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Overview
Given that most of our consumers implicitly depend on the ordering of the messages, this patch drops the retry queues and adds a simple DLQ solution.
The balance worker ignores any messages (e.g. ingest) coming after an entitlement deletion, but we are relying on the ordering there.
The notification worker relies on per-subject ordering so that it can check the database for previously sent alerts. Right now, out-of-order snapshots might trigger false notifications. (We can work around that.)
OSS-54