Fixed #107 and fixed #125 -- Periodic cleanup tasks

src/pretix/base/services/cleanup.py

@@ -0,0 +1,21 @@
+from datetime import timedelta
+
+from django.dispatch import receiver
+from django.utils.timezone import now
+
+from ..models import CachedFile, CartPosition, InvoiceAddress
+from ..signals import periodic_task
+
+
+@receiver(signal=periodic_task)
+def clean_cart_positions(sender, **kwargs):
+    for cp in CartPosition.objects.filter(expires__lt=now() - timedelta(days=14)):
+        cp.delete()
+    for ia in InvoiceAddress.objects.filter(order__isnull=True, last_modified__lt=now() - timedelta(days=14)):
+        ia.delete()
+
+
+@receiver(signal=periodic_task)
+def clean_cached_files(sender, **kwargs):
+    for cf in CachedFile.objects.filter(expires__isnull=False, expires__lt=now()):
+        cf.delete()