SQL Maxis: Why We Ditched RabbitMQ And Replaced It With A Postgres Queue

We recently ripped out RabbitMQ from our system and replaced it with a queue built on top of our Postgres db and written in SQL. The change took half a day to implement + test, and had a net delta of -580 LOC. Much more importantly, it drastically improved the reliability and resiliency of our system. This is a writeup of that change, the rationale behind it, and how we did it. Note: this is not a