alter table site_aggregates 
  drop column users_active_day,
  drop column users_active_week,
  drop column users_active_month,
  drop column users_active_half_year;

alter table community_aggregates 
  drop column users_active_day,
  drop column users_active_week,
  drop column users_active_month,
  drop column users_active_half_year;

drop function site_aggregates_activity(i text);
drop function community_aggregates_activity(i text);