I've setup this task queue implementation on a site I host for a customer, it has a cron job which runs each morning at 2am "/admin/tasks/queue", this queues up emails to be sent out, "/admin/tasks/email", and uses cursors so as to do the queuing in small chunks. For some reason last night /admin/tasks/queue kept getting run by this code and so sent out my whole quota of emails :/. Have I done something wrong with this code?

class QueueUpEmail(webapp.RequestHandler):
    def post(self):
        subscribers = Subscriber.all()
        subscribers.filter("verified =", True)

        last_cursor = memcache.get('daily_email_cursor')
        if last_cursor:
            subscribers.with_cursor(last_cursor)

        subs = subscribers.fetch(10)
        logging.debug("POST - subs count = %i" % len(subs))
        if len(subs) < 10:
            logging.debug("POST - Less than 10 subscribers in subs")
            # Subscribers left is less than 10, don't reschedule the task
            for sub in subs:
                task = taskqueue.Task(url='/admin/tasks/email', params={'email': sub.emailaddress, 'day': sub.day_no})
                task.add("email")
            memcache.delete('daily_email_cursor')
        else:
            logging.debug("POST - Greater than 10 subscibers left in subs - reschedule")
            # Subscribers is 10 or greater, reschedule
            for sub in subs:
                task = taskqueue.Task(url='/admin/tasks/email', params={'email': sub.emailaddress, 'day': sub.day_no})
                task.add("email")
            cursor = subscribers.cursor()
            memcache.set('daily_email_cursor', cursor)
            task = taskqueue.Task(url="/admin/tasks/queue", params={})
            task.add("queueup")