insert into pg_attribute select attrelid, 'conincluding', atttypid, attstattarget, attlen, 25, attndims, attcacheoff, atttypmod, attbyval, attstorage, attalign, attnotnull, atthasdef, attisdropped, attislocal, attinhcount, attcollation, attacl, attoptions, attfdwoptions from pg_attribute where attrelid = 'pg_constraint'::regclass::oid and attname ='conkey';

select relnatts=25 from pg_class where relname='pg_constraint';