fix(timezone):修复触发告警记录的时间混乱问题

api/camera.py

@@ -1,3 +1,4 @@
+from datetime import datetime, timezone, timedelta
 from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Body
@@ -26,6 +27,19 @@ class CameraUpdateRequest(BaseModel):
     enabled: Optional[bool] = None
 
 
+def convert_to_china_time(dt: Optional[datetime]) -> Optional[str]:
+    """将 UTC 时间转换为中国时间 (UTC+8)"""
+    if dt is None:
+        return None
+    try:
+        china_tz = timezone(timedelta(hours=8))
+        if dt.tzinfo is None:
+            dt = dt.replace(tzinfo=timezone.utc)
+        return dt.astimezone(china_tz).isoformat()
+    except Exception:
+        return dt.isoformat() if dt else None
+
+
 @router.get("", response_model=List[dict])
 def list_cameras(
     enabled_only: bool = True,
@@ -40,7 +54,7 @@ def list_cameras(
             "enabled": cam.enabled,
             "fps_limit": cam.fps_limit,
             "process_every_n_frames": cam.process_every_n_frames,
-            "created_at": cam.created_at.isoformat() if cam.created_at else None,
+            "created_at": convert_to_china_time(cam.created_at),
         }
         for cam in cameras
     ]
@@ -58,7 +72,7 @@ def get_camera(camera_id: int, db: Session = Depends(get_db)):
         "enabled": camera.enabled,
         "fps_limit": camera.fps_limit,
         "process_every_n_frames": camera.process_every_n_frames,
-        "created_at": camera.created_at.isoformat() if camera.created_at else None,
+        "created_at": convert_to_china_time(camera.created_at),
     }