I could not find a relevant Meta question for this issue.
I've come across a couple of questions where someone copy and pastes their code, url, etc and it contains personal information they most certainly did not intend to share. This could be a google key, token, or password.
As editors we can go through and remove this for them but because of the nature of the site it maintains a history. Is there any talk of a way to vote that a piece of history be permanently removed? Or at least have the ability for Moderators to remove the history.