Refactor backend to use request-scoped SQLite connections

backend/app/routers/config.py

@@ -43,7 +43,7 @@ from typing import Annotated
 import structlog
 from fastapi import APIRouter, HTTPException, Path, Query, Request, status
 
-from app.dependencies import AuthDep
+from app.dependencies import AuthDep, DbDep
 from app.models.config import (
     ActionConfig,
     ActionCreateRequest,
@@ -594,6 +594,7 @@ async def preview_log(
 async def get_map_color_thresholds(
     request: Request,
     _auth: AuthDep,
+    db: DbDep,
 ) -> MapColorThresholdsResponse:
     """Return the configured map color thresholds.
 
@@ -607,7 +608,7 @@ async def get_map_color_thresholds(
     """
     from app.services import setup_service
 
-    high, medium, low = await setup_service.get_map_color_thresholds(request.app.state.db)
+    high, medium, low = await setup_service.get_map_color_thresholds(db)
     return MapColorThresholdsResponse(
         threshold_high=high,
         threshold_medium=medium,
@@ -623,6 +624,7 @@ async def get_map_color_thresholds(
 async def update_map_color_thresholds(
     request: Request,
     _auth: AuthDep,
+    db: DbDep,
     body: MapColorThresholdsUpdate,
 ) -> MapColorThresholdsResponse:
     """Update the map color threshold configuration.
@@ -644,7 +646,7 @@ async def update_map_color_thresholds(
 
     try:
         await setup_service.set_map_color_thresholds(
-            request.app.state.db,
+            db,
             threshold_high=body.threshold_high,
             threshold_medium=body.threshold_medium,
             threshold_low=body.threshold_low,