random_user_set — Clustered. Stores data about entries for the random user search. On posting an entry (public, to personal journal, and not opted out (using latest_optout option at the console)) a user may end up with a row in this table. The htdocs/random.bml page returns a random user that is both 1) publicly listed in the directory, and 2) updated within the past 24 hours. If a user changes their privacy setting using the console to not be in this table, it will take up to 24 hours for them to be removed from the random.bml listing; a maintenance task builds/cleans the table. The information row is kept for seven days by default. Site administrators can adjust this using the $LJ::RANDOM_USER_PERIOD site variable.