[T5] Performance tuning at scale

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Module: sql-trainer/curriculum/05-master/06-performance-at-scale.md
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Review checklist

• Technically accurate (claims true, examples correct)
• Clear & at the right level for the tier
• Persona voice — plain English first, code only when it helps
• Examples/diagrams produce the described result
• Dialect notes correct (where present)
• Practice/design prompts are sound and match the concept taught

Definition of done

Reviewed and either (a) approved with no changes, or (b) refined together until the problem and solution align.