public static function duplicate_map(string $source_type, int $source_id, string $dest_type, int $dest_id): void
    {
        if ($source_id > 0 && $dest_id > 0) {
            debug_event(__CLASS__, "duplicate_map " . $source_type . " {" . $source_id . "} => " . $dest_type . " {" . $dest_id . "}", 5);
            $sql        = "SELECT `object_count`.`date`, `object_count`.`user`, `object_count`.`agent`, `object_count`.`geo_latitude`, `object_count`.`geo_longitude`, `object_count`.`geo_name`, `object_count`.`count_type` FROM `object_count` WHERE `object_count`.`count_type` = 'stream' AND `object_count`.`object_type` = ? AND `object_count`.`object_id` = ?;";