Rails Sidekiq有点可怕啊

1. 无法根据redis来准确删除某个任务，隐藏的特别深，只能使用flushall

2. 网上的策略都不好使，例如：

https://stackoverflow.com/questions/25889699/sidekiq-stop-one-single-running-job
https://stackoverflow.com/questions/48348723/sidekiq-list-all-jobs-queued-running
https://stackoverflow.com/questions/12268008/how-to-find-and-kill-a-running-resque-job-on-rails

安装crontab:  apt install cron

不过sidekiq cron还是由ruby代码控制的，不是crontab -e 

3. 这里是具体的细节：  https://stackoverflow.com/questions/68866897/where-or-how-does-sidekiq-redis-store-an-object-when-a-job-is-retrying