投稿者情報追加（#17） (#18)

#17

#17

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #18

migrations/2026_03_05_122300_add_user_id_to_videos.sql

@@ -0,0 +1,3 @@
+ALTER TABLE `videos` ADD `user_id` BIGINT NULL DEFAULT NULL COMMENT 'ユーザ Id.' AFTER `code`;
+ALTER TABLE `videos` ADD INDEX(`user_id`);
+ALTER TABLE `videos` ADD FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;