text: CREATE TABLE IF NOT EXISTS `queue_tracks` (
    `index` INT NOT NULL COMMENT 'session内でのindex（0-indexed）（不変）',
    `uri` VARCHAR(255) NOT NULL COMMENT 'Spotify APIから返ってくるuri（不変）',
    `session_id` VARCHAR(255) CHARACTER SET 'utf8mb4' COLLATE 'utf8mb4_bin' NOT NULL,
    PRIMARY KEY (`session_id`, `index`),
    CONSTRAINT `tracks_session_id_fk`
      FOREIGN KEY (`session_id`)
      REFERENCES `sessions` (`id`)
      ON DELETE CASCADE
      ON UPDATE CASCADE)
  ENGINE = InnoDB;
  