alter table work_checkin
  add column if not exists biz_type varchar(20);

alter table work_checkin
  add column if not exists biz_id bigint;

alter table work_checkin
  add column if not exists biz_name varchar(200);

alter table work_checkin
  add column if not exists user_name varchar(100);

alter table work_checkin
  add column if not exists dept_name varchar(200);

do $$
begin
  if not exists (
    select 1
    from pg_constraint
    where conrelid = 'work_checkin'::regclass
      and conname = 'work_checkin_biz_type_check'
  ) then
    alter table work_checkin
      add constraint work_checkin_biz_type_check
      check (biz_type is null or biz_type in ('sales', 'channel', 'opportunity'));
  end if;
end $$;