diff --git a/pandora/app/tasks.py b/pandora/app/tasks.py
new file mode 100644
index 00000000..3ac03816
--- /dev/null
+++ b/pandora/app/tasks.py
@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+import datetime
+
+from celery.decorators import task, periodic_task
+from celery.task.schedules import crontab
+
+
+@periodic_task(run_every=crontab(hour=6, minute=0), queue='encoding')
+def cron(**kwargs):
+    from django.db import transaction
+    from django.contrib.sessions.models import Session
+    Session.objects.filter(expire_date__lt=datetime.datetime.now()).delete()
+    transaction.commit_unless_managed()