Prune bans caches.

misago/users/management/commands/bansmaintenance.py

@@ -1,5 +1,6 @@
 from django.core.management.base import BaseCommand
 from django.utils import timezone
+from misago.core import cachebuster
 from misago.users.models import BanCache
 
 
@@ -22,4 +23,9 @@ class Command(BaseCommand):
         queryset = queryset.filter(valid_until__lte=timezone.now().date())
 
         expired_count = queryset.delete()
+
+        bans_version = get_version('misago_bans')
+        queryset = BanCache.objects.filter(bans_version__lt=bans_version)
+        expired_count += queryset.delete()
+
         self.stdout.write('Ban caches emptied: %s' expired_count)