cziehr
You're right, it's important to mention that history will be lost when deleting data/attic
!
But since attic (as far as I know) does not contain the most recent version, I assumed that a user deleting the page (and thus losing the most recent version) doesn't care too much about older versions.
Another idea (if keeping data is important): I don't know if the search index respects user permissions. Does the search show pages I don't have access rights? If not, the namespace in question could be restricted so that users won't see its contents within their searches.