[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

simple_history/management/commands/clean_duplicate_history.py

@@ -92,13 +92,15 @@ def _process(self, to_process, date_back=None, dry_run=True):
                 model_query = model_query.filter(
                     pk__in=(m_qs.values_list(model._meta.pk.name).distinct())
                 )
+
             def get_backend_name(model_class):
                 from django.db import connections, router
+
                 db_alias = router.db_for_read(model_class)
                 return connections[db_alias].engine
 
             backend_name = get_backend_name(model)
-            if backend_name != 'mssql':
+            if backend_name != "mssql":
                 _iterator = model_query.iterator()
             else:
                 _iterator = model_query