Add lesson 37: MVCC and isolation#97
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Part of #6 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds MVCC and isolation (roadmap item
01-mvcc-and-isolation) — the new Module 9: Concurrency.Summary
How Postgres runs concurrent transactions correctly — row versions (xmin/xmax), snapshots, the read phenomena, and the four isolation levels.
Check
One
query-returnscheck (transfer-committed) — the learner runs a REPEATABLE READ transaction to known balances, verified by query-returns.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