diff --git a/explorer/tasks.py b/explorer/tasks.py
index a1eb6289..cceddcbb 100644
--- a/explorer/tasks.py
+++ b/explorer/tasks.py
@@ -18,28 +18,28 @@
     from celery.utils.log import get_task_logger
 
     from explorer.utils import s3_upload
+
     logger = get_task_logger(__name__)
 else:
     import logging
 
     from explorer.utils import noop_decorator as shared_task
+
     logger = logging.getLogger(__name__)
 
 
 @shared_task
 def execute_query(query_id, email_address):
     q = Query.objects.get(pk=query_id)
-    send_mail("[SQL Explorer] Your query is running...",
-              f"{q.title} is running and should be in your inbox soon!",
-              app_settings.FROM_EMAIL,
-              [email_address])
+    send_mail(
+        "[SQL Explorer] Your query is running...",
+        f"{q.title} is running and should be in your inbox soon!",
+        app_settings.FROM_EMAIL,
+        [email_address],
+    )
 
     exporter = get_exporter_class("csv")(q)
-    random_part = "".join(
-        random.choice(
-            string.ascii_uppercase + string.digits
-        ) for _ in range(20)
-    )
+    random_part = "".join(random.choice(string.ascii_uppercase + string.digits) for _ in range(20))
     try:
         url = s3_upload(f"{random_part}.csv", convert_csv_to_bytesio(exporter))
         subj = f'[SQL Explorer] Report "{q.title}" is ready'
@@ -66,19 +66,12 @@ def snapshot_query(query_id):
         logger.info(f"Starting snapshot for query {query_id}...")
         q = Query.objects.get(pk=query_id)
         exporter = get_exporter_class("csv")(q)
-        k = "query-{}/snap-{}.csv".format(
-            q.id,
-            date.today().strftime("%Y%m%d-%H:%M:%S")
-        )
+        k = "query-{}/snap-{}.csv".format(q.id, date.today().strftime("%Y%m%d-%H:%M:%S"))
         logger.info(f"Uploading snapshot for query {query_id} as {k}...")
         url = s3_upload(k, convert_csv_to_bytesio(exporter))
-        logger.info(
-            f"Done uploading snapshot for query {query_id}. URL: {url}"
-        )
+        logger.info(f"Done uploading snapshot for query {query_id}. URL: {url}")
     except Exception as e:
-        logger.warning(
-            f"Failed to snapshot query {query_id} ({e}). Retrying..."
-        )
+        logger.warning(f"Failed to snapshot query {query_id} ({e}). Retrying...")
         snapshot_query.retry()
 
 
@@ -86,9 +79,7 @@ def snapshot_query(query_id):
 def snapshot_queries():
     logger.info("Starting query snapshots...")
     qs = Query.objects.filter(snapshot=True).values_list("id", flat=True)
-    logger.info(
-        f"Found {len(qs)} queries to snapshot. Creating snapshot tasks..."
-    )
+    logger.info(f"Found {len(qs)} queries to snapshot. Creating snapshot tasks...")
     for qid in qs:
         snapshot_query.delay(qid)
     logger.info("Done creating tasks.")
@@ -96,12 +87,8 @@ def snapshot_queries():
 
 @shared_task
 def truncate_querylogs(days):
-    qs = QueryLog.objects.filter(
-        run_at__lt=datetime.now() - timedelta(days=days)
-    )
-    logger.info(
-        f"Deleting {qs.count} QueryLog objects older than {days} days."
-    )
+    qs = QueryLog.objects.filter(run_at__lt=datetime.now() - timedelta(days=days))
+    logger.info(f"Deleting {qs.count()} QueryLog objects older than {days} days.")
     qs.delete()
     logger.info("Done deleting QueryLog objects.")
 
@@ -109,19 +96,21 @@ def truncate_querylogs(days):
 @shared_task
 def build_schema_cache_async(connection_alias):
     from .schema import (
-        build_schema_info, connection_schema_cache_key, connection_schema_json_cache_key, transform_to_json_schema,
+        build_schema_info,
+        connection_schema_cache_key,
+        connection_schema_json_cache_key,
+        transform_to_json_schema,
     )
+
     ret = build_schema_info(connection_alias)
     cache.set(connection_schema_cache_key(connection_alias), ret)
-    cache.set(connection_schema_json_cache_key(connection_alias),
-              transform_to_json_schema(ret))
+    cache.set(connection_schema_json_cache_key(connection_alias), transform_to_json_schema(ret))
     return ret
 
 
 @shared_task
 def remove_unused_sqlite_dbs():
-    uploaded_dbs = DatabaseConnection.objects.filter(engine=DatabaseConnection.SQLITE,
-                                                     host__isnull=False)
+    uploaded_dbs = DatabaseConnection.objects.filter(engine=DatabaseConnection.SQLITE, host__isnull=False)
     for db in uploaded_dbs:
         if os.path.exists(db.local_name):
             recent_run = QueryLog.objects.filter(connection=db.alias).first()