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Build a database in Rust: AI passed 866K tests, then failed ROLLBACK

This story is from 2026-10-18. It is preserved in the archive; the latest stories are on the live feed.

Originally published at tensorust.com . TL;DR: One headless Claude Code session (Opus 5.5) wrote a SQL database engine in Rust, standard library only, in 12.5 minutes : 4,191 lines that pass all 11,185 records of the SQLite test files it was graded on. Today I ran it on 866,331 records from 95 test…

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  1. 2026-10-18 17:27 · DEV Community — AI
    Build a database in Rust: AI passed 866K tests, then failed ROLLBACK

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