ADD: dav_events: purging participants.

dav_events/utils.py

@@ -0,0 +1,13 @@
+import logging
+from django.utils import timezone
+
+from .models import Participant
+
+logger = logging.getLogger(__name__)
+
+
+def purge_participants():
+    now = timezone.now()
+    for p in Participant.objects.filter(purge_at__lte=now):
+        logger.info('Purge participant \'%s\'', p)
+        p.delete()