Your signature is too long, try to shorten it 
That would be a serious flaw in the forum code. User input should always be verified before passing to a SQL query. Unfortunately the forum code is very, very old so nothing can be done about that.Just checked the input form. You could enter a whole book in the textarea
Of course that can't be stored in the database, the textarea should have limited the number of characters to what can be stored.
... Checking the page source confirms the flaw: the textarea is missing
maxlength="??"----------------------------------------
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