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When a site has the `must_approve_users` setting enabled, new user data is stored on the Reviewable model, including username, email, and any other data that is entered during signup. If the user is rejected, that data is retained, without a clear path to deleting it. In order to allow data that could be PII to be removed, without breaking Discourse's audit and logging trails, this change scrubs the PII from the relevant `ReviewableUser` and `UserHistory` objects, replacing that data with who scrubbed it, and why.