Originally published at hafiz.dev

I changed a post title to "Q4 pricing update", got the green "Saved" banner, and the heading right under it still said "Q3 pricing update". The debug line on the same page said the request had read from the primary. That was Laravel 13.38.0, with the new PreventStaleDatabaseReads middleware installed exactly the way the docs show it.

The middleware is a good idea. Jack Bayliss wrote it after seeing his replicas lag 0 to 1 seconds on average and up to 15 seconds under some workloads. That's long enough for a user to edit a title, refresh, see the old one, and file a bug report. It shipped in v13.38.0 on 20 October.

To see what it covers, I set up a MySQL 8.4 primary and a replica in Docker, held the replica 5 seconds behind with delayed replication ( SOURCE_DELAY=5 ), and pointed a clean Laravel 13.38.0 project at both. Five seconds is slow for a healthy replica. That's the point. It makes every gap reproducible on a laptop.…