diff --git a/src/django_clickhouse/database.py b/src/django_clickhouse/database.py
index 8068d42..a658f00 100644
--- a/src/django_clickhouse/database.py
+++ b/src/django_clickhouse/database.py
@@ -27,7 +27,7 @@ class Database(InfiDatabase):
         raise NotImplementedError("This method is not supported by django_clickhouse.")
 
     def _send(self, data, settings=None, stream=False):
-        statsd_key = "%s.query" % (config.STATSD_PREFIX)
+        statsd_key = "%s.query" % config.STATSD_PREFIX
         with statsd.timer(statsd_key):
             return super(Database, self)._send(data, settings=settings, stream=stream)
 
diff --git a/src/django_clickhouse/models.py b/src/django_clickhouse/models.py
index 61eaf95..2dd8ea9 100644
--- a/src/django_clickhouse/models.py
+++ b/src/django_clickhouse/models.py
@@ -3,13 +3,13 @@ This file contains base django model to be synced with ClickHouse.
 It saves all operations to storage in order to write them to ClickHouse later.
 """
 
-from typing import Optional, Any, List, Type, Set
+from typing import Optional, Any, Type, Set
 
 import six
 from django.db import transaction
 from django.db.models.signals import post_save, post_delete
 from django.dispatch import receiver
-from django.db.models import QuesrySet as DjangoQuerySet, Manager as DjangoManager, Model as DjangoModel
+from django.db.models import QuerySet as DjangoQuerySet, Manager as DjangoManager, Model as DjangoModel
 
 from .configuration import config
 from .storages import Storage