Comment by kippinsula

the atomicity is the whole game. we burned time on a Postgres+SQS setup where the enqueue happened in a trigger that fired before the commit was visible to other connections. added retry logic, then polling on the worker side, then eventually moved the enqueue inside the transaction. at that point you're basically reinventing what Honker does, just with more moving parts. the 'notification sent, row not committed' class of bug is usually silent and timing-dependent, which makes it brutal to track down.