alter table mv_info
    alter column status set default 0;

alter table mv_info
    add timeout_at datetime null after status;

alter table mv_info
    add read_status int default 0 not null after timeout_at;

alter table mv_info
    add update_time datetime null after create_time;

alter table mv_generate_log
    add audio_url varchar(255) null after song_id;