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Two writers, one database: why your self-hosted app breaks the moment it runs twice

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

I keep running into the same failure in the self-hosted world, and it took me an embarrassingly long time to name it the first time round. The app works fine as one container. You add a second replica, or a second backend process, and everything goes strange: logins stop sticking, requests hang, or…

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  1. 2026-09-11 17:09 · DEV Community — AI
    Two writers, one database: why your self-hosted app breaks the moment it runs twice

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