February 12, 2026 tl;dr I tasked Claude, Codex, and Gemini to build a SQLite-like engine in Rust. ~19k~ lines of code. Parser, planner, volcano executor, pager, b+trees, wal, recovery, joins, aggregates, indexing, transaction semantics, grouped aggregates, and stats-aware planning all implemented. 282 unit tests, all passing. background Treat software engineering like distributed systems, and force coordination...