此任务队列设置有什么问题?

我已经在为客户托管的站点上设置了此任务队列实现,它具有 cron job 每天早上2点开始 /admin/tasks/queue ,这会将要发送的电子邮件排队, /admin/tasks/email “和使用 cursors 以便小批量排队。因为某种原因昨晚 /管理/任务/队列 一直用这个代码运行,所以发送了我所有的电子邮件配额 :/ . 我对这个代码做了什么错误吗?

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")