remove class_registry

Author: svlandeg

sqlmodel/main.py

@@ -3,7 +3,6 @@
 import builtins
 import ipaddress
 import uuid
-import weakref
 from collections.abc import Callable, Mapping, Sequence, Set
 from dataclasses import dataclass
 from datetime import date, datetime, time, timedelta
@@ -797,8 +796,6 @@ def get_column_from_field(field: Any) -> Column:
     return Column(sa_type, *args, **kwargs)
 
 
-class_registry = weakref.WeakValueDictionary()
-
 default_registry = registry()
 
 _TSQLModel = TypeVar("_TSQLModel", bound="SQLModel")