Restore narrative to Primary Key chapter #44
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Add four sections from earlier version to enhance the chapter: - Opening hook with real-world impact examples (HR/dentist scenarios) - Historical SSN example with critical thinking questions and links - Real-world identification standards callout (VIN, RFID, aircraft) - University student database example alongside lab mouse example
- Move Default Values chapter after Primary Key (017 → 019) - Expand "Explicitly Defined Keys" admonition to comprehensive explanation of why DataJoint prohibits default values in primary key attributes - Add cross-reference warning in Default Values chapter - Simplify duplicate warning in Decision Framework section - Document client-side surrogate key alternatives (UUID, ULID, NANOID)
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