Use explicit AppState dependency in config router and update task status

Docs/Tasks.md

@@ -11,6 +11,7 @@ Reference: `Docs/Refactoring.md` for full analysis of each issue.
 ### Backend Architecture Review Findings
 
 - Status: **done** — `backend/app/routers/config.py` now uses explicit dependency injection for fail2ban settings and no longer reads `request.app.state.settings` directly.
+- Status: **done** — `backend/app/routers/config.py` now uses an explicit `AppState` dependency for pending recovery and activation state instead of writing `request.app.state` directly.
 
 - `backend/app/routers/*` often reads config directly from `request.app.state.settings` instead of using dependency injection. This bypasses the dependency layer and creates hidden coupling between routers and application state.
   - Fix: replace direct `request.app.state.settings` access with `SettingsDep` or other explicit dependencies such as `ServerStatusDep` and `PendingRecoveryDep` in router function signatures.
@@ -34,7 +35,7 @@ Reference: `Docs/Refactoring.md` for full analysis of each issue.
 
 ### Recommended refactors for an AI agent
 
-- Standardise dependency injection in routers by using `SettingsDep`, `ServerStatusDep`, `PendingRecoveryDep`, and other dependency definitions from `backend/app/dependencies.py`.
+- Status: **done** — Standardise dependency injection in routers by using `SettingsDep`, `ServerStatusDep`, `PendingRecoveryDep`, and other dependency definitions from `backend/app/dependencies.py`.
 - Refactor `backend/app/utils/` so it does not import business-layer services. Move cross-layer helpers to the appropriate layer or introduce a shared helper package if needed.
 - Simplify background task DB management in `backend/app/tasks/`: remove the dead `app.state.db` logic or implement a real shared connection and document its lifecycle.
 - Document auth cache semantics in the code and project docs. If cluster deployments are intended, replace the process-local cache with a shared cache or remove it.

backend/app/dependencies.py

@@ -6,12 +6,15 @@ Routers import directly from this module — never from ``app.state``
 directly — to keep coupling explicit and testable.
 """
 
+import datetime
 import time
 from collections.abc import AsyncGenerator
 from typing import Annotated, Protocol, cast
 
+import aiohttp
 import aiosqlite
 import structlog
+from apscheduler.schedulers.asyncio import AsyncIOScheduler  # type: ignore[import-untyped]
 from fastapi import Depends, HTTPException, Request, status
 
 from app.config import Settings
@@ -20,9 +23,6 @@ from app.models.config import PendingRecovery
 from app.models.server import ServerStatus
 from app.utils.time_utils import utc_now
 
-import aiohttp
-from apscheduler.schedulers.asyncio import AsyncIOScheduler  # type: ignore[import-untyped]
-
 log: structlog.stdlib.BoundLogger = structlog.get_logger()
 
 
@@ -32,6 +32,9 @@ class AppState(Protocol):
     settings: Settings
     http_session: aiohttp.ClientSession
     scheduler: AsyncIOScheduler
+    server_status: ServerStatus
+    pending_recovery: PendingRecovery | None
+    last_activation: dict[str, datetime.datetime] | None
 
 
 _COOKIE_NAME = "bangui_session"
@@ -173,6 +176,11 @@ async def get_fail2ban_start_command(settings: Settings = Depends(get_settings))
     """Provide the configured fail2ban start command."""
     return settings.fail2ban_start_command
 
+async def get_app_state(request: Request) -> AppState:
+    """Provide the application state object for the current request."""
+    return cast("AppState", request.app.state)
+
+
 async def get_server_status(request: Request) -> ServerStatus:
     """Return the cached fail2ban server status snapshot from app state."""
     state = cast("AppState", request.app.state)
@@ -255,4 +263,5 @@ Fail2BanConfigDirDep = Annotated[str, Depends(get_fail2ban_config_dir)]
 Fail2BanStartCommandDep = Annotated[str, Depends(get_fail2ban_start_command)]
 ServerStatusDep = Annotated[ServerStatus, Depends(get_server_status)]
 PendingRecoveryDep = Annotated[PendingRecovery | None, Depends(get_pending_recovery)]
+AppStateDep = Annotated[AppState, Depends(get_app_state)]
 AuthDep = Annotated[Session, Depends(require_auth)]

backend/app/routers/config.py

@@ -44,6 +44,7 @@ import structlog
 from fastapi import APIRouter, HTTPException, Path, Query, Request, status
 
 from app.dependencies import (
+    AppStateDep,
     AuthDep,
     DbDep,
     Fail2BanConfigDirDep,
@@ -678,6 +679,7 @@ async def update_map_color_thresholds(
 async def activate_jail(
     request: Request,
     _auth: AuthDep,
+    app_state: AppStateDep,
     config_dir: Fail2BanConfigDirDep,
     socket_path: Fail2BanSocketDep,
     name: _NamePath,
@@ -728,7 +730,7 @@ async def activate_jail(
 
     # Record this activation so the health-check task can attribute a
     # subsequent fail2ban crash to it.
-    request.app.state.last_activation = {
+    app_state.last_activation = {
         "jail_name": name,
         "at": datetime.datetime.now(tz=datetime.UTC),
     }
@@ -736,9 +738,9 @@ async def activate_jail(
     # If fail2ban stopped responding after the reload, create a pending-recovery
     # record immediately (before the background health task notices).
     if not result.fail2ban_running:
-        request.app.state.pending_recovery = PendingRecovery(
+        app_state.pending_recovery = PendingRecovery(
             jail_name=name,
-            activated_at=request.app.state.last_activation["at"],
+            activated_at=app_state.last_activation["at"],
             detected_at=datetime.datetime.now(tz=datetime.UTC),
         )
 
@@ -932,6 +934,7 @@ async def get_pending_recovery(
 async def rollback_jail(
     request: Request,
     _auth: AuthDep,
+    app_state: AppStateDep,
     config_dir: Fail2BanConfigDirDep,
     socket_path: Fail2BanSocketDep,
     start_cmd: Fail2BanStartCommandDep,
@@ -971,8 +974,8 @@ async def rollback_jail(
 
     # Clear pending recovery if fail2ban came back online.
     if result.fail2ban_running:
-        request.app.state.pending_recovery = None
+        app_state.pending_recovery = None
-        request.app.state.last_activation = None
+        app_state.last_activation = None
 
     return result