Postgres is a great pub/sub & job server

If you need a publish/subscribe or job server at any point in your project, try using Postgres. It'll give you lots of data integrity and performance guarantees, and it doesn't require you or your team learning any new technology. If you're making any project of sufficient complexity, you'll need a publish/subscribe server to process events. This article will introduce you to Postgres, explain the

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PostgresだけでもPubSubサーバが出来て、それの利用例