执行 Ruff 安全自动修复

web/backend/models.py

@@ -2,21 +2,22 @@
 
 from __future__ import annotations
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
+
 from sqlalchemy import (
-    Column,
-    Integer,
-    String,
+    JSON,
     Boolean,
-    Text,
     DateTime,
     ForeignKey,
-    JSON,
+    Integer,
+    String,
+    Text,
     UniqueConstraint,
 )
 from sqlalchemy.orm import Mapped, mapped_column, relationship
-from .database import Base
+
 from .crypto_storage import EncryptedText
+from .database import Base
 from .huya_defaults import (
     HUYA_DEFAULT_BIND_ACT_ID,
     HUYA_DEFAULT_OUTER_ACT_ID,
@@ -28,7 +29,7 @@ from .huya_defaults import (
 
 def _utcnow():
     """返回时区感知的 UTC 当前时间，替代 _utcnow()。"""
-    return datetime.now(timezone.utc)
+    return datetime.now(UTC)
 
 
 class User(Base):