A pre-made one? Not that I know of. For the post edits, I think you can check the postedithistory table to see if the postid is in there. But, I don't think there is anything you can do regarding the signature - I'm pretty sure nothing is saved regarding edit history of the signatures.
If you are wanting to keep track of when a user edits their signature, I think you will have to write some code for that and it may include adding a column to the database for the edit date.
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