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How I Ran a Zero-Downtime Postgres Migration on a 180M-Row Table With Claude Code

This story is from 2026-10-10. It is preserved in the archive; the latest stories are on the live feed.

TL;DR Our events table was about to hit the 2,147,483,647 ceiling on its int4 primary key, and it had 180 million rows and zero tolerance for downtime. I used Claude Code to plan and write an expand/contract migration to bigint that ran over 9 days with no locked writes. The agent was a fantastic c…

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  1. 2026-10-10 14:31 · DEV Community — AI
    How I Ran a Zero-Downtime Postgres Migration on a 180M-Row Table With Claude Code

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