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Tests pass but the agent dropped a column: what a green diff can still contain

If you let Claude Code, Codex or Cursor write a migration, you've probably seen a PR that's all green: tests pass, CI is happy. Tests usually run against a fresh database, so they rarely notice a change that deletes data. A dropped column, a DELETE with no WHERE , or rm -rf $OUT_DIR/ can sit in a d…

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  1. 2026-11-14 10:19 · DEV Community — AI
    Tests pass but the agent dropped a column: what a green diff can still contain

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