Jaden Teng

This commit don't try to fix all not comfortable error process in this package. Ideally, we should use https://github.com/sirupsen/logrus package for log. Declare several type(or instance) of errors. Process all...

Is "Truly unique jobs" the responsibility of queue? I think it should be implemented through business tables(e.g. Add a unique index or a flag field to `orders` table). If referring...