How to implement Auditing automatically in EF Core?

Auditing tracks changes (who, what, when). It is automatically implemented by overriding SaveChanges/SaveChangesAsync or using an Interceptor.

You loop through the ChangeTracker for entities implementing an IAuditable interface. If the state is Added, you set CreatedAt and CreatedBy. If Modified, you set UpdatedAt and UpdatedBy. This ensures consistency without littering controllers with timestamp logic.