Gonna toss my own hat in the ring there for the python+postgres ecosystem :)

https://github.com/tktech/chancy

> As a rule of thumb, if you're processing less than 1000 jobs per day or your jobs are mostly lightweight operations (like sending emails or updating records), you can stick with this solution.

This seems... excessively low? Chancy is on the heavier side and happily does many millions of jobs per day. Postgres has no issue with such low throughput, even on resource constrained systems (think a $5 vps). Maybe they meant 1000 per second?