Minor update for sites and domains

app/models/site_domain_models.py

@@ -1,4 +1,3 @@
-from __future__ import annotations
 import datetime, hashlib, logging, os, pytz, redis, secrets
 
 from typing import Dict, List, Optional, Set, Union
@@ -62,5 +61,3 @@ class Site_Domain_Base(BaseModel):
     class Config:
         underscore_attrs_are_private = True
         fields = base_fields
-
-Site_Domain_Base.update_forward_refs()