执行 Ruff 安全自动修复

web/backend/services/douyu_service.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 
 from sqlalchemy import select
 from sqlalchemy.orm import Session
@@ -13,7 +13,6 @@ from core.douyu.cookie_utils import cookie_value
 
 from ..models import Account, DouyuConfig, DouyuTask, LoginTask
 
-
 SUPPORTED_DOUYU_TASK_TYPES = {
     "get_bind_qr": "获取绑定二维码",
     "confirm_bind": "确认绑定",
@@ -302,7 +301,7 @@ def cleanup_orphan_douyu_tasks(
     tasks = query.all()
     if not tasks:
         return 0
-    now = datetime.now(timezone.utc)
+    now = datetime.now(UTC)
     for task in tasks:
         task.status = "stopped"
         task.message = message
@@ -426,7 +425,7 @@ def douyu_task_payload(task: DouyuTask, *, include_detail: bool = False) -> dict
         if value is None:
             return None
         if value.tzinfo is None:
-            value = value.replace(tzinfo=timezone.utc)
+            value = value.replace(tzinfo=UTC)
         return value.isoformat()
 
     return {