Centralise DbDep and mark Task 11 complete

Docs/Tasks.md

@@ -214,6 +214,8 @@ Reference: `Docs/Refactoring.md` for full analysis of each issue.
 
 **Why this is needed:** A single definition of `DbDep` ensures that any future change to the db dependency (e.g. adding row factory configuration) is applied uniformly across all routers.
 
+**Status:** Completed ✅
+
 ---
 
 ### Task 12 — Complete the protocol injection layer or remove it

backend/app/routers/blocklist.py

@@ -22,19 +22,16 @@ registered *before* the ``/{id}`` routes so FastAPI resolves them correctly.
 
 from __future__ import annotations
 
-from typing import Annotated
-
-import aiosqlite
-from fastapi import APIRouter, Depends, HTTPException, Query, status
+from fastapi import APIRouter, HTTPException, Query, status
 
 from app.dependencies import (
     AuthDep,
+    DbDep,
     Fail2BanSocketDep,
     GeoBatchLookupDep,
     HttpSessionDep,
     SchedulerDep,
     SettingsDep,
-    get_db,
 )
 from app.models.blocklist import (
     BlocklistListResponse,
@@ -52,8 +49,6 @@ from app.tasks.blocklist_import import run_import_with_resources
 
 router: APIRouter = APIRouter(prefix="/api/blocklists", tags=["Blocklists"])
 
-DbDep = Annotated[aiosqlite.Connection, Depends(get_db)]
-
 
 # ---------------------------------------------------------------------------
 # Source list + create

backend/app/routers/geo.py

@@ -13,18 +13,17 @@ from typing import TYPE_CHECKING, Annotated
 if TYPE_CHECKING:
     from app.services.jail_service import IpLookupResult
 
-import aiosqlite
-from fastapi import APIRouter, Depends, HTTPException, Path, status
+from fastapi import APIRouter, HTTPException, Path, status
 
 from app.dependencies import (
     AuthDep,
+    DbDep,
     Fail2BanSocketDep,
     HttpSessionDep,
-    get_db,
 )
+from app.exceptions import Fail2BanConnectionError
 from app.models.geo import GeoCacheStatsResponse, GeoReResolveResponse, IpLookupResponse
 from app.services import geo_service, jail_service
-from app.exceptions import Fail2BanConnectionError
 
 router: APIRouter = APIRouter(prefix="/api/geo", tags=["Geo"])
 
@@ -99,7 +98,7 @@ async def lookup_ip(
 )
 async def geo_stats(
     _auth: AuthDep,
-    db: Annotated[aiosqlite.Connection, Depends(get_db)],
+    db: DbDep,
 ) -> GeoCacheStatsResponse:
     """Return diagnostic counters for the geo cache subsystem.
 
@@ -123,7 +122,7 @@ async def geo_stats(
 )
 async def re_resolve_geo(
     _auth: AuthDep,
-    db: Annotated[aiosqlite.Connection, Depends(get_db)],
+    db: DbDep,
     http_session: HttpSessionDep,
 ) -> GeoReResolveResponse:
     """Retry geo resolution for every IP in ``geo_cache`` with a null country.