Closes #16388: Move change logging resources from extras to core (#16545)

* Initial work on #16388

* Misc cleanup

netbox/core/querysets.py

@@ -0,0 +1,26 @@
+from django.apps import apps
+from django.contrib.contenttypes.models import ContentType
+from django.db.utils import ProgrammingError
+
+from utilities.querysets import RestrictedQuerySet
+
+__all__ = (
+    'ObjectChangeQuerySet',
+)
+
+
+class ObjectChangeQuerySet(RestrictedQuerySet):
+
+    def valid_models(self):
+        # Exclude any change records which refer to an instance of a model that's no longer installed. This
+        # can happen when a plugin is removed but its data remains in the database, for example.
+        try:
+            content_types = ContentType.objects.get_for_models(*apps.get_models()).values()
+        except ProgrammingError:
+            # Handle the case where the database schema has not yet been initialized
+            content_types = ContentType.objects.none()
+
+        content_type_ids = set(
+            ct.pk for ct in content_types
+        )
+        return self.filter(changed_object_type_id__in=content_type_ids)