Is it necessary to obtain the OldValue and NewValue of a property in an Audit entity each time, even when the entity has undergone changes?

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Yes, it is necessary to obtain the OldValue and NewValue of a property in an Audit entity each time there are changes to the entity. This is important for tracking the history of changes made to the entity, and for future reference in case any discrepancies or issues arise. Without storing the OldValue and NewValue, it would be difficult to determine when and how changes were made to the entity.