If comments in the database are encrypted, it'll be possible to have secret discussions that nobody, even the DB admin, can read unless they know the original U

If comments in the database are encrypted, it'll be possible to have secret discussions that nobody, even the DB admin, can read unless they know the original URL. And this can be done: just encrypt comments with SHA256(URL+salt). The admin will see that something is going on under a specific SHA1, but since there is no way to restore the URL, the admin will have no clue how to read the comments. It'll be pretty cool I think.