Refactor backend to use request-scoped SQLite connections

backend/app/routers/history.py

@@ -22,7 +22,7 @@ if TYPE_CHECKING:
 
 from fastapi import APIRouter, HTTPException, Query, Request
 
-from app.dependencies import AuthDep
+from app.dependencies import AuthDep, DbDep
 from app.models.ban import BanOrigin, TimeRange
 from app.models.history import HistoryListResponse, IpDetailResponse
 from app.services import geo_service, history_service
@@ -40,6 +40,7 @@ _DEFAULT_PAGE_SIZE: int = 100
 async def get_history(
     request: Request,
     _auth: AuthDep,
+    db: DbDep,
     range: TimeRange | None = Query(
         default=None,
         description="Optional time-range filter. Omit for all-time.",
@@ -102,7 +103,7 @@ async def get_history(
         page=page,
         page_size=page_size,
         geo_enricher=_enricher,
-        db=request.app.state.db,
+        db=db,
     )
 
 
@@ -114,6 +115,7 @@ async def get_history(
 async def get_history_archive(
     request: Request,
     _auth: AuthDep,
+    db: DbDep,
     range: TimeRange | None = Query(
         default=None,
         description="Optional time-range filter. Omit for all-time.",
@@ -138,7 +140,7 @@ async def get_history_archive(
         page=page,
         page_size=page_size,
         geo_enricher=_enricher,
-        db=request.app.state.db,
+        db=db,
     )