How to remove user specific grant and revoke

User groups table is defined as

     CREATE TABLE IF NOT EXISTS public.kaspriv
     (
         id serial primary key,
         user character(10) NOT NULL,
         group character(35) NOT NULL
     ...
     )

There are hundreds of users. Earlier time grant and revoke commands were 
executed for every user separately. Later revoke and grant commands for 
public were added:

     REVOKE ALL ON TABLE public.kaspriv FROM PUBLIC;
     GRANT SELECT ON TABLE public.kaspriv TO PUBLIC;

pgAdmin SQL tab still shows revoke and grant commands for every user also:

     REVOKE ALL ON TABLE public.kaspriv FROM PUBLIC;
     REVOKE ALL ON TABLE public.kaspriv FROM someuser;
     REVOKE ALL ON TABLE public.kaspriv FROM someotheruser;
     ...
     GRANT SELECT ON TABLE public.kaspriv TO PUBLIC;
     GRANT SELECT ON TABLE public.kaspriv TO someuser;
     GRANT SELECT ON TABLE public.kaspriv TO someother;
     ...

How to remove those unnecessary user-specific GRANT and REVOKE commands 
to make rights cleaner? pgAdmin does not have delete option for those.

Something like

     DROP REVOKE ALL ON TABLE public.kaspriv FROM all EXCEPT public;
     DROP GRANT SELECT ON TABLE public.kaspriv FROM all EXCEPT public;

This will be one-time action. It can be done manually in pgadmin or 
using some script running once.

Using

     PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu,
     compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit

and latest pgAdmin 7.2

Posted also in 
https://stackoverflow.com/questions/76394896/how-to-remove-unnecessary-grant-and-revoke-privileges-from-table

Andrus.