CREATE USER su WITH SUPERUSER;
ERROR:  role "su" already exists
SET ROLE su;
CREATE EXTENSION pg_stat_monitor;
CREATE USER u1;
CREATE USER u2;
GRANT ALL ON SCHEMA public TO u1;
GRANT ALL ON SCHEMA public TO u2;
SET ROLE su;
SELECT pg_stat_monitor_reset();
 pg_stat_monitor_reset 
-----------------------
 
(1 row)

SET ROLE u1;
SELECT pg_stat_monitor_reset();
ERROR:  permission denied for function pg_stat_monitor_reset
CREATE TABLE t1 (a int);
SELECT * FROM t1;
 a 
---
(0 rows)

SET ROLE u2;
CREATE TABLE t2 (a int);
SELECT * FROM t2;
 a 
---
(0 rows)

DROP TABLE t2;
SET ROLE su;
DROP OWNED BY u2;
DROP USER u2;
SELECT username, query FROM pg_stat_monitor ORDER BY username, query COLLATE "C";
 username |              query              
----------+---------------------------------
 su       | DROP OWNED BY u2
 su       | DROP USER u2
 su       | SELECT pg_stat_monitor_reset()
 su       | SET ROLE su
 u1       | CREATE TABLE t1 (a int)
 u1       | SELECT * FROM t1
 u1       | SELECT pg_stat_monitor_reset();
 u1       | SET ROLE u1
 u2       | CREATE TABLE t2 (a int)
 u2       | DROP TABLE t2
 u2       | SELECT * FROM t2
 u2       | SET ROLE u2
(12 rows)

SELECT pg_stat_monitor_reset();
 pg_stat_monitor_reset 
-----------------------
 
(1 row)

DROP TABLE t1;
DROP OWNED BY u1;
DROP USER u1;
DROP EXTENSION pg_stat_monitor;
SET ROLE NONE;
DROP OWNED BY su;
DROP USER su;