LOAD 'pg_savior';
CREATE EXTENSION pg_savior;
SELECT count(*) AS installed FROM pg_extension WHERE extname = 'pg_savior';
 installed 
-----------
         1
(1 row)

SHOW pg_savior.enabled;
 pg_savior.enabled 
-------------------
 on
(1 row)

SHOW pg_savior.bypass;
 pg_savior.bypass 
------------------
 off
(1 row)