changed default time range for dashboards

dashboards/dashboard_base.py

@@ -96,7 +96,7 @@ def build_row_repeat_dashboard(
             ),
         ],
         templating=Templating([panel_repeat_var, row_repeat_var, *other_vars]),
-        time=Time('now-7d', 'now'),
+        time=Time('now-30d', 'now'),
         annotations=annotations,
     )
     return dashboard.auto_panel_ids()