feat: use custom type to handle existing naive datetimes

app/models/onions.py

@@ -7,6 +7,7 @@ from app.brm.brn import BRN
 from app.extensions import db
 from app.models import AbstractConfiguration, AbstractResource
 from app.models.base import Group
+from app.models.types import AwareDateTime
 from app.util.onion import onion_hostname
 
 
@@ -36,7 +37,7 @@ class Onion(AbstractConfiguration):
 
     group_id: Mapped[int] = mapped_column(db.ForeignKey("group.id"))
     domain_name: Mapped[str]
-    cert_expiry: Mapped[datetime] = mapped_column(db.DateTime(timezone=True))
+    cert_expiry: Mapped[datetime] = mapped_column(AwareDateTime())
     cert_sans: Mapped[str]
     onion_public_key: Mapped[bytes]
     onion_private_key: Mapped[bytes]