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Preserve identity when changing a data model - Paper 3

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Invented records in tenant T: old lesson O7 and another lesson X7 share title 'Reading'. Submission S7 points to O7; attempt A7 also points to O7. Replacement N7 has new teaching, not proven equivalent. Policy: archive O7 from current navigation, retain historical links, and do not alter X7. No real migration is requested.

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