diff --git a/sql-schema/276.sql b/sql-schema/276.sql
new file mode 100644
index 0000000000..12786812cb
--- /dev/null
+++ b/sql-schema/276.sql
@@ -0,0 +1,2 @@
+DELETE FROM dashboards WHERE user_id NOT IN (SELECT user_id FROM users) AND dashboard_id NOT IN (SELECT DISTINCT dashboard_id FROM users_widgets);
+UPDATE dashboards SET user_id = (SELECT user_id FROM users WHERE level = 10 LIMIT 1) WHERE user_id NOT IN (SELECT user_id FROM users);