To model time-variant data,you must create a new entity in a M:N relationship with the original entity.

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To model time-variant data, you typically add a new table to capture the changes over time, but it doesn't necessarily require a many-to-many (M:N) relationship. Instead, it often involves a one-to-many relationship where the new table records different states or versions of the data over time.

To Model Time-Variant Data,you Must Create a New Entity in a M:N