fix(timezone):修复触发告警记录的时间混乱问题

api/alarm.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone, timedelta
 from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Body
@@ -23,6 +23,35 @@ class AlarmUpdateRequest(BaseModel):
     processed: 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
+
+
+def format_alarm_response(alarm) -> dict:
+    """格式化告警响应，将 UTC 时间转换为中国时间"""
+    return {
+        "id": alarm.id,
+        "camera_id": alarm.camera_id,
+        "roi_id": alarm.roi_id,
+        "event_type": alarm.event_type,
+        "confidence": alarm.confidence,
+        "snapshot_path": alarm.snapshot_path,
+        "llm_checked": alarm.llm_checked,
+        "llm_result": alarm.llm_result,
+        "processed": alarm.processed,
+        "created_at": convert_to_china_time(alarm.created_at),
+    }
+
+
 @router.get("", response_model=List[dict])
 def list_alarms(
     camera_id: Optional[int] = None,
@@ -32,21 +61,7 @@ def list_alarms(
     db: Session = Depends(get_db),
 ):
     alarms = get_alarms(db, camera_id=camera_id, event_type=event_type, limit=limit, offset=offset)
-    return [
-        {
-            "id": alarm.id,
-            "camera_id": alarm.camera_id,
-            "roi_id": alarm.roi_id,
-            "event_type": alarm.event_type,
-            "confidence": alarm.confidence,
-            "snapshot_path": alarm.snapshot_path,
-            "llm_checked": alarm.llm_checked,
-            "llm_result": alarm.llm_result,
-            "processed": alarm.processed,
-            "created_at": alarm.created_at.isoformat() if alarm.created_at else None,
-        }
-        for alarm in alarms
-    ]
+    return [format_alarm_response(alarm) for alarm in alarms]
 
 
 @router.get("/stats")
@@ -62,18 +77,7 @@ def get_alarm(alarm_id: int, db: Session = Depends(get_db)):
     alarm = next((a for a in alarms if a.id == alarm_id), None)
     if not alarm:
         raise HTTPException(status_code=404, detail="告警不存在")
-    return {
-        "id": alarm.id,
-        "camera_id": alarm.camera_id,
-        "roi_id": alarm.roi_id,
-        "event_type": alarm.event_type,
-        "confidence": alarm.confidence,
-        "snapshot_path": alarm.snapshot_path,
-        "llm_checked": alarm.llm_checked,
-        "llm_result": alarm.llm_result,
-        "processed": alarm.processed,
-        "created_at": alarm.created_at.isoformat() if alarm.created_at else None,
-    }
+    return format_alarm_response(alarm)
 
 
 @router.put("/{alarm_id}")

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),
     }