0. https://www.cloudamqp.com/blog/why-is-a-database-not-the-rig...
EDIT>> I am not suggesting people build their own rabbitmq infrastructure. Use a cloud service. The article is informational only.
- No need to poll the database table
- No table-level locks and manual handling: row locks used for handling the work in progress
- "Manual cleanup" -- uhhh
Etc.