Add lesson 43: Capstone: troubleshooting a slow query#103
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Part of #6 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds Capstone: troubleshooting a slow query (roadmap item
04-capstone-troubleshooting) — the new Module 10: Expert & operations.Summary
Diagnose a slow query end to end — measure with EXPLAIN ANALYZE, read the plan, add the right index, and confirm it flipped.
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One
query-returnscheck (orders-customer-index-added) — the learner adds the fixing index after diagnosing with EXPLAIN ANALYZE, verified via pg_indexes.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