diff --git a/swh/storage/storage.py b/swh/storage/storage.py
--- a/swh/storage/storage.py
+++ b/swh/storage/storage.py
@@ -1066,6 +1066,7 @@
         else:
             return None
 
+
     @db_transaction
     def stat_counters(self, cur=None):
         """compute statistics about the number of tuples in various tables