Transaction Table Column Uses

Does anyone know what the Status column or the ExchangeID column are used for in the RMS Transaction table? I have a few hundred thousand transactions and none of them have a value other than 0 for either of these so I'm thinking they might not be used. I'm I safe to change them for my own uses?
More generally, does anyone have a list of the tables/columns and their uses? I know there are unused columns in the item table so it wouldn't surpise me if they were in other tables as well.
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