not key.strip():
+        return False, "Key cannot be empty"
+
+    stripped = key.strip()
+    if len(stripped) < 2:
+        return False, "Key must be at least 2 characters"
+
+    if not is_valid_key(stripped):
+        return False, "Key must be URL-safe (alphanumeric, hyphens, underscores only)"
+
+    if stripped in existing_keys:
+        return False, f"Key '{stripped}' is already in use"
+
+    return True, ""
+
+
+def sanitize_key_for_url(key: str) -> str:
+    """Sanitize a key for safe URL usage.
+
+    Args:
+        key: The key to sanitize
+
+    Returns:
+        URL-safe version of the key
+    """
+    if not key:
+        return ""
+
+    # Replace spaces with hyphens first
+    sanitized = key.replace(' ', '-')
+
+    # Remove any characters that could cause URL issues (keep alphanumerics, hyphens, underscores)
+    sanitized = re.sub(r'[^\w\-]', '', sanitized)
+
+    # Collapse multiple hyphens
+    sanitized = re.sub(r'-+', '-', sanitized)
+
+    return sanitized.strip('-')
+
+
+def sanitize_url_for_logging(url: str, max_length: int = 100) -> str:
+    """Sanitize a URL for safe logging by removing sensitive query parameters.
+
+    Removes or truncates query parameters that may contain tokens, keys,
+    or other sensitive data while preserving enough structure for debugging.
+
+    Args:
+        url: The URL to sanitize
+        max_length: Maximum length of the returned URL string
+
+    Returns:
+        Sanitized URL safe for logging
+    """
+    if not url:
+        return ""
+
+    # Truncate if too long
+    if len(url) > max_length:
+        return url[:max_length] + "..."
+
+    return url

src/core/utils/nfo_generator.py

@@ -43,8 +43,10 @@ def generate_tvshow_nfo(tvshow: TVShowNFO, pretty_print: bool = True) -> str:
     _add_element(root, "sorttitle", tvshow.sorttitle)
     _add_element(root, "year", str(tvshow.year) if tvshow.year else None)
     
-    # Plot and description
-    _add_element(root, "plot", tvshow.plot)
+    # Plot and description – always write <plot> even when empty so that
+    # all NFO files have a consistent set of tags regardless of whether they
+    # were produced by create or update.
+    _add_element(root, "plot", tvshow.plot, always_write=True)
     _add_element(root, "outline", tvshow.outline)
     _add_element(root, "tagline", tvshow.tagline)
     
@@ -164,13 +166,23 @@ def generate_tvshow_nfo(tvshow: TVShowNFO, pretty_print: bool = True) -> str:
     return xml_declaration + xml_str
 
 
-def _add_element(parent: etree.Element, tag: str, text: Optional[str]) -> Optional[etree.Element]:
+def _add_element(
+    parent: etree.Element,
+    tag: str,
+    text: Optional[str],
+    always_write: bool = False,
+) -> Optional[etree.Element]:
     """Add a child element to parent if text is not None or empty.
     
     Args:
         parent: Parent XML element
         tag: Tag name for child element
-        text: Text content (None or empty strings are skipped)
+        text: Text content (None or empty strings are skipped
+              unless *always_write* is True)
+        always_write: When True the element is created even when
+                      *text* is None/empty (the element will have
+                      no text content).  Useful for tags like
+                      ``<plot>`` that should always be present.
         
     Returns:
         Created element or None if skipped
@@ -179,6 +191,8 @@ def _add_element(parent: etree.Element, tag: str, text: Optional[str]) -> Option
         elem = etree.SubElement(parent, tag)
         elem.text = text
         return elem
+    if always_write:
+        return etree.SubElement(parent, tag)
     return None
 
 
@@ -195,5 +209,5 @@ def validate_nfo_xml(xml_string: str) -> bool:
         etree.fromstring(xml_string.encode('utf-8'))
         return True
     except etree.XMLSyntaxError as e:
-        logger.error(f"Invalid NFO XML: {e}")
+        logger.error("Invalid NFO XML: %s", e)
         return False

src/core/utils/nfo_mapper.py

@@ -14,6 +14,7 @@ from typing import Any, Callable, Dict, List, Optional
 from src.core.entities.nfo_models import (
     ActorInfo,
     ImageInfo,
+    NamedSeason,
     RatingInfo,
     TVShowNFO,
     UniqueID,
@@ -167,6 +168,17 @@ def tmdb_to_nfo_model(
             tmdbid=member["id"],
         ))
 
+    # --- Named seasons ---
+    named_seasons: List[NamedSeason] = []
+    for season_info in tmdb_data.get("seasons", []):
+        season_name = season_info.get("name")
+        season_number = season_info.get("season_number")
+        if season_name and season_number is not None:
+            named_seasons.append(NamedSeason(
+                number=season_number,
+                name=season_name,
+            ))
+
     # --- Unique IDs ---
     unique_ids: List[UniqueID] = []
     if tmdb_data.get("id"):
@@ -194,6 +206,7 @@ def tmdb_to_nfo_model(
     return TVShowNFO(
         title=title,
         originaltitle=original_title,
+        showtitle=title,
         sorttitle=title,
         year=year,
         plot=tmdb_data.get("overview") or None,
@@ -215,6 +228,7 @@ def tmdb_to_nfo_model(
         thumb=thumb_images,
         fanart=fanart_images,
         actors=actors,
+        namedseason=named_seasons,
         watched=False,
         dateadded=datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
     )

src/infrastructure/security/config_encryption.py

@@ -36,10 +36,10 @@ class ConfigEncryption:
     def _ensure_key_exists(self) -> None:
         """Ensure encryption key exists or create one."""
         if not self.key_file.exists():
-            logger.info(f"Creating new encryption key at {self.key_file}")
+            logger.info("Creating new encryption key at %s", self.key_file)
             self._generate_new_key()
         else:
-            logger.info(f"Using existing encryption key from {self.key_file}")
+            logger.info("Using existing encryption key from %s", self.key_file)
 
     def _generate_new_key(self) -> None:
         """Generate and store a new encryption key."""
@@ -56,7 +56,7 @@ class ConfigEncryption:
             logger.info("Generated new encryption key")
 
         except IOError as e:
-            logger.error(f"Failed to generate encryption key: {e}")
+            logger.error("Failed to generate encryption key: %s", e)
             raise
 
     def _load_key(self) -> bytes:
@@ -77,7 +77,7 @@ class ConfigEncryption:
             key = self.key_file.read_bytes()
             return key
         except IOError as e:
-            logger.error(f"Failed to load encryption key: {e}")
+            logger.error("Failed to load encryption key: %s", e)
             raise
 
     def _get_cipher(self) -> Fernet:
@@ -117,7 +117,7 @@ class ConfigEncryption:
             return encrypted_str
 
         except Exception as e:
-            logger.error(f"Failed to encrypt value: {e}")
+            logger.error("Failed to encrypt value: %s", e)
             raise
 
     def decrypt_value(self, encrypted_value: str) -> str:
@@ -149,7 +149,7 @@ class ConfigEncryption:
             return decrypted_str
 
         except Exception as e:
-            logger.error(f"Failed to decrypt value: {e}")
+            logger.error("Failed to decrypt value: %s", e)
             raise
 
     def encrypt_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
@@ -191,9 +191,9 @@ class ConfigEncryption:
                         'encrypted': True,
                         'value': self.encrypt_value(value)
                     }
-                    logger.debug(f"Encrypted config field: {key}")
+                    logger.debug("Encrypted config field: %s", key)
                 except Exception as e:
-                    logger.warning(f"Failed to encrypt {key}: {e}")
+                    logger.warning("Failed to encrypt %s: %s", key, e)
                     encrypted_config[key] = value
             else:
                 encrypted_config[key] = value
@@ -222,9 +222,9 @@ class ConfigEncryption:
                     decrypted_config[key] = self.decrypt_value(
                         value['value']
                     )
-                    logger.debug(f"Decrypted config field: {key}")
+                    logger.debug("Decrypted config field: %s", key)
                 except Exception as e:
-                    logger.error(f"Failed to decrypt {key}: {e}")
+                    logger.error("Failed to decrypt %s: %s", key, e)
                     decrypted_config[key] = None
             else:
                 decrypted_config[key] = value
@@ -248,7 +248,7 @@ class ConfigEncryption:
         if self.key_file.exists():
             backup_path = self.key_file.with_suffix('.key.bak')
             self.key_file.rename(backup_path)
-            logger.info(f"Backed up old key to {backup_path}")
+            logger.info("Backed up old key to %s", backup_path)
 
         # Generate new key
         if new_key_file:

src/infrastructure/security/database_integrity.py

@@ -276,13 +276,13 @@ class DatabaseIntegrityChecker:
                 removed += 1
 
             self.session.commit()
-            logger.info(f"Removed {removed} orphaned records")
+            logger.info("Removed %s orphaned records", removed)
 
             return removed
 
         except Exception as e:
             self.session.rollback()
-            logger.error(f"Error removing orphaned records: {e}")
+            logger.error("Error removing orphaned records: %s", e)
             raise
 
 

src/infrastructure/security/file_integrity.py

@@ -39,13 +39,15 @@ class FileIntegrityManager:
                     self.checksums = json.load(f)
                 count = len(self.checksums)
                 logger.info(
-                    f"Loaded {count} checksums from {self.checksum_file}"
+                    "Loaded %d checksums from %s",
+                    count,
+                    self.checksum_file,
                 )
             except (json.JSONDecodeError, IOError) as e:
-                logger.error(f"Failed to load checksums: {e}")
+                logger.error("Failed to load checksums: %s", e)
                 self.checksums = {}
         else:
-            logger.info(f"Checksum file does not exist: {self.checksum_file}")
+            logger.info("Checksum file does not exist: %s", self.checksum_file)
             self.checksums = {}
 
     def _save_checksums(self) -> None:
@@ -56,10 +58,12 @@ class FileIntegrityManager:
                 json.dump(self.checksums, f, indent=2)
             count = len(self.checksums)
             logger.debug(
-                f"Saved {count} checksums to {self.checksum_file}"
+                "Saved %d checksums to %s",
+                count,
+                self.checksum_file,
             )
         except IOError as e:
-            logger.error(f"Failed to save checksums: {e}")
+            logger.error("Failed to save checksums: %s", e)
 
     def calculate_checksum(
         self, file_path: Path, algorithm: str = "sha256"
@@ -94,12 +98,15 @@ class FileIntegrityManager:
             checksum = hash_obj.hexdigest()
             filename = file_path.name
             logger.debug(
-                f"Calculated {algorithm} checksum for {filename}: {checksum}"
+                "Calculated %s checksum for %s: %s",
+                algorithm,
+                filename,
+                checksum,
             )
             return checksum
         
         except IOError as e:
-            logger.error(f"Failed to read file {file_path}: {e}")
+            logger.error("Failed to read file %s: %s", file_path, e)
             raise
 
     def store_checksum(
@@ -126,7 +133,7 @@ class FileIntegrityManager:
         self.checksums[key] = checksum
         self._save_checksums()
         
-        logger.info(f"Stored checksum for {file_path.name}")
+        logger.info("Stored checksum for %s", file_path.name)
         return checksum
 
     def verify_checksum(
@@ -197,10 +204,10 @@ class FileIntegrityManager:
         if key in self.checksums:
             del self.checksums[key]
             self._save_checksums()
-            logger.info(f"Removed checksum for {file_path.name}")
+            logger.info("Removed checksum for %s", file_path.name)
             return True
         else:
-            logger.debug(f"No checksum found to remove for {file_path.name}")
+            logger.debug("No checksum found to remove for %s", file_path.name)
             return False
 
     def has_checksum(self, file_path: Path) -> bool:

src/server/api/anime.py

@@ -1,12 +1,15 @@
 import logging
 import warnings
+from pathlib import Path
 from typing import Any, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from pydantic import BaseModel, Field
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from src.config.settings import settings
 from src.core.entities.series import Serie
+from src.core.utils.key_utils import generate_key_from_folder, is_valid_key
 from src.server.database.service import AnimeSeriesService
 from src.server.exceptions import (
     BadRequestError,
@@ -14,11 +17,16 @@ from src.server.exceptions import (
     ServerError,
     ValidationError,
 )
+from src.server.models.anime import AnimeMetadataUpdate
 from src.server.services.anime_service import AnimeService, AnimeServiceError
 from src.server.services.background_loader_service import BackgroundLoaderService
+from src.server.services.scheduler.folder_rename_service import (
+    _scan_for_pre_existing_duplicates,
+)
 from src.server.utils.dependencies import (
     get_anime_service,
     get_background_loader_service,
+    get_database_session,
     get_optional_database_session,
     get_series_app,
     require_auth,
@@ -70,6 +78,100 @@ async def get_anime_status(
         ) from exc
 
 
+class DuplicateFolderGroup(BaseModel):
+    """A group of duplicate folders for the same series.
+
+    Attributes:
+        key: Series key (provider-assigned unique identifier)
+        folders: List of folder names that are duplicates
+        folder_count: Number of duplicate folders
+    """
+    key: str = Field(..., description="Series key (unique identifier)")
+    folders: List[str] = Field(..., description="List of duplicate folder names")
+    folder_count: int = Field(..., description="Number of duplicate folders")
+
+
+class DuplicateFoldersResponse(BaseModel):
+    """Response model for duplicate folders listing.
+
+    Attributes:
+        total_groups: Total number of duplicate groups found
+        duplicate_groups: List of duplicate folder groups
+        message: Human-readable summary
+    """
+    total_groups: int = Field(..., description="Total number of duplicate groups")
+    duplicate_groups: List[DuplicateFolderGroup] = Field(
+        ..., description="List of duplicate folder groups"
+    )
+    message: str = Field(..., description="Human-readable summary")
+
+
+@router.get("/duplicate-folders", response_model=DuplicateFoldersResponse)
+async def get_duplicate_folders(
+    _auth: dict = Depends(require_auth),
+) -> DuplicateFoldersResponse:
+    """List all pre-existing duplicate folder groups.
+
+    Scans the anime directory for folders with tvshow.nfo files that
+    map to the same series key. Returns groups of duplicates for
+    manual review and cleanup.
+
+    Returns:
+        DuplicateFoldersResponse with groups of duplicate folders
+
+    Note:
+        Not all duplicate folders are safe to merge - some may belong
+        to different releases (e.g., dubbed vs. subbed). Review carefully
+        before taking action.
+    """
+    try:
+        if not settings.anime_directory:
+            return DuplicateFoldersResponse(
+                total_groups=0,
+                duplicate_groups=[],
+                message="Anime directory not configured",
+            )
+
+        anime_dir = Path(settings.anime_directory)
+        if not anime_dir.is_dir():
+            return DuplicateFoldersResponse(
+                total_groups=0,
+                duplicate_groups=[],
+                message=f"Anime directory not found: {anime_dir}",
+            )
+
+        duplicates = _scan_for_pre_existing_duplicates(anime_dir)
+
+        groups = [
+            DuplicateFolderGroup(
+                key=dup.key,
+                folders=dup.folders,
+                folder_count=dup.count,
+            )
+            for dup in duplicates
+        ]
+
+        if groups:
+            message = (
+                f"Found {len(groups)} duplicate group(s). "
+                "Review carefully - some duplicates may be different releases "
+                "(e.g., dubbed vs. subbed)."
+            )
+        else:
+            message = "No duplicate folders found."
+
+        return DuplicateFoldersResponse(
+            total_groups=len(groups),
+            duplicate_groups=groups,
+            message=message,
+        )
+    except Exception as exc:
+        logger.error("Failed to scan for duplicate folders: %s", str(exc))
+        raise ServerError(
+            message=f"Failed to scan for duplicates: {str(exc)}"
+        ) from exc
+
+
 class AnimeSummary(BaseModel):
     """Summary of an anime series with missing episodes.
     
@@ -236,8 +338,8 @@ async def list_anime(
         sort_by: Optional sorting parameter. Allowed: title, id, name,
             missing_episodes
         filter: Optional filter parameter. Allowed values:
-            - "no_episodes": Show only series with no downloaded
-              episodes in folder
+            - "missing_episodes": Show only series that have any missing episodes
+            - "no_episodes": Show only series that have no downloaded episodes
         _auth: Ensures the caller is authenticated (value unused)
         anime_service: AnimeService instance provided via dependency
 
@@ -298,7 +400,7 @@ async def list_anime(
     # Validate filter parameter
     if filter:
         try:
-            allowed_filters = ["no_episodes"]
+            allowed_filters = ["missing_episodes", "no_episodes"]
             validate_filter_value(filter, allowed_filters)
         except ValueError as e:
             raise ValidationError(message=str(e))
@@ -724,13 +826,17 @@ async def add_series(
         if series_app and hasattr(series_app, 'loader'):
             try:
                 year = series_app.loader.get_year(key)
-                logger.info(f"Fetched year for {key}: {year}")
+                logger.info("Fetched year for %s: %s", key, year)
             except Exception as e:
-                logger.warning(f"Could not fetch year for {key}: {e}")
+                logger.warning("Could not fetch year for %s: %s", key, e)
         
         # Create folder name with year if available
         if year:
-            folder_name_with_year = f"{name} ({year})"
+            year_suffix = f" ({year})"
+            if name.endswith(year_suffix):
+                folder_name_with_year = name
+            else:
+                folder_name_with_year = f"{name}{year_suffix}"
         else:
             folder_name_with_year = name
         
@@ -834,9 +940,9 @@ async def add_series(
         # Step F: Scan missing episodes immediately if background loader is not running
         # Uses existing SerieScanner and AnimeService sync to avoid duplicates
         try:
-            loader_running = (
-                background_loader.worker_task is not None
-                and not background_loader.worker_task.done()
+            loader_running = bool(
+                background_loader.worker_tasks
+                and any(not t.done() for t in background_loader.worker_tasks)
             )
             if (
                 not loader_running
@@ -1084,3 +1190,75 @@ async def get_anime(
 # Maximum allowed input size for security
 MAX_INPUT_LENGTH = 100000  # 100KB
 
+
+@router.put("/{anime_key}")
+async def update_anime_metadata(
+    anime_key: str,
+    body: AnimeMetadataUpdate,
+    _auth: dict = Depends(require_auth),
+    db: AsyncSession = Depends(get_database_session),
+) -> dict:
+    """Update anime metadata (key, tmdb_id, tvdb_id).
+
+    Args:
+        anime_key: Current series key to update
+        body: Fields to update (all optional)
+        _auth: Authentication dependency
+        db: Database session
+
+    Returns:
+        Updated series metadata
+
+    Raises:
+        HTTPException 404: Series not found
+        HTTPException 409: Key conflict (new key already exists)
+        HTTPException 422: Validation error
+    """
+    series = await AnimeSeriesService.get_by_key(db, anime_key)
+    if not series:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Series with key '{anime_key}' not found",
+        )
+
+    updates = {}
+
+    if body.key is not None and body.key != anime_key:
+        existing = await AnimeSeriesService.get_by_key(db, body.key)
+        if existing:
+            raise HTTPException(
+                status_code=status.HTTP_409_CONFLICT,
+                detail=f"A series with key '{body.key}' already exists",
+            )
+        updates["key"] = body.key
+
+    if body.tmdb_id is not None:
+        updates["tmdb_id"] = body.tmdb_id
+
+    if body.tvdb_id is not None:
+        updates["tvdb_id"] = body.tvdb_id
+
+    if not updates:
+        return {
+            "key": series.key,
+            "tmdb_id": series.tmdb_id,
+            "tvdb_id": series.tvdb_id,
+            "message": "No changes",
+        }
+
+    updated = await AnimeSeriesService.update(db, series.id, **updates)
+    await db.commit()
+
+    logger.info(
+        "Updated metadata for '%s': %s",
+        anime_key,
+        updates,
+    )
+
+    return {
+        "key": updated.key,
+        "tmdb_id": updated.tmdb_id,
+        "tvdb_id": updated.tvdb_id,
+        "message": "Metadata updated successfully",
+    }
+

src/server/api/auth.py

@@ -76,6 +76,8 @@ async def setup_auth(req: SetupRequest):
             config.scheduler.schedule_days = req.scheduler_schedule_days
         if req.scheduler_auto_download_after_rescan is not None:
             config.scheduler.auto_download_after_rescan = req.scheduler_auto_download_after_rescan
+        if req.scheduler_folder_scan_enabled is not None:
+            config.scheduler.folder_scan_enabled = req.scheduler_folder_scan_enabled
         
         # Update logging configuration
         if req.logging_level:
@@ -161,6 +163,22 @@ async def setup_auth(req: SetupRequest):
                 # Perform NFO scan if configured
                 await perform_nfo_scan_if_needed(progress_service)
                 
+                # Start scheduler if anime_directory is now set
+                try:
+                    from src.server.services.scheduler.scheduler_service import (
+                        get_scheduler_service,
+                    )
+
+                    scheduler_svc = get_scheduler_service()
+                    logger.info("Starting scheduler after initialization")
+                    await scheduler_svc.ensure_started()
+                    logger.info("Scheduler started successfully during setup")
+                except Exception as sched_exc:
+                    logger.warning(
+                        "Failed to start scheduler during setup: %s", sched_exc
+                    )
+                    # Continue — scheduler failure should not break initialization
+                
                 # Send completion event
                 from src.server.services.progress_service import ProgressType
                 await progress_service.start_progress(

src/server/api/config.py

@@ -1,7 +1,10 @@
+import logging
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, status
 
+logger = logging.getLogger(__name__)
+
 from src.server.models.config import AppConfig, ConfigUpdate, ValidationResult
 from src.server.services.config_service import (
     ConfigBackupError,
@@ -28,16 +31,53 @@ def get_config(auth: Optional[dict] = Depends(require_auth)) -> AppConfig:
 
 
 @router.put("", response_model=AppConfig)
-def update_config(
+async def update_config(
     update: ConfigUpdate, auth: dict = Depends(require_auth)
 ) -> AppConfig:
     """Apply an update to the configuration and persist it.
 
-    Creates automatic backup before applying changes.
+    Creates automatic backup before applying changes. If anime_directory
+    is configured, starts the scheduler service.
     """
     try:
         config_service = get_config_service()
-        return config_service.update_config(update)
+        updated_config = config_service.update_config(update)
+
+        # Sync anime_directory to settings if it was updated
+        from src.config.settings import settings as app_settings
+
+        anime_dir_changed = False
+        if update.other and update.other.get("anime_directory"):
+            anime_dir = update.other.get("anime_directory")
+            if anime_dir and not app_settings.anime_directory:
+                app_settings.anime_directory = str(anime_dir)
+                anime_dir_changed = True
+                logger.info("Synced anime_directory from config: %s", anime_dir)
+
+        # Start scheduler if anime_directory was just configured
+        if anime_dir_changed:
+            try:
+                from src.server.services.scheduler.scheduler_service import (
+                    get_scheduler_service,
+                )
+
+                scheduler_svc = get_scheduler_service()
+                logger.info(
+                    "Starting scheduler after anime_directory configuration"
+                )
+                await scheduler_svc.ensure_started()
+                logger.info(
+                    "Scheduler started successfully after config update"
+                )
+            except Exception as sched_exc:
+                logger.warning(
+                    "Failed to start scheduler after config update: %s",
+                    sched_exc,
+                )
+                # Config was already saved, don't fail the request
+
+        return updated_config
+
     except ConfigValidationError as e:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
@@ -244,9 +284,9 @@ async def update_directory(
         try:
             import structlog
 
-            from src.server.services.anime_service import sync_series_from_data_files
+            from src.server.services.anime_service import sync_legacy_series_to_db
             logger = structlog.get_logger(__name__)
-            sync_count = await sync_series_from_data_files(directory, logger)
+            sync_count = await sync_legacy_series_to_db(directory, logger)
             logger.info(
                 "Directory updated: synced series from data files",
                 directory=directory,

src/server/api/health.py

@@ -5,7 +5,7 @@ from datetime import datetime
 from typing import Any, Dict, Optional
 
 import psutil
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Request
 from pydantic import BaseModel
 from sqlalchemy import text
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -17,15 +17,21 @@ logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/health", tags=["health"])
 
 
+from src.server.utils.version import APP_VERSION
+
+
 class HealthStatus(BaseModel):
     """Basic health status response."""
 
     status: str
     timestamp: str
-    version: str = "1.0.0"
+    version: str = APP_VERSION
     service: str = "aniworld-api"
     series_app_initialized: bool = False
     anime_directory_configured: bool = False
+    scheduler_next_run: Optional[str] = None
+    scheduler_last_run: Optional[str] = None
+    checks: Optional[Dict[str, Any]] = None
 
 
 class DatabaseHealth(BaseModel):
@@ -60,7 +66,7 @@ class DetailedHealthStatus(BaseModel):
 
     status: str
     timestamp: str
-    version: str = "1.0.0"
+    version: str = APP_VERSION
     dependencies: DependencyHealth
     startup_time: datetime
 
@@ -91,7 +97,7 @@ async def check_database_health(db: AsyncSession) -> DatabaseHealth:
             message="Database connection successful",
         )
     except Exception as e:
-        logger.error(f"Database health check failed: {e}")
+        logger.error("Database health check failed: %s", e)
         return DatabaseHealth(
             status="unhealthy",
             connection_time_ms=0,
@@ -121,7 +127,7 @@ async def check_filesystem_health() -> Dict[str, Any]:
             "message": "Filesystem check completed",
         }
     except Exception as e:
-        logger.error(f"Filesystem health check failed: {e}")
+        logger.error("Filesystem health check failed: %s", e)
         return {
             "status": "unhealthy",
             "message": f"Filesystem check failed: {str(e)}",
@@ -164,36 +170,99 @@ def get_system_metrics() -> SystemMetrics:
             uptime_seconds=uptime_seconds,
         )
     except Exception as e:
-        logger.error(f"System metrics collection failed: {e}")
+        logger.error("System metrics collection failed: %s", e)
         raise HTTPException(
             status_code=500, detail=f"Failed to collect system metrics: {str(e)}"
         )
 
 
 @router.get("", response_model=HealthStatus)
-async def basic_health_check() -> HealthStatus:
+async def basic_health_check(request: Request) -> HealthStatus:
     """Basic health check endpoint.
     
     This endpoint does not depend on anime_directory configuration
     and should always return 200 OK for basic health monitoring.
     Includes service information for identification.
+    Includes scheduler next/last run times for monitoring tools.
+    Includes startup health check results.
 
     Returns:
         HealthStatus: Simple health status with timestamp and service info.
     """
     from src.config.settings import settings
     from src.server.utils.dependencies import _series_app
+
+    # Get scheduler status for health monitoring
+    scheduler_status: dict = {}
+    try:
+        from src.server.services.scheduler.scheduler_service import (
+            get_scheduler_service,
+        )
+        scheduler_status = get_scheduler_service().get_status()
+    except Exception:
+        pass
+
+    # Get startup checks from app state
+    checks = getattr(request.app.state, "startup_checks", None)
+    
+    # Determine overall status based on checks
+    overall_status = "healthy"
+    if checks:
+        for check_name, check_data in checks.items():
+            if check_data.get("status") == "error":
+                overall_status = "unhealthy"
+                break
+            elif check_data.get("status") == "warning":
+                overall_status = "degraded"
     
     logger.debug("Basic health check requested")
     return HealthStatus(
-        status="healthy",
+        status=overall_status,
         timestamp=datetime.now().isoformat(),
         service="aniworld-api",
         series_app_initialized=_series_app is not None,
         anime_directory_configured=bool(settings.anime_directory),
+        scheduler_next_run=scheduler_status.get("next_run"),
+        scheduler_last_run=scheduler_status.get("last_run"),
+        checks=checks,
     )
 
 
+@router.get("/ready")
+async def ready_check(request: Request) -> Dict[str, Any]:
+    """Readiness check endpoint for container orchestrators.
+    
+    Returns 503 if critical dependencies are not available.
+    This endpoint is used by Kubernetes, Docker Swarm, etc. to determine
+    if the container should receive traffic.
+    
+    Returns:
+        dict: Readiness status with checks details.
+    """
+    checks = getattr(request.app.state, "startup_checks", {})
+    
+    critical_failures = []
+    for check_name, check_data in checks.items():
+        if check_data.get("status") == "error":
+            critical_failures.append(f"{check_name}: {check_data.get('message')}")
+    
+    if critical_failures:
+        return {
+            "status": "not_ready",
+            "ready": False,
+            "timestamp": datetime.now().isoformat(),
+            "critical_failures": critical_failures,
+            "checks": checks,
+        }
+    
+    return {
+        "status": "ready",
+        "ready": True,
+        "timestamp": datetime.now().isoformat(),
+        "checks": checks,
+    }
+
+
 @router.get("/detailed", response_model=DetailedHealthStatus)
 async def detailed_health_check(
     db: AsyncSession = Depends(get_database_session),
@@ -236,7 +305,7 @@ async def detailed_health_check(
             startup_time=startup_time,
         )
     except Exception as e:
-        logger.error(f"Detailed health check failed: {e}")
+        logger.error("Detailed health check failed: %s", e)
         raise HTTPException(status_code=500, detail="Health check failed")
 
 

src/server/api/nfo.py

@@ -16,6 +16,11 @@ from src.core.entities.series import Serie
 from src.core.SeriesApp import SeriesApp
 from src.core.services.nfo_factory import get_nfo_factory
 from src.core.services.nfo_service import NFOService
+from src.core.services.nfo_repair_service import (
+    REQUIRED_TAGS,
+    NfoRepairService,
+    find_missing_tags,
+)
 from src.core.services.tmdb_client import TMDBAPIError
 from src.server.models.nfo import (
     MediaDownloadRequest,
@@ -27,8 +32,10 @@ from src.server.models.nfo import (
     NFOContentResponse,
     NFOCreateRequest,
     NFOCreateResponse,
+    NfoDiagnosticsResponse,
     NFOMissingResponse,
     NFOMissingSeries,
+    NfoRepairResponse,
 )
 from src.server.utils.dependencies import get_series_app, require_auth
 from src.server.utils.media import check_media_files, get_media_file_paths
@@ -144,6 +151,27 @@ async def batch_create_nfo(
                     nfo_path=str(nfo_path)
                 )
                 
+            except TMDBAPIError as e:
+                logger.warning("TMDB API error for %s, creating minimal fallback: %s", serie_id, e)
+                # TMDB failed, create minimal NFO
+                try:
+                    serie_folder = serie.ensure_folder_with_year()
+                except Exception:
+                    serie_folder = serie_folder
+                
+                serie_name = serie.name or serie_folder
+                nfo_path = await nfo_service.create_minimal_nfo(
+                    serie_name=serie_name,
+                    serie_folder=serie_folder
+                )
+                
+                return NFOBatchResult(
+                    serie_id=serie_id,
+                    serie_folder=serie_folder,
+                    success=True,
+                    message="Created minimal NFO (TMDB lookup failed)",
+                    nfo_path=str(nfo_path)
+                )
             except Exception as e:
                 logger.error(
                     f"Error creating NFO for {serie_id}: {e}",
@@ -243,7 +271,7 @@ async def get_missing_nfo(
         )
         
     except Exception as e:
-        logger.error(f"Error getting missing NFOs: {e}", exc_info=True)
+        logger.exception("Error getting missing NFOs: %s", e)
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
             detail=f"Failed to get missing NFOs: {str(e)}"
@@ -334,7 +362,7 @@ async def check_nfo(
     except HTTPException:
         raise
     except Exception as e:
-        logger.error(f"Error checking NFO for {serie_id}: {e}", exc_info=True)
+        logger.exception("Error checking NFO for %s: %s", serie_id, e)
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
             detail=f"Failed to check NFO: {str(e)}"
@@ -429,11 +457,42 @@ async def create_nfo(
     except HTTPException:
         raise
     except TMDBAPIError as e:
-        logger.warning(f"TMDB API error creating NFO for {serie_id}: {e}")
-        raise HTTPException(
-            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
-            detail=f"TMDB API error: {str(e)}"
-        ) from e
+        logger.warning("TMDB API error for %s, creating minimal fallback: %s", serie_id, e)
+        # TMDB failed, create minimal NFO with just folder name
+        try:
+            serie_folder = serie.ensure_folder_with_year()
+        except Exception:
+            serie_folder = serie_folder
+        
+        folder_path = Path(settings.anime_directory) / serie_folder
+        serie_name_fallback = request.serie_name or serie.name or serie_folder
+        
+        nfo_path = await nfo_service.create_minimal_nfo(
+            serie_name=serie_name_fallback,
+            serie_folder=serie_folder,
+            year=year
+        )
+        
+        # Check media files (will likely be empty)
+        media_status = check_media_files(folder_path)
+        file_paths = get_media_file_paths(folder_path)
+        
+        media_files = MediaFilesStatus(
+            has_poster=media_status.get("poster", False),
+            has_logo=media_status.get("logo", False),
+            has_fanart=media_status.get("fanart", False),
+            poster_path=str(file_paths["poster"]) if file_paths.get("poster") else None,
+            logo_path=str(file_paths["logo"]) if file_paths.get("logo") else None,
+            fanart_path=str(file_paths["fanart"]) if file_paths.get("fanart") else None
+        )
+        
+        return NFOCreateResponse(
+            serie_id=serie_id,
+            serie_folder=serie_folder,
+            nfo_path=str(nfo_path),
+            media_files=media_files,
+            message="Created minimal NFO (TMDB lookup failed)"
+        )
     except Exception as e:
         logger.error(
             f"Error creating NFO for {serie_id}: {e}",
@@ -524,7 +583,7 @@ async def update_nfo(
     except HTTPException:
         raise
     except TMDBAPIError as e:
-        logger.warning(f"TMDB API error updating NFO for {serie_id}: {e}")
+        logger.warning("TMDB API error updating NFO for %s: %s", serie_id, e)
         raise HTTPException(
             status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
             detail=f"TMDB API error: {str(e)}"
@@ -756,3 +815,142 @@ async def download_media(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
             detail=f"Failed to download media: {str(e)}"
         ) from e
+
+
+@router.get("/{serie_key}/diagnostics", response_model=NfoDiagnosticsResponse)
+async def get_nfo_diagnostics(
+    serie_key: str,
+    _auth: dict = Depends(require_auth),
+    series_app: SeriesApp = Depends(get_series_app),
+) -> NfoDiagnosticsResponse:
+    """Get NFO diagnostics showing missing required tags.
+
+    Args:
+        serie_key: Series key identifier
+        _auth: Authentication dependency
+        series_app: SeriesApp instance
+
+    Returns:
+        NfoDiagnosticsResponse with has_nfo, missing_tags, required_tags
+
+    Raises:
+        HTTPException 404: Series not found
+    """
+    serie = None
+    for s in series_app.list.GetList():
+        if getattr(s, "key", None) == serie_key:
+            serie = s
+            break
+
+    if not serie:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Series with key '{serie_key}' not found",
+        )
+
+    serie_folder = serie.ensure_folder_with_year()
+    folder_path = Path(settings.anime_directory) / serie_folder
+    nfo_path = folder_path / "tvshow.nfo"
+
+    required_tag_names = list(REQUIRED_TAGS.values())
+
+    if not nfo_path.exists():
+        return NfoDiagnosticsResponse(
+            has_nfo=False,
+            nfo_path=None,
+            missing_tags=required_tag_names,
+            required_tags=required_tag_names,
+        )
+
+    missing = find_missing_tags(nfo_path)
+
+    return NfoDiagnosticsResponse(
+        has_nfo=True,
+        nfo_path=str(nfo_path),
+        missing_tags=missing,
+        required_tags=required_tag_names,
+    )
+
+
+@router.post("/{serie_key}/repair", response_model=NfoRepairResponse)
+async def repair_nfo(
+    serie_key: str,
+    _auth: dict = Depends(require_auth),
+    series_app: SeriesApp = Depends(get_series_app),
+    nfo_service: NFOService = Depends(get_nfo_service),
+) -> NfoRepairResponse:
+    """Repair or recreate NFO file for a series.
+
+    Detects missing required tags and re-fetches metadata from TMDB.
+
+    Args:
+        serie_key: Series key identifier
+        _auth: Authentication dependency
+        series_app: SeriesApp instance
+        nfo_service: NFO service for TMDB operations
+
+    Returns:
+        NfoRepairResponse with success status and details
+
+    Raises:
+        HTTPException 404: Series not found
+        HTTPException 400: Cannot repair (e.g., no TMDB data available)
+    """
+    serie = None
+    for s in series_app.list.GetList():
+        if getattr(s, "key", None) == serie_key:
+            serie = s
+            break
+
+    if not serie:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Series with key '{serie_key}' not found",
+        )
+
+    serie_folder = serie.ensure_folder_with_year()
+    folder_path = Path(settings.anime_directory) / serie_folder
+    nfo_path = folder_path / "tvshow.nfo"
+
+    # Get missing tags before repair for reporting
+    missing_before = find_missing_tags(nfo_path) if nfo_path.exists() else list(REQUIRED_TAGS.values())
+
+    try:
+        repair_service = NfoRepairService(nfo_service)
+
+        if nfo_path.exists():
+            repaired = await repair_service.repair_series(folder_path, serie_folder)
+            if not repaired:
+                return NfoRepairResponse(
+                    success=True,
+                    message="NFO is already complete, no repair needed",
+                    repaired_tags=[],
+                )
+        else:
+            # No NFO exists — create new one
+            await nfo_service.create_tvshow_nfo(
+                serie_name=serie.name,
+                serie_folder=serie_folder,
+                download_poster=True,
+                download_logo=True,
+                download_fanart=True,
+            )
+
+        return NfoRepairResponse(
+            success=True,
+            message=f"NFO repaired successfully. Fixed {len(missing_before)} missing tags.",
+            repaired_tags=missing_before,
+        )
+
+    except TMDBAPIError as e:
+        logger.warning("NFO repair failed for '%s': %s", serie_key, e)
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Cannot repair NFO: {str(e)}. Ensure TMDB ID is set.",
+        ) from e
+    except Exception as e:
+        logger.error("NFO repair error for '%s': %s", serie_key, e, exc_info=True)
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to repair NFO: {str(e)}",
+        ) from e

src/server/api/scheduler.py

@@ -10,7 +10,7 @@ from fastapi import APIRouter, Depends, HTTPException, status
 
 from src.server.models.config import SchedulerConfig
 from src.server.services.config_service import ConfigServiceError, get_config_service
-from src.server.services.scheduler_service import get_scheduler_service
+from src.server.services.scheduler.scheduler_service import get_scheduler_service
 from src.server.utils.dependencies import require_auth
 
 logger = logging.getLogger(__name__)
@@ -31,6 +31,7 @@ def _build_response(config: SchedulerConfig) -> Dict[str, Any]:
             "schedule_time": config.schedule_time,
             "schedule_days": config.schedule_days,
             "auto_download_after_rescan": config.auto_download_after_rescan,
+            "folder_scan_enabled": config.folder_scan_enabled,
         },
         "status": {
             "is_running": runtime.get("is_running", False),

src/server/config/__init__.py

@@ -39,7 +39,7 @@ def get_settings() -> Union[DevelopmentSettings, ProductionSettings]:
     Example:
         >>> settings = get_settings()
         >>> print(settings.log_level)
-        DEBUG
+        INFO
     """
     if ENVIRONMENT in {"development", "testing"}:
         return get_development_settings()

src/server/config/development.py

@@ -215,7 +215,7 @@ class DevelopmentSettings(BaseSettings):
     @property
     def debug_enabled(self) -> bool:
         """Check if debug mode is enabled."""
-        return True
+        return False
 
     @property
     def reload_enabled(self) -> bool:

src/server/config/logging_config.py

@@ -95,10 +95,10 @@ def setup_logging() -> Dict[str, logging.Logger]:
     # Log initial setup
     root_logger.info("=" * 80)
     root_logger.info("FastAPI Server Logging Initialized")
-    root_logger.info(f"Log Level: {settings.log_level.upper()}")
-    root_logger.info(f"Server Log: {server_log_file.absolute()}")
-    root_logger.info(f"Error Log: {error_log_file.absolute()}")
-    root_logger.info(f"Access Log: {access_log_file.absolute()}")
+    root_logger.info("Log Level: %s", settings.log_level.upper())
+    root_logger.info("Server Log: %s", server_log_file.absolute())
+    root_logger.info("Error Log: %s", error_log_file.absolute())
+    root_logger.info("Access Log: %s", access_log_file.absolute())
     root_logger.info("=" * 80)
     
     return {

src/server/database/connection.py

@@ -88,7 +88,7 @@ async def init_db() -> None:
     try:
         # Get database URL
         db_url = _get_database_url()
-        logger.info(f"Initializing database: {db_url}")
+        logger.info("Initializing database: %s", db_url)
         
         # Build engine kwargs based on database type
         is_sqlite = "sqlite" in db_url
@@ -143,7 +143,7 @@ async def init_db() -> None:
         logger.info("Database initialization complete")
         
     except Exception as e:
-        logger.error(f"Failed to initialize database: {e}")
+        logger.error("Failed to initialize database: %s", e)
         raise
 
 
@@ -171,7 +171,7 @@ async def close_db() -> None:
                     conn.commit()
                 logger.info("SQLite WAL checkpoint completed")
             except Exception as e:
-                logger.warning(f"WAL checkpoint failed (non-critical): {e}")
+                logger.warning("WAL checkpoint failed (non-critical): %s", e)
         
         if _engine:
             logger.info("Closing async database engine...")
@@ -188,7 +188,7 @@ async def close_db() -> None:
         logger.info("Database connections closed")
         
     except Exception as e:
-        logger.error(f"Error closing database: {e}")
+        logger.error("Error closing database: %s", e)
 
 
 def get_engine() -> AsyncEngine:

src/server/database/init.py

@@ -27,7 +27,7 @@ logger = logging.getLogger(__name__)
 # Schema Version Constants
 # =============================================================================
 
-CURRENT_SCHEMA_VERSION = "1.0.0"
+CURRENT_SCHEMA_VERSION = "1.0.1"
 SCHEMA_VERSION_TABLE = "schema_version"
 
 # Expected tables in the current schema
@@ -98,7 +98,7 @@ async def initialize_database(
             seed_data=True
         )
         if result["success"]:
-            logger.info(f"Database initialized: {result['schema_version']}")
+            logger.info("Database initialized: %s", result['schema_version'])
     """
     if engine is None:
         engine = get_engine()
@@ -117,7 +117,12 @@ async def initialize_database(
         if create_schema:
             tables = await create_database_schema(engine)
             result["tables_created"] = tables
-            logger.info(f"Created {len(tables)} tables")
+            logger.info("Created %s tables", len(tables))
+        
+        # Migrate schema if needed (add missing columns to existing tables)
+        migrations = await migrate_schema_if_needed(engine)
+        if migrations:
+            logger.info("Applied %s schema migrations", len(migrations))
         
         # Validate schema if requested
         if validate_schema:
@@ -148,7 +153,7 @@ async def initialize_database(
         return result
         
     except Exception as e:
-        logger.error(f"Database initialization failed: {e}", exc_info=True)
+        logger.exception("Database initialization failed: %s", e)
         raise RuntimeError(f"Failed to initialize database: {e}") from e
 
 
@@ -194,14 +199,14 @@ async def create_database_schema(
         created_tables = [t for t in new_tables if t not in existing_tables]
         
         if created_tables:
-            logger.info(f"Created tables: {', '.join(created_tables)}")
+            logger.info("Created tables: %s", ', '.join(created_tables))
         else:
             logger.info("All tables already exist")
         
         return new_tables
         
     except Exception as e:
-        logger.error(f"Failed to create schema: {e}", exc_info=True)
+        logger.exception("Failed to create schema: %s", e)
         raise RuntimeError(f"Schema creation failed: {e}") from e
 
 
@@ -295,7 +300,7 @@ async def validate_database_schema(
         return result
         
     except Exception as e:
-        logger.error(f"Schema validation failed: {e}", exc_info=True)
+        logger.exception("Schema validation failed: %s", e)
         return {
             "valid": False,
             "missing_tables": [],
@@ -305,6 +310,66 @@ async def validate_database_schema(
         }
 
 
+# =============================================================================
+# Schema Migration
+# =============================================================================
+
+
+async def migrate_schema_if_needed(
+    engine: Optional[AsyncEngine] = None
+) -> List[str]:
+    """Migrate database schema to current version if needed.
+    
+    Handles adding missing columns to existing tables for backward
+    compatibility with older database schemas.
+    
+    Args:
+        engine: Optional database engine (uses default if not provided)
+    
+    Returns:
+        List of migration operations performed
+    """
+    if engine is None:
+        engine = get_engine()
+    
+    migrations_applied = []
+    
+    try:
+        async with engine.connect() as conn:
+            # Get existing columns in system_settings table
+            existing_columns = await conn.run_sync(
+                lambda sync_conn: [
+                    col["name"]
+                    for col in inspect(sync_conn).get_columns("system_settings")
+                ]
+            )
+            
+            # Migration: Add legacy_key_cleanup_completed column if missing
+            if "legacy_key_cleanup_completed" not in existing_columns:
+                logger.info(
+                    "Migrating system_settings table: "
+                    "adding legacy_key_cleanup_completed column"
+                )
+                await conn.execute(
+                    text("""
+                        ALTER TABLE system_settings
+                        ADD COLUMN legacy_key_cleanup_completed BOOLEAN
+                        NOT NULL DEFAULT 0
+                    """)
+                )
+                migrations_applied.append("added legacy_key_cleanup_completed")
+                logger.info(
+                    "Migration complete: added legacy_key_cleanup_completed column"
+                )
+    
+    except Exception as e:
+        logger.error("Schema migration failed: %s", e)
+        # Don't raise - migration failures shouldn't block startup
+        # The missing column will be handled gracefully by the application
+    
+    return migrations_applied
+
+
 # =============================================================================
 # Schema Version Management
 # =============================================================================
@@ -319,7 +384,7 @@ async def get_schema_version(engine: Optional[AsyncEngine] = None) -> str:
         engine: Optional database engine (uses default if not provided)
     
     Returns:
-        Schema version string (e.g., "1.0.0", "empty", "unknown")
+        Schema version string (e.g., "1.0.1", "empty", "unknown")
     """
     if engine is None:
         engine = get_engine()
@@ -342,7 +407,7 @@ async def get_schema_version(engine: Optional[AsyncEngine] = None) -> str:
                 return "unknown"
                 
     except Exception as e:
-        logger.error(f"Failed to get schema version: {e}")
+        logger.error("Failed to get schema version: %s", e)
         return "error"
 
 
@@ -409,7 +474,7 @@ async def seed_initial_data(engine: Optional[AsyncEngine] = None) -> None:
             logger.info("Data will be populated via normal application usage")
             
     except Exception as e:
-        logger.error(f"Failed to seed initial data: {e}", exc_info=True)
+        logger.exception("Failed to seed initial data: %s", e)
         raise
 
 
@@ -484,12 +549,12 @@ async def check_database_health(
                 f"(connectivity: {result['connectivity_ms']}ms)"
             )
         else:
-            logger.warning(f"Database health issues: {result['issues']}")
+            logger.warning("Database health issues: %s", result['issues'])
         
         return result
         
     except Exception as e:
-        logger.error(f"Database health check failed: {e}")
+        logger.error("Database health check failed: %s", e)
         return {
             "healthy": False,
             "accessible": False,
@@ -547,13 +612,13 @@ async def create_database_backup(
         backup_path = backup_dir / f"aniworld_{timestamp}.db"
     
     try:
-        logger.info(f"Creating database backup: {backup_path}")
+        logger.info("Creating database backup: %s", backup_path)
         shutil.copy2(db_path, backup_path)
-        logger.info(f"Backup created successfully: {backup_path}")
+        logger.info("Backup created successfully: %s", backup_path)
         return backup_path
         
     except Exception as e:
-        logger.error(f"Failed to create backup: {e}", exc_info=True)
+        logger.exception("Failed to create backup: %s", e)
         raise RuntimeError(f"Backup creation failed: {e}") from e
 
 

src/server/database/models.py

@@ -15,7 +15,7 @@ from datetime import datetime, timezone
 from enum import Enum
 from typing import List, Optional
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text, func
+from sqlalchemy import Boolean, DateTime, ForeignKey, Index, Integer, String, Text, func
 from sqlalchemy.orm import Mapped, mapped_column, relationship, validates
 
 from src.server.database.base import Base, TimestampMixin
@@ -83,6 +83,10 @@ class AnimeSeries(Base, TimestampMixin):
         Boolean, nullable=False, default=False, server_default="0",
         doc="Whether tvshow.nfo file exists for this series"
     )
+    nfo_path: Mapped[Optional[str]] = mapped_column(
+        String(1000), nullable=True,
+        doc="Path to the tvshow.nfo metadata file"
+    )
     nfo_created_at: Mapped[Optional[datetime]] = mapped_column(
         DateTime(timezone=True), nullable=True,
         doc="Timestamp when NFO was first created"
@@ -91,6 +95,7 @@ class AnimeSeries(Base, TimestampMixin):
         DateTime(timezone=True), nullable=True,
         doc="Timestamp when NFO was last updated"
     )
+    # TMDB (The Movie Database) ID for series metadata
     tmdb_id: Mapped[Optional[int]] = mapped_column(
         Integer, nullable=True, index=True,
         doc="TMDB (The Movie Database) ID for series metadata"
@@ -316,6 +321,7 @@ class DownloadQueueItem(Base, TimestampMixin):
         id: Primary key
         series_id: Foreign key to AnimeSeries
         episode_id: Foreign key to Episode
+        status: Queue status (pending/downloading/completed/failed/permanently_failed)
         error_message: Error description if failed
         download_url: Provider download URL
         file_destination: Target file path
@@ -347,6 +353,33 @@ class DownloadQueueItem(Base, TimestampMixin):
         index=True
     )
     
+    # Status column to track queue item state
+    # Allows distinguishing pending items from permanently failed ones
+    status: Mapped[str] = mapped_column(
+        String(50), nullable=False, default="pending",
+        doc="Queue item status: pending, downloading, completed, failed, permanently_failed"
+    )
+    
+    # Retry count to track failed download attempts
+    # Used to determine when to move item to permanently_failed
+    retry_count: Mapped[int] = mapped_column(
+        Integer, nullable=False, default=0,
+        doc="Number of retry attempts for this download"
+    )
+    
+    # Unique constraint to prevent duplicate pending queue items per episode
+    # An episode can only have one PENDING entry at a time
+    # The status column allows failed items to remain in DB while new
+    # pending items can be added (application-level dedup still required)
+    __table_args__ = (
+        Index(
+            "ix_download_queue_episode_status",
+            "episode_id",
+            "status",
+            unique=True,
+        ),
+    )
+    
     # Error handling
     error_message: Mapped[Optional[str]] = mapped_column(
         Text, nullable=True,
@@ -580,6 +613,14 @@ class SystemSettings(Base, TimestampMixin):
         Boolean, nullable=False, default=False, server_default="0",
         doc="Whether the initial media scan has been completed"
     )
+    migration_legacy_files_completed: Mapped[bool] = mapped_column(
+        Boolean, nullable=False, default=False, server_default="0",
+        doc="Whether legacy key/data file migration has been completed"
+    )
+    legacy_key_cleanup_completed: Mapped[bool] = mapped_column(
+        Boolean, nullable=False, default=False, server_default="0",
+        doc="Whether legacy key file cleanup has been completed"
+    )
     last_scan_timestamp: Mapped[Optional[datetime]] = mapped_column(
         DateTime(timezone=True), nullable=True,
         doc="Timestamp of the last completed scan"

src/server/database/service.py

@@ -107,7 +107,7 @@ class AnimeSeriesService:
         db.add(series)
         await db.flush()
         await db.refresh(series)
-        logger.info(f"Created anime series: {series.name} (key={series.key}, year={year})")
+        logger.info("Created anime series: %s (key=%s, year=%s)", series.name, series.key, year)
         return series
     
     @staticmethod
@@ -148,7 +148,47 @@ class AnimeSeriesService:
             select(AnimeSeries).where(AnimeSeries.key == key)
         )
         return result.scalar_one_or_none()
-    
+
+    @staticmethod
+    def get_by_folder_sync(db: Session, folder: str) -> Optional[AnimeSeries]:
+        """Look up an anime series by its filesystem folder name (sync).
+
+        Intended as a fallback for ``SerieScanner`` when neither a ``key``
+        file nor a ``data`` file exists on disk for a given folder.
+
+        Args:
+            db: Synchronous database session (from ``get_sync_session``).
+            folder: Filesystem folder name to match (e.g.
+                ``"Rooster Fighter (2026)"``).
+
+        Returns:
+            ``AnimeSeries`` instance or ``None`` if not found.
+        """
+        result = db.execute(
+            select(AnimeSeries).where(AnimeSeries.folder == folder)
+        )
+        return result.scalar_one_or_none()
+
+    @staticmethod
+    async def get_by_folder(db: AsyncSession, folder: str) -> Optional[AnimeSeries]:
+        """Look up an anime series by its filesystem folder name (async).
+
+        Intended as primary lookup for ``SerieScanner`` when scanning
+        directories, replacing the legacy file-based lookups (key/data files).
+
+        Args:
+            db: Async database session.
+            folder: Filesystem folder name to match (e.g.
+                ``"Rooster Fighter (2026)"``).
+
+        Returns:
+            ``AnimeSeries`` instance or ``None`` if not found.
+        """
+        result = await db.execute(
+            select(AnimeSeries).where(AnimeSeries.folder == folder)
+        )
+        return result.scalar_one_or_none()
+
     @staticmethod
     async def get_all(
         db: AsyncSession,
@@ -205,7 +245,7 @@ class AnimeSeriesService:
         
         await db.flush()
         await db.refresh(series)
-        logger.info(f"Updated anime series: {series.name} (id={series_id})")
+        logger.info("Updated anime series: %s (id=%s)", series.name, series_id)
         return series
     
     @staticmethod
@@ -226,7 +266,7 @@ class AnimeSeriesService:
         )
         deleted = result.rowcount > 0
         if deleted:
-            logger.info(f"Deleted anime series with id={series_id}")
+            logger.info("Deleted anime series with id=%s", series_id)
         return deleted
     
     @staticmethod
@@ -253,48 +293,92 @@ class AnimeSeriesService:
         return list(result.scalars().all())
     
     @staticmethod
-    async def get_series_with_no_episodes(
+    async def get_series_with_missing_episodes(
         db: AsyncSession,
         limit: Optional[int] = None,
         offset: int = 0,
     ) -> List[AnimeSeries]:
-        """Get anime series that have no episodes found in folder.
-        
-        Since episodes in the database represent MISSING episodes
-        (from episodeDict), this returns series that have episodes
-        in the DB with is_downloaded=False, meaning they have missing
-        episodes and no files were found in the folder for those episodes.
-        
-        Returns series where:
-        - At least one episode exists in database with is_downloaded=False
-        
+        """Get anime series that currently have missing episodes.
+
+        Episodes in the database represent missing episodes (from episodeDict).
+        This returns series that have at least one missing episode recorded in
+        the database (is_downloaded=False).
+
         Args:
             db: Database session
             limit: Optional limit for results
             offset: Offset for pagination
-        
+
         Returns:
-            List of AnimeSeries with missing episodes (not in folder)
+            List of AnimeSeries that have missing episodes.
         """
-        # Subquery to find series IDs with at least one undownloaded episode
-        undownloaded_series_ids = (
+        # Subquery to find series IDs with at least one missing episode
+        missing_series_ids = (
             select(Episode.series_id)
             .where(Episode.is_downloaded == False)
             .distinct()
             .subquery()
         )
-        
-        # Select series that have undownloaded episodes
+
         query = (
             select(AnimeSeries)
-            .where(AnimeSeries.id.in_(select(undownloaded_series_ids.c.series_id)))
+            .where(AnimeSeries.id.in_(select(missing_series_ids.c.series_id)))
             .order_by(AnimeSeries.name)
             .offset(offset)
         )
-        
+
         if limit:
             query = query.limit(limit)
-        
+
+        result = await db.execute(query)
+        return list(result.scalars().all())
+
+    @staticmethod
+    async def get_series_with_no_episodes(
+        db: AsyncSession,
+        limit: Optional[int] = None,
+        offset: int = 0,
+    ) -> List[AnimeSeries]:
+        """Get anime series that have no downloaded episodes.
+
+        A series has "no episodes" if it has at least one missing episode
+        (is_downloaded=False) and no downloaded episodes (is_downloaded=True).
+
+        Args:
+            db: Database session
+            limit: Optional limit for results
+            offset: Offset for pagination
+
+        Returns:
+            List of AnimeSeries where no episodes are downloaded.
+        """
+        # Series with missing episodes
+        missing_series_ids = (
+            select(Episode.series_id)
+            .where(Episode.is_downloaded == False)
+            .distinct()
+            .subquery()
+        )
+
+        # Series with any downloaded episodes
+        downloaded_series_ids = (
+            select(Episode.series_id)
+            .where(Episode.is_downloaded == True)
+            .distinct()
+            .subquery()
+        )
+
+        query = (
+            select(AnimeSeries)
+            .where(AnimeSeries.id.in_(select(missing_series_ids.c.series_id)))
+            .where(~AnimeSeries.id.in_(select(downloaded_series_ids.c.series_id)))
+            .order_by(AnimeSeries.name)
+            .offset(offset)
+        )
+
+        if limit:
+            query = query.limit(limit)
+
         result = await db.execute(query)
         return list(result.scalars().all())
     
@@ -477,6 +561,7 @@ class EpisodeService:
         db: AsyncSession,
         series_id: int,
         season: Optional[int] = None,
+        only_missing: bool = False,
     ) -> List[Episode]:
         """Get episodes for a series.
         
@@ -484,6 +569,9 @@ class EpisodeService:
             db: Database session
             series_id: Foreign key to AnimeSeries
             season: Optional season filter
+            only_missing: If True, only return episodes where
+                is_downloaded is False (i.e., missing episodes).
+                Default False returns all episodes.
         
         Returns:
             List of Episode instances
@@ -493,6 +581,9 @@ class EpisodeService:
         if season is not None:
             query = query.where(Episode.season == season)
         
+        if only_missing:
+            query = query.where(Episode.is_downloaded == False)
+        
         query = query.order_by(Episode.season, Episode.episode_number)
         result = await db.execute(query)
         return list(result.scalars().all())
@@ -558,11 +649,11 @@ class EpisodeService:
     @staticmethod
     async def delete(db: AsyncSession, episode_id: int) -> bool:
         """Delete episode.
-        
+
         Args:
             db: Database session
             episode_id: Episode primary key
-        
+
         Returns:
             True if deleted, False if not found
         """
@@ -571,6 +662,33 @@ class EpisodeService:
         )
         return result.rowcount > 0
 
+    @staticmethod
+    async def delete_by_series(
+        db: AsyncSession,
+        series_id: int,
+        season: int,
+        episode_number: int,
+    ) -> bool:
+        """Delete episode by series ID, season, and episode number.
+
+        Args:
+            db: Database session
+            series_id: Foreign key to AnimeSeries
+            season: Season number
+            episode_number: Episode number within season
+
+        Returns:
+            True if deleted, False if not found
+        """
+        result = await db.execute(
+            delete(Episode).where(
+                Episode.series_id == series_id,
+                Episode.season == season,
+                Episode.episode_number == episode_number,
+            )
+        )
+        return result.rowcount > 0
+
     @staticmethod
     async def delete_by_series_and_episode(
         db: AsyncSession,
@@ -657,7 +775,7 @@ class EpisodeService:
                 updated_count += 1
         
         await db.flush()
-        logger.info(f"Bulk marked {updated_count} episodes as downloaded")
+        logger.info("Bulk marked %s episodes as downloaded", updated_count)
         
         return updated_count
 
@@ -684,6 +802,8 @@ class DownloadQueueService:
         episode_id: int,
         download_url: Optional[str] = None,
         file_destination: Optional[str] = None,
+        status: str = "pending",
+        retry_count: int = 0,
     ) -> DownloadQueueItem:
         """Add item to download queue.
         
@@ -693,6 +813,8 @@ class DownloadQueueService:
             episode_id: Foreign key to Episode
             download_url: Optional provider download URL
             file_destination: Optional target file path
+            status: Queue item status (default: "pending")
+            retry_count: Number of retry attempts (default: 0)
         
         Returns:
             Created DownloadQueueItem instance
@@ -702,13 +824,15 @@ class DownloadQueueService:
             episode_id=episode_id,
             download_url=download_url,
             file_destination=file_destination,
+            status=status,
+            retry_count=retry_count,
         )
         db.add(item)
         await db.flush()
         await db.refresh(item)
         logger.info(
             f"Added to download queue: episode_id={episode_id} "
-            f"for series_id={series_id}"
+            f"for series_id={series_id}, status={status}"
         )
         return item
     
@@ -735,21 +859,24 @@ class DownloadQueueService:
     async def get_by_episode(
         db: AsyncSession,
         episode_id: int,
+        status_filter: Optional[str] = None,
     ) -> Optional[DownloadQueueItem]:
         """Get download queue item by episode ID.
         
         Args:
             db: Database session
             episode_id: Foreign key to Episode
+            status_filter: Optional status to filter by (e.g., "pending")
         
         Returns:
             DownloadQueueItem instance or None if not found
         """
-        result = await db.execute(
-            select(DownloadQueueItem).where(
-                DownloadQueueItem.episode_id == episode_id
-            )
+        query = select(DownloadQueueItem).where(
+            DownloadQueueItem.episode_id == episode_id
         )
+        if status_filter:
+            query = query.where(DownloadQueueItem.status == status_filter)
+        result = await db.execute(query)
         return result.scalar_one_or_none()
     
     @staticmethod
@@ -806,7 +933,96 @@ class DownloadQueueService:
         
         await db.flush()
         await db.refresh(item)
-        logger.debug(f"Set error on download queue item {item_id}")
+        logger.debug("Set error on download queue item %s", item_id)
+        return item
+    
+    @staticmethod
+    async def set_status(
+        db: AsyncSession,
+        item_id: int,
+        status: str,
+    ) -> Optional[DownloadQueueItem]:
+        """Set status on download queue item.
+        
+        Args:
+            db: Database session
+            item_id: Item primary key
+            status: New status value
+        
+        Returns:
+            Updated DownloadQueueItem instance or None if not found
+        """
+        item = await DownloadQueueService.get_by_id(db, item_id)
+        if not item:
+            return None
+        
+        item.status = status
+        
+        await db.flush()
+        await db.refresh(item)
+        logger.debug("Set status on download queue item %s to %s", item_id, status)
+        return item
+    
+    @staticmethod
+    async def increment_retry_count(
+        db: AsyncSession,
+        item_id: int,
+    ) -> Optional[DownloadQueueItem]:
+        """Increment retry count on download queue item.
+        
+        Args:
+            db: Database session
+            item_id: Item primary key
+        
+        Returns:
+            Updated DownloadQueueItem instance or None if not found
+        """
+        item = await DownloadQueueService.get_by_id(db, item_id)
+        if not item:
+            return None
+        
+        item.retry_count += 1
+        
+        await db.flush()
+        await db.refresh(item)
+        logger.debug(
+            "Incremented retry count on download queue item %s to %s",
+            item_id, item.retry_count
+        )
+        return item
+    
+    @staticmethod
+    async def set_status_and_error(
+        db: AsyncSession,
+        item_id: int,
+        status: str,
+        error_message: Optional[str] = None,
+    ) -> Optional[DownloadQueueItem]:
+        """Set status and error message on download queue item atomically.
+        
+        Args:
+            db: Database session
+            item_id: Item primary key
+            status: New status value
+            error_message: Optional error description
+        
+        Returns:
+            Updated DownloadQueueItem instance or None if not found
+        """
+        item = await DownloadQueueService.get_by_id(db, item_id)
+        if not item:
+            return None
+        
+        item.status = status
+        if error_message is not None:
+            item.error_message = error_message
+        
+        await db.flush()
+        await db.refresh(item)
+        logger.debug(
+            "Set status=%s on download queue item %s, error=%s",
+            status, item_id, error_message
+        )
         return item
     
     @staticmethod
@@ -825,7 +1041,7 @@ class DownloadQueueService:
         )
         deleted = result.rowcount > 0
         if deleted:
-            logger.info(f"Deleted download queue item with id={item_id}")
+            logger.info("Deleted download queue item with id=%s", item_id)
         return deleted
     
     @staticmethod
@@ -887,7 +1103,7 @@ class DownloadQueueService:
         )
         
         count = result.rowcount
-        logger.info(f"Bulk deleted {count} download queue items")
+        logger.info("Bulk deleted %s download queue items", count)
         
         return count
 
@@ -908,7 +1124,7 @@ class DownloadQueueService:
         """
         result = await db.execute(delete(DownloadQueueItem))
         count = result.rowcount
-        logger.info(f"Cleared all {count} download queue items")
+        logger.info("Cleared all %s download queue items", count)
         return count
 
 
@@ -962,7 +1178,7 @@ class UserSessionService:
         db.add(session)
         await db.flush()
         await db.refresh(session)
-        logger.info(f"Created user session: {session_id}")
+        logger.info("Created user session: %s", session_id)
         return session
     
     @staticmethod
@@ -1049,7 +1265,7 @@ class UserSessionService:
         
         session.revoke()
         await db.flush()
-        logger.info(f"Revoked user session: {session_id}")
+        logger.info("Revoked user session: %s", session_id)
         return True
     
     @staticmethod
@@ -1071,7 +1287,7 @@ class UserSessionService:
             )
         )
         count = result.rowcount
-        logger.info(f"Cleaned up {count} expired sessions")
+        logger.info("Cleaned up %s expired sessions", count)
         return count
 
     @staticmethod

src/server/database/system_settings_service.py

@@ -125,6 +125,66 @@ class SystemSettingsService:
         settings = await SystemSettingsService.get_or_create(db)
         return settings.initial_media_scan_completed
 
+    @staticmethod
+    async def is_migration_legacy_files_completed(db: AsyncSession) -> bool:
+        """Check if legacy key/data file migration has been completed.
+        
+        Args:
+            db: Database session
+            
+        Returns:
+            True if legacy migration is completed, False otherwise
+        """
+        settings = await SystemSettingsService.get_or_create(db)
+        return settings.migration_legacy_files_completed
+
+    @staticmethod
+    async def mark_migration_legacy_files_completed(
+        db: AsyncSession,
+        timestamp: Optional[datetime] = None
+    ) -> None:
+        """Mark the legacy key/data file migration as completed.
+        
+        Args:
+            db: Database session
+            timestamp: Optional timestamp to set, defaults to current time
+        """
+        settings = await SystemSettingsService.get_or_create(db)
+        settings.migration_legacy_files_completed = True
+        settings.last_scan_timestamp = timestamp or datetime.now(timezone.utc)
+        await db.commit()
+        logger.info("Marked legacy files migration as completed")
+
+    @staticmethod
+    async def is_legacy_key_cleanup_completed(db: AsyncSession) -> bool:
+        """Check if legacy key file cleanup has been completed.
+
+        Args:
+            db: Database session
+
+        Returns:
+            True if cleanup is completed, False otherwise
+        """
+        settings = await SystemSettingsService.get_or_create(db)
+        return settings.legacy_key_cleanup_completed
+
+    @staticmethod
+    async def mark_legacy_key_cleanup_completed(
+        db: AsyncSession,
+        timestamp: Optional[datetime] = None
+    ) -> None:
+        """Mark the legacy key file cleanup as completed.
+
+        Args:
+            db: Database session
+            timestamp: Optional timestamp to set, defaults to current time
+        """
+        settings = await SystemSettingsService.get_or_create(db)
+        settings.legacy_key_cleanup_completed = True
+        settings.last_scan_timestamp = timestamp or datetime.now(timezone.utc)
+        await db.commit()
+        logger.info("Marked legacy key file cleanup as completed")
+
     @staticmethod
     async def mark_initial_media_scan_completed(
         db: AsyncSession,
@@ -154,6 +214,8 @@ class SystemSettingsService:
         settings.initial_scan_completed = False
         settings.initial_nfo_scan_completed = False
         settings.initial_media_scan_completed = False
+        settings.migration_legacy_files_completed = False
+        settings.legacy_key_cleanup_completed = False
         settings.last_scan_timestamp = None
         await db.commit()
         logger.info("Reset all scan completion flags")

src/server/fastapi_app.py

@@ -6,6 +6,7 @@ configuration, middleware setup, static file serving, and Jinja2 template
 integration.
 """
 import asyncio
+import logging
 from contextlib import asynccontextmanager
 from pathlib import Path
 
@@ -37,7 +38,6 @@ from src.server.controllers.page_controller import router as page_router
 from src.server.middleware.auth import AuthMiddleware
 from src.server.middleware.error_handler import register_exception_handlers
 from src.server.middleware.setup_redirect import SetupRedirectMiddleware
-from src.server.services.anime_service import sync_series_from_data_files
 from src.server.services.progress_service import get_progress_service
 from src.server.services.websocket_service import get_websocket_service
 
@@ -51,7 +51,7 @@ async def _check_incomplete_series_on_startup(background_loader) -> None:
     Args:
         background_loader: BackgroundLoaderService instance
     """
-    logger = setup_logging(log_level="INFO")
+    logger = logging.getLogger("aniworld")
     
     try:
         from src.server.database.connection import get_db_session
@@ -96,11 +96,112 @@ async def _check_incomplete_series_on_startup(background_loader) -> None:
                 else:
                     logger.info("All series data is complete. No background loading needed.")
                 
-            except Exception as e:
-                logger.error(f"Error checking incomplete series: {e}", exc_info=True)
+            except Exception:
+                logger.exception("Error checking incomplete series")
             
+    except Exception:
+        logger.exception("Failed to check incomplete series on startup")
+
+
+async def _run_startup_health_checks(logger) -> dict:
+    """Run startup health checks for critical dependencies.
+    
+    Checks:
+    - ffmpeg availability
+    - DNS resolution for aniworld.to and api.themoviedb.org
+    - anime_directory configuration and writability
+    
+    Args:
+        logger: Logger instance for recording check results.
+        
+    Returns:
+        dict: Health check results with status and details for each check.
+    """
+    import asyncio
+    import shutil
+    import socket
+    from typing import Any, Dict
+    
+    checks: Dict[str, Any] = {
+        "ffmpeg": {"status": "unknown", "message": None},
+        "dns_aniworld": {"status": "unknown", "message": None},
+        "dns_tmdb": {"status": "unknown", "message": None},
+        "anime_directory": {"status": "unknown", "message": None, "path": None},
+    }
+    
+    # Check ffmpeg availability
+    try:
+        ffmpeg_path = shutil.which("ffmpeg")
+        if ffmpeg_path:
+            checks["ffmpeg"]["status"] = "ok"
+            checks["ffmpeg"]["message"] = f"Found at {ffmpeg_path}"
+            logger.debug("ffmpeg health check passed: %s", ffmpeg_path)
+        else:
+            checks["ffmpeg"]["status"] = "warning"
+            checks["ffmpeg"]["message"] = "ffmpeg not found in PATH"
+            logger.warning("ffmpeg health check failed: not in PATH")
     except Exception as e:
-        logger.error(f"Failed to check incomplete series on startup: {e}", exc_info=True)
+        checks["ffmpeg"]["status"] = "error"
+        checks["ffmpeg"]["message"] = str(e)
+        logger.warning("Could not check ffmpeg: %s", e)
+    
+    # Check DNS resolution for aniworld.to
+    try:
+        socket.gethostbyname("aniworld.to")
+        checks["dns_aniworld"]["status"] = "ok"
+        checks["dns_aniworld"]["message"] = "Resolved successfully"
+        logger.debug("DNS health check passed for aniworld.to")
+    except socket.gaierror as e:
+        checks["dns_aniworld"]["status"] = "warning"
+        checks["dns_aniworld"]["message"] = f"DNS resolution failed: {e}"
+        logger.warning("DNS health check failed for aniworld.to: %s", e)
+    except Exception as e:
+        checks["dns_aniworld"]["status"] = "warning"
+        checks["dns_aniworld"]["message"] = f"Unexpected error: {e}"
+        logger.warning("Unexpected DNS error for aniworld.to: %s", e)
+    
+    # Check DNS resolution for api.themoviedb.org
+    try:
+        socket.gethostbyname("api.themoviedb.org")
+        checks["dns_tmdb"]["status"] = "ok"
+        checks["dns_tmdb"]["message"] = "Resolved successfully"
+        logger.debug("DNS health check passed for api.themoviedb.org")
+    except socket.gaierror as e:
+        checks["dns_tmdb"]["status"] = "warning"
+        checks["dns_tmdb"]["message"] = f"DNS resolution failed: {e}"
+        logger.warning("DNS health check failed for api.themoviedb.org: %s", e)
+    except Exception as e:
+        checks["dns_tmdb"]["status"] = "warning"
+        checks["dns_tmdb"]["message"] = f"Unexpected error: {e}"
+        logger.warning("Unexpected DNS error for api.themoviedb.org: %s", e)
+    
+    # Check anime_directory configuration and writability
+    from src.config.settings import settings
+    anime_dir = settings.anime_directory
+    
+    if not anime_dir:
+        checks["anime_directory"]["status"] = "error"
+        checks["anime_directory"]["message"] = "anime_directory not configured"
+        checks["anime_directory"]["path"] = None
+        logger.error("anime_directory health check failed: not configured")
+    else:
+        import os
+        checks["anime_directory"]["path"] = anime_dir
+        
+        if not os.path.isdir(anime_dir):
+            checks["anime_directory"]["status"] = "error"
+            checks["anime_directory"]["message"] = f"Directory does not exist: {anime_dir}"
+            logger.error("anime_directory health check failed: %s does not exist", anime_dir)
+        elif not os.access(anime_dir, os.W_OK):
+            checks["anime_directory"]["status"] = "error"
+            checks["anime_directory"]["message"] = f"Directory not writable: {anime_dir}"
+            logger.error("anime_directory health check failed: %s not writable", anime_dir)
+        else:
+            checks["anime_directory"]["status"] = "ok"
+            checks["anime_directory"]["message"] = f"Directory exists and is writable: {anime_dir}"
+            logger.debug("anime_directory health check passed: %s", anime_dir)
+    
+    return checks
 
 
 @asynccontextmanager
@@ -113,6 +214,7 @@ async def lifespan(_application: FastAPI):
     """
     # Setup logging first with INFO level
     logger = setup_logging(log_level="INFO")
+    logger.info("Starting FastAPI application v%s", APP_VERSION)
     
     # Track successful initialization steps
     initialized = {
@@ -241,7 +343,6 @@ async def lifespan(_application: FastAPI):
         from src.server.services.initialization_service import (
             perform_initial_setup,
             perform_media_scan_if_needed,
-            perform_nfo_repair_scan,
             perform_nfo_scan_if_needed,
         )
         
@@ -297,30 +398,29 @@ async def lifespan(_application: FastAPI):
                 except Exception as e:
                     logger.warning("Failed to start background loader service: %s", e)
 
-                # Initialize and start scheduler service
-                try:
-                    from src.server.services.scheduler_service import (
-                        get_scheduler_service,
-                    )
-                    scheduler_service = get_scheduler_service()
-                    await scheduler_service.start()
-                    initialized['scheduler'] = True
-                    logger.info("Scheduler service started")
-                except Exception as e:
-                    logger.warning("Failed to start scheduler service: %s", e)
-                    # Continue - scheduler is optional
-
                 # Run media scan only on first run
                 await perform_media_scan_if_needed(background_loader)
-
-                # Scan every series NFO on startup and repair any that are
-                # missing required tags by queuing them for background reload
-                await perform_nfo_repair_scan(background_loader)
             else:
                 logger.info(
                     "Download service initialization skipped - "
                     "anime directory not configured"
                 )
+
+            # Initialize and start scheduler service (independent of anime_directory)
+            # The scheduler loads its own config from config.json and the
+            # anime_directory may be configured there even if the env var is empty.
+            try:
+                logger.info("Initializing scheduler service...")
+                from src.server.services.scheduler.scheduler_service import (
+                    get_scheduler_service,
+                )
+                scheduler_service = get_scheduler_service()
+                logger.info("Scheduler service instance obtained, starting...")
+                await scheduler_service.start()
+                initialized['scheduler'] = True
+                logger.info("Scheduler service started successfully")
+            except Exception as e:
+                logger.warning("Failed to start scheduler service: %s", e)
         except (OSError, RuntimeError, ValueError) as e:
             logger.warning("Failed to initialize services: %s", e)
             # Continue startup - services can be initialized later
@@ -333,6 +433,27 @@ async def lifespan(_application: FastAPI):
         logger.info(
             "API documentation available at http://127.0.0.1:8000/api/docs"
         )
+
+        # Check for ffmpeg availability and warn if missing
+        try:
+            import shutil as _shutil
+            if _shutil.which("ffmpeg") is None:
+                logger.warning(
+                    "ffmpeg not found in PATH. HLS streams may fail to download. "
+                    "Install ffmpeg to enable HLS support."
+                )
+            else:
+                logger.debug("ffmpeg found at: %s", _shutil.which("ffmpeg"))
+        except Exception as _exc:
+            logger.warning("Could not check for ffmpeg: %s", _exc)
+
+        # Run startup health checks and store results for /health endpoint
+        try:
+            startup_checks = await _run_startup_health_checks(logger)
+            app.state.startup_checks = startup_checks
+        except Exception as _exc:
+            logger.warning("Could not run startup health checks: %s", _exc)
+            app.state.startup_checks = {}
     except Exception as e:
         logger.error("Error during startup: %s", e, exc_info=True)
         startup_error = e
@@ -377,7 +498,9 @@ async def lifespan(_application: FastAPI):
     # 1. Stop scheduler service (only if initialized)
     if initialized['scheduler']:
         try:
-            from src.server.services.scheduler_service import get_scheduler_service
+            from src.server.services.scheduler.scheduler_service import (
+                get_scheduler_service,
+            )
             scheduler_service = get_scheduler_service()
             logger.info("Stopping scheduler service...")
             await asyncio.wait_for(
@@ -422,8 +545,8 @@ async def lifespan(_application: FastAPI):
     
     # 4. Shutdown download service and persist active downloads
     try:
-        from src.server.services.download_service import (  # noqa: E501
-            _download_service_instance,
+        from src.server.services.download_service import (
+            _download_service_instance,  # noqa: E501
         )
         if _download_service_instance is not None:
             logger.info("Stopping download service...")
@@ -480,11 +603,13 @@ async def lifespan(_application: FastAPI):
         raise startup_error
 
 
+from src.server.utils.version import APP_VERSION
+
 # Initialize FastAPI app with lifespan
 app = FastAPI(
     title="Aniworld Download Manager",
     description="Modern web interface for Aniworld anime download management",
-    version="1.0.0",
+    version=APP_VERSION,
     docs_url="/api/docs",
     redoc_url="/api/redoc",
     lifespan=lifespan

src/server/middleware/error_handler.py

@@ -74,7 +74,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle authentication errors (401)."""
         logger.warning(
-            f"Authentication error: {exc.message}",
+            "Authentication error: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -94,7 +95,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle authorization errors (403)."""
         logger.warning(
-            f"Authorization error: {exc.message}",
+            "Authorization error: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -114,7 +116,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle validation errors (422)."""
         logger.info(
-            f"Validation error: {exc.message}",
+            "Validation error: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -134,7 +137,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle bad request errors (400)."""
         logger.info(
-            f"Bad request error: {exc.message}",
+            "Bad request error: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -154,7 +158,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle not found errors (404)."""
         logger.info(
-            f"Not found error: {exc.message}",
+            "Not found error: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -174,7 +179,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle conflict errors (409)."""
         logger.info(
-            f"Conflict error: {exc.message}",
+            "Conflict error: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -194,7 +200,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle rate limit errors (429)."""
         logger.warning(
-            f"Rate limit exceeded: {exc.message}",
+            "Rate limit exceeded: %s",
+            exc.message,
             extra={"details": exc.details, "path": str(request.url.path)},
         )
         return JSONResponse(
@@ -214,7 +221,8 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle generic API exceptions."""
         logger.error(
-            f"API error: {exc.message}",
+            "API error: %s",
+            exc.message,
             extra={
                 "error_code": exc.error_code,
                 "details": exc.details,
@@ -238,12 +246,13 @@ def register_exception_handlers(app: FastAPI) -> None:
     ) -> JSONResponse:
         """Handle unexpected exceptions."""
         logger.exception(
-            f"Unexpected error: {str(exc)}",
+            "Unexpected error: %s",
+            str(exc),
             extra={"path": str(request.url.path)},
         )
 
         # Log full traceback for debugging
-        logger.debug(f"Traceback: {traceback.format_exc()}")
+        logger.debug("Traceback: %s", traceback.format_exc())
 
         # Return generic error response for security
         return JSONResponse(

src/server/middleware/security.py

@@ -315,11 +315,11 @@ class RequestSanitizationMiddleware(BaseHTTPMiddleware):
             None if malicious content detected, sanitized value otherwise
         """
         if self.check_sql_injection and self._check_sql_injection(value):
-            logger.warning(f"Potential SQL injection detected: {value[:100]}")
+            logger.warning("Potential SQL injection detected: %s", value[:100])
             return None
 
         if self.check_xss and self._check_xss(value):
-            logger.warning(f"Potential XSS detected: {value[:100]}")
+            logger.warning("Potential XSS detected: %s", value[:100])
             return None
 
         return value
@@ -341,7 +341,7 @@ class RequestSanitizationMiddleware(BaseHTTPMiddleware):
             content_type
             and not any(ct in content_type for ct in self.allowed_content_types)
         ):
-            logger.warning(f"Unsupported content type: {content_type}")
+            logger.warning("Unsupported content type: %s", content_type)
             return JSONResponse(
                 status_code=415,
                 content={"detail": "Unsupported Media Type"},
@@ -350,7 +350,7 @@ class RequestSanitizationMiddleware(BaseHTTPMiddleware):
         # Check request size
         content_length = request.headers.get("content-length")
         if content_length and int(content_length) > self.max_request_size:
-            logger.warning(f"Request too large: {content_length} bytes")
+            logger.warning("Request too large: %s bytes", content_length)
             return JSONResponse(
                 status_code=413,
                 content={"detail": "Request Entity Too Large"},
@@ -361,7 +361,7 @@ class RequestSanitizationMiddleware(BaseHTTPMiddleware):
             if isinstance(value, str):
                 sanitized = self._sanitize_value(value)
                 if sanitized is None:
-                    logger.warning(f"Malicious query parameter detected: {key}")
+                    logger.warning("Malicious query parameter detected: %s", key)
                     return JSONResponse(
                         status_code=400,
                         content={"detail": "Malicious request detected"},
@@ -372,7 +372,7 @@ class RequestSanitizationMiddleware(BaseHTTPMiddleware):
             if isinstance(value, str):
                 sanitized = self._sanitize_value(value)
                 if sanitized is None:
-                    logger.warning(f"Malicious path parameter detected: {key}")
+                    logger.warning("Malicious path parameter detected: %s", key)
                     return JSONResponse(
                         status_code=400,
                         content={"detail": "Malicious request detected"},

src/server/models/anime.py

@@ -83,6 +83,30 @@ class AnimeSeriesResponse(BaseModel):
         return v
 
 
+class AnimeMetadataUpdate(BaseModel):
+    """Request model for updating anime metadata (key, tmdb_id, tvdb_id)."""
+
+    key: Optional[str] = Field(None, description="New series key (URL-safe, lowercase)")
+    tmdb_id: Optional[int] = Field(None, ge=1, description="TMDB ID (positive integer)")
+    tvdb_id: Optional[int] = Field(None, ge=1, description="TVDB ID (positive integer)")
+
+    @field_validator('key', mode='before')
+    @classmethod
+    def validate_key_format(cls, v: Optional[str]) -> Optional[str]:
+        """Validate key is URL-safe lowercase with hyphens only."""
+        if v is None:
+            return v
+        v = v.strip().lower()
+        if not v:
+            raise ValueError("Key cannot be empty")
+        if not KEY_PATTERN.match(v):
+            raise ValueError(
+                "Key must contain only lowercase letters, numbers, and hyphens. "
+                "Cannot start or end with a hyphen."
+            )
+        return v
+
+
 class SearchRequest(BaseModel):
     """Request payload for searching series."""
 

src/server/models/auth.py

@@ -73,6 +73,9 @@ class SetupRequest(BaseModel):
     scheduler_auto_download_after_rescan: Optional[bool] = Field(
         default=False, description="Auto-download missing episodes after rescan"
     )
+    scheduler_folder_scan_enabled: Optional[bool] = Field(
+        default=False, description="Run folder maintenance during scheduled run"
+    )
     
     # Logging configuration
     logging_level: Optional[str] = Field(

src/server/models/config.py

@@ -39,6 +39,23 @@ class SchedulerConfig(BaseModel):
         description="Automatically queue and start downloads for all missing "
                     "episodes after a scheduled rescan completes.",
     )
+    folder_scan_enabled: bool = Field(
+        default=False,
+        description="Run folder maintenance (NFO repair, folder renaming, "
+                    "poster checks) during the scheduled run.",
+    )
+    # Legacy alias fields — read via Pydantic alias
+    auto_download: Optional[bool] = Field(default=None, alias="auto_download")
+    folder_scan: Optional[bool] = Field(default=None, alias="folder_scan")
+
+    def __init__(self, **data):
+        super().__init__(**data)
+        # Map legacy keys to primary fields only when primary key absent from data.
+        # "key in data" checks for explicit presence (even False/None), not just truthiness.
+        if self.auto_download is not None and "auto_download_after_rescan" not in data:
+            object.__setattr__(self, "auto_download_after_rescan", self.auto_download)
+        if self.folder_scan is not None and "folder_scan_enabled" not in data:
+            object.__setattr__(self, "folder_scan_enabled", self.folder_scan)
 
     @field_validator("schedule_time")
     @classmethod
@@ -64,6 +81,22 @@ class SchedulerConfig(BaseModel):
             )
         return v
 
+    def model_dump(self, **kwargs) -> Dict[str, object]:
+        """Serialize, excluding legacy alias fields when they are None.
+
+        The alias fields (auto_download, folder_scan) must not be written to
+        config.json as null entries, otherwise a roundtrip load sees the key
+        present (哪怕 value is None) and skips the alias-to-primary mapping.
+        """
+        data = super().model_dump(**kwargs)
+        # Drop None alias fields so they don't pollute config.json.
+        # They are still settable via the constructor for backward compatibility.
+        if data.get("auto_download") is None:
+            data.pop("auto_download", None)
+        if data.get("folder_scan") is None:
+            data.pop("folder_scan", None)
+        return data
+
 
 class BackupConfig(BaseModel):
     """Configuration for automatic backups of application data."""
@@ -166,6 +199,12 @@ class AppConfig(BaseModel):
     logging: LoggingConfig = Field(default_factory=LoggingConfig)
     backup: BackupConfig = Field(default_factory=BackupConfig)
     nfo: NFOConfig = Field(default_factory=NFOConfig)
+    scan_key_overrides: Dict[str, str] = Field(
+        default_factory=dict,
+        description="Map of folder names to provider keys for scan overrides. "
+                    "Used when auto-generated keys from folder names are incorrect. "
+                    "Format: {\"Folder Name\": \"actual-provider-key\"}"
+    )
     other: Dict[str, object] = Field(
         default_factory=dict, description="Arbitrary other settings"
     )
@@ -204,6 +243,7 @@ class ConfigUpdate(BaseModel):
     logging: Optional[LoggingConfig] = None
     backup: Optional[BackupConfig] = None
     nfo: Optional[NFOConfig] = None
+    scan_key_overrides: Optional[Dict[str, str]] = None
     other: Optional[Dict[str, object]] = None
 
     def apply_to(self, current: AppConfig) -> AppConfig:
@@ -220,6 +260,8 @@ class ConfigUpdate(BaseModel):
             data["backup"] = self.backup.model_dump()
         if self.nfo is not None:
             data["nfo"] = self.nfo.model_dump()
+        if self.scan_key_overrides is not None:
+            data["scan_key_overrides"] = self.scan_key_overrides
         if self.other is not None:
             merged = dict(current.other or {})
             merged.update(self.other)

src/server/models/download.py

@@ -22,6 +22,7 @@ class DownloadStatus(str, Enum):
     COMPLETED = "completed"
     FAILED = "failed"
     CANCELLED = "cancelled"
+    PERMANENTLY_FAILED = "permanently_failed"
 
 
 class DownloadPriority(str, Enum):

src/server/models/nfo.py

@@ -355,3 +355,29 @@ class NFOMissingResponse(BaseModel):
         ...,
         description="List of series missing NFO"
     )
+
+
+class NfoDiagnosticsResponse(BaseModel):
+    """Response for NFO diagnostics showing missing required tags."""
+
+    has_nfo: bool = Field(..., description="Whether tvshow.nfo exists")
+    nfo_path: Optional[str] = Field(None, description="Path to NFO file if exists")
+    missing_tags: List[str] = Field(
+        default_factory=list,
+        description="List of missing required tag names"
+    )
+    required_tags: List[str] = Field(
+        default_factory=list,
+        description="All required tag names for reference"
+    )
+
+
+class NfoRepairResponse(BaseModel):
+    """Response after NFO repair attempt."""
+
+    success: bool = Field(..., description="Whether repair succeeded")
+    message: str = Field(..., description="Human-readable result message")
+    repaired_tags: List[str] = Field(
+        default_factory=list,
+        description="Tags that were missing before repair"
+    )

src/server/services/anime_service.py

@@ -498,13 +498,19 @@ class AnimeService:
                 logger.info("No series found in SeriesApp")
                 return []
             
-            # Build NFO metadata map and filter data from database
-            nfo_map = {}
-            series_with_no_episodes = set()
+            # Build NFO metadata map, episode dict, and filter data from database.
+            # Using DB as authoritative source for episodeDict ensures that
+            # episodes marked is_downloaded=True are never shown as missing,
+            # even if the in-memory state is stale.
+            nfo_map: dict = {}
+            db_episode_dict_map: dict[str, dict[int, list[int]]] = {}
+            series_with_no_episodes: set = set()
             
             async with get_db_session() as db:
-                # Get all series NFO metadata using service layer
-                db_series_list = await AnimeSeriesService.get_all(db)
+                # Single query: load all series with their episodes eagerly
+                db_series_list = await AnimeSeriesService.get_all(
+                    db, with_episodes=True
+                )
                 
                 for db_series in db_series_list:
                     nfo_created = (
@@ -522,21 +528,38 @@ class AnimeService:
                         "tmdb_id": db_series.tmdb_id,
                         "tvdb_id": db_series.tvdb_id,
                         "series_id": db_series.id,
+                        "loading_status": db_series.loading_status,
+                        "loading_error": db_series.loading_error,
                     }
+                    
+                    # Build episodeDict from DB, skipping is_downloaded=True
+                    # episodes so they are never shown as missing in the UI.
+                    ep_dict: dict[int, list[int]] = {}
+                    if db_series.episodes:
+                        for ep in db_series.episodes:
+                            if ep.is_downloaded:
+                                continue
+                            if ep.season not in ep_dict:
+                                ep_dict[ep.season] = []
+                            ep_dict[ep.season].append(ep.episode_number)
+                        for s in ep_dict:
+                            ep_dict[s].sort()
+                    db_episode_dict_map[db_series.folder] = ep_dict
                 
-                # If filter is "no_episodes", get series with no
-                # downloaded episodes
-                if filter_type == "no_episodes":
-                    # Use service method to get series with
-                    # undownloaded episodes
-                    series_no_downloads = (
-                        await AnimeSeriesService
-                        .get_series_with_no_episodes(db)
+                # If filter is "missing_episodes", get series with any missing episodes
+                if filter_type == "missing_episodes":
+                    series_missing = (
+                        await AnimeSeriesService.get_series_with_missing_episodes(db)
                     )
-                    series_with_no_episodes = {
-                        s.folder for s in series_no_downloads
-                    }
-            
+                    series_with_missing_episodes = {s.folder for s in series_missing}
+
+                # If filter is "no_episodes", get series with no downloaded episodes
+                if filter_type == "no_episodes":
+                    series_no_downloads = (
+                        await AnimeSeriesService.get_series_with_no_episodes(db)
+                    )
+                    series_with_no_episodes = {s.folder for s in series_no_downloads}
+
             # Build result list with enriched metadata
             result_list = []
             for serie in series:
@@ -544,9 +567,17 @@ class AnimeService:
                 name = getattr(serie, "name", "")
                 site = getattr(serie, "site", "")
                 folder = getattr(serie, "folder", "")
-                episode_dict = getattr(serie, "episodeDict", {}) or {}
-                
+                # Use DB-backed episodeDict (is_downloaded=True already filtered out)
+                # with in-memory episodeDict as fallback if the series isn't in DB yet.
+                episode_dict = db_episode_dict_map.get(
+                    folder,
+                    getattr(serie, "episodeDict", {}) or {}
+                )
+
                 # Apply filter if specified
+                if filter_type == "missing_episodes":
+                    if folder not in series_with_missing_episodes:
+                        continue
                 if filter_type == "no_episodes":
                     if folder not in series_with_no_episodes:
                         continue
@@ -567,6 +598,8 @@ class AnimeService:
                     "tmdb_id": nfo_data.get("tmdb_id"),
                     "tvdb_id": nfo_data.get("tvdb_id"),
                     "series_id": nfo_data.get("series_id"),
+                    "loading_status": nfo_data.get("loading_status"),
+                    "loading_error": nfo_data.get("loading_error"),
                 }
                 result_list.append(series_dict)
             
@@ -811,18 +844,24 @@ class AnimeService:
         - Adds new missing episodes that are not in the database
         - Removes episodes from database that are no longer missing
           (i.e., the file has been added to the filesystem)
+        - Preserves episodes marked as downloaded (is_downloaded=True)
+          so download history is not lost
         """
         from src.server.database.service import AnimeSeriesService, EpisodeService
 
-        # Get existing episodes from database
+        # Get existing episodes from database (all episodes, including downloaded)
         existing_episodes = await EpisodeService.get_by_series(db, existing.id)
         
         # Build dict of existing episodes: {season: {ep_num: episode_id}}
+        # and track which ones are already downloaded
         existing_dict: dict[int, dict[int, int]] = {}
+        downloaded_set: set[tuple[int, int]] = set()
         for ep in existing_episodes:
             if ep.season not in existing_dict:
                 existing_dict[ep.season] = {}
             existing_dict[ep.season][ep.episode_number] = ep.id
+            if ep.is_downloaded:
+                downloaded_set.add((ep.season, ep.episode_number))
         
         # Get new missing episodes from scan
         new_dict = serie.episodeDict or {}
@@ -853,9 +892,22 @@ class AnimeService:
         
         # Remove episodes from database that are no longer missing
         # (i.e., the episode file now exists on the filesystem)
+        # BUT: preserve episodes that are already downloaded (is_downloaded=True)
+        # so we don't lose download history
         for season, eps_dict in existing_dict.items():
             for ep_num, episode_id in eps_dict.items():
                 if (season, ep_num) not in new_missing_set:
+                    # Skip already-downloaded episodes — they should stay in DB
+                    # with is_downloaded=True to preserve download history
+                    if (season, ep_num) in downloaded_set:
+                        logger.debug(
+                            "Preserving downloaded episode in database: "
+                            "%s S%02dE%02d",
+                            serie.key,
+                            season,
+                            ep_num
+                        )
+                        continue
                     await EpisodeService.delete(db, episode_id)
                     logger.info(
                         "Removed episode from database (no longer missing): "
@@ -885,6 +937,10 @@ class AnimeService:
         
         This method is called during initialization and after rescans
         to ensure the in-memory series list is in sync with the database.
+        
+        Only episodes where is_downloaded=False are loaded into the
+        in-memory episodeDict, so downloaded episodes are not shown
+        as missing.
         """
         from src.core.entities.series import Serie
         from src.server.database.connection import get_db_session
@@ -899,9 +955,14 @@ class AnimeService:
             series_list = []
             for anime_series in anime_series_list:
                 # Build episode_dict from episodes relationship
+                # Only include episodes that are NOT downloaded (is_downloaded=False)
+                # so the missing-episode list stays accurate
                 episode_dict: dict[int, list[int]] = {}
                 if anime_series.episodes:
                     for episode in anime_series.episodes:
+                        # Skip downloaded episodes — they are not missing
+                        if episode.is_downloaded:
+                            continue
                         season = episode.season
                         if season not in episode_dict:
                             episode_dict[season] = []
@@ -915,7 +976,8 @@ class AnimeService:
                     name=anime_series.name,
                     site=anime_series.site,
                     folder=anime_series.folder,
-                    episodeDict=episode_dict
+                    episodeDict=episode_dict,
+                    year=anime_series.year
                 )
                 series_list.append(serie)
             
@@ -941,12 +1003,12 @@ class AnimeService:
 
         # Get the serie from in-memory cache
         if not hasattr(self._app, 'list') or not hasattr(self._app.list, 'keyDict'):
-            logger.warning(f"Series list not available for episode sync: {series_key}")
+            logger.warning("Series list not available for episode sync: %s", series_key)
             return 0
         
         serie = self._app.list.keyDict.get(series_key)
         if not serie:
-            logger.warning(f"Series not found in memory for episode sync: {series_key}")
+            logger.warning("Series not found in memory for episode sync: %s", series_key)
             return 0
         
         episodes_added = 0
@@ -955,26 +1017,42 @@ class AnimeService:
             # Get series from database
             series_db = await AnimeSeriesService.get_by_key(db, series_key)
             if not series_db:
-                logger.warning(f"Series not found in database: {series_key}")
+                logger.warning("Series not found in database: %s", series_key)
                 return 0
             
-            # Get existing episodes from database
+            # Get existing episodes from database (all, including downloaded)
             existing_episodes = await EpisodeService.get_by_series(db, series_db.id)
             
             # Build dict of existing episodes: {season: {ep_num: episode_id}}
+            # and track which ones are already downloaded
             existing_dict: dict[int, dict[int, int]] = {}
+            downloaded_set: set[tuple[int, int]] = set()
             for ep in existing_episodes:
                 if ep.season not in existing_dict:
                     existing_dict[ep.season] = {}
                 existing_dict[ep.season][ep.episode_number] = ep.id
+                if ep.is_downloaded:
+                    downloaded_set.add((ep.season, ep.episode_number))
             
             # Get new missing episodes from in-memory serie
             new_dict = serie.episodeDict or {}
             
             # Add new missing episodes that are not in the database
+            # Skip episodes that are already downloaded (is_downloaded=True)
+            # so we don't re-add them as missing after they've been downloaded
             for season, episode_numbers in new_dict.items():
                 existing_season_eps = existing_dict.get(season, {})
                 for ep_num in episode_numbers:
+                    # Skip if already downloaded — don't re-add as missing
+                    if (season, ep_num) in downloaded_set:
+                        logger.debug(
+                            "Skipping already-downloaded episode: "
+                            "%s S%02dE%02d",
+                            series_key,
+                            season,
+                            ep_num,
+                        )
+                        continue
                     if ep_num not in existing_season_eps:
                         await EpisodeService.create(
                             db=db,
@@ -996,7 +1074,7 @@ class AnimeService:
                 try:
                     await self._broadcast_series_updated(series_key)
                 except Exception as e:
-                    logger.warning(f"Failed to broadcast series update: {e}")
+                    logger.warning("Failed to broadcast series update: %s", e)
         
         return episodes_added
     
@@ -1010,20 +1088,23 @@ class AnimeService:
         if hasattr(self._app, 'list') and hasattr(self._app.list, 'keyDict'):
             serie = self._app.list.keyDict.get(series_key)
             if serie:
-                # Convert episode dict keys to strings for JSON
-                missing_episodes = {str(k): v for k, v in (serie.episodeDict or {}).items()}
-                total_missing = sum(len(eps) for eps in missing_episodes.values())
-                
-                # Fetch NFO metadata from database
+                # Fetch NFO metadata and episodes from database.
+                # Using DB as the authoritative source for missing_episodes
+                # ensures that episodes marked is_downloaded=True are never
+                # broadcast as missing, even if in-memory state is stale.
                 has_nfo = False
                 nfo_created_at = None
                 nfo_updated_at = None
                 tmdb_id = None
                 tvdb_id = None
+                missing_episodes: dict[str, list] = {}
                 
                 try:
                     from src.server.database.connection import get_db_session
-                    from src.server.database.service import AnimeSeriesService
+                    from src.server.database.service import (
+                        AnimeSeriesService,
+                        EpisodeService,
+                    )
                     
                     async with get_db_session() as db:
                         db_series = await AnimeSeriesService.get_by_key(db, series_key)
@@ -1039,12 +1120,31 @@ class AnimeService:
                             )
                             tmdb_id = db_series.tmdb_id
                             tvdb_id = db_series.tvdb_id
+                            
+                            # Build missing_episodes from DB, skipping is_downloaded=True
+                            db_episodes = await EpisodeService.get_by_series(
+                                db, db_series.id, only_missing=True
+                            )
+                            for ep in db_episodes:
+                                key_str = str(ep.season)
+                                if key_str not in missing_episodes:
+                                    missing_episodes[key_str] = []
+                                missing_episodes[key_str].append(ep.episode_number)
+                            for s in missing_episodes:
+                                missing_episodes[s].sort()
                 except Exception as e:
                     logger.warning(
-                        "Could not fetch NFO data for %s: %s",
+                        "Could not fetch series data for %s from DB: %s",
                         series_key,
                         str(e)
                     )
+                    # Fallback to in-memory state
+                    missing_episodes = {
+                        str(k): v
+                        for k, v in (serie.episodeDict or {}).items()
+                    }
+                
+                total_missing = sum(len(eps) for eps in missing_episodes.values())
                 
                 series_data = {
                     "key": serie.key,
@@ -1458,19 +1558,17 @@ def get_anime_service(series_app: SeriesApp) -> AnimeService:
     return AnimeService(series_app)
 
 
-async def sync_series_from_data_files(
+async def sync_legacy_series_to_db(
     anime_directory: str,
     log_instance=None  # pylint: disable=unused-argument
 ) -> int:
     """
-    Sync series from data files to the database.
+    One-time legacy sync: import any series from 'data' files
+    not already in the database.
 
-    Scans the anime directory for data files and adds any new series
-    to the database. Existing series are skipped (no duplicates).
-
-    This function is typically called during application startup to ensure
-    series metadata stored in filesystem data files is available in the
-    database.
+    Deprecated: Series are now loaded directly from the database.
+    This function remains for backwards compatibility with legacy
+    file-based data during migration.
 
     Args:
         anime_directory: Path to the anime directory with data files
@@ -1482,6 +1580,11 @@ async def sync_series_from_data_files(
     """
     # Always use structlog for structured logging with keyword arguments
     log = structlog.get_logger(__name__)
+        
+    log.warning(
+        "sync_legacy_series_to_db is deprecated. "
+        "Series are now loaded directly from database."
+    )
 
     try:
         from src.server.database.connection import get_db_session
@@ -1546,6 +1649,7 @@ async def sync_series_from_data_files(
                         name=serie.name,
                         site=serie.site,
                         folder=serie.folder,
+                        year=serie.year if hasattr(serie, 'year') else None,
                     )
                     
                     # Create Episode records for each episode in episodeDict

src/server/services/background_loader_service.py

@@ -22,6 +22,7 @@ from typing import Any, Dict, List, Optional
 
 import structlog
 
+from src.core.services.nfo_factory import get_nfo_factory
 from src.server.services.websocket_service import WebSocketService
 
 logger = structlog.get_logger(__name__)
@@ -188,7 +189,7 @@ class BackgroundLoaderService:
         """
         # Check if task already exists
         if key in self.active_tasks:
-            logger.debug(f"Task for series {key} already exists, skipping")
+            logger.debug("Task for series %s already exists, skipping", key)
             return
         
         task = SeriesLoadingTask(
@@ -202,7 +203,7 @@ class BackgroundLoaderService:
         self.active_tasks[key] = task
         await self.task_queue.put(task)
         
-        logger.info(f"Added loading task for series: {key}")
+        logger.info("Added loading task for series: %s", key)
         
         # Broadcast initial status
         await self._broadcast_status(task)
@@ -277,7 +278,7 @@ class BackgroundLoaderService:
         Args:
             worker_id: Unique identifier for this worker instance
         """
-        logger.info(f"Background worker {worker_id} started processing tasks")
+        logger.info("Background worker %s started processing tasks", worker_id)
         
         while not self._shutdown:
             try:
@@ -301,14 +302,14 @@ class BackgroundLoaderService:
                 # No task available, continue loop
                 continue
             except asyncio.CancelledError:
-                logger.info(f"Worker {worker_id} task cancelled")
+                logger.info("Worker %s task cancelled", worker_id)
                 break
             except Exception as e:
-                logger.exception(f"Error in background worker {worker_id}: {e}")
+                logger.exception("Error in background worker %s: %s", worker_id, e)
                 # Continue processing other tasks
                 continue
         
-        logger.info(f"Background worker {worker_id} stopped")
+        logger.info("Background worker %s stopped", worker_id)
     
     async def _load_series_data(self, task: SeriesLoadingTask) -> None:
         """Load all missing data for a series.
@@ -362,10 +363,10 @@ class BackgroundLoaderService:
                     # Broadcast completion
                     await self._broadcast_status(task)
                     
-                    logger.info(f"Successfully loaded all data for series: {task.key}")
+                    logger.info("Successfully loaded all data for series: %s", task.key)
                     
                 except Exception as e:
-                    logger.exception(f"Error loading series data: {e}")
+                    logger.exception("Error loading series data: %s", e)
                     task.status = LoadingStatus.FAILED
                     task.error = str(e)
                     task.completed_at = datetime.now(timezone.utc)
@@ -400,14 +401,14 @@ class BackgroundLoaderService:
             
             # Check if directory exists
             if series_dir.exists() and series_dir.is_dir():
-                logger.debug(f"Found series directory: {series_dir}")
+                logger.debug("Found series directory: %s", series_dir)
                 return series_dir
             else:
-                logger.warning(f"Series directory not found: {series_dir}")
+                logger.warning("Series directory not found: %s", series_dir)
                 return None
                 
         except Exception as e:
-            logger.error(f"Error finding series directory for {task.key}: {e}")
+            logger.error("Error finding series directory for %s: %s", task.key, e)
             return None
     
     async def _scan_series_episodes(self, series_dir: Path, task: SeriesLoadingTask) -> Dict[str, List[str]]:
@@ -440,13 +441,13 @@ class BackgroundLoaderService:
                 
                 if episodes:
                     episodes_by_season[season_name] = episodes
-                    logger.debug(f"Found {len(episodes)} episodes in {season_name}")
+                    logger.debug("Found %s episodes in %s", len(episodes), season_name)
             
-            logger.info(f"Scanned {len(episodes_by_season)} seasons for {task.key}")
+            logger.info("Scanned %s seasons for %s", len(episodes_by_season), task.key)
             return episodes_by_season
             
         except Exception as e:
-            logger.error(f"Error scanning episodes for {task.key}: {e}")
+            logger.error("Error scanning episodes for %s: %s", task.key, e)
             return {}
     
     async def _load_episodes(self, task: SeriesLoadingTask, db: Any) -> None:
@@ -466,7 +467,7 @@ class BackgroundLoaderService:
             # Find series directory without full rescan
             series_dir = await self._find_series_directory(task)
             if not series_dir:
-                logger.error(f"Cannot load episodes - directory not found for {task.key}")
+                logger.error("Cannot load episodes - directory not found for %s", task.key)
                 task.progress["episodes"] = False
                 return
             
@@ -474,7 +475,7 @@ class BackgroundLoaderService:
             episodes_by_season = await self._scan_series_episodes(series_dir, task)
             
             if not episodes_by_season:
-                logger.warning(f"No episodes found for {task.key}")
+                logger.warning("No episodes found for %s", task.key)
                 task.progress["episodes"] = False
                 return
             
@@ -489,10 +490,10 @@ class BackgroundLoaderService:
                 series_db.loading_status = "loading_episodes"
                 await db.commit()
             
-            logger.info(f"Episodes loaded for series: {task.key} ({len(episodes_by_season)} seasons)")
+            logger.info("Episodes loaded for series: %s (%s seasons)", task.key, len(episodes_by_season))
             
         except Exception as e:
-            logger.exception(f"Failed to load episodes for {task.key}: {e}")
+            logger.exception("Failed to load episodes for %s: %s", task.key, e)
             raise
     
     async def _load_nfo_and_images(self, task: SeriesLoadingTask, db: Any) -> bool:
@@ -521,7 +522,7 @@ class BackgroundLoaderService:
             
             # Check if NFO already exists
             if self.series_app.nfo_service.has_nfo(task.folder):
-                logger.info(f"NFO already exists for {task.key}, skipping creation")
+                logger.info("NFO already exists for %s, skipping creation", task.key)
                 
                 # Update task progress
                 task.progress["nfo"] = True
@@ -536,31 +537,46 @@ class BackgroundLoaderService:
                     if not series_db.has_nfo:
                         series_db.has_nfo = True
                         series_db.nfo_created_at = datetime.now(timezone.utc)
-                        logger.info(f"Updated database with existing NFO for {task.key}")
+                        logger.info("Updated database with existing NFO for %s", task.key)
                     if not series_db.logo_loaded:
                         series_db.logo_loaded = True
                     if not series_db.images_loaded:
                         series_db.images_loaded = True
                     await db.commit()
                 
-                logger.info(f"Existing NFO found and database updated for series: {task.key}")
+                logger.info("Existing NFO found and database updated for series: %s", task.key)
                 return False
             
             # NFO doesn't exist, create it
             await self._broadcast_status(task, "Generating NFO file...")
-            logger.info(f"Creating new NFO for {task.key}")
-            
-            # Use existing NFOService to create NFO with all images
-            # This reuses all existing TMDB API logic and image downloading
-            nfo_path = await self.series_app.nfo_service.create_tvshow_nfo(
-                serie_name=task.name,
-                serie_folder=task.folder,
-                year=task.year,
-                download_poster=True,
-                download_logo=True,
-                download_fanart=True
-            )
+            logger.info("Creating new NFO for %s", task.key)
             
+            # Create a fresh NFOService for this task to avoid shared TMDB session closure
+            try:
+                factory = get_nfo_factory()
+                nfo_service = factory.create()
+            except ValueError:
+                logger.warning(
+                    "NFOService unavailable for %s, skipping NFO/images",
+                    task.key
+                )
+                task.progress["nfo"] = False
+                task.progress["logo"] = False
+                task.progress["images"] = False
+                return False
+
+            try:
+                nfo_path = await nfo_service.create_tvshow_nfo(
+                    serie_name=task.name,
+                    serie_folder=task.folder,
+                    year=task.year,
+                    download_poster=True,
+                    download_logo=True,
+                    download_fanart=True
+                )
+            finally:
+                await nfo_service.close()
+
             # Update task progress
             task.progress["nfo"] = True
             task.progress["logo"] = True
@@ -577,11 +593,11 @@ class BackgroundLoaderService:
                 series_db.loading_status = "loading_nfo"
                 await db.commit()
             
-            logger.info(f"NFO and images created and loaded for series: {task.key}")
+            logger.info("NFO and images created and loaded for series: %s", task.key)
             return True
             
         except Exception as e:
-            logger.exception(f"Failed to load NFO/images for {task.key}: {e}")
+            logger.exception("Failed to load NFO/images for %s: %s", task.key, e)
             # Don't fail the entire task if NFO fails
             task.progress["nfo"] = False
             task.progress["logo"] = False
@@ -611,7 +627,7 @@ class BackgroundLoaderService:
             
             # Scan for missing episodes using the targeted scan method
             # This populates the episodeDict without triggering a full rescan
-            logger.info(f"Scanning missing episodes for {task.key}")
+            logger.info("Scanning missing episodes for %s", task.key)
             missing_episodes = self.series_app.serie_scanner.scan_single_series(
                 key=task.key,
                 folder=task.folder
@@ -628,12 +644,12 @@ class BackgroundLoaderService:
                 # Notify anime_service to sync episodes to database
                 # Use sync_single_series_after_scan which gets data from serie_scanner.keyDict
                 if self.anime_service:
-                    logger.debug(f"Calling anime_service.sync_single_series_after_scan for {task.key}")
+                    logger.debug("Calling anime_service.sync_single_series_after_scan for %s", task.key)
                     await self.anime_service.sync_single_series_after_scan(task.key)
                 else:
-                    logger.warning(f"anime_service not available, episodes will not be synced to DB for {task.key}")
+                    logger.warning("anime_service not available, episodes will not be synced to DB for %s", task.key)
             else:
-                logger.info(f"No missing episodes found for {task.key}")
+                logger.info("No missing episodes found for %s", task.key)
             
             # Update series status in database
             from src.server.database.service import AnimeSeriesService
@@ -648,7 +664,7 @@ class BackgroundLoaderService:
             task.progress["episodes"] = True
             
         except Exception as e:
-            logger.exception(f"Failed to scan missing episodes for {task.key}: {e}")
+            logger.exception("Failed to scan missing episodes for %s: %s", task.key, e)
             task.progress["episodes"] = False
     
     async def _broadcast_status(

src/server/services/cache_service.py

@@ -170,14 +170,17 @@ class InMemoryCacheBackend(CacheBackend):
         """Get value from cache."""
         async with self._lock:
             if key not in self.cache:
+                logger.debug("Cache miss for key: %s", key)
                 return None
 
             item = self.cache[key]
 
             if self._is_expired(item):
+                logger.debug("Cache expired for key: %s", key)
                 del self.cache[key]
                 return None
 
+            logger.debug("Cache hit for key: %s", key)
             return item["value"]
 
     async def set(
@@ -196,6 +199,7 @@ class InMemoryCacheBackend(CacheBackend):
                 "expiry": expiry,
                 "created": datetime.utcnow(),
             }
+            logger.debug("Cached key: %s (ttl=%s)", key, ttl)
             return True
 
     async def delete(self, key: str) -> bool:
@@ -203,7 +207,9 @@ class InMemoryCacheBackend(CacheBackend):
         async with self._lock:
             if key in self.cache:
                 del self.cache[key]
+                logger.debug("Deleted cache key: %s", key)
                 return True
+            logger.debug("Cache delete skipped; key not found: %s", key)
             return False
 
     async def exists(self, key: str) -> bool:
@@ -223,6 +229,7 @@ class InMemoryCacheBackend(CacheBackend):
         """Clear all cached values."""
         async with self._lock:
             self.cache.clear()
+            logger.debug("Cleared in-memory cache")
             return True
 
     async def get_many(self, keys: List[str]) -> Dict[str, Any]:
@@ -281,13 +288,14 @@ class RedisCacheBackend(CacheBackend):
                 import aioredis
 
                 self._redis = await aioredis.create_redis_pool(self.redis_url)
+                logger.debug("Connected to Redis at %s", self.redis_url)
             except ImportError:
                 logger.error(
                     "aioredis not installed. Install with: pip install aioredis"
                 )
                 raise
             except Exception as e:
-                logger.error(f"Failed to connect to Redis: {e}")
+                logger.error("Failed to connect to Redis: %s", e)
                 raise
 
         return self._redis
@@ -308,7 +316,7 @@ class RedisCacheBackend(CacheBackend):
             return pickle.loads(data)
 
         except Exception as e:
-            logger.error(f"Redis get error: {e}")
+            logger.error("Redis get error: %s", e)
             return None
 
     async def set(
@@ -327,7 +335,7 @@ class RedisCacheBackend(CacheBackend):
             return True
 
         except Exception as e:
-            logger.error(f"Redis set error: {e}")
+            logger.error("Redis set error: %s", e)
             return False
 
     async def delete(self, key: str) -> bool:
@@ -338,7 +346,7 @@ class RedisCacheBackend(CacheBackend):
             return result > 0
 
         except Exception as e:
-            logger.error(f"Redis delete error: {e}")
+            logger.error("Redis delete error: %s", e)
             return False
 
     async def exists(self, key: str) -> bool:
@@ -348,7 +356,7 @@ class RedisCacheBackend(CacheBackend):
             return await redis.exists(self._make_key(key))
 
         except Exception as e:
-            logger.error(f"Redis exists error: {e}")
+            logger.error("Redis exists error: %s", e)
             return False
 
     async def clear(self) -> bool:
@@ -361,7 +369,7 @@ class RedisCacheBackend(CacheBackend):
             return True
 
         except Exception as e:
-            logger.error(f"Redis clear error: {e}")
+            logger.error("Redis clear error: %s", e)
             return False
 
     async def get_many(self, keys: List[str]) -> Dict[str, Any]:
@@ -379,7 +387,7 @@ class RedisCacheBackend(CacheBackend):
             return result
 
         except Exception as e:
-            logger.error(f"Redis get_many error: {e}")
+            logger.error("Redis get_many error: %s", e)
             return {}
 
     async def set_many(
@@ -392,7 +400,7 @@ class RedisCacheBackend(CacheBackend):
             return True
 
         except Exception as e:
-            logger.error(f"Redis set_many error: {e}")
+            logger.error("Redis set_many error: %s", e)
             return False
 
     async def delete_pattern(self, pattern: str) -> int:
@@ -409,7 +417,7 @@ class RedisCacheBackend(CacheBackend):
             return 0
 
         except Exception as e:
-            logger.error(f"Redis delete_pattern error: {e}")
+            logger.error("Redis delete_pattern error: %s", e)
             return 0
 
     async def close(self) -> None:

src/server/services/config_service.py

@@ -8,6 +8,7 @@ This service handles:
 """
 
 import json
+import logging
 import shutil
 from datetime import datetime
 from pathlib import Path
@@ -15,6 +16,8 @@ from typing import Dict, List, Optional
 
 from src.server.models.config import AppConfig, ConfigUpdate, ValidationResult
 
+logger = logging.getLogger(__name__)
+
 
 class ConfigServiceError(Exception):
     """Base exception for configuration service errors."""
@@ -41,7 +44,7 @@ class ConfigService:
     """
     
     # Current configuration schema version
-    CONFIG_VERSION = "1.0.0"
+    CONFIG_VERSION = "1.0.1"
     
     def __init__(
         self,
@@ -136,12 +139,18 @@ class ConfigService:
                 self.create_backup()
             except ConfigBackupError as e:
                 # Log but don't fail save operation
-                print(f"Warning: Failed to create backup: {e}")
+                logger.warning("Failed to create backup: %s", e)
         
         # Save configuration with version
         data = config.model_dump()
         data["version"] = self.CONFIG_VERSION
-        
+
+        # Re-serialize SchedulerConfig through its overridden model_dump so
+        # that None legacy alias fields are stripped before writing to disk.
+        # Pydantic converts nested models to plain dicts in model_dump() output,
+        # so we call the override explicitly on the scheduler field.
+        data["scheduler"] = config.scheduler.model_dump()
+
         # Write to temporary file first for atomic operation
         temp_path = self.config_path.with_suffix(".tmp")
         try:

src/server/services/download_service.py

@@ -14,6 +14,7 @@ import uuid
 from collections import deque
 from concurrent.futures import ThreadPoolExecutor
 from datetime import datetime, timezone
+from pathlib import Path
 from typing import TYPE_CHECKING, Dict, List, Optional
 
 import structlog
@@ -68,6 +69,7 @@ class DownloadService:
             progress_service: Optional progress service for tracking
         """
         self._anime_service = anime_service
+        self._directory = anime_service._directory
         self._max_retries = max_retries
         self._progress_service = progress_service or get_progress_service()
         
@@ -79,6 +81,9 @@ class DownloadService:
         self._pending_queue: deque[DownloadItem] = deque()
         # Helper dict for O(1) lookup of pending items by ID
         self._pending_items_by_id: Dict[str, DownloadItem] = {}
+        # Helper dict for O(1) lookup of pending items by episode identity
+        # Key: (serie_id, season, episode), Value: item ID
+        self._pending_by_episode: Dict[tuple, str] = {}
         self._active_download: Optional[DownloadItem] = None
         self._completed_items: deque[DownloadItem] = deque(maxlen=100)
         self._failed_items: deque[DownloadItem] = deque(maxlen=50)
@@ -165,6 +170,27 @@ class DownloadService:
             logger.error("Failed to save item to database: %s", e)
             return item
     
+    async def _set_status_in_database(
+        self,
+        item_id: str,
+        status: str,
+    ) -> bool:
+        """Set status on an item in the database.
+        
+        Args:
+            item_id: Download item ID
+            status: New status value
+            
+        Returns:
+            True if update succeeded
+        """
+        try:
+            repository = self._get_repository()
+            return await repository.set_status(item_id, status)
+        except Exception as e:
+            logger.error("Failed to set status in database: %s", e)
+            return False
+    
     async def _set_error_in_database(
         self,
         item_id: str,
@@ -186,6 +212,25 @@ class DownloadService:
             logger.error("Failed to set error in database: %s", e)
             return False
     
+    async def _increment_retry_in_database(
+        self,
+        item_id: str,
+    ) -> bool:
+        """Increment retry count on an item in the database.
+        
+        Args:
+            item_id: Download item ID
+            
+        Returns:
+            True if update succeeded
+        """
+        try:
+            repository = self._get_repository()
+            return await repository.increment_retry(item_id)
+        except Exception as e:
+            logger.error("Failed to increment retry in database: %s", e)
+            return False
+    
     async def _delete_from_database(self, item_id: str) -> bool:
         """Delete an item from the database.
         
@@ -207,52 +252,259 @@ class DownloadService:
         series_key: str,
         season: int,
         episode: int,
+        serie_folder: Optional[str] = None,
     ) -> bool:
-        """Remove a downloaded episode from the missing episodes list.
+        """Mark a downloaded episode as downloaded instead of deleting it.
         
-        Called when a download completes successfully to update the
-        database so the episode no longer appears as missing.
+        Called when a download completes successfully to update both:
+        1. The database (Episode record marked is_downloaded=True)
+        2. The in-memory Serie.episodeDict and series_list cache
+        
+        This ensures the episode no longer appears as missing in both
+        the API responses and the UI immediately after download,
+        while preserving the download history.
         
         Args:
             series_key: Unique provider key for the series
             season: Season number
             episode: Episode number within season
+            serie_folder: Series folder name (required for file_path)
             
         Returns:
-            True if episode was removed, False otherwise
+            True if episode was updated, False otherwise
         """
         try:
             from src.server.database.connection import get_db_session
-            from src.server.database.service import EpisodeService
+            from src.server.database.service import AnimeSeriesService, EpisodeService
+            
+            logger.info(
+                "Attempting to mark episode as downloaded in DB: "
+                "%s S%02dE%02d",
+                series_key,
+                season,
+                episode,
+            )
             
             async with get_db_session() as db:
-                deleted = await EpisodeService.delete_by_series_and_episode(
+                # Get series by key to find series_id
+                series = await AnimeSeriesService.get_by_key(db, series_key)
+                if not series:
+                    logger.warning(
+                        "Series not found for key: %s", series_key
+                    )
+                    return False
+                
+                # Get episode by series_id, season, episode_number
+                ep = await EpisodeService.get_by_episode(
                     db=db,
-                    series_key=series_key,
+                    series_id=series.id,
                     season=season,
                     episode_number=episode,
                 )
-                if deleted:
+                if not ep:
+                    logger.warning(
+                        "Episode not found in DB: %s S%02dE%02d",
+                        series_key,
+                        season,
+                        episode,
+                    )
+                    return False
+                
+                # Construct file_path if serie_folder provided
+                file_path = None
+                if serie_folder:
+                    season_folder = f"Season {season}"
+                    file_path = str(
+                        Path(self._directory) / serie_folder / season_folder
+                    )
+                
+                # Mark episode as downloaded instead of deleting
+                updated = await EpisodeService.mark_downloaded(
+                    db=db,
+                    episode_id=ep.id,
+                    file_path=file_path or "",
+                )
+                
+                if updated:
                     logger.info(
-                        "Removed episode from missing list: "
+                        "Marked episode as downloaded in DB: "
+                        "%s S%02dE%02d, file_path=%s",
+                        series_key,
+                        season,
+                        episode,
+                        file_path,
+                    )
+                else:
+                    logger.warning(
+                        "Failed to mark episode as downloaded: "
                         "%s S%02dE%02d",
                         series_key,
                         season,
                         episode,
                     )
-                    # Clear the anime service cache so list_missing
-                    # returns updated data
-                    try:
-                        self._anime_service._cached_list_missing.cache_clear()
-                    except Exception:
-                        pass
-                return deleted
+                    return False
+            
+            # Update in-memory Serie.episodeDict so list_missing is
+            # immediately consistent without a full DB reload
+            self._remove_episode_from_memory(series_key, season, episode)
+            
+            # Clear the anime service cache so list_missing
+            # re-reads from the (now updated) in-memory state
+            try:
+                self._anime_service._cached_list_missing.cache_clear()
+                logger.debug(
+                    "Cleared list_missing cache after marking "
+                    "%s S%02dE%02d as downloaded",
+                    series_key,
+                    season,
+                    episode,
+                )
+            except Exception:
+                pass
+            
+            # Broadcast real-time update to frontend so the series card
+            # immediately reflects the new downloaded state (no longer
+            # shows the episode as missing) without waiting for a full
+            # reload on DOWNLOAD_COMPLETED.
+            try:
+                await self._anime_service._broadcast_series_updated(
+                    series_key
+                )
+                logger.debug(
+                    "Broadcast series_updated after marking "
+                    "%s S%02dE%02d as downloaded",
+                    series_key,
+                    season,
+                    episode,
+                )
+            except Exception as broadcast_exc:
+                logger.warning(
+                    "Failed to broadcast series update after marking "
+                    "%s S%02dE%02d as downloaded: %s",
+                    series_key,
+                    season,
+                    episode,
+                    broadcast_exc,
+                )
+            
+            return True
         except Exception as e:
             logger.error(
-                "Failed to remove episode from missing list: %s", e
+                "Failed to mark episode as downloaded: "
+                "%s S%02dE%02d - %s",
+                series_key,
+                season,
+                episode,
+                e,
             )
             return False
 
+    def _remove_episode_from_memory(
+        self,
+        series_key: str,
+        season: int,
+        episode: int,
+    ) -> None:
+        """Remove an episode from the in-memory Serie.episodeDict.
+        
+        Updates the SeriesApp's keyDict so that list_missing and
+        series_list reflect the removal immediately without needing
+        a full database reload.
+        
+        Args:
+            series_key: Unique provider key for the series
+            season: Season number
+            episode: Episode number within season
+        """
+        try:
+            app = self._anime_service._app
+            serie = app.list.keyDict.get(series_key)
+            if not serie:
+                logger.debug(
+                    "Series %s not found in keyDict, skipping "
+                    "in-memory removal",
+                    series_key,
+                )
+                return
+            
+            ep_dict = serie.episodeDict
+            if season not in ep_dict:
+                logger.debug(
+                    "Season %d not in episodeDict for %s, "
+                    "skipping in-memory removal",
+                    season,
+                    series_key,
+                )
+                return
+            
+            if episode in ep_dict[season]:
+                ep_dict[season].remove(episode)
+                logger.info(
+                    "Removed episode from in-memory episodeDict: "
+                    "%s S%02dE%02d (remaining in season: %s)",
+                    series_key,
+                    season,
+                    episode,
+                    ep_dict[season],
+                )
+                
+                # Remove the season key if no episodes remain
+                if not ep_dict[season]:
+                    del ep_dict[season]
+                    logger.info(
+                        "Removed empty season %d from episodeDict "
+                        "for %s",
+                        season,
+                        series_key,
+                    )
+                
+                # Refresh series_list so GetMissingEpisode()
+                # reflects the change
+                app.series_list = app.list.GetMissingEpisode()
+                logger.info(
+                    "Refreshed series_list: %d series with "
+                    "missing episodes remaining",
+                    len(app.series_list),
+                )
+                
+                # Update deprecated data file if it exists
+                # DB is authoritative; data file is optional backup
+                serie_folder = serie.folder
+                data_path = Path(self._directory) / serie_folder / "data"
+                if data_path.exists():
+                    try:
+                        import warnings
+                        with warnings.catch_warnings():
+                            warnings.simplefilter("ignore", DeprecationWarning)
+                            serie.save_to_file(str(data_path))
+                        logger.debug(
+                            "Updated data file after download: %s",
+                            data_path,
+                        )
+                    except Exception as e:
+                        logger.warning(
+                            "Failed to update data file %s: %s",
+                            data_path,
+                            e,
+                        )
+            else:
+                logger.debug(
+                    "Episode %d not in season %d for %s, "
+                    "already removed from memory",
+                    episode,
+                    season,
+                    series_key,
+                )
+        except Exception as e:
+            logger.warning(
+                "Failed to remove episode from in-memory state: "
+                "%s S%02dE%02d - %s",
+                series_key,
+                season,
+                episode,
+                e,
+            )
+
     async def _init_queue_progress(self) -> None:
         """Initialize the download queue progress tracking.
         
@@ -272,12 +524,21 @@ class DownloadService:
             )
             self._queue_progress_initialized = True
         except Exception as e:
-            logger.error("Failed to initialize queue progress: %s", e)
+            # If the entry already exists (e.g. from a concurrent task),
+            # treat that as success — the progress is usable.
+            from src.server.services.progress_service import ProgressServiceError
+            if isinstance(e, ProgressServiceError) and "already exists" in str(e):
+                logger.debug(
+                    "Queue progress already initialized by concurrent task"
+                )
+                self._queue_progress_initialized = True
+            else:
+                logger.error("Failed to initialize queue progress: %s", e)
 
     def _add_to_pending_queue(
         self, item: DownloadItem, front: bool = False
     ) -> None:
-        """Add item to pending queue and update helper dict.
+        """Add item to pending queue and update helper dicts.
         
         Args:
             item: Download item to add
@@ -288,9 +549,12 @@ class DownloadService:
         else:
             self._pending_queue.append(item)
         self._pending_items_by_id[item.id] = item
+        # Track by episode identity for deduplication
+        ep_key = (item.serie_id, item.episode.season, item.episode.episode)
+        self._pending_by_episode[ep_key] = item.id
 
     def _remove_from_pending_queue(self, item_or_id: str) -> Optional[DownloadItem]:  # noqa: E501
-        """Remove item from pending queue and update helper dict.
+        """Remove item from pending queue and update helper dicts.
         
         Args:
             item_or_id: Item ID to remove
@@ -310,6 +574,10 @@ class DownloadService:
         try:
             self._pending_queue.remove(item)
             del self._pending_items_by_id[item_id]
+            # Clean up episode tracking
+            ep_key = (item.serie_id, item.episode.season, item.episode.episode)
+            if self._pending_by_episode.get(ep_key) == item_id:
+                del self._pending_by_episode[ep_key]
             return item
         except (ValueError, KeyError):
             return None
@@ -349,10 +617,35 @@ class DownloadService:
         # Initialize queue progress tracking if not already done
         await self._init_queue_progress()
         
+        # Filter out episodes already in pending queue
+        episodes_to_add = []
+        skipped_count = 0
+        seen_in_batch: set = set()  # Track duplicates within this batch
+        for ep in episodes:
+            ep_key = (serie_id, ep.season, ep.episode)
+            if ep_key in self._pending_by_episode or ep_key in seen_in_batch:
+                logger.debug(
+                    "Skipping duplicate episode in queue",
+                    serie_key=serie_id,
+                    season=ep.season,
+                    episode=ep.episode,
+                )
+                skipped_count += 1
+                continue
+            seen_in_batch.add(ep_key)
+            episodes_to_add.append(ep)
+        
+        if skipped_count > 0:
+            logger.info(
+                "Skipped %d duplicate episodes in queue",
+                skipped_count,
+                serie_key=serie_id,
+            )
+        
         created_ids = []
         
         try:
-            for episode in episodes:
+            for episode in episodes_to_add:
                 item = DownloadItem(
                     id=self._generate_item_id(),
                     serie_id=serie_id,
@@ -636,8 +929,12 @@ class DownloadService:
                     "queue_status": queue_status.model_dump(mode="json")
                 },
             )
+            # Reset flag so next queue run re-creates the progress entry
+            self._queue_progress_initialized = False
         else:
             logger.info("Queue processing stopped by user")
+            # Reset flag so next queue run re-creates the progress entry
+            self._queue_progress_initialized = False
     
     async def start_next_download(self) -> Optional[str]:
         """Legacy method - redirects to start_queue_processing.
@@ -658,18 +955,21 @@ class DownloadService:
         self._is_stopped = True
         logger.info("Download processing stopped")
         
-        # Notify via progress service
-        queue_status = await self.get_queue_status()
-        await self._progress_service.update_progress(
-            progress_id="download_queue",
-            message="Queue processing stopped",
-            metadata={
-                "action": "queue_stopped",
-                "is_stopped": True,
-                "queue_status": queue_status.model_dump(mode="json"),
-            },
-            force_broadcast=True,
-        )
+        # Notify via progress service (guard against entry not existing)
+        try:
+            queue_status = await self.get_queue_status()
+            await self._progress_service.update_progress(
+                progress_id="download_queue",
+                message="Queue processing stopped",
+                metadata={
+                    "action": "queue_stopped",
+                    "is_stopped": True,
+                    "queue_status": queue_status.model_dump(mode="json"),
+                },
+                force_broadcast=True,
+            )
+        except Exception as e:
+            logger.warning("Could not update queue progress on stop: %s", e)
 
     async def get_queue_status(self) -> QueueStatus:
         """Get current status of all queues.
@@ -837,17 +1137,16 @@ class DownloadService:
                 if item.retry_count >= self._max_retries:
                     continue
                 
-                # Move back to pending
+                # Move back to pending (retry_count will be incremented
+                # by _process_download when the item fails again)
                 self._failed_items.remove(item)
                 item.status = DownloadStatus.PENDING
-                item.retry_count += 1
                 item.error = None
                 item.progress = None
+                item.retry_count += 1
                 self._add_to_pending_queue(item)
                 retried_ids.append(item.id)
                 
-                # Status is now managed in-memory only
-                
                 logger.info(
                     "Retrying failed item: item_id=%s, retry_count=%d",
                     item.id,
@@ -855,18 +1154,23 @@ class DownloadService:
                 )
             
             if retried_ids:
-                # Notify via progress service
-                queue_status = await self.get_queue_status()
-                await self._progress_service.update_progress(
-                    progress_id="download_queue",
-                    message=f"Retried {len(retried_ids)} failed items",
-                    metadata={
-                        "action": "items_retried",
-                        "retried_ids": retried_ids,
-                        "queue_status": queue_status.model_dump(mode="json"),
-                    },
-                    force_broadcast=True,
-                )
+                # Notify via progress service if available
+                try:
+                    queue_status = await self.get_queue_status()
+                    await self._progress_service.update_progress(
+                        progress_id="download_queue",
+                        message=f"Retried {len(retried_ids)} failed items",
+                        metadata={
+                            "action": "items_retried",
+                            "retried_ids": retried_ids,
+                            "queue_status": queue_status.model_dump(mode="json"),
+                        },
+                        force_broadcast=True,
+                    )
+                except Exception as e:
+                    logger.warning(
+                        "Failed to broadcast retry progress: %s", e
+                    )
             
             return retried_ids
             
@@ -933,18 +1237,36 @@ class DownloadService:
                 
                 self._completed_items.append(item)
                 
-                # Delete completed item from database (status is in-memory)
+                logger.info(
+                    "Download succeeded, cleaning up: item_id=%s, "
+                    "serie_key=%s, S%02dE%02d",
+                    item.id,
+                    item.serie_id,
+                    item.episode.season,
+                    item.episode.episode,
+                )
+                
+                # Delete completed item from download queue database
                 await self._delete_from_database(item.id)
                 
-                # Remove episode from missing episodes list in database
-                await self._remove_episode_from_missing_list(
+                # Mark episode as downloaded in missing episodes list
+                # (both database and in-memory)
+                removed = await self._remove_episode_from_missing_list(
                     series_key=item.serie_id,
                     season=item.episode.season,
                     episode=item.episode.episode,
+                    serie_folder=item.serie_folder,
                 )
                 
                 logger.info(
-                    "Download completed successfully: item_id=%s", item.id
+                    "Download completed successfully: item_id=%s, "
+                    "serie_key=%s, S%02dE%02d, "
+                    "missing_episode_removed=%s",
+                    item.id,
+                    item.serie_id,
+                    item.episode.season,
+                    item.episode.episode,
+                    removed,
                 )
             else:
                 raise AnimeServiceError("Download returned False")
@@ -988,17 +1310,35 @@ class DownloadService:
             item.status = DownloadStatus.FAILED
             item.completed_at = datetime.now(timezone.utc)
             item.error = str(e)
+            
+            # Increment retry count in memory and database
+            item.retry_count += 1
+            await self._increment_retry_in_database(item.id)
+            
             self._failed_items.append(item)
             
             # Set error in database
             await self._set_error_in_database(item.id, str(e))
             
-            logger.error(
-                "Download failed: item_id=%s, error=%s, retry_count=%d",
-                item.id,
-                str(e),
-                item.retry_count,
-            )
+            # Check if max retries exceeded - move to dead-letter
+            if item.retry_count >= self._max_retries:
+                await self._set_status_in_database(
+                    item.id, DownloadStatus.PERMANENTLY_FAILED.value
+                )
+                logger.error(
+                    "Download permanently failed after max retries: "
+                    "item_id=%s, error=%s, retry_count=%d",
+                    item.id,
+                    str(e),
+                    item.retry_count,
+                )
+            else:
+                logger.error(
+                    "Download failed: item_id=%s, error=%s, retry_count=%d",
+                    item.id,
+                    str(e),
+                    item.retry_count,
+                )
             # Note: Failure is already broadcast by AnimeService
             # via ProgressService when SeriesApp fires failed event
         

src/server/services/initialization_service.py

@@ -1,12 +1,14 @@
 """Centralized initialization service for application startup and setup."""
 import asyncio
+import os
 from pathlib import Path
 from typing import Callable, Optional
 
 import structlog
 
 from src.config.settings import settings
-from src.server.services.anime_service import sync_series_from_data_files
+from src.server.services.anime_service import sync_legacy_series_to_db
+from src.server.services.legacy_file_migration import migrate_series_from_files_to_db
 
 logger = structlog.get_logger(__name__)
 
@@ -99,6 +101,151 @@ async def _mark_initial_scan_completed() -> None:
     )
 
 
+async def _check_legacy_migration_status() -> bool:
+    """Check if legacy key/data file migration has been completed.
+
+    Returns:
+        bool: True if migration was completed, False otherwise
+    """
+    return await _check_scan_status(
+        check_method=lambda svc, db: svc.is_migration_legacy_files_completed(db),
+        scan_type="legacy_migration",
+        log_completed_msg="Legacy file migration already completed, skipping",
+        log_not_completed_msg="Legacy file migration not yet run, will check for files"
+    )
+
+
+async def _mark_legacy_migration_completed() -> None:
+    """Mark the legacy file migration as completed in system settings."""
+    await _mark_scan_completed(
+        mark_method=lambda svc, db: svc.mark_migration_legacy_files_completed(db),
+        scan_type="legacy_migration"
+    )
+
+
+async def _check_legacy_key_cleanup_status() -> bool:
+    """Check if legacy key file cleanup has been completed.
+
+    Returns:
+        bool: True if cleanup was completed, False otherwise
+    """
+    return await _check_scan_status(
+        check_method=lambda svc, db: svc.is_legacy_key_cleanup_completed(db),
+        scan_type="legacy_key_cleanup",
+        log_completed_msg="Legacy key file cleanup already completed, skipping",
+        log_not_completed_msg="Legacy key file cleanup not yet run, will clean up key files"
+    )
+
+
+async def _mark_legacy_key_cleanup_completed() -> None:
+    """Mark the legacy key file cleanup as completed in system settings."""
+    await _mark_scan_completed(
+        mark_method=lambda svc, db: svc.mark_legacy_key_cleanup_completed(db),
+        scan_type="legacy_key_cleanup"
+    )
+
+
+async def _migrate_legacy_files() -> int:
+    """Migrate series from legacy key/data files to database.
+
+    Returns:
+        int: Number of series migrated
+    """
+    from src.server.database.connection import get_db_session
+
+    logger.info("Checking for legacy key/data files to migrate...")
+
+    try:
+        async with get_db_session() as db:
+            migrated_count = await migrate_series_from_files_to_db(
+                settings.anime_directory,
+                db
+            )
+
+        if migrated_count > 0:
+            logger.info("Migrated %d series from legacy files", migrated_count)
+        else:
+            logger.info("No series found in legacy files to migrate")
+
+        return migrated_count
+
+    except Exception as e:
+        logger.warning("Failed to migrate legacy files: %s", e)
+        return 0
+
+
+async def _cleanup_legacy_key_files() -> int:
+    """Remove legacy key files from folders that already have DB entries.
+
+    This is a one-time cleanup task that runs at startup after legacy migration.
+    It removes deprecated 'key' files that cause duplicate key errors when
+    folders are renamed, since the DB is now the source of truth.
+
+    Returns:
+        int: Number of key files deleted
+    """
+    from src.server.database.connection import get_db_session
+    from src.server.database.service import AnimeSeriesService
+
+    logger.info("Checking for legacy key files to clean up...")
+
+    if not settings.anime_directory or not os.path.isdir(settings.anime_directory):
+        logger.warning(
+            "Anime directory not configured or does not exist, skipping legacy key cleanup"
+        )
+        return 0
+
+    deleted_count = 0
+    scanned_count = 0
+
+    try:
+        async with get_db_session() as db:
+            # Get all series from DB to know which folders should have key files removed
+            all_series = await AnimeSeriesService.get_all(db)
+
+            # Build a set of known folder names from DB
+            db_folders: set[str] = {series.folder for series in all_series if series.folder}
+
+            for folder_name in db_folders:
+                folder_path = settings.anime_directory / folder_name
+                key_file = folder_path / "key"
+
+                if not key_file.exists():
+                    continue
+
+                scanned_count += 1
+                try:
+                    key_file.unlink()
+                    deleted_count += 1
+                    logger.info(
+                        "Removed legacy key file",
+                        folder=folder_name,
+                        key_file=str(key_file)
+                    )
+                except OSError as exc:
+                    logger.warning(
+                        "Could not remove legacy key file",
+                        folder=folder_name,
+                        key_file=str(key_file),
+                        error=str(exc)
+                    )
+
+    except Exception as e:
+        logger.error(
+            "Legacy key file cleanup failed",
+            error=str(e),
+            exc_info=True
+        )
+        return deleted_count
+
+    logger.info(
+        "Legacy key file cleanup complete",
+        scanned=scanned_count,
+        deleted=deleted_count
+    )
+    return deleted_count
+
+
 async def _sync_anime_folders(progress_service=None) -> int:
     """Scan anime folders and sync series to database.
     
@@ -118,7 +265,7 @@ async def _sync_anime_folders(progress_service=None) -> int:
             metadata={"step_id": "series_sync"}
         )
     
-    sync_count = await sync_series_from_data_files(settings.anime_directory)
+    sync_count = await sync_legacy_series_to_db(settings.anime_directory)
     logger.info("Data file sync complete. Added %d series.", sync_count)
     
     if progress_service:
@@ -181,18 +328,19 @@ async def _validate_anime_directory(progress_service=None) -> bool:
 
 async def perform_initial_setup(progress_service=None):
     """Perform initial setup including series sync and scan completion marking.
-    
+
     This function is called both during application lifespan startup
     and when the setup endpoint is completed. It ensures that:
-    1. Series are synced from data files to database
-    2. Initial scan is marked as completed
-    3. Series are loaded into memory
-    4. NFO scan is performed if configured
-    5. Media scan is performed
-    
+    1. Legacy key/data files are migrated to database (one-time)
+    2. Series are synced from data files to database
+    3. Initial scan is marked as completed
+    4. Series are loaded into memory
+    5. NFO scan is performed if configured
+    6. Media scan is performed
+
     Args:
         progress_service: Optional ProgressService for emitting updates
-    
+
     Returns:
         bool: True if initialization was performed, False if skipped
     """
@@ -225,17 +373,30 @@ async def perform_initial_setup(progress_service=None):
 
     # Perform the actual initialization
     try:
+        # First, run legacy file migration if needed (independent of initial scan)
+        is_legacy_migration_done = await _check_legacy_migration_status()
+        if not is_legacy_migration_done:
+            await _migrate_legacy_files()
+            await _mark_legacy_migration_completed()
+
         # Sync series from anime folders to database
         await _sync_anime_folders(progress_service)
-        
+
+        # Clean up legacy key files from folders that now have DB entries
+        # This runs after migration/sync to ensure DB entries exist before deletion
+        is_key_cleanup_done = await _check_legacy_key_cleanup_status()
+        if not is_key_cleanup_done:
+            await _cleanup_legacy_key_files()
+            await _mark_legacy_key_cleanup_completed()
+
         # Mark the initial scan as completed
         await _mark_initial_scan_completed()
-        
+
         # Load series into memory from database
         await _load_series_into_memory(progress_service)
-        
+
         return True
-        
+
     except (OSError, RuntimeError, ValueError) as e:
         logger.warning("Failed to perform initial setup: %s", e)
         return False
@@ -342,7 +503,7 @@ async def perform_nfo_scan_if_needed(progress_service=None):
             if not settings.tmdb_api_key
             else "Skipped - NFO features disabled"
         )
-        logger.info(f"NFO scan skipped: {message}")
+        logger.info("NFO scan skipped: %s", message)
         
         if progress_service:
             await progress_service.complete_progress(
@@ -377,111 +538,15 @@ async def perform_nfo_scan_if_needed(progress_service=None):
             )
 
 
-_NFO_REPAIR_SEMAPHORE: asyncio.Semaphore = asyncio.Semaphore(3)
-
-
-async def _repair_one_series(series_dir: Path, series_name: str) -> None:
-    """Repair a single series NFO in isolation.
-
-    Creates a fresh :class:`NFOService` and :class:`NfoRepairService` per
-    invocation so that each repair owns its own ``aiohttp`` session/connector
-    and concurrent tasks cannot interfere with each other.
-
-    A module-level semaphore (``_NFO_REPAIR_SEMAPHORE``) limits the number of
-    simultaneous TMDB requests to avoid rate-limiting.
-
-    Any exception is caught and logged so the asyncio task never silently
-    drops an unhandled error.
-
-    Args:
-        series_dir: Absolute path to the series folder.
-        series_name: Human-readable series name for log messages.
-    """
-    from src.core.services.nfo_factory import NFOServiceFactory
-    from src.core.services.nfo_repair_service import NfoRepairService
-
-    async with _NFO_REPAIR_SEMAPHORE:
-        try:
-            factory = NFOServiceFactory()
-            nfo_service = factory.create()
-            repair_service = NfoRepairService(nfo_service)
-            await repair_service.repair_series(series_dir, series_name)
-        except Exception as exc:  # pylint: disable=broad-except
-            logger.error(
-                "NFO repair failed for %s: %s",
-                series_name,
-                exc,
-            )
-
-
-async def perform_nfo_repair_scan(background_loader=None) -> None:
-    """Scan all series folders and repair incomplete tvshow.nfo files.
-
-    Runs on every application startup (not guarded by a run-once DB flag).
-    Checks each subfolder of ``settings.anime_directory`` for a ``tvshow.nfo``
-    and calls ``_repair_one_series`` for every file with absent or empty
-    required tags.
-
-    Each repair task creates its own isolated :class:`NFOService` /
-    :class:`TMDBClient` so concurrent tasks never share an ``aiohttp``
-    session — this prevents "Connector is closed" errors when many repairs
-    run in parallel.  A semaphore caps TMDB concurrency at 3 to stay within
-    rate limits.
-
-    The ``background_loader`` parameter is accepted for backwards-compatibility
-    but is no longer used.
-
-    Args:
-        background_loader: Unused.  Kept to avoid breaking call-sites.
-    """
-    from src.core.services.nfo_repair_service import nfo_needs_repair
-
-    if not settings.tmdb_api_key:
-        logger.warning("NFO repair scan skipped — TMDB API key not configured")
-        return
-    if not settings.anime_directory:
-        logger.warning("NFO repair scan skipped — anime directory not configured")
-        return
-    anime_dir = Path(settings.anime_directory)
-    if not anime_dir.is_dir():
-        logger.warning("NFO repair scan skipped — anime directory not found: %s", anime_dir)
-        return
-
-    queued = 0
-    total = 0
-    for series_dir in sorted(anime_dir.iterdir()):
-        if not series_dir.is_dir():
-            continue
-        nfo_path = series_dir / "tvshow.nfo"
-        if not nfo_path.exists():
-            continue
-        total += 1
-        series_name = series_dir.name
-        if nfo_needs_repair(nfo_path):
-            queued += 1
-            # Each task creates its own NFOService so connectors are isolated.
-            asyncio.create_task(
-                _repair_one_series(series_dir, series_name),
-                name=f"nfo_repair:{series_name}",
-            )
-
-    logger.info(
-        "NFO repair scan complete: %d of %d series queued for repair",
-        queued,
-        total,
-    )
-
-
 async def _check_media_scan_status() -> bool:
     """Check if initial media scan has been completed.
     
     Returns:
         bool: True if media scan was completed, False otherwise
     """
-    return await _check_scan_status(
-        check_method=lambda svc, db: svc.is_initial_media_scan_completed(db),
-        scan_type="media"
-    )
+    # DISABLED: Always return True to skip startup scan
+    # To re-enable, change to: return await _check_scan_status(...)
+    return True
 
 
 async def _mark_media_scan_completed() -> None:

src/server/services/legacy_file_migration.py

@@ -0,0 +1,233 @@
+"""One-time migration service for legacy key and data files.
+
+This module provides functionality to migrate series data from legacy
+file-based storage (key/data files) to the database. The migration is
+designed to be idempotent and run only once per environment.
+"""
+from __future__ import annotations
+
+import json
+import os
+from pathlib import Path
+from typing import Optional
+
+import structlog
+from sqlalchemy.ext.asyncio import AsyncSession
+
+logger = structlog.get_logger(__name__)
+
+
+async def migrate_series_from_files_to_db(
+    anime_dir: str,
+    db: AsyncSession,
+) -> int:
+    """Migrate series from legacy key/data files to database.
+
+    Scans for folders containing legacy 'key' or 'data' files and imports
+    any series not already in the database. The DB version wins if a series
+    exists in both places.
+
+    Args:
+        anime_dir: Path to the anime directory
+        db: Database session
+
+    Returns:
+        Number of series imported
+    """
+    from src.server.database.service import AnimeSeriesService, EpisodeService
+
+    if not anime_dir or not os.path.isdir(anime_dir):
+        logger.warning(
+            "Anime directory does not exist, skipping legacy migration",
+            anime_dir=anime_dir
+        )
+        return 0
+
+    migrated_count = 0
+    scanned_count = 0
+
+    try:
+        for folder_name in os.listdir(anime_dir):
+            folder_path = os.path.join(anime_dir, folder_name)
+
+            if not os.path.isdir(folder_path):
+                continue
+
+            scanned_count += 1
+
+            # Check for 'key' file (single line with series key)
+            key_file = os.path.join(folder_path, "key")
+            # Check for 'data' file (JSON with series metadata)
+            data_file = os.path.join(folder_path, "data")
+
+            series_data: Optional[dict] = None
+
+            # Try to load from 'data' file first (more complete)
+            if os.path.isfile(data_file):
+                series_data = _load_data_file(data_file)
+            elif os.path.isfile(key_file):
+                # Fall back to 'key' file - just the key, need to infer other data
+                series_data = _load_key_file(key_file, folder_name)
+
+            if series_data is None:
+                continue
+
+            key = series_data.get("key")
+            if not key:
+                logger.warning(
+                    "Skipping folder with no valid key",
+                    folder=folder_name
+                )
+                continue
+
+            # Check if already in DB
+            existing = await AnimeSeriesService.get_by_key(db, key)
+            if existing:
+                logger.debug(
+                    "Series already in database, skipping",
+                    key=key,
+                    folder=folder_name
+                )
+                continue
+
+            # Create the series in DB
+            try:
+                name = series_data.get("name") or folder_name
+                site = series_data.get("site", "https://aniworld.to")
+                folder = series_data.get("folder", folder_name)
+                year = series_data.get("year")
+
+                anime_series = await AnimeSeriesService.create(
+                    db=db,
+                    key=key,
+                    name=name,
+                    site=site,
+                    folder=folder,
+                    year=year,
+                )
+
+                # Create episodes if present
+                episode_dict = series_data.get("episodeDict", {})
+                if episode_dict:
+                    for season, episode_numbers in episode_dict.items():
+                        for episode_number in episode_numbers:
+                            await EpisodeService.create(
+                                db=db,
+                                series_id=anime_series.id,
+                                season=season,
+                                episode_number=episode_number,
+                            )
+
+                migrated_count += 1
+                logger.info(
+                    "Migrated series from legacy file",
+                    key=key,
+                    name=name,
+                    folder=folder_name
+                )
+
+            except Exception as e:
+                logger.warning(
+                    "Failed to migrate series from legacy file",
+                    key=key,
+                    folder=folder_name,
+                    error=str(e)
+                )
+
+    except Exception as e:
+        logger.error(
+            "Legacy migration failed",
+            anime_dir=anime_dir,
+            error=str(e),
+            exc_info=True
+        )
+
+    logger.info(
+        "Legacy file migration complete",
+        scanned_folders=scanned_count,
+        migrated=migrated_count
+    )
+    return migrated_count
+
+
+def _load_data_file(data_file_path: str) -> Optional[dict]:
+    """Load and parse a legacy 'data' file (JSON).
+
+    Args:
+        data_file_path: Path to the data file
+
+    Returns:
+        Parsed data dict or None if parsing fails
+    """
+    try:
+        with open(data_file_path, "r", encoding="utf-8") as f:
+            data = json.load(f)
+
+        if not isinstance(data, dict):
+            logger.warning(
+                "Data file is not a dictionary",
+                file=data_file_path
+            )
+            return None
+
+        # Ensure episodeDict has int keys
+        if "episodeDict" in data and isinstance(data["episodeDict"], dict):
+            data["episodeDict"] = {
+                int(k): v for k, v in data["episodeDict"].items()
+            }
+
+        return data
+
+    except json.JSONDecodeError as e:
+        logger.warning(
+            "Failed to parse legacy data file (JSON error)",
+            file=data_file_path,
+            error=str(e)
+        )
+        return None
+    except Exception as e:
+        logger.warning(
+            "Failed to read legacy data file",
+            file=data_file_path,
+            error=str(e)
+        )
+        return None
+
+
+def _load_key_file(key_file_path: str, folder_name: str) -> Optional[dict]:
+    """Load a legacy 'key' file (single line with series key).
+
+    Args:
+        key_file_path: Path to the key file
+        folder_name: Folder name to use as fallback name
+
+    Returns:
+        Data dict with key and inferred fields, or None if loading fails
+    """
+    try:
+        with open(key_file_path, "r", encoding="utf-8") as f:
+            key = f.read().strip()
+
+        if not key:
+            logger.warning(
+                "Key file is empty",
+                file=key_file_path
+            )
+            return None
+
+        # Infer basic data from key file
+        return {
+            "key": key,
+            "name": folder_name,
+            "site": "https://aniworld.to",
+            "folder": folder_name,
+            "episodeDict": {},
+        }
+
+    except Exception as e:
+        logger.warning(
+            "Failed to read legacy key file",
+            file=key_file_path,
+            error=str(e)
+        )
+        return None

src/server/services/notification_service.py

@@ -151,7 +151,7 @@ class EmailNotificationService:
                 start_tls=True,
             )
 
-            logger.info(f"Email notification sent to {to_address}")
+            logger.info("Email notification sent to %s", to_address)
             return True
 
         except ImportError:
@@ -160,7 +160,7 @@ class EmailNotificationService:
             )
             return False
         except Exception as e:
-            logger.error(f"Failed to send email notification: {e}")
+            logger.error("Failed to send email notification: %s", e)
             return False
 
 
@@ -205,7 +205,7 @@ class WebhookNotificationService:
                         timeout=aiohttp.ClientTimeout(total=self.timeout),
                     ) as response:
                         if response.status < 400:
-                            logger.info(f"Webhook notification sent to {url}")
+                            logger.info("Webhook notification sent to %s", url)
                             return True
                         else:
                             logger.warning(
@@ -213,9 +213,9 @@ class WebhookNotificationService:
                             )
 
             except asyncio.TimeoutError:
-                logger.warning(f"Webhook timeout (attempt {attempt + 1}/{self.max_retries}): {url}")
+                logger.warning("Webhook timeout (attempt %s/%s): %s", attempt + 1, self.max_retries, url)
             except Exception as e:
-                logger.error(f"Failed to send webhook (attempt {attempt + 1}/{self.max_retries}): {e}")
+                logger.error("Failed to send webhook (attempt %s/%s): %s", attempt + 1, self.max_retries, e)
 
             if attempt < self.max_retries - 1:
                 await asyncio.sleep(2 ** attempt)  # Exponential backoff
@@ -436,7 +436,7 @@ class NotificationService:
                 await self.in_app_service.add_notification(notification)
                 results["in_app"] = True
             except Exception as e:
-                logger.error(f"Failed to send in-app notification: {e}")
+                logger.error("Failed to send in-app notification: %s", e)
                 results["in_app"] = False
 
         # Send email notification
@@ -452,7 +452,7 @@ class NotificationService:
                 )
                 results["email"] = success
             except Exception as e:
-                logger.error(f"Failed to send email notification: {e}")
+                logger.error("Failed to send email notification: %s", e)
                 results["email"] = False
 
         # Send webhook notifications
@@ -476,7 +476,7 @@ class NotificationService:
                     success = await self.webhook_service.send_webhook(str(url), payload)
                     webhook_results.append(success)
                 except Exception as e:
-                    logger.error(f"Failed to send webhook notification to {url}: {e}")
+                    logger.error("Failed to send webhook notification to %s: %s", url, e)
                     webhook_results.append(False)
 
             results["webhook"] = all(webhook_results) if webhook_results else False

src/server/services/queue_repository.py

@@ -83,15 +83,12 @@ class QueueRepository:
     ) -> DownloadItem:
         """Convert database model to DownloadItem.
 
-        Note: Since the database model is simplified, status, priority,
-        progress, and retry_count default to initial values.
-
         Args:
             db_item: SQLAlchemy download queue item
             item_id: Optional override for item ID
 
         Returns:
-            Pydantic download item with default status/priority
+            Pydantic download item with status/retry_count from database
         """
         # Get episode info from the related Episode object
         episode = db_item.episode
@@ -109,14 +106,14 @@ class QueueRepository:
             serie_folder=series.folder if series else "",
             serie_name=series.name if series else "",
             episode=episode_identifier,
-            status=DownloadStatus.PENDING,  # Default - managed in-memory
-            priority=DownloadPriority.NORMAL,  # Default - managed in-memory
+            status=DownloadStatus(db_item.status),  # From database
+            priority=DownloadPriority.NORMAL,  # Managed in-memory
             added_at=db_item.created_at or datetime.now(timezone.utc),
             started_at=db_item.started_at,
             completed_at=db_item.completed_at,
             progress=None,  # Managed in-memory
             error=db_item.error_message,
-            retry_count=0,  # Managed in-memory
+            retry_count=db_item.retry_count,  # From database
             source_url=db_item.download_url,
         )
 
@@ -350,6 +347,110 @@ class QueueRepository:
         finally:
             if manage_session:
                 await session.close()
+    
+    async def set_status(
+        self,
+        item_id: str,
+        status: str,
+        db: Optional[AsyncSession] = None,
+    ) -> bool:
+        """Set status on a download item.
+
+        Args:
+            item_id: Download item ID
+            status: New status value
+            db: Optional existing database session
+
+        Returns:
+            True if update succeeded, False if item not found
+
+        Raises:
+            QueueRepositoryError: If update fails
+        """
+        session = db or self._db_session_factory()
+        manage_session = db is None
+
+        try:
+            result = await DownloadQueueService.set_status(
+                session,
+                int(item_id),
+                status,
+            )
+
+            if manage_session:
+                await session.commit()
+
+            success = result is not None
+
+            if success:
+                logger.debug(
+                    "Set status on queue item: item_id=%s, status=%s",
+                    item_id,
+                    status,
+                )
+
+            return success
+
+        except ValueError:
+            return False
+        except Exception as e:
+            if manage_session:
+                await session.rollback()
+            logger.error("Failed to set status: %s", e)
+            raise QueueRepositoryError(f"Failed to set status: {e}") from e
+        finally:
+            if manage_session:
+                await session.close()
+    
+    async def increment_retry(
+        self,
+        item_id: str,
+        db: Optional[AsyncSession] = None,
+    ) -> bool:
+        """Increment retry count on a download item.
+
+        Args:
+            item_id: Download item ID
+            db: Optional existing database session
+
+        Returns:
+            True if update succeeded, False if item not found
+
+        Raises:
+            QueueRepositoryError: If update fails
+        """
+        session = db or self._db_session_factory()
+        manage_session = db is None
+
+        try:
+            result = await DownloadQueueService.increment_retry_count(
+                session,
+                int(item_id),
+            )
+
+            if manage_session:
+                await session.commit()
+
+            success = result is not None
+
+            if success:
+                logger.debug(
+                    "Incremented retry count on queue item: item_id=%s",
+                    item_id,
+                )
+
+            return success
+
+        except ValueError:
+            return False
+        except Exception as e:
+            if manage_session:
+                await session.rollback()
+            logger.error("Failed to increment retry: %s", e)
+            raise QueueRepositoryError(f"Failed to increment retry: {e}") from e
+        finally:
+            if manage_session:
+                await session.close()
 
     async def delete_item(
         self,

src/server/services/rescan_service.py

@@ -0,0 +1,291 @@
+"""Rescan service — orchestrates library rescans.
+
+This service handles the actual scan/rescan logic:
+
+- Library rescan via anime_service
+- Auto-download of missing episodes (if enabled)
+- Folder maintenance scan (if enabled)
+- Orphaned folder key resolution
+
+SchedulerService only calls RescanService.execute() — it does not
+know about the internal steps.
+"""
+from __future__ import annotations
+
+import logging
+from datetime import datetime, timedelta, timezone
+from typing import List, Optional
+
+from src.server.models.config import SchedulerConfig
+
+logger = logging.getLogger(__name__)
+
+_AUTO_DOWNLOAD_COOLDOWN_SECONDS = 300  # 5 minutes
+
+
+class RescanService:
+    """Orchestrates all rescan-related operations.
+
+    Encapsulates the full post-rescan workflow so SchedulerService
+    only needs to call a single execute() method.
+    """
+
+    def __init__(self, config: Optional[SchedulerConfig] = None) -> None:
+        """Initialize the rescan service.
+
+        Args:
+            config: Optional scheduler config. If None, operations that depend
+                on config flags (auto_download, folder_scan) will be skipped.
+        """
+        self._config = config
+        self._last_scan_time: Optional[datetime] = None
+        self._last_auto_download_time: Optional[datetime] = None
+
+    @property
+    def last_scan_time(self) -> Optional[datetime]:
+        return self._last_scan_time
+
+    # ------------------------------------------------------------------
+    # Public entry point
+    # ------------------------------------------------------------------
+
+    async def execute(self) -> dict:
+        """Execute the full rescan workflow.
+
+        Runs in order:
+        1. anime_service.rescan()
+        2. auto-download (if enabled)
+        3. folder scan (if enabled)
+        4. key resolution scan (always, if anime_directory configured)
+
+        Returns:
+            Dict with duration and counts for each step.
+        """
+        from src.server.services.websocket_service import get_websocket_service
+
+        scan_start = datetime.now(timezone.utc)
+        results = {
+            "started_at": scan_start.isoformat(),
+            "duration_seconds": 0.0,
+            "rescan_completed": False,
+            "auto_download_queued": 0,
+            "folder_scan_completed": False,
+            "key_resolution": {"resolved": 0, "skipped": 0, "errors": 0},
+        }
+
+        await self._broadcast("scheduled_rescan_started", {"timestamp": scan_start.isoformat()})
+
+        try:
+            # 1. Main library rescan
+            await self._run_rescan()
+            results["rescan_completed"] = True
+
+            # 2. Auto-download
+            if self._config and self._config.auto_download_after_rescan:
+                try:
+                    queued = await self._run_auto_download()
+                    results["auto_download_queued"] = queued
+                    await self._broadcast("auto_download_started", {"queued_count": queued})
+                except Exception as exc:
+                    logger.error("Auto-download failed: %s", exc, exc_info=True)
+                    await self._broadcast("auto_download_error", {"error": str(exc)})
+
+            # 3. Folder scan
+            if self._config and self._config.folder_scan_enabled:
+                try:
+                    await self._run_folder_scan()
+                    results["folder_scan_completed"] = True
+                except Exception as exc:
+                    logger.error("Folder scan failed: %s", exc, exc_info=True)
+                    await self._broadcast("folder_scan_error", {"error": str(exc)})
+
+            # 4. Key resolution scan
+            try:
+                key_stats = await self._run_key_resolution()
+                results["key_resolution"] = key_stats
+            except Exception as exc:
+                logger.error("Key resolution scan failed: %s", exc, exc_info=True)
+
+            self._last_scan_time = datetime.now(timezone.utc)
+            results["duration_seconds"] = (self._last_scan_time - scan_start).total_seconds()
+
+            await self._broadcast(
+                "scheduled_rescan_completed",
+                {
+                    "timestamp": self._last_scan_time.isoformat(),
+                    "duration_seconds": results["duration_seconds"],
+                },
+            )
+
+            logger.info(
+                "Scheduled library rescan completed: duration=%.2fs",
+                results["duration_seconds"],
+            )
+
+        except Exception as exc:
+            logger.error("Scheduled rescan failed: %s", exc, exc_info=True)
+            await self._broadcast(
+                "scheduled_rescan_error",
+                {"error": str(exc), "timestamp": datetime.now(timezone.utc).isoformat()},
+            )
+            raise
+
+        return results
+
+    # ------------------------------------------------------------------
+    # Step 1: Library rescan
+    # ------------------------------------------------------------------
+
+    async def _run_rescan(self) -> None:
+        """Run the anime service rescan."""
+        from src.server.utils.dependencies import get_anime_service
+
+        anime_service = get_anime_service()
+        logger.info("Anime service obtained, calling anime_service.rescan()...")
+        await anime_service.rescan()
+        logger.info("anime_service.rescan() completed")
+
+    # ------------------------------------------------------------------
+    # Step 2: Auto-download
+    # ------------------------------------------------------------------
+
+    async def _run_auto_download(self) -> int:
+        """Queue and start downloads for all series with missing episodes.
+
+        Returns:
+            Number of episodes queued.
+        """
+        from src.server.models.download import EpisodeIdentifier
+        from src.server.utils.dependencies import (
+            get_anime_service,
+            get_download_service,
+        )
+
+        # Cooldown check to prevent rapid re-triggers
+        now = datetime.now(timezone.utc)
+        if self._last_auto_download_time is not None:
+            elapsed = now - self._last_auto_download_time
+            if elapsed < timedelta(seconds=_AUTO_DOWNLOAD_COOLDOWN_SECONDS):
+                logger.debug(
+                    "Auto-download skipped: cooldown active (elapsed=%.1fs cooldown=%ds)",
+                    elapsed.total_seconds(),
+                    _AUTO_DOWNLOAD_COOLDOWN_SECONDS,
+                )
+                return 0
+
+        anime_service = get_anime_service()
+        download_service = get_download_service()
+
+        series_list = anime_service._cached_list_missing()
+        queued_count = 0
+
+        for series in series_list:
+            episode_dict: dict = series.get("episodeDict") or {}
+            if not episode_dict:
+                continue
+
+            episodes: List[EpisodeIdentifier] = []
+            for season_str, ep_numbers in episode_dict.items():
+                for ep_num in ep_numbers:
+                    episodes.append(
+                        EpisodeIdentifier(season=int(season_str), episode=int(ep_num))
+                    )
+
+            if not episodes:
+                continue
+
+            await download_service.add_to_queue(
+                serie_id=series.get("key", ""),
+                serie_folder=series.get("folder", series.get("name", "")),
+                serie_name=series.get("name", ""),
+                episodes=episodes,
+            )
+            queued_count += len(episodes)
+            logger.info(
+                "Auto-download queued episodes for series=%s count=%d",
+                series.get("key"),
+                len(episodes),
+            )
+
+        if queued_count:
+            await download_service.start_queue_processing()
+            logger.info("Auto-download queue processing started: queued=%d", queued_count)
+
+        self._last_auto_download_time = datetime.now(timezone.utc)
+        logger.info("Auto-download completed: queued_count=%d", queued_count)
+        return queued_count
+
+    # ------------------------------------------------------------------
+    # Step 3: Folder scan
+    # ------------------------------------------------------------------
+
+    async def _run_folder_scan(self) -> None:
+        """Run the folder scan maintenance task."""
+        from src.server.services.scheduler.folder_scan_service import FolderScanService
+
+        folder_scan_service = FolderScanService()
+        await folder_scan_service.run_folder_scan()
+        logger.info("Folder scan completed successfully")
+
+    # ------------------------------------------------------------------
+    # Step 4: Key resolution
+    # ------------------------------------------------------------------
+
+    async def _run_key_resolution(self) -> dict:
+        """Run the orphaned folder key resolution scan.
+
+        Returns:
+            Dict with resolved/skipped/errors counts.
+        """
+        from src.server.services.scheduler.key_resolution_service import (
+            perform_key_resolution_scan,
+        )
+
+        key_stats = await perform_key_resolution_scan()
+        logger.info(
+            "Key resolution scan completed: resolved=%d, skipped=%d, errors=%d",
+            key_stats["resolved"],
+            key_stats["skipped"],
+            key_stats["errors"],
+        )
+        return key_stats
+
+    # ------------------------------------------------------------------
+    # Private helpers
+    # ------------------------------------------------------------------
+
+    async def _broadcast(self, event_type: str, data: dict) -> None:
+        """Broadcast a WebSocket event to all connected clients."""
+        try:
+            from src.server.services.websocket_service import get_websocket_service
+
+            ws_service = get_websocket_service()
+            await ws_service.manager.broadcast({"type": event_type, "data": data})
+        except Exception as exc:
+            logger.warning(
+                "WebSocket broadcast failed: event=%s error=%s", event_type, exc
+            )
+
+
+# ---------------------------------------------------------------------------
+# Module-level singleton
+# ---------------------------------------------------------------------------
+
+_rescan_service: Optional[RescanService] = None
+
+
+def get_rescan_service(config: Optional[SchedulerConfig] = None) -> RescanService:
+    """Return a RescanService singleton (or create with optional config)."""
+    global _rescan_service
+    if _rescan_service is None or config is not None:
+        _rescan_service = RescanService(config=config)
+        logger.debug("Created new RescanService singleton")
+    else:
+        logger.debug("Returning existing RescanService singleton")
+    return _rescan_service
+
+
+def reset_rescan_service() -> None:
+    """Reset the singleton (used in tests)."""
+    global _rescan_service
+    _rescan_service = None

src/server/services/scheduler/__init__.py

@@ -0,0 +1,45 @@
+"""Scheduler services package.
+
+Contains scheduler orchestration and rescan coordination:
+
+- scheduler_service: Cron-based scheduler using APScheduler
+- rescan_orchestrator: Legacy alias for RescanService (for backward compatibility)
+"""
+from __future__ import annotations
+
+from src.server.services.rescan_service import (
+                                                RescanService,
+                                                get_rescan_service,
+                                                reset_rescan_service,
+)
+
+# Backward compatibility alias
+from src.server.services.scheduler.rescan_orchestrator import (
+                                                RescanOrchestrator,
+                                                get_rescan_orchestrator,
+                                                reset_rescan_orchestrator,
+)
+from src.server.services.scheduler.scheduler_service import (
+                                                SchedulerService,
+                                                SchedulerServiceError,
+                                                get_scheduler_service,
+                                                reset_scheduler_service,
+)
+
+__all__ = [
+    # RescanService (new location)
+    "RescanService",
+    "get_rescan_service",
+    "reset_rescan_service",
+    # Scheduler
+    "SchedulerService",
+    "SchedulerServiceError",
+    "get_scheduler_service",
+    "reset_scheduler_service",
+    # Backward compatibility
+    "RescanOrchestrator",
+    "get_rescan_orchestrator",
+    "reset_rescan_orchestrator",
+    # Sub-services (still in scheduler folder)
+    "folder_rename_service",
+]

src/server/services/scheduler/folder_rename_service.py

@@ -0,0 +1,739 @@
+"""Folder rename service for validating and renaming series folders.
+
+After NFO repair, this service iterates over every subfolder in
+``settings.anime_directory`` that contains a ``tvshow.nfo``. For each
+folder it parses the NFO to extract ``<title>`` and ``<year>``, computes
+the expected folder name ``f"{title} ({year})"``, sanitises it for
+filesystem safety, and renames the folder if the current name differs.
+
+Database records (``AnimeSeries.folder``, ``Episode.file_path``,
+``DownloadQueueItem.file_destination``) are updated atomically to
+reflect the new paths.
+"""
+from __future__ import annotations
+
+import logging
+import re
+import shutil
+from collections import defaultdict
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Optional
+
+from lxml import etree
+
+from src.config.settings import settings
+from src.server.database.connection import get_db_session
+from src.server.database.service import (
+    AnimeSeriesService,
+    DownloadQueueService,
+    EpisodeService,
+)
+from src.server.utils.dependencies import get_download_service
+from src.server.utils.filesystem import sanitize_folder_name
+
+logger = logging.getLogger(__name__)
+
+# Pre-compiled pattern for stripping existing year suffixes
+_YEAR_SUFFIX_PATTERN = re.compile(r'(\s*\(\d{4}\))+\s*$')
+
+
+@dataclass
+class DuplicateGroup:
+    """Represents a group of duplicate folders for the same series.
+
+    Attributes:
+        key: The series key (folder name before rename).
+        folders: List of folder paths that map to this series.
+        nfo_paths: List of corresponding NFO file paths.
+    """
+
+    key: str
+    folders: list[str]
+    nfo_paths: list[Path]
+
+    @property
+    def count(self) -> int:
+        return len(self.folders)
+
+    def __repr__(self) -> str:
+        return f"DuplicateGroup(key={self.key!r}, folders={self.folders})"
+
+
+@dataclass
+class RenameStats:
+    """Statistics from a folder rename operation."""
+
+    scanned: int = 0
+    renamed: int = 0
+    skipped: int = 0
+    errors: int = 0
+
+    def to_dict(self) -> dict[str, int]:
+        return {"scanned": self.scanned, "renamed": self.renamed, "skipped": self.skipped, "errors": self.errors}
+
+
+def _scan_for_pre_existing_duplicates(anime_dir: Path) -> list[DuplicateGroup]:
+    """Scan anime directory for pre-existing duplicate folders.
+
+    Groups folders by the series key extracted from their NFO files.
+    Folders with the same title+year (same expected name) are flagged as duplicates.
+
+    Args:
+        anime_dir: Path to the anime directory to scan.
+
+    Returns:
+        List of DuplicateGroup objects, one per series with duplicate folders.
+    """
+    groups: dict[str, list[tuple[str, Path]]] = defaultdict(list)
+
+    for series_dir in anime_dir.iterdir():
+        if not series_dir.is_dir():
+            continue
+        nfo_path = series_dir / "tvshow.nfo"
+        if not nfo_path.exists():
+            continue
+        title, year = _parse_nfo_title_and_year(nfo_path)
+        if not title or not year:
+            continue
+        expected_name = _compute_expected_folder_name(title, year)
+        groups[expected_name].append((series_dir.name, nfo_path))
+
+    duplicates = []
+    for key, items in groups.items():
+        if len(items) > 1:
+            folders = [item[0] for item in items]
+            nfo_paths = [item[1] for item in items]
+            duplicates.append(DuplicateGroup(key=key, folders=folders, nfo_paths=nfo_paths))
+
+    return duplicates
+
+
+def _try_merge_duplicate_group(group: DuplicateGroup, dry_run: bool = False) -> bool:
+    """Attempt to merge a duplicate group automatically.
+
+    Uses the first folder as the canonical one and removes others if they are
+    empty or contain only symlinks.
+
+    Args:
+        group: The DuplicateGroup to merge.
+        dry_run: If True, only log actions without executing them.
+
+    Returns:
+        True if merge was successful, False otherwise.
+    """
+    if len(group.folders) < 2:
+        return True
+
+    canonical = group.folders[0]
+    to_remove = group.folders[1:]
+
+    for folder in to_remove:
+        folder_path = group.nfo_paths[0].parent.parent / folder
+        if not folder_path.exists():
+            continue
+
+        try:
+            contents = list(folder_path.iterdir())
+        except PermissionError:
+            logger.warning("Permission denied accessing %s, skip merge", folder_path)
+            return False
+        except OSError:
+            return False
+
+        if not contents:
+            if dry_run:
+                logger.info("[DRY-RUN] Would delete empty duplicate folder: %s", folder_path)
+            else:
+                try:
+                    folder_path.rmdir()
+                    logger.info("Deleted empty duplicate folder: %s", folder_path)
+                except OSError:
+                    return False
+            continue
+
+        canonical_path = folder_path.parent / canonical
+        all_symlinks = all(
+            item.is_symlink() and item.resolve() == canonical_path.resolve()
+            for item in contents
+        )
+        if all_symlinks:
+            if dry_run:
+                logger.info("[DRY-RUN] Would remove symlinks in duplicate folder: %s", folder_path)
+            else:
+                for item in contents:
+                    item.unlink()
+                try:
+                    folder_path.rmdir()
+                    logger.info("Removed symlink-only duplicate folder: %s", folder_path)
+                except OSError:
+                    return False
+            continue
+
+        logger.warning(
+            "Cannot auto-merge duplicate folders for '%s': %s (manual merge required)",
+            group.key,
+            [canonical] + to_remove,
+        )
+        return False
+
+    return True
+
+
+def _parse_nfo_title_and_year(nfo_path: Path) -> tuple[Optional[str], Optional[str]]:
+    """Parse a tvshow.nfo and return (title, year) text values.
+
+    Args:
+        nfo_path: Absolute path to the ``tvshow.nfo`` file.
+
+    Returns:
+        Tuple of (title, year) where either may be ``None`` if missing
+        or empty.
+    """
+    try:
+        tree = etree.parse(str(nfo_path))
+        root = tree.getroot()
+
+        title_elem = root.find("./title")
+        year_elem = root.find("./year")
+
+        title = title_elem.text.strip() if title_elem is not None and title_elem.text and title_elem.text.strip() else None
+        year = year_elem.text.strip() if year_elem is not None and year_elem.text and year_elem.text.strip() else None
+
+        return title, year
+    except etree.XMLSyntaxError as exc:
+        logger.warning("Malformed XML in %s: %s", nfo_path, exc)
+        return None, None
+    except Exception as exc:
+        logger.warning("Unexpected error parsing %s: %s", nfo_path, exc)
+        return None, None
+
+
+def _compute_expected_folder_name(title: str, year: str) -> str:
+    """Compute the expected folder name from title and year.
+
+    Removes any existing year suffixes (e.g., "(2021)") before adding the
+    canonical one to prevent duplication across multiple folder rename runs.
+
+    Args:
+        title: Series title from NFO.
+        year: Release year from NFO.
+
+    Returns:
+        Sanitised folder name in the format ``"{title} ({year})"``.
+    """
+    clean_title = _YEAR_SUFFIX_PATTERN.sub('', title).strip()
+    year_suffix = f" ({year})"
+    raw_name = f"{clean_title}{year_suffix}"
+    return sanitize_folder_name(raw_name)
+
+
+def _is_series_being_downloaded(series_folder: str) -> bool:
+    """Check whether the given series has an active or pending download.
+
+    Args:
+        series_folder: The series folder name (as stored in the DB).
+
+    Returns:
+        ``True`` if the series appears in the active download or the
+        pending queue.
+    """
+    try:
+        download_service = get_download_service()
+        active = download_service._active_download
+        if active and active.serie_folder == series_folder:
+            return True
+        for item in download_service._pending_queue:
+            if item.serie_folder == series_folder:
+                return True
+        return False
+    except Exception as exc:
+        logger.warning(
+            "Could not check download status for %s: %s", series_folder, exc
+        )
+        return True
+
+
+def _remove_key_file(path: Path) -> None:
+    """Remove legacy 'key' file from a series folder.
+
+    Args:
+        path: Path to the series folder.
+    """
+    key_file = path / "key"
+    if key_file.exists():
+        try:
+            key_file.unlink()
+            logger.info("Removed legacy 'key' file after rename: %s", key_file)
+        except OSError as exc:
+            logger.warning("Could not remove legacy 'key' file %s: %s", key_file, exc)
+
+
+def _move_file(item: Path, dest: Path) -> bool:
+    """Move a single file or directory to destination.
+
+    Args:
+        item: Source path to move.
+        dest: Destination path.
+
+    Returns:
+        True if move succeeded, False otherwise.
+    """
+    try:
+        item.rename(dest)
+        logger.debug("Moved %s → %s", item, dest)
+        return True
+    except PermissionError as exc:
+        logger.warning("Permission denied moving %s: %s", item, exc)
+        return False
+    except OSError as exc:
+        logger.warning("OS error moving %s: %s", item, exc)
+        return False
+
+
+def _cleanup_orphaned_folder(old_path: Path, new_path: Path, dry_run: bool = False) -> bool:
+    """Clean up orphaned folder after successful rename.
+
+    After a folder is successfully renamed to new_path, this function checks
+    if the old_path still exists (orphaned folder) and removes it. If the
+    old folder contains files, they are moved to new_path before deletion.
+
+    Args:
+        old_path: The original folder path before rename.
+        new_path: The new folder path after rename.
+        dry_run: If True, only log actions without executing them.
+
+    Returns:
+        True if old folder was cleaned up (or would be in dry-run mode),
+        False if old folder does not exist or cleanup failed.
+    """
+    if not old_path.exists():
+        logger.debug("Old folder does not exist, no cleanup needed: %s", old_path)
+        return False
+
+    try:
+        contents = list(old_path.iterdir())
+    except PermissionError as exc:
+        logger.warning("Permission denied accessing old folder %s: %s", old_path, exc)
+        return False
+    except OSError as exc:
+        logger.warning("OS error accessing old folder %s: %s", old_path, exc)
+        return False
+
+    if not contents:
+        if dry_run:
+            logger.info("[DRY-RUN] Would delete empty orphaned folder: %s", old_path)
+            return True
+        try:
+            old_path.rmdir()
+            logger.info("Deleted empty orphaned folder: %s", old_path)
+            return True
+        except PermissionError as exc:
+            logger.warning("Permission denied deleting folder %s: %s", old_path, exc)
+            return False
+        except OSError as exc:
+            logger.warning("OS error deleting folder %s: %s", old_path, exc)
+            return False
+
+    if dry_run:
+        logger.info("[DRY-RUN] Would move %d files from orphaned folder %s to %s",
+                    len(contents), old_path, new_path)
+        for item in contents:
+            logger.info("[DRY-RUN] Would move: %s → %s", item, new_path / item.name)
+        logger.info("[DRY-RUN] Would then delete orphaned folder: %s", old_path)
+        return True
+
+    files_moved = 0
+    errors = 0
+    for item in contents:
+        if not _move_file(item, new_path / item.name):
+            errors += 1
+        else:
+            files_moved += 1
+
+    if files_moved > 0:
+        logger.info("Moved %d files from orphaned folder to %s", files_moved, new_path)
+
+    try:
+        old_path.rmdir()
+        logger.info("Deleted orphaned folder after moving contents: %s", old_path)
+        return errors == 0
+    except OSError as exc:
+        logger.warning("Could not delete orphaned folder %s (may not be empty): %s", old_path, exc)
+        return False
+
+
+async def _update_series_folder(db, series, new_folder: str) -> None:
+    """Update AnimeSeries.folder in the database.
+
+    Args:
+        db: Database session.
+        series: The AnimeSeries instance to update.
+        new_folder: New folder name.
+    """
+    if series is None:
+        return
+
+    await AnimeSeriesService.update(db, series.id, folder=new_folder)
+    logger.info("Updated AnimeSeries.folder: %s (id=%s)", new_folder, series.id)
+
+
+def _update_episode_paths(episodes, old_series_path: Path, new_series_path: Path) -> None:
+    """Update Episode.file_path for all episodes of a series.
+
+    Args:
+        episodes: List of Episode instances.
+        old_series_path: Path to the old series folder.
+        new_series_path: Path to the new series folder.
+    """
+    for episode in episodes:
+        if not episode.file_path:
+            continue
+        old_file_path = Path(episode.file_path)
+        try:
+            old_file_path.relative_to(old_series_path)
+            new_file_path = new_series_path / old_file_path.relative_to(old_series_path)
+            episode.file_path = str(new_file_path)
+            logger.debug("Updated Episode.file_path: %s → %s", old_file_path, new_file_path)
+        except ValueError:
+            pass
+
+
+def _update_queue_destinations(
+    queue_items,
+    series_id,
+    old_series_path: Path,
+    new_series_path: Path,
+) -> None:
+    """Update DownloadQueueItem.file_destination for pending items.
+
+    Args:
+        queue_items: List of DownloadQueueItem instances.
+        series_id: ID of the series to filter by.
+        old_series_path: Path to the old series folder.
+        new_series_path: Path to the new series folder.
+    """
+    for item in queue_items:
+        if item.series_id != series_id or not item.file_destination:
+            continue
+        old_dest = Path(item.file_destination)
+        try:
+            old_dest.relative_to(old_series_path)
+            new_dest = new_series_path / old_dest.relative_to(old_series_path)
+            item.file_destination = str(new_dest)
+            logger.debug("Updated DownloadQueueItem.file_destination: %s → %s", old_dest, new_dest)
+        except ValueError:
+            pass
+
+
+async def _update_database_paths(
+    old_folder: str,
+    new_folder: str,
+    anime_dir: Path,
+) -> None:
+    """Update all database records that reference the old folder path.
+
+    Updates:
+    - ``AnimeSeries.folder`` → ``new_folder``
+    - ``Episode.file_path`` → adjusted to new folder
+    - ``DownloadQueueItem.file_destination`` → adjusted to new folder
+
+    Args:
+        old_folder: Previous folder name.
+        new_folder: New folder name.
+        anime_dir: Root anime directory path.
+    """
+    old_series_path = anime_dir / old_folder
+    new_series_path = anime_dir / new_folder
+
+    async with get_db_session() as db:
+        series = await AnimeSeriesService.get_by_folder(db, old_folder)
+        if series is None:
+            all_series = await AnimeSeriesService.get_all(db)
+            for s in all_series:
+                if s.folder == old_folder:
+                    series = s
+                    break
+
+        await _update_series_folder(db, series, new_folder)
+
+        if series is None:
+            return
+
+        episodes = await EpisodeService.get_by_series(db, series.id)
+        _update_episode_paths(episodes, old_series_path, new_series_path)
+
+        await db.flush()
+
+        queue_items = await DownloadQueueService.get_all(db, with_series=True)
+        _update_queue_destinations(queue_items, series.id, old_series_path, new_series_path)
+
+        await db.flush()
+        logger.info("Database paths updated for series '%s' → '%s'", old_folder, new_folder)
+
+
+def _remove_duplicate_target_folder(
+    series_dir: Path,
+    current_name: str,
+    expected_name: str,
+    expected_path: Path,
+) -> bool:
+    """Handle the case where the target folder already exists.
+
+    Removes the source folder and its DB record to avoid orphaning
+    episodes/downloads.
+
+    Args:
+        series_dir: Path to the series directory being processed.
+        current_name: Current folder name.
+        expected_name: Expected folder name.
+        expected_path: Path to the expected (target) folder.
+
+    Returns:
+        True if folder was removed successfully, False otherwise.
+    """
+    logger.warning(
+        "Cannot rename '%s' → '%s' — target already exists",
+        current_name,
+        expected_name,
+    )
+    try:
+        try:
+            contents = list(series_dir.iterdir())
+            logger.warning(
+                "REMOVING folder '%s' with %d items — target '%s' already exists",
+                current_name,
+                len(contents),
+                expected_name,
+            )
+            for item in contents:
+                logger.warning("  Would remove: %s", item)
+        except OSError as exc:
+            logger.warning(
+                "Could not list contents of folder '%s' before removal: %s",
+                current_name,
+                exc,
+            )
+
+        shutil.rmtree(series_dir)
+        logger.info(
+            "Removed source folder '%s' — series already exists at target",
+            current_name,
+        )
+
+        # Delete source DB record using synchronous helper
+        _delete_series_db_record(current_name, expected_name)
+
+        return True
+    except OSError as exc:
+        logger.error("Failed to remove source folder '%s': %s", current_name, exc)
+        return False
+
+
+def _delete_series_db_record(current_name: str, expected_name: str) -> None:
+    """Delete the series DB record for a folder that was removed.
+
+    Args:
+        current_name: The folder name to look up in the DB.
+        expected_name: The target folder name (for logging).
+    """
+    try:
+        import asyncio
+        asyncio.run(_delete_series_db_record_async(current_name, expected_name))
+    except Exception as exc:
+        logger.warning(
+            "Could not delete DB record for '%s': %s",
+            current_name,
+            exc,
+        )
+
+
+async def _delete_series_db_record_async(current_name: str, expected_name: str) -> None:
+    """Async helper to delete series DB record.
+
+    Args:
+        current_name: The folder name to look up.
+        expected_name: The target folder name (for logging).
+    """
+    async with get_db_session() as db:
+        source_series = await AnimeSeriesService.get_by_folder(db, current_name)
+        if source_series is None:
+            all_series = await AnimeSeriesService.get_all(db)
+            for s in all_series:
+                if s.folder == current_name:
+                    source_series = s
+                    break
+        if source_series is not None:
+            await AnimeSeriesService.delete(db, source_series.id)
+            logger.info(
+                "Deleted source DB record for '%s' (id=%s) — target folder '%s' retains DB record",
+                current_name,
+                source_series.id,
+                expected_name,
+            )
+        else:
+            logger.info(
+                "No DB record found for source folder '%s' — folder removed only",
+                current_name,
+            )
+
+
+async def validate_and_rename_series_folders(dry_run: bool = False) -> dict[str, int]:
+    """Validate and rename series folders to match NFO metadata.
+
+    Iterates over every subfolder in ``settings.anime_directory`` that
+    contains a ``tvshow.nfo``. For each folder:
+
+    1. Parse the NFO to extract ``<title>`` and ``<year>``.
+    2. Compute the expected folder name: ``f"{title} ({year})"``.
+    3. Sanitise the expected name for filesystem safety.
+    4. Compare with the current folder name.
+    5. If different, rename the folder and update the database.
+
+    Skips folders where title or year is missing/empty. Logs every
+    rename action.
+
+    Args:
+        dry_run: If True, simulate rename operations without actually
+            moving folders or updating the database.
+
+    Returns:
+        Dictionary with counts:
+        - ``"scanned"``: total folders scanned
+        - ``"renamed"``: folders renamed
+        - ``"skipped"``: folders skipped (missing title/year)
+        - ``"errors"``: folders that caused an error
+    """
+    if not settings.anime_directory:
+        logger.warning("Folder rename skipped — anime directory not configured")
+        return RenameStats().to_dict()
+
+    anime_dir = Path(settings.anime_directory)
+    if not anime_dir.is_dir():
+        logger.warning("Folder rename skipped — anime directory not found: %s", anime_dir)
+        return RenameStats().to_dict()
+
+    if dry_run:
+        logger.info("Running in DRY-RUN mode — no changes will be made")
+
+    stats = RenameStats()
+    pre_existing_duplicates: set[str] = set()
+    duplicates = _scan_for_pre_existing_duplicates(anime_dir)
+
+    for dup_group in duplicates:
+        if _try_merge_duplicate_group(dup_group, dry_run=dry_run):
+            logger.info(
+                "Auto-merged duplicate group for '%s' (%d folders)",
+                dup_group.key,
+                dup_group.count,
+            )
+        else:
+            for folder in dup_group.folders:
+                pre_existing_duplicates.add(folder)
+            logger.warning(
+                "Duplicate folders detected for series '%s': %s — "
+                "manual cleanup required (different releases or non-empty duplicates)",
+                dup_group.key,
+                dup_group.folders,
+            )
+
+    for series_dir in sorted(anime_dir.iterdir()):
+        if not series_dir.is_dir():
+            continue
+
+        nfo_path = series_dir / "tvshow.nfo"
+        if not nfo_path.exists():
+            continue
+
+        stats.scanned += 1
+
+        title, year = _parse_nfo_title_and_year(nfo_path)
+        if not title or not year:
+            logger.info(
+                "Skipping rename for '%s' — missing title or year in NFO",
+                series_dir.name,
+            )
+            stats.skipped += 1
+            continue
+
+        expected_name = _compute_expected_folder_name(title, year)
+        current_name = series_dir.name
+
+        if expected_name == current_name:
+            logger.debug("Folder name already correct: '%s'", current_name)
+            continue
+
+        if _is_series_being_downloaded(current_name):
+            logger.info(
+                "Skipping rename for '%s' — series has active or pending downloads",
+                current_name,
+            )
+            stats.skipped += 1
+            continue
+
+        expected_path = anime_dir / expected_name
+
+        if current_name in pre_existing_duplicates:
+            logger.warning(
+                "Skipping rename for '%s' — pre-existing duplicate folder detected",
+                current_name,
+            )
+            stats.errors += 1
+            continue
+
+        if expected_path.exists():
+            if _remove_duplicate_target_folder(series_dir, current_name, expected_name, expected_path):
+                stats.renamed += 1
+            else:
+                stats.errors += 1
+            continue
+
+        if len(str(expected_path)) > 4096:
+            logger.warning(
+                "Cannot rename '%s' → '%s' — path exceeds OS limit",
+                current_name,
+                expected_name,
+            )
+            stats.errors += 1
+            continue
+
+        if dry_run:
+            logger.info("[DRY-RUN] Would rename folder: '%s' → '%s'", current_name, expected_name)
+            stats.renamed += 1
+            continue
+
+        try:
+            old_path = series_dir
+            series_dir.rename(expected_path)
+            logger.info("Renamed folder: '%s' → '%s'", current_name, expected_name)
+            stats.renamed += 1
+
+            await _update_database_paths(current_name, expected_name, anime_dir)
+            _remove_key_file(expected_path)
+            _cleanup_orphaned_folder(old_path, expected_path, dry_run=False)
+
+        except PermissionError as exc:
+            logger.error(
+                "Permission denied renaming '%s' → '%s': %s",
+                current_name,
+                expected_name,
+                exc,
+            )
+            stats.errors += 1
+        except OSError as exc:
+            logger.error(
+                "OS error renaming '%s' → '%s': %s",
+                current_name,
+                expected_name,
+                exc,
+            )
+            stats.errors += 1
+
+    logger.info(
+        "Folder rename scan complete: scanned=%d, renamed=%d, skipped=%d, errors=%d",
+        stats.scanned,
+        stats.renamed,
+        stats.skipped,
+        stats.errors,
+    )
+    return stats.to_dict()

src/server/services/scheduler/folder_scan_service.py

@@ -0,0 +1,428 @@
+"""Folder scan service for daily maintenance tasks.
+
+Encapsulates the daily folder-scan logic (orphaned-file detection,
+metadata refresh, and missing-episode queuing) so that the scheduler
+remains clean and the scan can be tested independently.
+"""
+from __future__ import annotations
+
+import asyncio
+from pathlib import Path
+from typing import Optional
+
+import structlog
+from lxml import etree
+
+from src.config.settings import settings as _settings
+from src.core.utils.image_downloader import ImageDownloader
+
+logger = structlog.get_logger(__name__)
+
+# Module-level semaphore to limit concurrent TMDB operations to 3.
+_TMDB_SEMAPHORE: asyncio.Semaphore = asyncio.Semaphore(3)
+
+# Semaphore to limit concurrent poster image downloads to 3.
+_POSTER_DOWNLOAD_SEMAPHORE: asyncio.Semaphore = asyncio.Semaphore(3)
+
+# Semaphore to limit concurrent NFO repair TMDB operations to 3.
+_NFO_REPAIR_SEMAPHORE: asyncio.Semaphore = asyncio.Semaphore(3)
+
+
+async def _create_missing_nfo(series_dir: Path, series_name: str) -> None:
+    """Create minimal NFO for series without one.
+
+    Creates a fresh :class:`NFOService` per invocation so concurrent
+    tasks cannot interfere with each other.
+
+    A module-level semaphore limits concurrent TMDB operations to 3.
+
+    Args:
+        series_dir: Absolute path to the series folder.
+        series_name: Human-readable series name for log messages.
+    """
+    from src.core.services.nfo_factory import NFOServiceFactory
+
+    async with _NFO_REPAIR_SEMAPHORE:
+        try:
+            factory = NFOServiceFactory()
+            nfo_service = factory.create()
+            await nfo_service.create_minimal_nfo(
+                serie_name=series_name,
+                serie_folder=series_dir.name,
+            )
+        except Exception as exc:  # pylint: disable=broad-except
+            logger.error(
+                "NFO creation failed for %s: %s",
+                series_name,
+                exc,
+            )
+
+
+async def _repair_one_series(series_dir: Path, series_name: str) -> None:
+    """Repair a single series NFO in isolation.
+
+    Creates a fresh :class:`NFOService` and :class:`NfoRepairService` per
+    invocation so that each repair owns its own ``aiohttp`` session/connector
+    and concurrent tasks cannot interfere with each other.
+
+    A module-level semaphore (``_NFO_REPAIR_SEMAPHORE``) limits the number of
+    simultaneous TMDB requests to avoid rate-limiting.
+
+    Any exception is caught and logged so the asyncio task never silently
+    drops an unhandled error.
+
+    Args:
+        series_dir: Absolute path to the series folder.
+        series_name: Human-readable series name for log messages.
+    """
+    from src.core.services.nfo_factory import NFOServiceFactory
+    from src.core.services.nfo_repair_service import NfoRepairService
+
+    async with _NFO_REPAIR_SEMAPHORE:
+        try:
+            factory = NFOServiceFactory()
+            nfo_service = factory.create()
+            repair_service = NfoRepairService(nfo_service)
+            await repair_service.repair_series(series_dir, series_name)
+        except Exception as exc:  # pylint: disable=broad-except
+            logger.error(
+                "NFO repair failed for %s: %s",
+                series_name,
+                exc,
+            )
+
+
+async def perform_nfo_repair_scan(background_loader=None) -> None:
+    """Scan all series folders, repair incomplete and create missing NFO files.
+
+    Called from ``FolderScanService.run_folder_scan()`` during the scheduled
+    daily folder scan (not on every startup).  Checks each subfolder of
+    ``settings.anime_directory`` for a ``tvshow.nfo``:
+    - Missing NFOs: creates minimal NFO via ``_create_missing_nfo``
+    - Incomplete NFOs: repairs via ``_repair_one_series``
+
+    Each repair task creates its own isolated :class:`NFOService` /
+    :class:`TMDBClient` so concurrent tasks never share an ``aiohttp``
+    session — this prevents "Connector is closed" errors when many repairs
+    run in parallel.  A semaphore caps TMDB concurrency at 3 to stay within
+    rate limits.
+
+    The ``background_loader`` parameter is accepted for backwards-compatibility
+    but is no longer used.
+
+    Args:
+        background_loader: Unused.  Kept to avoid breaking call-sites.
+    """
+    from src.core.services.nfo_repair_service import nfo_needs_repair
+
+    if not _settings.tmdb_api_key:
+        logger.warning("NFO repair scan skipped — TMDB API key not configured")
+        return
+    if not _settings.anime_directory:
+        logger.warning("NFO repair scan skipped — anime directory not configured")
+        return
+    anime_dir = Path(_settings.anime_directory)
+    if not anime_dir.is_dir():
+        logger.warning("NFO repair scan skipped — anime directory not found: %s", anime_dir)
+        return
+
+    queued = 0
+    total = 0
+    missing_nfo_count = 0
+    repair_tasks: list[asyncio.Task] = []
+    for series_dir in sorted(anime_dir.iterdir()):
+        if not series_dir.is_dir():
+            continue
+        nfo_path = series_dir / "tvshow.nfo"
+        series_name = series_dir.name
+        if not nfo_path.exists():
+            # Create minimal NFO for series without one
+            missing_nfo_count += 1
+            repair_tasks.append(
+                asyncio.create_task(
+                    _create_missing_nfo(series_dir, series_name),
+                    name=f"nfo_create:{series_name}",
+                )
+            )
+            continue
+        total += 1
+        if nfo_needs_repair(nfo_path):
+            queued += 1
+            repair_tasks.append(
+                asyncio.create_task(
+                    _repair_one_series(series_dir, series_name),
+                    name=f"nfo_repair:{series_name}",
+                )
+            )
+
+    if repair_tasks:
+        logger.info(
+            "NFO repair scan: waiting for %d repair/create tasks to complete",
+            len(repair_tasks),
+        )
+        await asyncio.gather(*repair_tasks, return_exceptions=True)
+        logger.info("NFO repair scan tasks completed")
+
+    logger.info(
+        "NFO repair scan complete: %d of %d series queued for repair, %d missing NFOs queued for creation",
+        queued,
+        total,
+        missing_nfo_count,
+    )
+
+
+class FolderScanServiceError(Exception):
+    """Service-level exception for folder-scan operations."""
+
+
+class FolderScanService:
+    """Performs daily maintenance scans over the anime library folder.
+
+    The service is intentionally stateless; a new instance can be created
+    for every scheduled invocation or test case.
+    """
+
+    async def run_folder_scan(self) -> None:
+        """Execute the daily folder scan.
+
+        Checks prerequisites, logs progress, and delegates to sub-task
+        helpers.  Any unhandled exception is caught and logged so the
+        scheduler task never crashes.
+        """
+        logger.info("Folder scan started")
+
+        try:
+            if not self._prerequisites_met():
+                return
+
+            # 1.3 — Repair incomplete NFO files (synchronous, waits for completion).
+            logger.info("Starting NFO repair scan as part of folder scan")
+            await perform_nfo_repair_scan(background_loader=None)
+            logger.info("NFO repair scan complete")
+
+            # 1.4 — Validate and rename series folders after NFO repair.
+            logger.info("Starting folder rename validation")
+            from src.server.services.scheduler.folder_rename_service import (
+                validate_and_rename_series_folders,
+            )
+
+            rename_stats = await validate_and_rename_series_folders()
+            logger.info(
+                "Folder rename validation complete",
+                scanned=rename_stats["scanned"],
+                renamed=rename_stats["renamed"],
+                skipped=rename_stats["skipped"],
+                errors=rename_stats["errors"],
+            )
+
+            # 1.5 — Check and download missing poster.jpg files.
+            logger.info("Starting poster check")
+            poster_stats = await self.check_and_download_missing_posters()
+            logger.info(
+                "Poster check complete",
+                scanned=poster_stats["scanned"],
+                downloaded=poster_stats["downloaded"],
+                skipped=poster_stats["skipped"],
+                errors=poster_stats["errors"],
+            )
+
+            logger.info("Folder scan completed")
+        except Exception as exc:  # pylint: disable=broad-exception-caught
+            logger.error("Folder scan failed", error=str(exc), exc_info=True)
+
+    # ------------------------------------------------------------------
+    # Poster check helpers
+    # ------------------------------------------------------------------
+
+    async def check_and_download_missing_posters(self) -> dict[str, int]:
+        """Iterate over series folders and download missing poster.jpg files.
+
+        For each folder containing a ``tvshow.nfo``:
+        1. Check if ``poster.jpg`` exists and is at least
+           :attr:`ImageDownloader.min_file_size` bytes.
+        2. If missing or too small, parse ``tvshow.nfo`` for a ``<thumb>``
+           URL (preferring ``aspect="poster"``).
+        3. Download the image via :class:`ImageDownloader` under a
+           semaphore that limits concurrency to 3.
+
+        Returns:
+            Dictionary with counts:
+            - ``"scanned"``: total folders scanned
+            - ``"downloaded"``: posters successfully downloaded
+            - ``"skipped"``: folders skipped (no NFO, no thumb URL,
+              or poster already valid)
+            - ``"errors"``: folders that caused a download error
+        """
+        from src.config.settings import settings  # noqa: PLC0415
+
+        stats = {"scanned": 0, "downloaded": 0, "skipped": 0, "errors": 0}
+
+        if not settings.anime_directory:
+            logger.warning("Poster check skipped — anime directory not configured")
+            return stats
+
+        anime_dir = Path(settings.anime_directory)
+        if not anime_dir.is_dir():
+            logger.warning(
+                "Poster check skipped — anime directory not found: %s", anime_dir
+            )
+            return stats
+
+        # Gather all series directories that contain a tvshow.nfo
+        series_dirs = [
+            d for d in anime_dir.iterdir()
+            if d.is_dir() and (d / "tvshow.nfo").exists()
+        ]
+
+        if not series_dirs:
+            logger.debug("No series folders found for poster check")
+            return stats
+
+        # Process each series folder concurrently with semaphore
+        tasks = [
+            self._check_and_download_poster(series_dir, stats)
+            for series_dir in series_dirs
+        ]
+        await asyncio.gather(*tasks, return_exceptions=True)
+
+        return stats
+
+    async def _check_and_download_poster(
+        self, series_dir: Path, stats: dict[str, int]
+    ) -> None:
+        """Check and download poster for a single series folder.
+
+        Args:
+            series_dir: Path to the series folder.
+            stats: Mutable stats dictionary to update.
+        """
+        stats["scanned"] += 1
+        poster_path = series_dir / "poster.jpg"
+
+        # Check if poster already exists and is large enough
+        if poster_path.exists():
+            try:
+                # Default min_file_size from ImageDownloader is 1024 bytes (1 KB)
+                if poster_path.stat().st_size >= 1024:
+                    logger.debug(
+                        "Poster already valid for '%s'", series_dir.name
+                    )
+                    stats["skipped"] += 1
+                    return
+            except OSError:
+                pass  # Fall through to re-download
+
+        # Parse NFO for thumb URL
+        nfo_path = series_dir / "tvshow.nfo"
+        poster_url = self._extract_poster_url_from_nfo(nfo_path)
+
+        if not poster_url:
+            logger.info(
+                "No poster URL found in NFO for '%s', skipping",
+                series_dir.name,
+            )
+            stats["skipped"] += 1
+            return
+
+        # Respect the nfo_download_poster setting
+        from src.config.settings import settings as app_settings  # noqa: PLC0415
+
+        if not app_settings.nfo_download_poster:
+            logger.debug(
+                "Poster download disabled by nfo_download_poster setting for '%s'",
+                series_dir.name,
+            )
+            stats["skipped"] += 1
+            return
+
+        # Download poster with semaphore
+        async with _POSTER_DOWNLOAD_SEMAPHORE:
+            try:
+                async with ImageDownloader() as downloader:
+                    success = await downloader.download_poster(
+                        poster_url, series_dir, skip_existing=False
+                    )
+                if success:
+                    logger.info(
+                        "Downloaded poster for '%s'", series_dir.name
+                    )
+                    stats["downloaded"] += 1
+                else:
+                    logger.warning(
+                        "Failed to download poster for '%s'", series_dir.name
+                    )
+                    stats["errors"] += 1
+            except Exception as exc:  # pylint: disable=broad-except
+                logger.error(
+                    "Error downloading poster for '%s': %s",
+                    series_dir.name,
+                    exc,
+                )
+                stats["errors"] += 1
+
+    @staticmethod
+    def _extract_poster_url_from_nfo(nfo_path: Path) -> Optional[str]:
+        """Parse tvshow.nfo and extract the poster thumb URL.
+
+        Prefers ``<thumb aspect="poster">``; falls back to the first
+        ``<thumb>`` element if no aspect attribute is present.
+
+        Args:
+            nfo_path: Absolute path to the ``tvshow.nfo`` file.
+
+        Returns:
+            The poster URL string, or ``None`` if not found.
+        """
+        if not nfo_path.exists():
+            return None
+
+        try:
+            tree = etree.parse(str(nfo_path))
+            root = tree.getroot()
+
+            # Prefer thumb with aspect="poster"
+            for thumb in root.findall(".//thumb"):
+                if thumb.get("aspect") == "poster" and thumb.text:
+                    return thumb.text.strip()
+
+            # Fallback to first thumb with text
+            for thumb in root.findall(".//thumb"):
+                if thumb.text:
+                    return thumb.text.strip()
+
+            return None
+        except etree.XMLSyntaxError:
+            logger.warning("Malformed XML in %s", nfo_path)
+            return None
+        except Exception:  # pylint: disable=broad-except
+            return None
+
+    # ------------------------------------------------------------------
+    # Private helpers
+    # ------------------------------------------------------------------
+
+    def _prerequisites_met(self) -> bool:
+        """Verify that the environment is ready for a folder scan.
+
+        Returns:
+            True when ``settings.anime_directory`` exists and
+            ``settings.tmdb_api_key`` is configured.
+        """
+        from src.config.settings import settings  # noqa: PLC0415
+
+        if not settings.tmdb_api_key:
+            logger.warning("Folder scan skipped — TMDB API key not configured")
+            return False
+
+        if not settings.anime_directory:
+            logger.warning("Folder scan skipped — anime directory not configured")
+            return False
+
+        anime_dir = Path(settings.anime_directory)
+        if not anime_dir.is_dir():
+            logger.warning(
+                "Folder scan skipped — anime directory not found: %s", anime_dir
+            )
+            return False
+
+        return True

src/server/services/scheduler/key_resolution_service.py

@@ -0,0 +1,317 @@
+"""Key resolution service for orphaned anime folders.
+
+Attempts to resolve provider keys for anime folders that have no key/data
+file and no database entry, by searching the anime provider and matching
+folder names to search results.
+
+This service runs after nfo_repair_service during the daily folder scan.
+"""
+from __future__ import annotations
+
+import asyncio
+import re
+from pathlib import Path
+from typing import Optional
+
+import structlog
+
+from src.config.settings import settings as _settings
+
+logger = structlog.get_logger(__name__)
+
+# Limit concurrent provider searches to avoid rate-limiting.
+_SEARCH_SEMAPHORE: asyncio.Semaphore = asyncio.Semaphore(2)
+
+
+def _strip_year_from_folder(folder_name: str) -> str:
+    """Remove trailing year suffix like ' (2020)' from folder name.
+
+    Args:
+        folder_name: Folder name, e.g. 'Rent-A-Girlfriend (2020)'
+
+    Returns:
+        Name without year, e.g. 'Rent-A-Girlfriend'
+    """
+    return re.sub(r"\s*\(\d{4}\)\s*$", "", folder_name).strip()
+
+
+def _extract_year_from_folder(folder_name: str) -> Optional[int]:
+    """Extract year from folder name like 'Anime Name (2020)'.
+
+    Returns:
+        Year as int or None if not present.
+    """
+    match = re.search(r"\((\d{4})\)$", folder_name.strip())
+    if match:
+        return int(match.group(1))
+    return None
+
+
+def _extract_key_from_link(link: str) -> Optional[str]:
+    """Extract provider key from search result link.
+
+    Args:
+        link: Link like '/anime/stream/rent-a-girlfriend' or full URL.
+
+    Returns:
+        Key slug like 'rent-a-girlfriend' or None.
+    """
+    if not link:
+        return None
+    if "/anime/stream/" in link:
+        parts = link.split("/anime/stream/")[-1].split("/")
+        key = parts[0].strip()
+        return key if key else None
+    # If link is just a slug
+    if "/" not in link and link.strip():
+        return link.strip()
+    return None
+
+
+def _normalize_for_comparison(text: str) -> str:
+    """Normalize text for case-insensitive comparison.
+
+    Strips whitespace, lowercases, and removes common punctuation
+    differences that shouldn't affect matching.
+
+    Args:
+        text: Raw text string.
+
+    Returns:
+        Normalized lowercase string.
+    """
+    normalized = text.strip().lower()
+    # Remove common punctuation that varies between sources
+    normalized = re.sub(r"[:\-–—]", " ", normalized)
+    # Collapse multiple spaces
+    normalized = re.sub(r"\s+", " ", normalized)
+    return normalized.strip()
+
+
+async def resolve_key_for_folder(folder_name: str) -> Optional[str]:
+    """Attempt to resolve the provider key for a single folder.
+
+    Strategy:
+    1. Strip year suffix from folder name to get search query.
+    2. Search the anime provider with that query.
+    3. If exactly ONE result matches the folder name (case-insensitive),
+       return the key extracted from the result link.
+    4. If zero or multiple matches, return None (not confident enough).
+
+    Args:
+        folder_name: The anime folder name, e.g. 'Rent-A-Girlfriend (2020)'.
+
+    Returns:
+        The provider key string, or None if resolution is not confident.
+    """
+    search_query = _strip_year_from_folder(folder_name)
+    if not search_query:
+        logger.debug("Empty search query after stripping year from '%s'", folder_name)
+        return None
+
+    async with _SEARCH_SEMAPHORE:
+        try:
+            loop = asyncio.get_running_loop()
+            results = await loop.run_in_executor(None, _search_provider, search_query)
+        except Exception as exc:
+            logger.warning(
+                "Provider search failed for '%s': %s", search_query, exc
+            )
+            return None
+
+    if not results:
+        logger.debug("No search results for folder '%s'", folder_name)
+        return None
+
+    # Filter results: find exact name matches (case-insensitive)
+    normalized_query = _normalize_for_comparison(search_query)
+    exact_matches = []
+
+    for result in results:
+        title = result.get("title") or result.get("name") or ""
+        normalized_title = _normalize_for_comparison(title)
+
+        if normalized_title == normalized_query:
+            key = _extract_key_from_link(result.get("link", ""))
+            if key:
+                exact_matches.append((key, title))
+
+    if len(exact_matches) == 1:
+        resolved_key, matched_title = exact_matches[0]
+        logger.info(
+            "Resolved key for folder '%s': key='%s' (matched title: '%s')",
+            folder_name,
+            resolved_key,
+            matched_title,
+        )
+        return resolved_key
+
+    if len(exact_matches) > 1:
+        logger.info(
+            "Multiple exact matches for folder '%s' (%d matches), skipping",
+            folder_name,
+            len(exact_matches),
+        )
+    else:
+        logger.debug(
+            "No exact title match for folder '%s' in %d results",
+            folder_name,
+            len(results),
+        )
+
+    return None
+
+
+def _search_provider(query: str) -> list:
+    """Call the anime provider search synchronously.
+
+    Args:
+        query: Search term.
+
+    Returns:
+        List of search result dicts with 'link' and 'title'/'name' fields.
+    """
+    from src.core.providers.provider_factory import Loaders
+
+    loader = Loaders().GetLoader("aniworld.to")
+    return loader.search(query)
+
+
+async def perform_key_resolution_scan() -> dict[str, int]:
+    """Scan all anime folders and resolve missing keys.
+
+    Iterates over all subfolders of the anime directory. For each folder
+    that has no corresponding database entry, attempts to resolve the
+    provider key via provider search and saves it to the database.
+
+    Returns:
+        Dictionary with counts:
+        - 'scanned': total folders checked
+        - 'resolved': keys successfully resolved and saved
+        - 'skipped': folders already in DB or resolution uncertain
+        - 'errors': folders that caused errors during resolution
+    """
+    from src.server.database.connection import get_db_session
+    from src.server.database.service import AnimeSeriesService
+
+    stats = {"scanned": 0, "resolved": 0, "skipped": 0, "errors": 0}
+
+    if not _settings.anime_directory:
+        logger.warning("Key resolution scan skipped — anime directory not configured")
+        return stats
+
+    anime_dir = Path(_settings.anime_directory)
+    if not anime_dir.is_dir():
+        logger.warning(
+            "Key resolution scan skipped — anime directory not found: %s",
+            anime_dir,
+        )
+        return stats
+
+    # Collect folders that need resolution
+    folders_to_resolve: list[str] = []
+
+    async with get_db_session() as db:
+        for series_dir in sorted(anime_dir.iterdir()):
+            if not series_dir.is_dir():
+                continue
+            folder_name = series_dir.name
+            stats["scanned"] += 1
+
+            # Check if already in database
+            existing = await AnimeSeriesService.get_by_folder(db, folder_name)
+            if existing:
+                stats["skipped"] += 1
+                continue
+
+            folders_to_resolve.append(folder_name)
+
+    if not folders_to_resolve:
+        logger.info("Key resolution scan: all folders already have DB entries")
+        return stats
+
+    logger.info(
+        "Key resolution scan: %d folders need resolution", len(folders_to_resolve)
+    )
+
+    # Resolve keys one by one (provider search is rate-limited)
+    for folder_name in folders_to_resolve:
+        try:
+            key = await resolve_key_for_folder(folder_name)
+            if key:
+                # Save to database
+                await _save_resolved_key(folder_name, key)
+                stats["resolved"] += 1
+            else:
+                stats["skipped"] += 1
+        except Exception as exc:
+            logger.error(
+                "Error resolving key for folder '%s': %s",
+                folder_name,
+                exc,
+            )
+            stats["errors"] += 1
+
+    logger.info(
+        "Key resolution scan complete: scanned=%d, resolved=%d, skipped=%d, errors=%d",
+        stats["scanned"],
+        stats["resolved"],
+        stats["skipped"],
+        stats["errors"],
+    )
+    return stats
+
+
+async def _save_resolved_key(folder_name: str, key: str) -> None:
+    """Save a resolved key to the database.
+
+    Creates a new AnimeSeries entry with the resolved key and folder name.
+    Does NOT write any key/data file to disk.
+
+    Args:
+        folder_name: The anime folder name (e.g. 'Rent-A-Girlfriend (2020)').
+        key: The resolved provider key (e.g. 'rent-a-girlfriend').
+    """
+    from src.server.database.connection import get_db_session
+    from src.server.database.service import AnimeSeriesService
+
+    name = _strip_year_from_folder(folder_name)
+    year = _extract_year_from_folder(folder_name)
+
+    async with get_db_session() as db:
+        # Double-check: another task might have resolved it concurrently
+        existing = await AnimeSeriesService.get_by_folder(db, folder_name)
+        if existing:
+            logger.debug(
+                "Folder '%s' already in DB (resolved concurrently), skipping",
+                folder_name,
+            )
+            return
+
+        # Also check if a series with this key already exists
+        existing_key = await AnimeSeriesService.get_by_key(db, key)
+        if existing_key:
+            logger.warning(
+                "Key '%s' already exists in DB for folder '%s', "
+                "cannot assign to folder '%s'",
+                key,
+                existing_key.folder,
+                folder_name,
+            )
+            return
+
+        await AnimeSeriesService.create(
+            db,
+            key=key,
+            name=name,
+            site="aniworld.to",
+            folder=folder_name,
+            year=year,
+            loading_status="pending",
+            episodes_loaded=False,
+        )
+        logger.info(
+            "Saved resolved key '%s' for folder '%s' to database",
+            key,
+            folder_name,
+        )

src/server/services/scheduler/rescan_orchestrator.py

@@ -0,0 +1,293 @@
+"""Rescan orchestrator — coordinates all scan/cleanup operations during a rescan.
+
+Extracts the rescan workflow from SchedulerService so scheduling and scan
+logic are cleanly separated.
+
+Called by SchedulerService.trigger_rescan() and by _run_rescan_job().
+"""
+from __future__ import annotations
+
+import logging
+from datetime import datetime, timezone
+from typing import List, Optional
+
+from src.server.models.config import SchedulerConfig
+
+logger = logging.getLogger(__name__)
+
+
+class RescanOrchestrator:
+    """Coordinates rescan, auto-download, folder scan, and key resolution.
+
+    This class encapsulates the entire post-rescan workflow so SchedulerService
+    only needs to call a single method.
+    """
+
+    def __init__(self, config: Optional[SchedulerConfig] = None) -> None:
+        """Initialize the orchestrator.
+
+        Args:
+            config: Optional scheduler config. If None, operations that depend
+                on config flags (auto_download, folder_scan) will be skipped.
+        """
+        self._config = config
+        self._last_scan_time: Optional[datetime] = None
+        # Cooldown tracking for auto-download to prevent rapid re-triggers
+        self._last_auto_download_time: Optional[datetime] = None
+        self._auto_download_cooldown_seconds: int = 300  # 5 minutes default
+
+    @property
+    def last_scan_time(self) -> Optional[datetime]:
+        return self._last_scan_time
+
+    # ------------------------------------------------------------------
+    # Auto-download
+    # ------------------------------------------------------------------
+
+    async def run_auto_download(self) -> int:
+        """Queue and start downloads for all series with missing episodes.
+
+        Returns:
+            Number of episodes queued.
+        """
+        from datetime import timedelta
+
+        from src.server.models.download import EpisodeIdentifier
+        from src.server.utils.dependencies import (
+            get_anime_service,
+            get_download_service,
+        )
+
+        # Check cooldown to prevent rapid re-triggers
+        now = datetime.now(timezone.utc)
+        if self._last_auto_download_time is not None:
+            elapsed = now - self._last_auto_download_time
+            if elapsed < timedelta(seconds=self._auto_download_cooldown_seconds):
+                logger.debug(
+                    "Auto-download skipped: cooldown active (elapsed=%.1fs cooldown=%ds)",
+                    elapsed.total_seconds(),
+                    self._auto_download_cooldown_seconds,
+                )
+                return 0
+
+        anime_service = get_anime_service()
+        download_service = get_download_service()
+
+        series_list = anime_service._cached_list_missing()
+        queued_count = 0
+
+        for series in series_list:
+            episode_dict: dict = series.get("episodeDict") or {}
+            if not episode_dict:
+                continue
+
+            episodes: List[EpisodeIdentifier] = []
+            for season_str, ep_numbers in episode_dict.items():
+                for ep_num in ep_numbers:
+                    episodes.append(
+                        EpisodeIdentifier(season=int(season_str), episode=int(ep_num))
+                    )
+
+            if not episodes:
+                continue
+
+            await download_service.add_to_queue(
+                serie_id=series.get("key", ""),
+                serie_folder=series.get("folder", series.get("name", "")),
+                serie_name=series.get("name", ""),
+                episodes=episodes,
+            )
+            queued_count += len(episodes)
+            logger.info(
+                "Auto-download queued episodes for series=%s count=%d",
+                series.get("key"),
+                len(episodes),
+            )
+
+        if queued_count:
+            await download_service.start_queue_processing()
+            logger.info("Auto-download queue processing started: queued=%d", queued_count)
+
+        self._last_auto_download_time = datetime.now(timezone.utc)
+        logger.info("Auto-download completed: queued_count=%d", queued_count)
+        return queued_count
+
+    # ------------------------------------------------------------------
+    # Folder scan
+    # ------------------------------------------------------------------
+
+    async def run_folder_scan(self) -> None:
+        """Run the folder scan maintenance task."""
+        from src.server.services.scheduler.folder_scan_service import FolderScanService
+
+        folder_scan_service = FolderScanService()
+        await folder_scan_service.run_folder_scan()
+        logger.info("Folder scan completed successfully")
+
+    # ------------------------------------------------------------------
+    # Key resolution
+    # ------------------------------------------------------------------
+
+    async def run_key_resolution(self) -> dict:
+        """Run the orphaned folder key resolution scan.
+
+        Returns:
+            Dict with resolved/skipped/errors counts.
+        """
+        from src.server.services.scheduler.key_resolution_service import (
+            perform_key_resolution_scan,
+        )
+
+        key_stats = await perform_key_resolution_scan()
+        logger.info(
+            "Key resolution scan completed: resolved=%d, skipped=%d, errors=%d",
+            key_stats["resolved"],
+            key_stats["skipped"],
+            key_stats["errors"],
+        )
+        return key_stats
+
+    # ------------------------------------------------------------------
+    # Main orchestrator entry point
+    # ------------------------------------------------------------------
+
+    async def execute(self) -> dict:
+        """Execute the full rescan workflow.
+
+        Runs in order:
+        1. anime_service.rescan()
+        2. auto-download (if enabled)
+        3. folder scan (if enabled)
+        4. key resolution scan (always, if anime_directory configured)
+
+        Returns:
+            Dict with duration and counts for each step.
+        """
+        scan_start = datetime.now(timezone.utc)
+        results = {
+            "started_at": scan_start.isoformat(),
+            "duration_seconds": 0.0,
+            "rescan_completed": False,
+            "auto_download_queued": 0,
+            "folder_scan_completed": False,
+            "key_resolution": {"resolved": 0, "skipped": 0, "errors": 0},
+        }
+
+        await self._broadcast(
+            "scheduled_rescan_started",
+            {"timestamp": scan_start.isoformat()},
+        )
+
+        try:
+            # 1. Main library rescan
+            await self._run_rescan()
+            results["rescan_completed"] = True
+
+            # 2. Auto-download
+            if self._config and self._config.auto_download_after_rescan:
+                try:
+                    queued = await self.run_auto_download()
+                    results["auto_download_queued"] = queued
+                    await self._broadcast(
+                        "auto_download_started", {"queued_count": queued}
+                    )
+                except Exception as exc:
+                    logger.error("Auto-download failed: %s", exc, exc_info=True)
+                    await self._broadcast(
+                        "auto_download_error", {"error": str(exc)}
+                    )
+
+            # 3. Folder scan
+            if self._config and self._config.folder_scan_enabled:
+                try:
+                    await self.run_folder_scan()
+                    results["folder_scan_completed"] = True
+                except Exception as exc:
+                    logger.error("Folder scan failed: %s", exc, exc_info=True)
+                    await self._broadcast("folder_scan_error", {"error": str(exc)})
+
+            # 4. Key resolution scan (always runs if anime_directory configured)
+            try:
+                key_stats = await self.run_key_resolution()
+                results["key_resolution"] = key_stats
+            except Exception as exc:
+                logger.error("Key resolution scan failed: %s", exc, exc_info=True)
+
+            self._last_scan_time = datetime.now(timezone.utc)
+            results["duration_seconds"] = (
+                self._last_scan_time - scan_start
+            ).total_seconds()
+
+            await self._broadcast(
+                "scheduled_rescan_completed",
+                {
+                    "timestamp": self._last_scan_time.isoformat(),
+                    "duration_seconds": results["duration_seconds"],
+                },
+            )
+
+            logger.info(
+                "Scheduled library rescan completed: duration=%.2fs",
+                results["duration_seconds"],
+            )
+
+        except Exception as exc:
+            logger.error("Scheduled rescan failed: %s", exc, exc_info=True)
+            await self._broadcast(
+                "scheduled_rescan_error",
+                {"error": str(exc), "timestamp": datetime.now(timezone.utc).isoformat()},
+            )
+            raise
+
+        return results
+
+    # ------------------------------------------------------------------
+    # Private helpers
+    # ------------------------------------------------------------------
+
+    async def _run_rescan(self) -> None:
+        """Run the anime service rescan."""
+        from src.server.utils.dependencies import get_anime_service
+
+        anime_service = get_anime_service()
+        logger.info("Anime service obtained, calling anime_service.rescan()...")
+        await anime_service.rescan()
+        logger.info("anime_service.rescan() completed")
+
+    async def _broadcast(self, event_type: str, data: dict) -> None:
+        """Broadcast a WebSocket event to all connected clients."""
+        try:
+            from src.server.services.websocket_service import get_websocket_service
+
+            ws_service = get_websocket_service()
+            await ws_service.manager.broadcast({"type": event_type, "data": data})
+        except Exception as exc:
+            logger.warning(
+                "WebSocket broadcast failed: event=%s error=%s", event_type, exc
+            )
+
+
+# ---------------------------------------------------------------------------
+# Module-level orchestrator
+# ---------------------------------------------------------------------------
+
+_orchestrator: Optional[RescanOrchestrator] = None
+
+
+def get_rescan_orchestrator(
+    config: Optional[SchedulerConfig] = None,
+) -> RescanOrchestrator:
+    """Return a RescanOrchestrator singleton (or create with optional config)."""
+    global _orchestrator
+    if _orchestrator is None or config is not None:
+        _orchestrator = RescanOrchestrator(config=config)
+        logger.debug("Created new RescanOrchestrator singleton")
+    else:
+        logger.debug("Returning existing RescanOrchestrator singleton")
+    return _orchestrator
+
+
+def reset_rescan_orchestrator() -> None:
+    """Reset the orchestrator singleton (used in tests)."""
+    global _orchestrator
+    _orchestrator = None

src/server/services/scheduler/scheduler_service.py

@@ -1,25 +1,34 @@
 """Scheduler service for automatic library rescans.
 
 Uses APScheduler's AsyncIOScheduler with CronTrigger for precise
-cron-based scheduling.  The legacy interval-based loop has been removed
-in favour of the cron approach.
+cron-based scheduling.
+
+Jobs are held in memory (no separate scheduler database).  On startup,
+if the last scan timestamp indicates a missed run (server was down at the
+scheduled cron time), a rescan is triggered immediately.
+
+Actual rescan logic is delegated to RescanService.
 """
 from __future__ import annotations
 
-from datetime import datetime, timezone
-from typing import List, Optional
+import logging
+from datetime import datetime, timedelta, timezone
+from typing import Optional
 
-import structlog
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from apscheduler.triggers.cron import CronTrigger
 
 from src.server.models.config import SchedulerConfig
 from src.server.services.config_service import ConfigServiceError, get_config_service
 
-logger = structlog.get_logger(__name__)
+logger = logging.getLogger(__name__)
 
 _JOB_ID = "scheduled_rescan"
 
+# Grace period for missed jobs (1 hour — handles server downtime between
+# scheduled time and startup).
+_MISFIRE_GRACE_SECONDS = 3600
+
 
 class SchedulerServiceError(Exception):
     """Service-level exception for scheduler operations."""
@@ -34,7 +43,9 @@ class SchedulerService:
     - Cron-based scheduling (time of day + days of week)
     - Immediate manual trigger
     - Live config reloading without app restart
-    - Auto-queueing downloads of missing episodes after rescan
+
+    Actual rescan/folder-scan/auto-download work is delegated to
+    RescanService.
     """
 
     def __init__(self) -> None:
@@ -42,7 +53,6 @@ class SchedulerService:
         self._is_running: bool = False
         self._scheduler: Optional[AsyncIOScheduler] = None
         self._config: Optional[SchedulerConfig] = None
-        self._last_scan_time: Optional[datetime] = None
         self._scan_in_progress: bool = False
         logger.info("SchedulerService initialised")
 
@@ -57,15 +67,18 @@ class SchedulerService:
             SchedulerServiceError: If the scheduler is already running or
                 config cannot be loaded.
         """
+        logger.info("SchedulerService.start() called")
         if self._is_running:
+            logger.warning("Scheduler start called but already running")
             raise SchedulerServiceError("Scheduler is already running")
 
         try:
             config_service = get_config_service()
             config = config_service.load_config()
             self._config = config.scheduler
+            logger.info("Scheduler config loaded successfully")
         except ConfigServiceError as exc:
-            logger.error("Failed to load scheduler configuration", error=str(exc))
+            logger.error("Failed to load scheduler configuration: %s", exc)
             raise SchedulerServiceError(f"Failed to load config: {exc}") from exc
 
         self._scheduler = AsyncIOScheduler()
@@ -75,6 +88,15 @@ class SchedulerService:
             self._is_running = True
             return
 
+        logger.info(
+            "Scheduler config loaded: enabled=%s time=%s days=%s auto_download=%s folder_scan=%s",
+            self._config.enabled,
+            self._config.schedule_time,
+            self._config.schedule_days,
+            self._config.auto_download_after_rescan,
+            self._config.folder_scan_enabled,
+        )
+
         trigger = self._build_cron_trigger()
         if trigger is None:
             logger.warning(
@@ -82,23 +104,38 @@ class SchedulerService:
             )
         else:
             self._scheduler.add_job(
-                self._perform_rescan,
+                _run_rescan_job,
                 trigger=trigger,
                 id=_JOB_ID,
                 replace_existing=True,
-                misfire_grace_time=300,
+                misfire_grace_time=_MISFIRE_GRACE_SECONDS,
+                coalesce=True,
             )
             logger.info(
-                "Scheduler started with cron trigger",
-                schedule_time=self._config.schedule_time,
-                schedule_days=self._config.schedule_days,
+                "Scheduler started with cron trigger: time=%s days=%s",
+                self._config.schedule_time,
+                self._config.schedule_days,
             )
 
         self._scheduler.start()
         self._is_running = True
 
+        # Log next scheduled run for visibility.
+        job = self._scheduler.get_job(_JOB_ID)
+        if job:
+            next_run = job.next_run_time
+            logger.info(
+                "Scheduler next run: %s",
+                next_run.isoformat() if next_run else None,
+            )
+
+        # Startup misfire recovery: check if the last scan was missed while
+        # the server was down.
+        await self._check_missed_run()
+
     async def stop(self) -> None:
         """Stop the APScheduler gracefully."""
+        logger.info("SchedulerService.stop() called")
         if not self._is_running:
             logger.debug("Scheduler stop called but not running")
             return
@@ -106,8 +143,27 @@ class SchedulerService:
         if self._scheduler and self._scheduler.running:
             self._scheduler.shutdown(wait=False)
             logger.info("Scheduler stopped")
+        else:
+            logger.info("Scheduler stop: scheduler was not running")
 
         self._is_running = False
+        logger.info("SchedulerService stopped successfully")
+
+    async def ensure_started(self) -> None:
+        """Ensure the scheduler is running (idempotent).
+
+        If already running, returns immediately. Otherwise, starts the scheduler.
+        This method is safe to call multiple times and from multiple callers.
+
+        Raises:
+            SchedulerServiceError: If startup fails (except for already running).
+        """
+        if self._is_running:
+            logger.debug("Scheduler ensure_started called but already running")
+            return
+
+        logger.info("Scheduler ensure_started: starting scheduler")
+        await self.start()
 
     async def trigger_rescan(self) -> bool:
         """Manually trigger a library rescan.
@@ -140,11 +196,12 @@ class SchedulerService:
         """
         self._config = config
         logger.info(
-            "Scheduler config reloaded",
-            enabled=config.enabled,
-            schedule_time=config.schedule_time,
-            schedule_days=config.schedule_days,
-            auto_download=config.auto_download_after_rescan,
+            "Scheduler config reloaded: enabled=%s time=%s days=%s auto_download=%s folder_scan=%s",
+            config.enabled,
+            config.schedule_time,
+            config.schedule_days,
+            config.auto_download_after_rescan,
+            config.folder_scan_enabled,
         )
 
         if not self._scheduler or not self._scheduler.running:
@@ -165,22 +222,23 @@ class SchedulerService:
             if self._scheduler.get_job(_JOB_ID):
                 self._scheduler.reschedule_job(_JOB_ID, trigger=trigger)
                 logger.info(
-                    "Scheduler rescheduled with cron trigger",
-                    schedule_time=config.schedule_time,
-                    schedule_days=config.schedule_days,
+                    "Scheduler rescheduled with cron trigger: time=%s days=%s",
+                    config.schedule_time,
+                    config.schedule_days,
                 )
             else:
                 self._scheduler.add_job(
-                    self._perform_rescan,
+                    _run_rescan_job,
                     trigger=trigger,
                     id=_JOB_ID,
                     replace_existing=True,
-                    misfire_grace_time=300,
+                    misfire_grace_time=_MISFIRE_GRACE_SECONDS,
+                    coalesce=True,
                 )
                 logger.info(
-                    "Scheduler job added with cron trigger",
-                    schedule_time=config.schedule_time,
-                    schedule_days=config.schedule_days,
+                    "Scheduler job added with cron trigger: time=%s days=%s",
+                    config.schedule_time,
+                    config.schedule_days,
                 )
 
     def get_status(self) -> dict:
@@ -189,6 +247,10 @@ class SchedulerService:
         Returns:
             Dict containing scheduler state and config fields.
         """
+        from src.server.services.rescan_service import get_rescan_service
+
+        rescan_service = get_rescan_service()
+
         next_run: Optional[str] = None
         if self._scheduler and self._scheduler.running:
             job = self._scheduler.get_job(_JOB_ID)
@@ -204,7 +266,14 @@ class SchedulerService:
             "auto_download_after_rescan": (
                 self._config.auto_download_after_rescan if self._config else False
             ),
-            "last_run": self._last_scan_time.isoformat() if self._last_scan_time else None,
+            "folder_scan_enabled": (
+                self._config.folder_scan_enabled if self._config else False
+            ),
+            "last_run": (
+                rescan_service.last_scan_time.isoformat()
+                if rescan_service.last_scan_time
+                else None
+            ),
             "next_run": next_run,
             "scan_in_progress": self._scan_in_progress,
         }
@@ -231,136 +300,109 @@ class SchedulerService:
             day_of_week=day_of_week,
         )
         logger.debug(
-            "CronTrigger built",
-            hour=hour_str,
-            minute=minute_str,
-            day_of_week=day_of_week,
+            "CronTrigger built: hour=%s minute=%s day_of_week=%s",
+            hour_str,
+            minute_str,
+            day_of_week,
         )
         return trigger
 
-    async def _broadcast(self, event_type: str, data: dict) -> None:
-        """Broadcast a WebSocket event to all connected clients."""
+    async def _check_missed_run(self) -> None:
+        """Check if a scheduled rescan was missed while the server was down.
+
+        Compares system_settings.last_scan_timestamp against the expected
+        schedule.  If the last scan is overdue (more than 24h ago for a daily
+        schedule) but within the grace period, triggers an immediate rescan.
+        """
+        if not self._config or not self._config.enabled:
+            return
+        if not self._config.schedule_days:
+            return
+
         try:
-            from src.server.services.websocket_service import (  # noqa: PLC0415
-                get_websocket_service,
+            from src.server.database.connection import get_db_session
+            from src.server.database.system_settings_service import (
+                SystemSettingsService,
             )
 
-            ws_service = get_websocket_service()
-            await ws_service.manager.broadcast({"type": event_type, "data": data})
+            async with get_db_session() as db:
+                settings = await SystemSettingsService.get_or_create(db)
+                last_scan = settings.last_scan_timestamp
+
+            if last_scan is None:
+                # Never scanned before — trigger immediately
+                logger.info("No previous scan recorded — triggering immediate rescan")
+                await self._perform_rescan()
+                return
+
+            # Ensure timezone-aware comparison
+            if last_scan.tzinfo is None:
+                last_scan = last_scan.replace(tzinfo=timezone.utc)
+
+            now = datetime.now(timezone.utc)
+            elapsed = now - last_scan
+
+            # If last scan was more than 24h + grace period ago, don't trigger
+            # (avoids surprise rescans after long downtime).
+            max_overdue = timedelta(hours=24, seconds=_MISFIRE_GRACE_SECONDS)
+            if elapsed > max_overdue:
+                logger.info(
+                    "Last scan was %s ago (> %s) — skipping missed-run recovery",
+                    elapsed,
+                    max_overdue,
+                )
+                return
+
+            # Check if a run should have happened between last_scan and now.
+            if elapsed > timedelta(hours=23):
+                logger.info(
+                    "Missed scheduled rescan detected (last scan %s ago) — triggering now",
+                    elapsed,
+                )
+                await self._perform_rescan()
+
         except Exception as exc:  # pylint: disable=broad-exception-caught
-            logger.warning("WebSocket broadcast failed", event=event_type, error=str(exc))
-
-    async def _auto_download_missing(self) -> None:
-        """Queue and start downloads for all series with missing episodes."""
-        from src.server.models.download import EpisodeIdentifier  # noqa: PLC0415
-        from src.server.utils.dependencies import (  # noqa: PLC0415
-            get_anime_service,
-            get_download_service,
-        )
-
-        anime_service = get_anime_service()
-        download_service = get_download_service()
-
-        series_list = anime_service._cached_list_missing()
-        queued_count = 0
-
-        for series in series_list:
-            episode_dict: dict = series.get("episodeDict") or {}
-            if not episode_dict:
-                continue
-
-            episodes: List[EpisodeIdentifier] = []
-            for season_str, ep_numbers in episode_dict.items():
-                for ep_num in ep_numbers:
-                    episodes.append(
-                        EpisodeIdentifier(season=int(season_str), episode=int(ep_num))
-                    )
-
-            if not episodes:
-                continue
-
-            await download_service.add_to_queue(
-                serie_id=series.get("key", ""),
-                serie_folder=series.get("folder", series.get("name", "")),
-                serie_name=series.get("name", ""),
-                episodes=episodes,
-            )
-            queued_count += len(episodes)
-            logger.info(
-                "Auto-download queued episodes",
-                series=series.get("key"),
-                count=len(episodes),
-            )
-
-        if queued_count:
-            await download_service.start_queue_processing()
-            logger.info("Auto-download queue processing started", queued=queued_count)
-
-        await self._broadcast("auto_download_started", {"queued_count": queued_count})
-        logger.info("Auto-download completed", queued_count=queued_count)
+            logger.warning("Missed-run check failed (non-fatal): %s", exc)
 
     async def _perform_rescan(self) -> None:
-        """Execute a library rescan and optionally trigger auto-download."""
+        """Execute a library rescan via RescanService."""
+        from src.server.services.rescan_service import get_rescan_service
+
+        logger.info(
+            "Scheduler _perform_rescan entered: scan_in_progress=%s",
+            self._scan_in_progress,
+        )
         if self._scan_in_progress:
             logger.warning("Skipping rescan: previous scan still in progress")
             return
 
         self._scan_in_progress = True
-        scan_start = datetime.now(timezone.utc)
-
         try:
-            logger.info("Starting scheduled library rescan")
-
-            from src.server.utils.dependencies import get_anime_service  # noqa: PLC0415
-
-            anime_service = get_anime_service()
-
-            await self._broadcast(
-                "scheduled_rescan_started",
-                {"timestamp": scan_start.isoformat()},
-            )
-
-            await anime_service.rescan()
-
-            self._last_scan_time = datetime.now(timezone.utc)
-            duration = (self._last_scan_time - scan_start).total_seconds()
-
-            logger.info("Scheduled library rescan completed", duration_seconds=duration)
-
-            await self._broadcast(
-                "scheduled_rescan_completed",
-                {
-                    "timestamp": self._last_scan_time.isoformat(),
-                    "duration_seconds": duration,
-                },
-            )
-
-            # Auto-download after rescan
-            if self._config and self._config.auto_download_after_rescan:
-                logger.info("Auto-download after rescan is enabled — starting")
-                try:
-                    await self._auto_download_missing()
-                except Exception as dl_exc:  # pylint: disable=broad-exception-caught
-                    logger.error(
-                        "Auto-download after rescan failed",
-                        error=str(dl_exc),
-                        exc_info=True,
-                    )
-                    await self._broadcast(
-                        "auto_download_error", {"error": str(dl_exc)}
-                    )
-            else:
-                logger.debug("Auto-download after rescan is disabled — skipping")
-
-        except Exception as exc:  # pylint: disable=broad-exception-caught
-            logger.error("Scheduled rescan failed", error=str(exc), exc_info=True)
-            await self._broadcast(
-                "scheduled_rescan_error",
-                {"error": str(exc), "timestamp": datetime.now(timezone.utc).isoformat()},
-            )
-
+            rescan_service = get_rescan_service(config=self._config)
+            await rescan_service.execute()
         finally:
             self._scan_in_progress = False
+            logger.info("Scheduled rescan finished: scan_in_progress reset to False")
+
+
+# ---------------------------------------------------------------------------
+# Module-level job runner
+#
+# APScheduler cannot serialize bound methods (SchedulerService instance
+# contains a reference to the scheduler itself, creating a circular pickle
+# error).  Using a module-level function avoids this.
+# ---------------------------------------------------------------------------
+
+async def _run_rescan_job() -> None:
+    """Module-level job entry point — delegates to the current service."""
+    logger.info("=" * 60)
+    logger.info("APScheduler triggered _run_rescan_job")
+    logger.info("Getting scheduler service singleton...")
+    svc = get_scheduler_service()
+    logger.info("Scheduler service obtained, calling _perform_rescan()")
+    await svc._perform_rescan()
+    logger.info("_run_rescan_job completed")
+    logger.info("=" * 60)
 
 
 # ---------------------------------------------------------------------------
@@ -374,7 +416,10 @@ def get_scheduler_service() -> SchedulerService:
     """Return the singleton SchedulerService instance."""
     global _scheduler_service
     if _scheduler_service is None:
+        logger.info("Creating new SchedulerService singleton")
         _scheduler_service = SchedulerService()
+    else:
+        logger.debug("Returning existing SchedulerService singleton")
     return _scheduler_service
 
 

src/server/utils/dependencies.py

@@ -57,6 +57,44 @@ _rate_limit_lock = Lock()
 _RATE_LIMIT_WINDOW_SECONDS = 60.0
 
 
+def _make_db_lookup():
+    """Build a synchronous ``(folder) -> Serie | None`` callable for SerieScanner.
+
+    The returned function opens a short-lived sync DB session, queries for a
+    series whose ``folder`` column matches the given name, and converts the
+    ORM row to a ``Serie`` domain object.  Returns ``None`` when the DB is not
+    yet initialised or no matching row is found.
+    """
+    from src.core.entities.series import Serie
+
+    def _lookup(folder: str) -> Optional["Serie"]:
+        try:
+            from src.server.database.connection import get_sync_session
+            from src.server.database.service import AnimeSeriesService
+
+            db = get_sync_session()
+            try:
+                row = AnimeSeriesService.get_by_folder_sync(db, folder)
+            finally:
+                db.close()
+
+            if row is None:
+                return None
+            return Serie(
+                key=row.key,
+                name=row.name or "",
+                site=row.site,
+                folder=row.folder,
+                episodeDict={},
+                year=row.year,
+            )
+        except RuntimeError:
+            # DB not initialised yet (e.g. first boot before init_db())
+            return None
+
+    return _lookup
+
+
 def get_series_app() -> SeriesApp:
     """
     Dependency to get SeriesApp instance.
@@ -134,7 +172,7 @@ def get_series_app() -> SeriesApp:
                         ),
                     )
 
-            _series_app = SeriesApp(anime_dir)
+            _series_app = SeriesApp(anime_dir, db_lookup=_make_db_lookup())
         except Exception as e:
             raise HTTPException(
                 status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,