[cenkalti]

* Dalga stores jobs in a MySQL table which is handy if you are already using MySQL (backups, etc.)

* Dalga can schedule one-off jobs.

* Dalga has built-in retry mechanism.

[jerf]

A tight dependency on MySQL is somewhat limiting. Have you considered making that an interface with a default implementation that uses MySQL? It pretty much ought to be a mechanical transform where you simply extract all the places you touch MySQL into a method, then write an interface around that method.