Add lesson 39: Deadlocks#99
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Part of #6 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds Deadlocks (roadmap item
03-deadlocks) — the new Module 9: Concurrency.Summary
Why two transactions can freeze each other, how Postgres detects and breaks the tie, and the ordering discipline that prevents it.
Check
One
query-returnscheck (consistent-order-transfer) — the learner does a consistent-lock-order transfer (the avoidance technique), verified by the resulting balances.Verified end-to-end against a non-superuser Postgres 16.
npm run lessons:validate(34/34) andnext buildboth pass.Part of #6
🤖 Generated with Claude Code