alter table fox_song
    alter column meta_prompt set default '';

alter table fox_song
    alter column meta_error_msg set default '';

alter table fox_song
    add meta_history varchar(1000) null after meta_error_type;

alter table fox_song
    add meta_concat_history varchar(1000) null after meta_history;

alter table fox_song
    add meta_type varchar(64) null after meta_concat_history;

alter table song_info
    modify lyrics varchar(8000) null;

alter table song_info
    add meta_type varchar(64) null;

alter table song_info
    add meta_source varchar(64) null;

alter table song_info
    add meta_history varchar(1000) null;

alter table song_info
    add meta_concat_history varchar(1000) null;