chrono: add script to find invalid exclusion periods (#72625)

scripts/chrono/find_exclusion_periods_with_weekday_indexes.py

@@ -0,0 +1,8 @@
+from django.db import connection
+
+from chrono.agendas.models import TimePeriod
+
+
+periods = TimePeriod.objects.filter(agenda__isnull=False, weekday_indexes__isnull=False)
+if periods.exists():
+    print(connection.schema_name, [tp.agenda.get_absolute_url() for tp in periods])