about “skippable” instructions between setcc and test. In particular, it
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Redis/RabbitMQ for job queues. Postgres can be a perfectly fine job queue. SELECT ... FOR UPDATE SKIP LOCKED gives you a reliable, transactional work queue without adding another service to your stack. Sequin has a great writeup on building your own SQS or Kafka with Postgres if you want to see how far you can push this.