We no longer hard delete revisions. Instead, we now redact them.
And currently, moderators have that ability too. So instead of contacting us if you for some reason accidentally posted sensitive information, please proceed by editing your post to have said information removed and replaced with dummy text/data/code that fulfills the same purpose — take care not to break context of the post, especially if answers are already present — and then flag the post for moderator attention. In both the flag and the edit descriptions, please try to be as descriptive as possible (p.e., mention "removed IP and e-mail addresses" or "removed e-mail address and password").
If the answers already used sensitive information before you noticed and edited it out, please do the same thing for them.