e.g : 1. last vist time statistic ... 2. log ... 3. send emails .. seems [rihanna](https://github.com/samphilipd/rihanna) is the best tool, not need redis and most powerful pkg: [exq](https://github.com/akira/exq)
e.g :
seems rihanna is the best tool, not need redis
and most powerful pkg: exq