How to add a NOT NULL column to a large table safely in Rails
A migration that runs in two milliseconds on your laptop can lock a production table for thirty seconds and pile up every request behind it. The gap i…
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Recovering a status page from a half-finished schema migration
The log line was 'database schema version 23 found, expected 21' and the pod exited immediately after printing it. The team had already tried a Helm r…