celery task clean-up with DB backend

Question

I\'m trying to understand how and when tasks are cleaned up in celery. From looking at the task docs I see that:

Old results will be cleaned automatically

Answer 1

If you click on the link to the setting doc for CELERY_TASK_RESULT_EXPIRES:

http://docs.celeryproject.org/en/latest/userguide/configuration.html#result-expires

It does say that database supports this, but then you need to run celery beat (there's a default periodic task, called every day, to remove expired results).

The backend docs in the task should probably mention this as well, maybe there should be a dedicated guide for backends too. If you want to lobby for this, then please open up an issue at https://github.com/celery/celery/issues