OK there are pros and cons about this issue. Now, is there any chance of achieving anything if we keep the signatures? If there is, if we KNOW how we could acomplish that, then I say keep the signatures. If not, we could STORE then somewhere and remove that feature from the website. Of course, Jay's got the final word.

About the SQL commands I said, it's basically like that: (free SQL lesson everyone!)

DELETE FROM SIGNATURES - will delete every row from a table called signatures, asuming the signatures are stored in a table called that
COMMIT - will confirm the operation and effectively delete those rows
DROP TABLE SIGNATURES - will remove that table from the database

(Always perform a delete before the drop, so you can be sure it won't have any impact on stored procedures or something like that)