How about "Does the column make sense logically?" i.e. will the column take my BCNF table(s) and turn them into an unnormalized mess of redundancy and inconsistency?
This, of course, assumes that the database was designed properly in the first place.
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If most people are not willing to see the difficulty, this is mainly because, consciously or unconsciously, they assume that it will be they who will settle these questions for the others, and because they are convinced of their own capacity to do this. -Friedrich August von Hayek
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