Add lesson: transactions basics#17
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Covers BEGIN/COMMIT/ROLLBACK with the canonical account-transfer example, the aborted-transaction state after a statement error, the BEGIN…ROLLBACK dry-run pattern, and SAVEPOINT/ROLLBACK TO SAVEPOINT for partial rollback. Closes with a "how long should a transaction be" rule-of-thumb section. Part of #6. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
08-transactions-basics(module-relative04-transactions-basics).BEGIN/COMMIT/ROLLBACK, the aborted-transaction state after a statement error, theBEGIN…ROLLBACKdry-run pattern, andSAVEPOINT/ROLLBACK TO SAVEPOINTfor partial rollback. Closes with a rule-of-thumb section on transaction length.Note: this PR uses module-relative slot
04-assuming #15 and #16 land first. The validator allows gaps, so this is mergeable independently.Part of #6.
Test plan
npm run lessons:validatenpx tsc --noEmitnpm run lint/lessons/08-transactions-basics/preview— confirm the SAVEPOINT example produces Linus at 106 and the aborted-tx example leaves Ada's balance unchanged🤖 Generated with Claude Code