extend INSERT by 'INSERT INTO table FETCH ... FROM cursor' syntax

Please CC me, I am not subscribed.

An imaginary SQL statement
INSERT INTO table FETCH ... FROM cursor;
looks almost the same as currently available
INSERT INTO table SELECT ...;

I tried it because I needed to insert a row in a table
after I DELETEd a set of rows, something like this:

BEGIN;
DECLARE total CURSOR
FOR SELECT
SUBSTR(datetime,1,7)||'-01 00:00:00' as month,
client,
SUM(money)
FROM stat
WHERE SUBSTR(datetime,1,7)='2003-10'
GROUP BY month,client;
DELETE FROM stat WHERE SUBSTR(datetime,1,7)='2003-10';
INSERT INTO stat FETCH ALL FROM total;
COMMIT;

but it does not work, chokes on FETCH ALL.

I want to sum up all the money by month, delete all the rows
(possibly thousands of them) and insert one row per client
with monthly totals.

Obviously I cannot swap order of INSERT and DELETE here.

I hesitate to post this to pgsql-hackers(at)postgresql(dot)org,
do I have to? ;)

--
Alexander Vlasenko