Review policy for retrying and expiration of the tasks
Tasks taking a few hours to complete indicate a probable problem, so we need a mechanism to restart the task or flag somehow the issue. For example, we could:
- set expiration for tasks: https://docs.celeryproject.org/en/stable/userguide/calling.html#expiration
- define retry policy: https://docs.celeryproject.org/en/stable/userguide/calling.html#retry-policy