Just to contradict myself, I not opposed to adding a default of now in the database. I just think a null would be better for pre-existing ones, but if all of the upgraded ones have the same date, that would be a similar, though less obvious, clue.
Just to contradict myself, I not opposed to adding a default of now in the database. I just think a null would be better for pre-existing ones, but if all of the upgraded ones have the same date, that would be a similar, though less obvious, clue.