def _get_ticket_for_url(self):
        return u"%s-%s" % (self.queue.slug, self.id)
Removes old statistics from the AppScale dashboard application.
dataset/ETHPy150Open rossp/django-helpdesk/helpdesk/models.py/Ticket._get_ticket_for_url--crossover with--dataset/ETHPy150Open AppScale/appscale/AppDB/groomer.py/DatastoreGroomer.remove_old_dashboard_data