rebaseme: actual model base

Author: asottile-sentry

src/sentry/db/models/manager/base.py

@@ -6,13 +6,13 @@
 from collections.abc import Callable, Collection, Generator, Mapping, MutableMapping, Sequence
 from contextlib import contextmanager
 from enum import IntEnum, auto
-from typing import TYPE_CHECKING, Any
+from typing import Any
 
 from django.conf import settings
 from django.db import models, router
 from django.db.models import Model
 from django.db.models.fields import Field
-from django.db.models.manager import BaseManager as DjangoBaseManager
+from django.db.models.manager import Manager as DjangoBaseManager
 from django.db.models.signals import class_prepared, post_delete, post_init, post_save
 from django.utils.encoding import smart_str
 
@@ -69,12 +69,7 @@ def make_key(model: Any, prefix: str, kwargs: Mapping[str, Model | int | str]) -
     return f"{prefix}:{model.__name__}:{md5_text(kwargs_bits_str).hexdigest()}"
 
 
-if TYPE_CHECKING:
-    from django.db.models.manager import Manager
-
-    _base_manager_base = Manager[M]
-else:
-    _base_manager_base = DjangoBaseManager.from_queryset(BaseQuerySet)
+_base_manager_base = DjangoBaseManager.from_queryset(BaseQuerySet, "_base_manager_base")
 
 
 class BaseManager(_base_manager_base[M]):