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How I Made 140 Background Jobs Idempotent With Claude Code: 5 Lessons

This story is from 2026-10-15. It is preserved in the archive; the latest stories are on the live feed.

TL;DR A retried background job charged 37 customers twice, and that one incident sent me on a two-week audit of all 140 jobs in our Python/Celery stack. I used Claude Code to classify every job's side effects, add idempotency keys, and build a "run it twice" test harness. The AI was excellent at th…

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  1. 2026-10-15 14:31 · DEV Community — AI
    How I Made 140 Background Jobs Idempotent With Claude Code: 5 Lessons

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