text: CREATE TABLE IF NOT EXISTS todo (
    id BIGINT(20) NOT NULL AUTO_INCREMENT,
    thing VARCHAR(50),
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    modified_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    todo_status ENUM ('DONE', 'WAIT') DEFAULT 'WAIT',
    PRIMARY KEY (id)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
  
  CREATE TABLE IF NOT EXISTS tag (
    id BIGINT NOT NULL AUTO_INCREMENT,
    name VARCHAR(5),
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    modified_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY (name)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
  
  CREATE TABLE IF NOT EXISTS todo_tags (
    todo_id BIGINT NOT NULL,
    tag_id BIGINT NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_todo_id (todo_id),
    INDEX idx_tag_id (tag_id)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;