public static function delete_data_for_user(approved_contextlist $contextlist) {
        global $DB;

        // Don't remove data from role_capabilities.
        // Because this data affects the whole Moodle, there are override capabilities.
        // Don't belong to the modifier user.

        // Remove data from role_assignments.
        if (empty($contextlist->count())) {
            return;
        }
        $userid = $contextlist->get_user()->id;
        $contextids = $contextlist->get_contextids();

        list($contextsql, $contextparams) = $DB->get_in_or_equal($contextids, SQL_PARAMS_NAMED);
        $params = ['userid' => $userid] + $contextparams;

        // Only delete the roles assignments where the user is assigned in all contexts.
        $DB->delete_records_select('role_assignments',
            "userid = :userid AND contextid {$contextsql}", $params);
    }