I think I would create a new table in the database and inport the spreadsheet data to it (unfortunately, I can't give you details on that, it's the kind of thing I have to figure out every time I need to do it, which isn't often). When that's done, I think you can use an SQL query to move the data to the user table. Of course there has to be some field that matches between the two tables - I'd assume there's a username, which hopefully stayed exactly the same after the move.
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