I was looking into python task queuing recently, here's some other choices from my notes:

https://github.com/malthe/pq - postgres queue based on rq and ruby queue_classic

https://github.com/coleifer/huey - sqlite, redis and in memory by coleifer (peewee creator). Possible to implement postgres storage layer simply.

https://github.com/closeio/tasktiger - flexible redis-based python task queue alternative to celery

https://dramatiq.io/ - actor based python job queue on redis/rabbitMQ