fix: import Origin at time of use in models.base

was previously removed to prevent circ import

app/models/base.py

@@ -49,6 +49,9 @@ class Group(AbstractConfiguration):
         )
 
     def to_dict(self) -> GroupDict:
+        if not TYPE_CHECKING:
+            from app.models.mirrors import Origin  # to prevent circular import
+
         active_origins_query = (
             db.session.query(aliased(Origin))
             .filter(and_(Origin.group_id == self.id, Origin.destroyed.is_(None)))