protected static function get_nested_expiry_info_for_user($contextpath = '') : array {
        global $DB;

        $contextfields = \context_helper::get_preload_record_columns_sql('ctx');
        $expiredfields = expired_context::get_sql_fields('expiredctx', 'expiredctx');
        $purposefields = 'dpctx.purposeid';
        $userfields = 'u.lastaccess AS expirydate';
        $fields = implode(', ', ['ctx.id', $contextfields, $expiredfields, $userfields, $purposefields]);

        // We want all contexts at user-dependant levels.
        $parentpath = $DB->sql_concat('ctxuser.path', "'/%'");

        // This SQL query returns all user-dependant contexts (including the user context)
        // This is ordered by the context path in reverse order, which will give the child nodes before any parent node.
        $params = [
            'contextlevel' => CONTEXT_USER,
        ];
        $where = '';

        if (!empty($contextpath)) {
            $where = "AND ctx.path = :pathmatchexact";
            $params['pathmatchexact'] = $contextpath;
        }

        $sql = "SELECT $fields, u.deleted AS userdeleted
                  FROM {context} ctx
                  JOIN {user} u ON ctx.instanceid = u.id
             LEFT JOIN {tool_dataprivacy_ctxinstance} dpctx
                    ON dpctx.contextid = ctx.id
             LEFT JOIN {tool_dataprivacy_ctxexpired} expiredctx
                    ON ctx.id = expiredctx.contextid
                 WHERE ctx.contextlevel = :contextlevel {$where}
              ORDER BY ctx.path DESC";

        return self::get_nested_expiry_info_from_sql($sql, $params);
    }