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

        if (empty($contextlist->count())) {
            return;
        }

        $userid = $contextlist->get_user()->id;
        foreach ($contextlist->get_contexts() as $context) {
            if ($context instanceof \context_course) {
                $select = "itemid = :itemid AND userid = :userid AND type = :type";
                $params = [
                    'userid' => $userid,
                    'itemid' => $context->instanceid,
                    'type' => \backup::TYPE_1COURSE
                ];

                $DB->delete_records_select('backup_controllers', $select, $params);

                $params = [
                    'userid' => $userid,
                    'course' => $context->instanceid,
                    'type' => \backup::TYPE_1SECTION
                ];
                $sectionsql = "itemid IN (SELECT id FROM {course_sections} WHERE course = :course)";
                $select = $sectionsql . " AND userid = :userid AND type = :type";
                $DB->delete_records_select('backup_controllers', $select, $params);
            }
            if ($context instanceof \context_module) {
                list($usersql, $userparams) = $DB->get_in_or_equal($userlist->get_userids(), SQL_PARAMS_NAMED);
                $select = "itemid = :itemid AND userid = :userid AND type = :type";
                $params = [
                    'itemid' => $context->instanceid,
                    'userid' => $userid,
                    'type' => \backup::TYPE_1ACTIVITY
                ];

                $DB->delete_records_select('backup_controllers', $select, $params);
            }

        }
    }