--
-- timespan__interval_delete/2
--
create or replace function timespan__interval_delete(
  integer,
  integer
) returns int4 as $$

declare
       interval_delete__timespan_id   alias for $1;
       interval_delete__interval_id   alias for $2;
begin

       delete from timespans
       where timespan_id = interval_delete__timespan_id
       and   interval_id = interval_delete__interval_id;

       return 0;

end;$$ language plpgsql;