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Preserve identity when changing a data model - Online practice 1

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 O1 and another lesson X1 share title 'Reading'. Submission S1 points to O1; attempt A1 also points to O1. Replacement N1 has new teaching, not proven equivalent. Policy: archive O1 from current navigation, retain historical links, and do not alter X1. No real migration is requested.

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