text: CREATE TABLE user_session(
    id SERIAL,
    turn smallint NOT NULL DEFAULT 0,
    hit smallint NOT NULL DEFAULT 0,
    answer character varying(40) NOT NULL DEFAULT '',
    answer_character_names character varying(250) NOT NULL DEFAULT '',
    result_summary character varying(250) NOT NULL DEFAULT '',
    expired_at timestamp with time zone NOT NULL,
    created_at timestamp with time zone DEFAULT now(),
    updated_at timestamp with time zone DEFAULT now(),
    PRIMARY KEY (id)
  );
  