Refactor backend to use request-scoped SQLite connections

backend/app/routers/bans.py

@@ -17,7 +17,7 @@ if TYPE_CHECKING:
 
 from fastapi import APIRouter, HTTPException, Request, status
 
-from app.dependencies import AuthDep
+from app.dependencies import AuthDep, DbDep
 from app.models.ban import ActiveBanListResponse, BanRequest, UnbanAllResponse, UnbanRequest
 from app.models.jail import JailCommandResponse
 from app.services import geo_service, jail_service
@@ -50,6 +50,7 @@ def _bad_gateway(exc: Exception) -> HTTPException:
 async def get_active_bans(
     request: Request,
     _auth: AuthDep,
+    db: DbDep,
 ) -> ActiveBanListResponse:
     """Return every IP that is currently banned across all fail2ban jails.
 
@@ -68,14 +69,13 @@ async def get_active_bans(
     """
     socket_path: str = request.app.state.settings.fail2ban_socket
     http_session: aiohttp.ClientSession = request.app.state.http_session
-    app_db = request.app.state.db
 
     try:
         return await jail_service.get_active_bans(
             socket_path,
             geo_batch_lookup=geo_service.lookup_batch,
             http_session=http_session,
-            app_db=app_db,
+            app_db=db,
         )
     except Fail2BanConnectionError as exc:
         raise _bad_gateway(exc) from exc