Add lesson 38: Locking#98
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Part of #6 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds Locking (roadmap item
02-locking) — the new Module 9: Concurrency.Summary
Explicit locks in Postgres — SELECT … FOR UPDATE, the read-modify-write pattern, NOWAIT and SKIP LOCKED for job queues, and reading pg_locks.
Check
One
query-returnscheck (transfer-locked) — the learner performs a SELECT FOR UPDATE read-modify-write, 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