backup

Docker/test_vpn.py

@@ -18,11 +18,14 @@ Usage:
     sudo python3 test_vpn.py
 """
 
+import logging
 import subprocess
 import time
 import unittest
 import os
 
+logger = logging.getLogger(__name__)
+
 IMAGE_NAME = "vpn-wireguard-test"
 CONTAINER_NAME = "vpn-test-container"
 CONFIG_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "wg0.conf")
@@ -63,23 +66,26 @@ 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.")
 
         # ── 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 +102,7 @@ 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 +112,17 @@ 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...")
+        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:
@@ -143,8 +149,8 @@ class TestVPNImage(unittest.TestCase):
     def test_01_ip_differs_from_host(self):
         """Public IP inside VPN is different from host IP."""
         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(
@@ -178,7 +184,7 @@ 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__":

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):**
 

docs/CONFIGURATION.md

@@ -217,6 +217,7 @@ Source: [src/server/models/config.py](../src/server/models/config.py#L15-L24)
 - `auto_create` creates NFO files during the download process
 - `update_on_scan` refreshes metadata when scanning existing anime
 - 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/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/bla

@@ -0,0 +1,10 @@
+review frontend code and check for architektre issues
+
+write the tasks in Task.md
+for each task add the following informations
+
+where is that found
+goal. how it should be
+possibale traps and issues
+docs changes needed
+why this is needed

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

@@ -117,4 +117,3 @@ For each task completed:
 
 ---
 
-## TODO List:

docs/tasks.md

@@ -0,0 +1,174 @@
+# Tasks — NFO Plot Missing Bug
+
+These tasks fix the root causes of `<plot>` being empty in `tvshow.nfo` after adding a series via the web UI.
+The bug does **not** appear after a server restart because the repair scan uses a different, correctly isolated code path.
+
+---
+
+## Task 1 — Replace shared NFOService in BackgroundLoaderService with per-task instances
+
+- [x] Completed
+
+### Where
+`src/server/services/background_loader_service.py` — method `_load_nfo_and_images` (~line 555)
+
+```python
+nfo_path = await self.series_app.nfo_service.create_tvshow_nfo(
+    serie_name=task.name,
+    serie_folder=task.folder,
+    year=task.year,
+    ...
+)
+```
+
+### Goal
+Create a fresh, isolated `NFOService` (with its own `TMDBClient` and `aiohttp` session) for every background loading task, exactly the same way `_repair_one_series` in `initialization_service.py` already does it.
+Each task must own its client so that closing the session at the end of one task never kills an in-flight request inside another task.
+
+### How it should look
+```python
+from src.core.services.nfo_factory import NFOServiceFactory
+
+factory = NFOServiceFactory()
+nfo_service = factory.create()
+nfo_path = await nfo_service.create_tvshow_nfo(
+    serie_name=task.name,
+    serie_folder=task.folder,
+    year=task.year,
+    ...
+)
+```
+
+### Possible traps and issues
+- `NFOServiceFactory.create()` raises `ValueError` if no TMDB API key is available.  Wrap in try/except and fall back gracefully (same behaviour as now when `nfo_service` is `None`).
+- The factory reads the API key from `settings` first, then from `config.json`. Do not pass the key explicitly so the fallback chain stays intact.
+- Each new `NFOService` opens its own `aiohttp` connector. Make sure to call `await nfo_service.close()` in a `finally` block to avoid connector leaks.
+
+### Docs changes needed
+None — this is an internal implementation detail.
+
+### Why this is needed
+Up to 5 background workers share one `NFOService`/`TMDBClient` instance. The `async with self.tmdb_client:` context manager inside `create_tvshow_nfo` calls `close()` on `__aexit__`, setting `session = None`. When Worker B exits its context while Worker A is still inside `_enrich_details_with_fallback` trying the `en-US` fallback request, that request throws "Connector is closed". The exception is silently swallowed, both `en-US` and `ja-JP` fallbacks fail, `details["overview"]` stays empty, and `plot` is written as an empty element.
+
+---
+
+## Task 2 — Guard NFOService init in SeriesApp on factory fallback, not just env var
+
+- [x] Completed
+
+### Where
+`src/core/SeriesApp.py` — `__init__` method (~line 175)
+
+```python
+self.nfo_service: Optional[NFOService] = None
+if settings.tmdb_api_key:          # ← checks env var ONLY
+    factory = get_nfo_factory()
+    self.nfo_service = factory.create()
+```
+
+### Goal
+The guard condition should be equivalent to what `NFOServiceFactory.create()` itself checks: whether the key is available from *any* source (env var or `config.json`). Replace the guard with a try/create pattern so that `nfo_service` is initialised whenever the factory would succeed.
+
+### How it should look
+```python
+self.nfo_service: Optional[NFOService] = 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")
+except Exception as e:
+    logger.warning("Failed to initialize NFO service: %s", e)
+```
+
+### Possible traps and issues
+- This changes the condition from "env var set" to "factory can produce a service". The factory already has a safe fallback and raises `ValueError` when no key exists — so the `except ValueError` path is the normal "not configured" case, not an error.
+- `SeriesApp` is used in tests with `settings.tmdb_api_key = None`. Those tests must not be affected; the `except ValueError` branch keeps behaviour identical.
+- `series_app.nfo_service` is still `None` when not configured — downstream code that checks `if self.series_app.nfo_service:` remains correct.
+
+### Docs changes needed
+`docs/CONFIGURATION.md` — note that `TMDB_API_KEY` env var is not required if `nfo.tmdb_api_key` is set in `config.json`.
+
+### Why this is needed
+If the TMDB API key is configured only via `config.json` (not the `TMDB_API_KEY` env var), `settings.tmdb_api_key` is `None` and the guard prevents `nfo_service` from ever being created. The background loader then skips NFO creation completely (`nfo_service` is `None`). The repair scan at startup uses `NFOServiceFactory` directly (reads config.json) so it does create the NFO — which is exactly why restart works but add does not.
+
+---
+
+## Task 3 — Remove non-reentrant `async with self.tmdb_client:` from NFOService public methods
+
+- [x] Completed
+
+### Where
+`src/core/services/nfo_service.py` — `create_tvshow_nfo` (~line 151) and `update_tvshow_nfo` (~line 265)
+
+```python
+async with self.tmdb_client:
+    details = await self.tmdb_client.get_tv_show_details(...)
+    ...
+```
+
+### Goal
+The `TMDBClient.__aenter__` / `__aexit__` open and **close** the session, making any concurrent call to the same client instance fail. Because Task 1 creates a fresh instance per call, this context manager becomes redundant. Change both methods to use `_ensure_session()` at the start and `close()` in a `finally` block, or simply call `await self.tmdb_client._ensure_session()` once and close after all requests. This makes the lifetime explicit and prevents double-close if the caller already manages it.
+
+### How it should look
+```python
+async def create_tvshow_nfo(self, ...) -> Path:
+    try:
+        await self.tmdb_client._ensure_session()
+        search_results = await self.tmdb_client.search_tv_show(search_name)
+        ...
+    finally:
+        await self.tmdb_client.close()
+```
+
+### Possible traps and issues
+- `TMDBClient.close()` is idempotent (checks `session.closed` before closing), so calling it in `finally` is safe even if the try block never opened a session.
+- After Task 1 every `NFOService` is short-lived (one call), so `finally: close()` effectively replaces the context manager with no behaviour change.
+- Do not remove the `__aenter__`/`__aexit__` from `TMDBClient` itself — other callers (e.g. tests, CLI) may still use it as a context manager.
+- `update_tvshow_nfo` has the same pattern; fix both methods.
+
+### Docs changes needed
+None — internal implementation detail.
+
+### Why this is needed
+Even after Task 1 fixes the shared-instance problem, the `async with self.tmdb_client:` pattern is fragile by design: `__aexit__` calls `close()`, which would break any hypothetical future reuse. Removing the implicit close makes the session lifetime explicit and eliminates the root mechanism that caused the original bug.
+
+---
+
+## Task 4 — Add `en-US` search fallback so `search_overview` is never empty
+
+### Where
+`src/core/services/nfo_service.py` — `create_tvshow_nfo` (~line 178) and `_enrich_details_with_fallback` (~line 395)
+
+```python
+search_overview = tv_show.get("overview") or None  # always None for anime — de-DE search returns ""
+```
+
+### Goal
+When the German `search_tv_show` result has an empty `overview`, perform a second search in `en-US` to obtain a non-empty overview as the last-resort fallback text. Store this as `search_overview` so `_enrich_details_with_fallback` can use it even if all language-specific detail requests fail.
+
+### How it should look
+```python
+search_overview = tv_show.get("overview") or None
+if not search_overview:
+    try:
+        en_results = await self.tmdb_client.search_tv_show(search_name, language="en-US")
+        en_match = self._find_best_match(en_results.get("results", []), search_name, year)
+        search_overview = en_match.get("overview") or None
+    except Exception:
+        pass  # best-effort only
+```
+
+### Possible traps and issues
+- This adds one extra TMDB request per series when the German overview is empty. It is best-effort and must be wrapped in a broad `except` so it never blocks NFO creation.
+- The TMDB search endpoint rate-limit is generous; one extra request per add is negligible.
+- `_find_best_match` can raise `TMDBAPIError` if the result list is empty — catch both `TMDBAPIError` and `Exception`.
+- `update_tvshow_nfo` calls `_enrich_details_with_fallback` without `search_overview`. This is acceptable because the detail request with `en-US` fallback covers it; the search overview is only a last resort for the create path.
+
+### Docs changes needed
+None — transparent improvement.
+
+### Why this is needed
+Most anime have no German translation on TMDB. The `de-DE` search result returns `overview: ""`. The current code stores this as `search_overview = None` so the last-resort fallback in `_enrich_details_with_fallback` never fires. Combined with session contention (Task 1), the detail-level `en-US` fallback also fails, leaving `plot` empty. This task ensures that at least the search-level `en-US` overview is available as a safety net.

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/core/SeriesApp.py

@@ -171,23 +171,26 @@ 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

src/core/entities/SerieList.py

@@ -121,11 +121,11 @@ class SerieList:
     def load_series(self) -> None:
         """Populate the in-memory map with metadata discovered on disk."""
 
-        logging.info("Scanning anime folders in %s", self.directory)
+        logger.info("Scanning anime folders in %s", self.directory)
         try:
             entries: Iterable[str] = os.listdir(self.directory)
         except OSError as error:
-            logging.error(
+            logger.error(
                 "Unable to scan directory %s: %s",
                 self.directory,
                 error,
@@ -145,7 +145,7 @@ class SerieList:
         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)
+                logger.debug("Found data file for folder %s", anime_folder)
                 serie = self._load_data(anime_folder, anime_path)
                 
                 if serie:
@@ -159,7 +159,7 @@ class SerieList:
                         nfo_stats["with_nfo"] += 1
                     else:
                         nfo_stats["without_nfo"] += 1
-                        logging.debug(
+                        logger.debug(
                             "Series '%s' (key: %s) is missing tvshow.nfo",
                             serie.name,
                             serie.key
@@ -173,7 +173,7 @@ class SerieList:
                         media_stats["with_poster"] += 1
                     else:
                         media_stats["without_poster"] += 1
-                        logging.debug(
+                        logger.debug(
                             "Series '%s' (key: %s) is missing poster.jpg",
                             serie.name,
                             serie.key
@@ -184,7 +184,7 @@ class SerieList:
                         media_stats["with_logo"] += 1
                     else:
                         media_stats["without_logo"] += 1
-                        logging.debug(
+                        logger.debug(
                             "Series '%s' (key: %s) is missing logo.png",
                             serie.name,
                             serie.key
@@ -195,7 +195,7 @@ class SerieList:
                         media_stats["with_fanart"] += 1
                     else:
                         media_stats["without_fanart"] += 1
-                        logging.debug(
+                        logger.debug(
                             "Series '%s' (key: %s) is missing fanart.jpg",
                             serie.name,
                             serie.key
@@ -203,20 +203,20 @@ class SerieList:
                 
                 continue
 
-            logging.warning(
+            logger.warning(
                 "Skipping folder %s because no metadata file was found",
                 anime_folder,
             )
         
         # Log summary statistics
         if nfo_stats["total"] > 0:
-            logging.info(
+            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"]
             )
-            logging.info(
+            logger.info(
                 "Media scan complete: Poster (%d/%d), Logo (%d/%d), Fanart (%d/%d)",
                 media_stats["with_poster"],
                 nfo_stats["total"],
@@ -241,14 +241,14 @@ class SerieList:
             serie = Serie.load_from_file(data_path)
             # Store by key, not folder
             self.keyDict[serie.key] = serie
-            logging.debug(
+            logger.debug(
                 "Successfully loaded metadata for %s (key: %s)",
                 anime_folder,
                 serie.key
             )
             return serie
         except (OSError, JSONDecodeError, KeyError, ValueError) as error:
-            logging.error(
+            logger.error(
                 "Failed to load metadata for folder %s from %s: %s",
                 anime_folder,
                 data_path,

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:
         """

src/core/error_handler.py

@@ -55,7 +55,8 @@ class RecoveryStrategies:
                 if attempt == max_retries - 1:
                     raise
                 logger.warning(
-                    f"Network error on attempt {attempt + 1}, retrying..."
+                    "Network error on attempt %d, retrying...",
+                    attempt + 1,
                 )
                 continue
 
@@ -72,7 +73,8 @@ class RecoveryStrategies:
                 if attempt == max_retries - 1:
                     raise
                 logger.warning(
-                    f"Download error on attempt {attempt + 1}, retrying..."
+                    "Download error on attempt %d, retrying...",
+                    attempt + 1,
                 )
                 continue
 
@@ -92,7 +94,7 @@ 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 +125,18 @@ 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_service.py

@@ -134,48 +134,76 @@ 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:
+        try:
+            await self.tmdb_client._ensure_session()
+
             # Search for TV show with clean name (without year)
-            logger.debug(f"Searching TMDB for: {search_name}")
+            logger.debug("Searching TMDB for: %s", 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})")
-            
+
+            logger.info("Found match: %s (ID: %s)", tv_show['name'], tv_id)
+
             # Get detailed information with multi-language image support
             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
             )
-            
+
             # Convert TMDB data to TVShowNFO model
             nfo_model = tmdb_to_nfo_model(
                 details,
@@ -183,15 +211,15 @@ 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,
@@ -200,8 +228,10 @@ 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,
@@ -227,7 +257,7 @@ 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:
@@ -253,26 +283,26 @@ 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)            
+            details = await self._enrich_details_with_fallback(details)
             # Convert TMDB data to TVShowNFO model
             nfo_model = tmdb_to_nfo_model(
                 details,
@@ -280,14 +310,14 @@ 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(
@@ -297,8 +327,10 @@ 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.
@@ -318,7 +350,7 @@ 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:
@@ -375,9 +407,9 @@ 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
     
@@ -480,7 +512,7 @@ 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)
@@ -545,7 +577,7 @@ class NFOService:
             skip_existing=True
         )
         
-        logger.info(f"Media download results: {results}")
+        logger.info("Media download results: %s", results)
         return results
     
 

src/core/services/series_manager_service.py

@@ -136,7 +136,7 @@ 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"]:
@@ -203,14 +203,14 @@ class SeriesManagerService:
                     download_logo=self.download_logo,
                     download_fanart=self.download_fanart
                 )
-                logger.info(f"Successfully created NFO for '{serie_name}'")
+                logger.info("Successfully created NFO for '%s'", serie_name)
             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}")
+            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 +246,7 @@ 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

@@ -107,7 +107,7 @@ 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]
         
         delay = 1
@@ -121,7 +121,7 @@ class TMDBClient:
                 if self.session is None:
                     raise TMDBAPIError("Session is not available")
                 
-                logger.debug(f"TMDB API request: {endpoint} (attempt {attempt + 1})")
+                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")
@@ -130,7 +130,7 @@ class TMDBClient:
                     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")
+                        logger.warning("Rate limited, waiting %ss", retry_after)
                         await asyncio.sleep(retry_after)
                         continue
                     
@@ -142,26 +142,26 @@ class TMDBClient:
             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")
+                    logger.warning("Request timeout (attempt %s), retrying in %ss", attempt + 1, delay)
                     await asyncio.sleep(delay)
                     delay *= 2
                 else:
-                    logger.error(f"Request timed out after {max_retries} attempts")
+                    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(f"Session issue detected, recreating session: {e}")
+                    logger.warning("Session issue detected, recreating session: %s", e)
                     self.session = None
                     await self._ensure_session()
                 
                 if attempt < max_retries - 1:
-                    logger.warning(f"Request failed (attempt {attempt + 1}): {e}, retrying in {delay}s")
+                    logger.warning("Request failed (attempt %s): %s, retrying in %ss", attempt + 1, e, delay)
                     await asyncio.sleep(delay)
                     delay *= 2
                 else:
-                    logger.error(f"Request failed after {max_retries} attempts: {e}")
+                    logger.error("Request failed after %s attempts: %s", max_retries, e)
         
         raise TMDBAPIError(f"Request failed after {max_retries} attempts: {last_error}")
     
@@ -275,7 +275,7 @@ 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 +286,7 @@ 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}")

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/nfo_generator.py

@@ -209,5 +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/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

@@ -236,8 +236,8 @@ 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 +298,7 @@ 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))
@@ -724,9 +724,9 @@ 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:

src/server/api/health.py

@@ -91,7 +91,7 @@ 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 +121,7 @@ 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)}",
@@ -164,7 +164,7 @@ 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)}"
         )
@@ -236,7 +236,7 @@ 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

@@ -243,7 +243,7 @@ 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 +334,7 @@ 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)}"
@@ -429,7 +429,7 @@ async def create_nfo(
     except HTTPException:
         raise
     except TMDBAPIError as e:
-        logger.warning(f"TMDB API error creating NFO for {serie_id}: {e}")
+        logger.warning("TMDB API error creating NFO for %s: %s", serie_id, e)
         raise HTTPException(
             status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
             detail=f"TMDB API error: {str(e)}"
@@ -524,7 +524,7 @@ 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)}"

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

@@ -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 +117,7 @@ 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))
         
         # Validate schema if requested
         if validate_schema:
@@ -148,7 +148,7 @@ 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 +194,14 @@ 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 +295,7 @@ 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": [],
@@ -342,7 +342,7 @@ 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 +409,7 @@ 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 +484,12 @@ 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 +547,13 @@ 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/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
@@ -205,7 +205,7 @@ 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 +226,7 @@ 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 +253,92 @@ 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())
     
@@ -657,7 +701,7 @@ 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
 
@@ -806,7 +850,7 @@ 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
@@ -825,7 +869,7 @@ 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 +931,7 @@ 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 +952,7 @@ 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 +1006,7 @@ 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 +1093,7 @@ 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 +1115,7 @@ 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/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
 
@@ -51,7 +52,7 @@ 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 +97,11 @@ 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 as e:
-        logger.error(f"Failed to check incomplete series on startup: {e}", exc_info=True)
+    except Exception:
+        logger.exception("Failed to check incomplete series on startup")
 
 
 @asynccontextmanager

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/services/anime_service.py

@@ -524,19 +524,20 @@ class AnimeService:
                         "series_id": db_series.id,
                     }
                 
-                # 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:
@@ -545,8 +546,11 @@ class AnimeService:
                 site = getattr(serie, "site", "")
                 folder = getattr(serie, "folder", "")
                 episode_dict = 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
@@ -941,12 +945,12 @@ 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
@@ -955,7 +959,7 @@ 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
@@ -996,7 +1000,7 @@ 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
     

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."""
@@ -136,7 +139,7 @@ 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()

src/server/services/initialization_service.py

@@ -342,7 +342,7 @@ 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(

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/utils/log_manager.py

@@ -82,7 +82,7 @@ class LogManager:
             log_path = self.log_dir / log_file
 
             if not log_path.exists():
-                logger.warning(f"Log file not found: {log_file}")
+                logger.warning("Log file not found: %s", log_file)
                 return False
 
             stat = log_path.stat()
@@ -99,10 +99,10 @@ class LogManager:
             # Compress the rotated file
             self._compress_log(rotated_path)
 
-            logger.info(f"Rotated log file: {log_file} -> {rotated_name}")
+            logger.info("Rotated log file: %s -> %s", log_file, rotated_name)
             return True
         except Exception as e:
-            logger.error(f"Failed to rotate log file {log_file}: {e}")
+            logger.error("Failed to rotate log file %s: %s", log_file, e)
             return False
 
     def _compress_log(self, log_path: Path) -> bool:
@@ -122,10 +122,10 @@ class LogManager:
                     shutil.copyfileobj(f_in, f_out)
 
             log_path.unlink()
-            logger.debug(f"Compressed log file: {log_path.name}")
+            logger.debug("Compressed log file: %s", log_path.name)
             return True
         except Exception as e:
-            logger.error(f"Failed to compress log {log_path}: {e}")
+            logger.error("Failed to compress log %s: %s", log_path, e)
             return False
 
     def archive_old_logs(
@@ -160,10 +160,10 @@ class LogManager:
                             f"Failed to archive {log_file.filename}: {e}"
                         )
 
-            logger.info(f"Archived {archived_count} old log files")
+            logger.info("Archived %s old log files", archived_count)
             return archived_count
         except Exception as e:
-            logger.error(f"Failed to archive logs: {e}")
+            logger.error("Failed to archive logs: %s", e)
             return 0
 
     def search_logs(
@@ -209,7 +209,7 @@ class LogManager:
             )
             return results
         except Exception as e:
-            logger.error(f"Failed to search logs: {e}")
+            logger.error("Failed to search logs: %s", e)
             return {}
 
     def export_logs(
@@ -243,7 +243,7 @@ class LogManager:
                             arcname=log_file.filename,
                         )
 
-                logger.info(f"Exported logs to: {tar_path}")
+                logger.info("Exported logs to: %s", tar_path)
                 return True
             else:
                 # Concatenate all logs
@@ -253,10 +253,10 @@ class LogManager:
                         with open(log_file.path, "r") as in_f:
                             out_f.write(in_f.read())
 
-                logger.info(f"Exported logs to: {output_path}")
+                logger.info("Exported logs to: %s", output_path)
                 return True
         except Exception as e:
-            logger.error(f"Failed to export logs: {e}")
+            logger.error("Failed to export logs: %s", e)
             return False
 
     def get_log_stats(self) -> Dict[str, Any]:
@@ -294,7 +294,7 @@ class LogManager:
                 "newest_file": log_files[0].filename,
             }
         except Exception as e:
-            logger.error(f"Failed to get log stats: {e}")
+            logger.error("Failed to get log stats: %s", e)
             return {}
 
     def cleanup_logs(
@@ -330,16 +330,16 @@ class LogManager:
                     log_file.path.unlink()
                     total_size -= log_file.size_bytes
                     deleted_count += 1
-                    logger.debug(f"Deleted log file: {log_file.filename}")
+                    logger.debug("Deleted log file: %s", log_file.filename)
                 except Exception as e:
                     logger.warning(
                         f"Failed to delete {log_file.filename}: {e}"
                     )
 
-            logger.info(f"Cleaned up {deleted_count} log files")
+            logger.info("Cleaned up %s log files", deleted_count)
             return deleted_count
         except Exception as e:
-            logger.error(f"Failed to cleanup logs: {e}")
+            logger.error("Failed to cleanup logs: %s", e)
             return 0
 
     def set_log_level(self, logger_name: str, level: str) -> bool:
@@ -357,10 +357,10 @@ class LogManager:
             target_logger = logging.getLogger(logger_name)
             target_logger.setLevel(log_level)
 
-            logger.info(f"Set {logger_name} log level to {level}")
+            logger.info("Set %s log level to %s", logger_name, level)
             return True
         except Exception as e:
-            logger.error(f"Failed to set log level: {e}")
+            logger.error("Failed to set log level: %s", e)
             return False
 
 

src/server/utils/logging.py

@@ -416,9 +416,9 @@ def cleanup_old_logs(log_dir: Union[str, Path],
         try:
             if log_file.stat().st_mtime < cutoff_time:
                 log_file.unlink()
-                logger.info(f"Deleted old log file: {log_file}")
+                logger.info("Deleted old log file: %s", log_file)
         except Exception as e:
-            logger.error(f"Failed to delete log file {log_file}: {e}")
+            logger.error("Failed to delete log file %s: %s", log_file, e)
 
 
 # Initialize default logging configuration

src/server/utils/metrics.py

@@ -161,7 +161,7 @@ class MetricsCollector:
             Duration in seconds.
         """
         if timer_name not in self._timers:
-            logger.warning(f"Timer {timer_name} not started")
+            logger.warning("Timer %s not started", timer_name)
             return 0.0
 
         duration = time.time() - self._timers[timer_name]

src/server/utils/system.py

@@ -60,7 +60,7 @@ class SystemUtilities:
                 path=path,
             )
         except Exception as e:
-            logger.error(f"Failed to get disk usage for {path}: {e}")
+            logger.error("Failed to get disk usage for %s: %s", path, e)
             return None
 
     @staticmethod
@@ -93,7 +93,7 @@ class SystemUtilities:
 
             return disk_infos
         except Exception as e:
-            logger.error(f"Failed to get all disk usage: {e}")
+            logger.error("Failed to get all disk usage: %s", e)
             return []
 
     @staticmethod
@@ -115,7 +115,7 @@ class SystemUtilities:
 
             path = Path(directory)
             if not path.exists():
-                logger.warning(f"Directory not found: {directory}")
+                logger.warning("Directory not found: %s", directory)
                 return 0
 
             deleted_count = 0
@@ -130,16 +130,16 @@ class SystemUtilities:
                         try:
                             file_path.unlink()
                             deleted_count += 1
-                            logger.debug(f"Deleted file: {file_path}")
+                            logger.debug("Deleted file: %s", file_path)
                         except Exception as e:
                             logger.warning(
                                 f"Failed to delete {file_path}: {e}"
                             )
 
-            logger.info(f"Cleaned up {deleted_count} files from {directory}")
+            logger.info("Cleaned up %s files from %s", deleted_count, directory)
             return deleted_count
         except Exception as e:
-            logger.error(f"Failed to cleanup directory {directory}: {e}")
+            logger.error("Failed to cleanup directory %s: %s", directory, e)
             return 0
 
     @staticmethod
@@ -171,12 +171,12 @@ class SystemUtilities:
                                 f"Deleted empty directory: {dir_path}"
                             )
                     except Exception as e:
-                        logger.debug(f"Cannot delete {dir_path}: {e}")
+                        logger.debug("Cannot delete %s: %s", dir_path, e)
 
-            logger.info(f"Cleaned up {deleted_count} empty directories")
+            logger.info("Cleaned up %s empty directories", deleted_count)
             return deleted_count
         except Exception as e:
-            logger.error(f"Failed to cleanup empty directories: {e}")
+            logger.error("Failed to cleanup empty directories: %s", e)
             return 0
 
     @staticmethod
@@ -201,7 +201,7 @@ class SystemUtilities:
 
             return total_size
         except Exception as e:
-            logger.error(f"Failed to get directory size for {directory}: {e}")
+            logger.error("Failed to get directory size for %s: %s", directory, e)
             return 0
 
     @staticmethod
@@ -232,7 +232,7 @@ class SystemUtilities:
                     ),
                 )
         except Exception as e:
-            logger.error(f"Failed to get process info for {pid}: {e}")
+            logger.error("Failed to get process info for %s: %s", pid, e)
             return None
 
     @staticmethod
@@ -260,7 +260,7 @@ class SystemUtilities:
 
             return processes
         except Exception as e:
-            logger.error(f"Failed to get all processes: {e}")
+            logger.error("Failed to get all processes: %s", e)
             return []
 
     @staticmethod
@@ -285,7 +285,7 @@ class SystemUtilities:
                 "python_version": platform.python_version(),
             }
         except Exception as e:
-            logger.error(f"Failed to get system info: {e}")
+            logger.error("Failed to get system info: %s", e)
             return {}
 
     @staticmethod
@@ -308,7 +308,7 @@ class SystemUtilities:
                 "dropped_out": net_io.dropout,
             }
         except Exception as e:
-            logger.error(f"Failed to get network info: {e}")
+            logger.error("Failed to get network info: %s", e)
             return {}
 
     @staticmethod
@@ -330,7 +330,7 @@ class SystemUtilities:
             dest_path = Path(dest)
 
             if not src_path.exists():
-                logger.error(f"Source file not found: {src}")
+                logger.error("Source file not found: %s", src)
                 return False
 
             # Create temporary file
@@ -342,10 +342,10 @@ class SystemUtilities:
             # Atomic rename
             temp_path.replace(dest_path)
 
-            logger.debug(f"Atomically copied {src} to {dest}")
+            logger.debug("Atomically copied %s to %s", src, dest)
             return True
         except Exception as e:
-            logger.error(f"Failed to copy file {src} to {dest}: {e}")
+            logger.error("Failed to copy file %s to %s: %s", src, dest, e)
             return False
 
 

src/server/web/static/js/index/series-manager.js

@@ -16,7 +16,7 @@ AniWorld.SeriesManager = (function() {
     // State
     let seriesData = [];
     let filteredSeriesData = [];
-    let showMissingOnly = false;
+    let filterMode = 'all'; // 'all' | 'missing_episodes' | 'no_episodes'
     let sortAlphabetical = false;
 
     /**
@@ -24,15 +24,16 @@ AniWorld.SeriesManager = (function() {
      */
     function init() {
         bindEvents();
+        updateFilterButtonUI();
     }
 
     /**
      * Bind UI events for filtering and sorting
      */
     function bindEvents() {
-        const missingOnlyBtn = document.getElementById('show-missing-only');
-        if (missingOnlyBtn) {
-            missingOnlyBtn.addEventListener('click', toggleMissingOnlyFilter);
+        const filterBtn = document.getElementById('show-missing-only');
+        if (filterBtn) {
+            filterBtn.addEventListener('click', toggleFilterMode);
         }
 
         const sortBtn = document.getElementById('sort-alphabetical');
@@ -49,7 +50,10 @@ AniWorld.SeriesManager = (function() {
         try {
             AniWorld.UI.showLoading();
 
-            const response = await AniWorld.ApiClient.get(API.ANIME_LIST);
+            const url = filterMode && filterMode !== 'all'
+                ? `${API.ANIME_LIST}?filter=${encodeURIComponent(filterMode)}`
+                : API.ANIME_LIST;
+            const response = await AniWorld.ApiClient.get(url);
 
             if (!response) {
                 return [];
@@ -111,28 +115,28 @@ AniWorld.SeriesManager = (function() {
     }
 
     /**
-     * Toggle missing episodes only filter
+     * Cycle through filter modes:
+     *   - all: Show all series
+     *   - missing_episodes: Show only series with missing episodes
+     *   - no_episodes: Show only series with zero downloaded episodes
      */
-    function toggleMissingOnlyFilter() {
-        showMissingOnly = !showMissingOnly;
+    async function toggleFilterMode() {
         const button = document.getElementById('show-missing-only');
-
-        button.setAttribute('data-active', showMissingOnly);
-        button.classList.toggle('active', showMissingOnly);
-
         const icon = button.querySelector('i');
         const text = button.querySelector('span');
 
-        if (showMissingOnly) {
-            icon.className = 'fas fa-filter-circle-xmark';
-            text.textContent = 'Show All Series';
+        // Cycle through modes
+        if (filterMode === 'all') {
+            filterMode = 'missing_episodes';
+        } else if (filterMode === 'missing_episodes') {
+            filterMode = 'no_episodes';
         } else {
-            icon.className = 'fas fa-filter';
-            text.textContent = 'Missing Episodes Only';
+            filterMode = 'all';
         }
 
-        applyFiltersAndSort();
-        renderSeries();
+        // Update button UI and reload list based on new filter.
+        updateFilterButtonUI();
+        await loadSeries();
 
         // Clear selection when filter changes
         if (AniWorld.SelectionManager) {
@@ -140,6 +144,34 @@ AniWorld.SeriesManager = (function() {
         }
     }
 
+    /**
+     * Update the filter button UI to reflect current filter mode
+     */
+    function updateFilterButtonUI() {
+        const button = document.getElementById('show-missing-only');
+        if (!button) {
+            return;
+        }
+
+        const icon = button.querySelector('i');
+        const text = button.querySelector('span');
+
+        const isActive = filterMode !== 'all';
+        button.setAttribute('data-active', isActive);
+        button.classList.toggle('active', isActive);
+
+        if (filterMode === 'missing_episodes') {
+            icon.className = 'fas fa-filter';
+            text.textContent = 'Missing Episodes Only';
+        } else if (filterMode === 'no_episodes') {
+            icon.className = 'fas fa-ban';
+            text.textContent = 'No Episodes';
+        } else {
+            icon.className = 'fas fa-filter-circle-xmark';
+            text.textContent = 'Show All Series';
+        }
+    }
+
     /**
      * Toggle alphabetical sorting
      */
@@ -193,13 +225,6 @@ AniWorld.SeriesManager = (function() {
             }
         });
 
-        // Apply missing episodes filter
-        if (showMissingOnly) {
-            filtered = filtered.filter(function(serie) {
-                return serie.missing_episodes > 0;
-            });
-        }
-
         filteredSeriesData = filtered;
     }
 
@@ -212,9 +237,14 @@ AniWorld.SeriesManager = (function() {
             (seriesData.length > 0 ? seriesData : []);
 
         if (dataToRender.length === 0) {
-            const message = showMissingOnly ?
-                'No series with missing episodes found.' :
-                'No series found. Try searching for anime or rescanning your directory.';
+            let message;
+            if (filterMode === 'missing_episodes') {
+                message = 'No series with missing episodes found.';
+            } else if (filterMode === 'no_episodes') {
+                message = 'No series with zero downloaded episodes found.';
+            } else {
+                message = 'No series found. Try searching for anime or rescanning your directory.';
+            }
 
             grid.innerHTML =
                 '<div class="text-center" style="grid-column: 1 / -1; padding: 2rem;">' +

tests/api/test_concurrent_anime_add.py

@@ -4,12 +4,15 @@ This test verifies that the /api/anime/add endpoint can handle
 multiple concurrent requests without blocking.
 """
 import asyncio
+import logging
 import time
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 from httpx import ASGITransport, AsyncClient
 
+logger = logging.getLogger(__name__)
+
 from src.server.fastapi_app import app
 from src.server.services.auth_service import auth_service
 from src.server.services.background_loader_service import get_background_loader_service
@@ -103,7 +106,7 @@ async def test_concurrent_anime_add_requests(authenticated_client):
         f"indicating possible blocking issues"
     )
 
-    print(f"3 concurrent anime add requests completed in {total_time:.2f}s")
+    logger.info("3 concurrent anime add requests completed in %.2fs", total_time)
 
 
 @pytest.mark.asyncio
@@ -130,4 +133,4 @@ async def test_same_anime_concurrent_add(authenticated_client):
     keys = [r.json().get("key") for r in responses]
     assert keys[0] == keys[1], "Both responses should have the same key"
 
-    print(f"Concurrent same-anime requests handled correctly: {statuses}")
+    logger.info("Concurrent same-anime requests handled correctly: %s", statuses)

tests/performance/test_nfo_batch_performance.py

@@ -4,6 +4,7 @@ This module tests the performance characteristics of batch NFO creation
 including concurrent operations, TMDB API request optimization, and memory usage.
 """
 import asyncio
+import logging
 import time
 from pathlib import Path
 from typing import List
@@ -15,6 +16,8 @@ from src.core.services.nfo_service import NFOService
 from src.server.api.nfo import batch_create_nfo
 from src.server.models.nfo import NFOBatchCreateRequest
 
+logger = logging.getLogger(__name__)
+
 
 class TestConcurrentNFOCreation:
     """Test performance of concurrent NFO creation operations."""
@@ -83,8 +86,11 @@ class TestConcurrentNFOCreation:
         # Concurrent should take roughly (num_series / 5) * 0.1 = 0.2s
         assert elapsed_time < 1.0, "Concurrency not providing speedup"
         
-        print(f"\nPerformance: {num_series} series in {elapsed_time:.2f}s")
-        print(f"Rate: {num_series / elapsed_time:.2f} series/second")
+        logger.info("Batch NFO creation completed", extra={"num_series": num_series, "elapsed_s": elapsed_time})
+        logger.debug(
+            "Batch NFO creation rate",
+            extra={"series_per_second": num_series / elapsed_time},
+        )
     
     @pytest.mark.asyncio
     async def test_concurrent_nfo_creation_50_series(self):

tests/performance/test_websocket_load.py

@@ -4,6 +4,7 @@ This module tests the performance characteristics of WebSocket connections
 including concurrent clients, message throughput, and progress update throttling.
 """
 import asyncio
+import logging
 import time
 from typing import List
 from unittest.mock import AsyncMock, Mock
@@ -12,6 +13,8 @@ import pytest
 
 from src.server.services.websocket_service import WebSocketService
 
+logger = logging.getLogger(__name__)
+
 
 class MockWebSocket:
     """Mock WebSocket client for testing."""
@@ -82,8 +85,14 @@ class TestWebSocketConcurrentClients:
         for i in range(num_clients):
             await websocket_service.disconnect(f"client_{i:03d}")
         
-        print(f"\n100 clients: Broadcast in {elapsed_time:.2f}s")
-        print(f"Average per client: {elapsed_time / num_clients * 1000:.2f}ms")
+        logger.info("Broadcast completed for %d clients", num_clients, extra={"elapsed_s": elapsed_time})
+        logger.debug(
+            "Broadcast performance per client",
+            extra={
+                "num_clients": num_clients,
+                "avg_ms_per_client": elapsed_time / num_clients * 1000,
+            },
+        )
     
     @pytest.mark.asyncio
     async def test_200_concurrent_clients_scalability(self):
@@ -114,7 +123,7 @@ class TestWebSocketConcurrentClients:
         for i in range(num_clients):
             await websocket_service.disconnect(f"client_{i:03d}")
         
-        print(f"\n200 clients: Broadcast in {elapsed_time:.2f}s")
+        logger.info("Broadcast completed for %d clients", num_clients, extra={"elapsed_s": elapsed_time})
     
     @pytest.mark.asyncio
     async def test_connection_pool_efficiency(self):
@@ -144,8 +153,8 @@ class TestWebSocketConcurrentClients:
         for i in range(num_clients):
             await websocket_service.disconnect(f"client_{i:02d}")
         
-        print(f"\nConnected {num_clients} clients in {connection_time:.3f}s")
-        print(f"Average: {connection_time / num_clients * 1000:.2f}ms per connection")
+        logger.info("Connected %d clients in %.3fs", num_clients, connection_time)
+        logger.info("Average: %.2fms per connection", connection_time / num_clients * 1000)
 
 
 class TestMessageThroughput:
@@ -192,8 +201,13 @@ class TestMessageThroughput:
         for i in range(num_clients):
             await websocket_service.disconnect(f"client_{i}")
         
-        print(f"\nThroughput: {messages_per_second:.2f} messages/second")
-        print(f"Total: {num_messages} messages to {num_clients} clients in {elapsed_time:.2f}s")
+        logger.info("Throughput: %.2f messages/second", messages_per_second)
+        logger.info(
+            "Total: %d messages to %d clients in %.2fs",
+            num_messages,
+            num_clients,
+            elapsed_time,
+        )
     
     @pytest.mark.asyncio
     async def test_high_frequency_updates(self):
@@ -234,7 +248,7 @@ class TestMessageThroughput:
         for i in range(5):
             await websocket_service.disconnect(f"client_{i}")
         
-        print(f"\nHigh-frequency: {updates_per_second:.2f} updates/second")
+        logger.info("High-frequency: %.2f updates/second", updates_per_second)
     
     @pytest.mark.asyncio
     async def test_burst_message_handling(self):
@@ -275,7 +289,7 @@ class TestMessageThroughput:
         for i in range(num_clients):
             await websocket_service.disconnect(f"client_{i:02d}")
         
-        print(f"\nBurst: {num_messages} messages in {elapsed_time:.2f}s")
+        logger.info("Burst: %d messages in %.2fs", num_messages, elapsed_time)
 
 
 class TestProgressUpdateThrottling:
@@ -313,7 +327,10 @@ class TestProgressUpdateThrottling:
         
         await websocket_service.disconnect("test_client")
         
-        print(f"\nThrottling: {len(client.received_messages)} updates sent (100 possible)")
+        logger.info(
+            "Throttling: %d updates sent (100 possible)",
+            len(client.received_messages),
+        )
     
     @pytest.mark.asyncio
     async def test_throttling_reduces_network_load(self):
@@ -356,7 +373,11 @@ class TestProgressUpdateThrottling:
         for i in range(10):
             await websocket_service.disconnect(f"client_{i}")
         
-        print(f"\nThrottling: {throttled_updates}/1000 updates sent ({reduction_percent:.1f}% reduction)")
+        logger.info(
+            "Throttling: %d/1000 updates sent (%.1f%% reduction)",
+            throttled_updates,
+            reduction_percent,
+        )
 
 
 class TestRoomIsolation:
@@ -402,7 +423,7 @@ class TestRoomIsolation:
             for i in range(clients_per_room):
                 await websocket_service.disconnect(f"{room}_client_{i:02d}")
         
-        print(f"\nRoom isolation: 3 rooms × 30 clients in {elapsed_time:.2f}s")
+        logger.info("Room isolation: 3 rooms × 30 clients in %.2fs", elapsed_time)
     
     @pytest.mark.asyncio
     async def test_selective_room_broadcast_performance(self):
@@ -435,7 +456,7 @@ class TestRoomIsolation:
             for i in range(clients_per_room):
                 await websocket_service.disconnect(f"{room}_{i:02d}")
         
-        print(f"\nSelective broadcast: 25/100 clients in {elapsed_time:.3f}s")
+        logger.info("Selective broadcast: 25/100 clients in %.3fs", elapsed_time)
 
 
 class TestConnectionStability:
@@ -472,7 +493,7 @@ class TestConnectionStability:
         # All connections should be cleaned up
         assert len(websocket_service.manager._active_connections) == 0
         
-        print(f"\nRapid cycles: {cycles_per_second:.2f} cycles/second")
+        logger.info("Rapid cycles: %.2f cycles/second", cycles_per_second)
     
     @pytest.mark.asyncio
     async def test_concurrent_connect_disconnect(self):
@@ -497,7 +518,7 @@ class TestConnectionStability:
         # All should be cleaned up
         assert len(websocket_service.manager._active_connections) == 0
         
-        print(f"\nConcurrent ops: 30 clients in {elapsed_time:.2f}s")
+        logger.info("Concurrent ops: 30 clients in %.2fs", elapsed_time)
 
 
 class TestMemoryEfficiency:
@@ -533,8 +554,8 @@ class TestMemoryEfficiency:
         for i in range(100):
             await websocket_service.disconnect(f"mem_client_{i:03d}")
         
-        print(f"\nMemory: {memory_increase_mb:.2f}MB for 100 connections")
-        print(f"Per connection: {per_connection_kb:.2f}KB")
+        logger.info("Memory: %.2fMB for 100 connections", memory_increase_mb)
+        logger.info("Per connection: %.2fKB", per_connection_kb)
     
     @pytest.mark.asyncio
     async def test_message_queue_memory_efficiency(self):
@@ -567,5 +588,5 @@ class TestMemoryEfficiency:
         
         await websocket_service.disconnect("queue_test")
         
-        print(f"\nMessage queue: {total_size} bytes for 100 messages")
-        print(f"Average: {total_size / 100:.2f} bytes/message")
+        logger.info("Message queue: %d bytes for 100 messages", total_size)
+        logger.info("Average: %.2f bytes/message", total_size / 100)

tests/unit/test_nfo_service.py

@@ -424,7 +424,14 @@ class TestCreateTVShowNFO:
              patch.object(nfo_service.tmdb_client, 'get_tv_show_content_ratings', new_callable=AsyncMock) as mock_ratings, \
              patch.object(nfo_service, '_download_media_files', new_callable=AsyncMock):
             
-            mock_search.return_value = {"results": [{"id": 1429, "name": "Attack on Titan", "first_air_date": "2013-04-07"}]}
+            mock_search.return_value = {
+                "results": [{
+                    "id": 1429,
+                    "name": "Attack on Titan",
+                    "first_air_date": "2013-04-07",
+                    "overview": "Several hundred years ago, humans were nearly...",
+                }]
+            }
             mock_details.return_value = mock_tmdb_data
             mock_ratings.return_value = mock_content_ratings_de
             
@@ -463,7 +470,14 @@ class TestCreateTVShowNFO:
              patch.object(nfo_service.tmdb_client, 'get_tv_show_content_ratings', new_callable=AsyncMock) as mock_ratings, \
              patch.object(nfo_service, '_download_media_files', new_callable=AsyncMock):
             
-            mock_search.return_value = {"results": [{"id": 1429, "name": "Attack on Titan", "first_air_date": "2013-04-07"}]}
+            mock_search.return_value = {
+                "results": [{
+                    "id": 1429,
+                    "name": "Attack on Titan",
+                    "first_air_date": "2013-04-07",
+                    "overview": "Several hundred years ago, humans were nearly...",
+                }]
+            }
             mock_details.return_value = mock_tmdb_data
             mock_ratings.return_value = mock_content_ratings_no_de
             
@@ -749,7 +763,14 @@ class TestNFOServiceEdgeCases:
                 "poster_path": None, "backdrop_path": None
             }
             
-            mock_search.return_value = {"results": [{"id": 1, "name": "Series", "first_air_date": "2020-01-01"}]}
+            mock_search.return_value = {
+                "results": [{
+                    "id": 1,
+                    "name": "Series",
+                    "first_air_date": "2020-01-01",
+                    "overview": "Test overview.",
+                }]
+            }
             mock_details.return_value = tmdb_data
             mock_ratings.return_value = {"results": []}
             
@@ -1486,6 +1507,67 @@ class TestEnrichFallbackLanguages:
             content = nfo_path.read_text(encoding="utf-8")
             assert "<plot>Search result overview text.</plot>" in content
 
+    @pytest.mark.asyncio
+    async def test_en_us_search_fallback_when_german_search_overview_empty(
+        self, nfo_service, tmp_path
+    ):
+        """When the German search overview is empty, fallback to en-US search overview."""
+        series_folder = tmp_path / "Rare Anime"
+        series_folder.mkdir()
+
+        empty_data = {
+            "id": 77777, "name": "Rare Anime",
+            "original_name": "新しいアニメ", "first_air_date": "2025-01-01",
+            "overview": "",
+            "vote_average": 0, "vote_count": 0,
+            "status": "Continuing", "episode_run_time": [],
+            "genres": [], "networks": [], "production_countries": [],
+            "poster_path": None, "backdrop_path": None,
+            "external_ids": {}, "credits": {"cast": []},
+            "images": {"logos": []},
+        }
+
+        async def search_side_effect(query, language="de-DE", page=1):
+            if language == "en-US":
+                return {
+                    "results": [{
+                        "id": 77777,
+                        "name": "Rare Anime",
+                        "first_air_date": "2025-01-01",
+                        "overview": "English search overview text.",
+                    }],
+                }
+            return {
+                "results": [{
+                    "id": 77777,
+                    "name": "Rare Anime",
+                    "first_air_date": "2025-01-01",
+                    "overview": "",
+                }],
+            }
+
+        async def details_side_effect(tv_id, **kwargs):
+            return empty_data
+
+        with patch.object(nfo_service.tmdb_client, 'search_tv_show', new_callable=AsyncMock) as mock_search, \
+             patch.object(nfo_service.tmdb_client, 'get_tv_show_details', new_callable=AsyncMock) as mock_details, \
+             patch.object(nfo_service.tmdb_client, 'get_tv_show_content_ratings', new_callable=AsyncMock) as mock_ratings, \
+             patch.object(nfo_service, '_download_media_files', new_callable=AsyncMock):
+
+            mock_search.side_effect = search_side_effect
+            mock_details.side_effect = details_side_effect
+            mock_ratings.return_value = {"results": []}
+
+            nfo_path = await nfo_service.create_tvshow_nfo(
+                "Rare Anime", "Rare Anime",
+                download_poster=False, download_logo=False, download_fanart=False,
+            )
+
+            content = nfo_path.read_text(encoding="utf-8")
+            assert "<plot>English search overview text.</plot>" in content
+            assert mock_search.call_count == 2
+            assert mock_search.call_args_list[1].kwargs['language'] == 'en-US'
+
     @pytest.mark.asyncio
     async def test_no_japanese_fallback_when_english_succeeds(
         self, nfo_service, tmp_path,

tests/unit/test_nfo_update_parsing.py

@@ -1,6 +1,7 @@
 """Unit test for NFOService.update_tvshow_nfo() - tests XML parsing logic."""
 
 import asyncio
+import logging
 import shutil
 import tempfile
 from pathlib import Path
@@ -8,6 +9,8 @@ from pathlib import Path
 import pytest
 from lxml import etree
 
+logger = logging.getLogger(__name__)
+
 from src.core.services.nfo_service import NFOService
 from src.core.services.tmdb_client import TMDBAPIError
 
@@ -51,7 +54,7 @@ def test_parse_nfo_with_uniqueid():
                 break
         
         assert tmdb_id == 1429, f"Expected TMDB ID 1429, got {tmdb_id}"
-        print(f"✓ Successfully parsed TMDB ID from uniqueid: {tmdb_id}")
+        logger.info("Successfully parsed TMDB ID from uniqueid: %s", tmdb_id)
         
     finally:
         shutil.rmtree(temp_dir)
@@ -92,7 +95,7 @@ def test_parse_nfo_with_tmdbid_element():
                 tmdb_id = int(tmdbid_elem.text)
         
         assert tmdb_id == 12345, f"Expected TMDB ID 12345, got {tmdb_id}"
-        print(f"✓ Successfully parsed TMDB ID from tmdbid element: {tmdb_id}")
+        logger.info("Successfully parsed TMDB ID from tmdbid element: %s", tmdb_id)
         
     finally:
         shutil.rmtree(temp_dir)
@@ -131,7 +134,7 @@ def test_parse_nfo_without_tmdb_id():
                 tmdb_id = int(tmdbid_elem.text)
         
         assert tmdb_id is None, "Should not have found TMDB ID"
-        print("✓ Correctly identified NFO without TMDB ID")
+        logger.info("Correctly identified NFO without TMDB ID")
         
     finally:
         shutil.rmtree(temp_dir)
@@ -157,22 +160,23 @@ def test_parse_invalid_xml():
             tree = etree.parse(str(nfo_path))
             assert False, "Should have raised XMLSyntaxError"
         except etree.XMLSyntaxError:
-            print("✓ Correctly raised XMLSyntaxError for invalid XML")
+            logger.info("Correctly raised XMLSyntaxError for invalid XML")
         
     finally:
         shutil.rmtree(temp_dir)
 
 
 if __name__ == "__main__":
-    print("Testing NFO XML parsing logic...")
-    print()
-    
+    logging.basicConfig(level=logging.INFO, format="%(message)s")
+    logger.info("Testing NFO XML parsing logic...")
+    logger.info("")
+
     test_parse_nfo_with_uniqueid()
     test_parse_nfo_with_tmdbid_element()
     test_parse_nfo_without_tmdb_id()
     test_parse_invalid_xml()
-    
-    print()
-    print("=" * 60)
-    print("✓ ALL TESTS PASSED")
-    print("=" * 60)
+
+    logger.info("")
+    logger.info("%s", "=" * 60)
+    logger.info("ALL TESTS PASSED")
+    logger.info("%s", "=" * 60)

tests/unit/test_parallel_anime_add.py

@@ -5,11 +5,14 @@ each other. The background loader should process multiple series simultaneously
 rather than sequentially.
 """
 import asyncio
+import logging
 from datetime import datetime, timezone
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
+logger = logging.getLogger(__name__)
+
 from src.server.services.background_loader_service import (
     BackgroundLoaderService,
     LoadingStatus,
@@ -162,9 +165,9 @@ async def test_parallel_anime_additions(
         f"(indicating sequential processing)"
     )
     
-    print(f"✓ Parallel execution verified:")
-    print(f"  - Start time difference: {start_diff:.3f}s")
-    print(f"  - Total duration: {total_duration:.3f}s")
+    logger.info("Parallel execution verified")
+    logger.info("Start time difference: %.3fs", start_diff)
+    logger.info("Total duration: %.3fs", total_duration)
 
 
 @pytest.mark.asyncio

tests/unit/test_series_app.py

@@ -49,6 +49,33 @@ class TestSeriesAppInitialization:
         with pytest.raises(RuntimeError):
             SeriesApp(test_dir)
 
+    @patch('src.core.SeriesApp.Loaders')
+    @patch('src.core.SeriesApp.SerieScanner')
+    @patch('src.core.SeriesApp.SerieList')
+    @patch('src.core.services.nfo_factory.get_nfo_factory')
+    @patch('src.core.SeriesApp.settings')
+    def test_init_uses_config_fallback_for_nfo_service(
+        self,
+        mock_settings,
+        mock_get_factory,
+        mock_serie_list,
+        mock_scanner,
+        mock_loaders,
+    ):
+        """SeriesApp should initialize NFO via config.json even when TMDB_API_KEY is unset."""
+        test_dir = "/test/anime"
+        mock_settings.tmdb_api_key = None
+
+        mock_factory = Mock()
+        mock_service = Mock()
+        mock_factory.create.return_value = mock_service
+        mock_get_factory.return_value = mock_factory
+
+        app = SeriesApp(test_dir)
+
+        assert app.nfo_service is mock_service
+        mock_get_factory.assert_called_once()
+
 
 class TestSeriesAppSearch:
     """Test search functionality."""

tests/unit/test_series_filter.py

@@ -124,8 +124,8 @@ async def test_get_series_with_no_episodes_mixed_downloads(
     async_session: AsyncSession
 ):
     """Test series with mixed downloaded/undownloaded episodes.
-    
-    Series with ANY missing episodes (is_downloaded=False) should appear.
+
+    Series should NOT appear when there is at least one downloaded episode.
     """
     # Create series with some downloaded and some undownloaded episodes
     series = await AnimeSeriesService.create(
@@ -135,7 +135,7 @@ async def test_get_series_with_no_episodes_mixed_downloads(
         folder="Test Series Mixed (2024)",
         site="https://example.com/testmixed",
     )
-    
+
     # Add downloaded episode
     await EpisodeService.create(
         async_session,
@@ -144,7 +144,7 @@ async def test_get_series_with_no_episodes_mixed_downloads(
         episode_number=1,
         is_downloaded=True,
     )
-    
+
     # Add undownloaded episode (MISSING)
     await EpisodeService.create(
         async_session,
@@ -153,15 +153,56 @@ async def test_get_series_with_no_episodes_mixed_downloads(
         episode_number=2,
         is_downloaded=False,
     )
-    
+
     await async_session.commit()
-    
+
     # Query for series with no episodes in folder
     result = await AnimeSeriesService.get_series_with_no_episodes(
         async_session
     )
-    
-    # Should return the series because it has missing episodes
+
+    # Should not return the series because it has at least one downloaded episode
+    assert len(result) == 0
+
+
+@pytest.mark.asyncio
+async def test_get_series_with_missing_episodes_mixed_downloads(
+    async_session: AsyncSession
+):
+    """Test missing episodes filter includes series with mixed downloads."""
+    series = await AnimeSeriesService.create(
+        async_session,
+        key="test-series-mixed",
+        name="Test Series Mixed",
+        folder="Test Series Mixed (2024)",
+        site="https://example.com/testmixed",
+    )
+
+    # Add downloaded episode
+    await EpisodeService.create(
+        async_session,
+        series_id=series.id,
+        season=1,
+        episode_number=1,
+        is_downloaded=True,
+    )
+
+    # Add undownloaded episode (MISSING)
+    await EpisodeService.create(
+        async_session,
+        series_id=series.id,
+        season=1,
+        episode_number=2,
+        is_downloaded=False,
+    )
+
+    await async_session.commit()
+
+    # Query for series with missing episodes
+    result = await AnimeSeriesService.get_series_with_missing_episodes(
+        async_session
+    )
+
     assert len(result) == 1
     assert result[0].id == series.id
 
@@ -171,8 +212,8 @@ async def test_get_series_with_no_episodes_mixed_seasons(
     async_session: AsyncSession
 ):
     """Test series with some seasons downloaded, some not.
-    
-    If ANY episode is still missing (is_downloaded=False), series should appear.
+
+    Series should not appear when any episode is downloaded.
     """
     series = await AnimeSeriesService.create(
         async_session,
@@ -181,7 +222,7 @@ async def test_get_series_with_no_episodes_mixed_seasons(
         folder="Test Series (2024)",
         site="https://example.com/test",
     )
-    
+
     # Season 1: all episodes downloaded
     await EpisodeService.create(
         async_session,
@@ -190,7 +231,7 @@ async def test_get_series_with_no_episodes_mixed_seasons(
         episode_number=1,
         is_downloaded=True,
     )
-    
+
     # Season 2: has missing episode
     await EpisodeService.create(
         async_session,
@@ -199,16 +240,15 @@ async def test_get_series_with_no_episodes_mixed_seasons(
         episode_number=1,
         is_downloaded=False,
     )
-    
+
     await async_session.commit()
-    
+
     result = await AnimeSeriesService.get_series_with_no_episodes(
         async_session
     )
-    
-    # Should return the series because season 2 has missing episodes
-    assert len(result) == 1
-    assert result[0].id == series.id
+
+    # Should not return the series because it has downloaded episodes
+    assert len(result) == 0
 
 
 @pytest.mark.asyncio