create table description_history_new(description varchar not null primary key, description_upper varchar, generation integer default 0);
insert into description_history_new(description, description_upper) select description, description_upper from description_history;
drop table description_history;
alter table description_history_new rename to description_history;
create table description_history_new(description varchar not null primary key, description_upper varchar, generation integer default 0);
insert into description_history_new(description, description_upper) select description, description_upper from description_history;
drop table description_history;
alter table description_history_new rename to description_history;