#SELECT (pg_stat_file('base/'||oid ||'/PG_VERSION')).modification, datname FROM pg_database;
      modification      |  datname
------------------------+------------
 2022-10-10 08:51:50+00 | template1
 2022-10-10 08:52:51+00 | opengauss
 2022-10-12 01:22:50+00 | db1
 2022-10-10 08:52:32+00 | template0
 2022-10-13 02:36:25+00 | tpcc_db
 2022-10-31 12:36:33+00 | blockchain
 2022-10-10 08:52:33+00 | postgres
(7 rows)