I deleted my question from Stack Overflow having some sensitive information, but I believe the question is not completely removed from Stack Overflow. It also has a revision history, so I want to remove all the data related to it - snapshot everything. Could anyone properly help me to resolve this matter?
Mods can redact a revision - you should do a revision with no sensitive information, then do a custom flag asking for a redaction of all of the offending revisions.
Mods will see its redacted, but not the offending information.
Naturally, do this sparingly, and *do* sanitize your code *before* posting it to the public internet in future.