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Joan Leon
0ce0107f4f
#358 broadened the performance-optimization description to cover "frontend, backend, queries, and databases", but the body's backend coverage was a single N+1 example, against the full Core Web Vitals and art-direction treatment on the frontend side. Routing a "slow query" or "connection pool" prompt here landed on a snippet. Adds three measure-first patterns inline, each with a "when NOT to": - Query plans: read EXPLAIN ANALYZE before indexing; composite column order (equality first, then range/sort); the four cases where an index does not help; revert an index that did not change the plan. - Connection pool exhaustion: the distinctive symptom, one pool per process, why a bigger pool relocates the queue instead of removing it, and the proxy answer for serverless. - Caching: layer choice (in-process, shared, edge), key design as a correctness concern, one invalidation strategy rather than an accidental mix, and stampede protection. Deeper material goes to references/performance-checklist.md to keep SKILL.md readable: read/write patterns, negative caching, request coalescing, and query-plan, index, pooling and cache checklists. Closes #378 Claude-Session: https://claude.ai/code/session_01TuWNaEV9RFXpTxqeBRTRg8