TkSql and pg_group...

I noticed only today that postgreSQL 7.2 changed the structure of certain tables like pg_group, that now are no loger
editableby my tksql. The reason is that if TkSql cannot find any of:   1. primary key   2. unique not null   3. oid
switchesto read-only mode. 
 
 pg_group has only unique key and no oid so that for example you can enter several times a line like:  insert into
pg_group(grolist) values ('{27}');
 
 This is very strange to me, and I'd like to understand it better, moreover I'd like to understand how should an editor
copewith this case: I'd like to make tksql able to edit these tables too, but I see no way to act on a record in a
uniqueway.
 
 Thanks in advance sandro *:-)

-- 
Sandro Dentella  *:-)
e-mail: sandro.dentella@tin.it 
http://www.tksql.org                    TkSQL Home page - My GPL work