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Preserve identity when changing a data model - Paper 4

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 O8 and another lesson X8 share title 'Reading'. Submission S8 points to O8; attempt A8 also points to O8. Replacement N8 has new teaching, not proven equivalent. Policy: archive O8 from current navigation, retain historical links, and do not alter X8. No real migration is requested.

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