feat: use custom type to handle existing naive datetimes

app/models/cloud.py

@@ -1,5 +1,5 @@
 import enum
-from typing import Any, Dict, List, TYPE_CHECKING
+from typing import TYPE_CHECKING, Any, Dict, List
 
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
@@ -8,7 +8,6 @@ from app.extensions import db
 from app.models import AbstractConfiguration
 from app.models.mirrors import StaticOrigin
 
-
 if TYPE_CHECKING:
     from app.models.bridges import Bridge