Developer builds tool that logs bug fixes and flags repeated mistakes before commit

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The author notes that the same credential-leak bug in the Python requests library was fixed in 2014 and again in 2023, because the lesson was buried in git history. Similar redirect-credential bugs have been fixed at least 47 times across 22 projects since 2014. To counter this, the author built Bug Diary, a local tool that automatically writes post-mortems for fix commits using Gemma 4 and checks new changes against past lessons. It runs entirely on a laptop with Ollama and a SQLite file, and a demo shows it catching a repeated race condition in a separate project's token refresh code.

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