https://book.hacktricks.xyz/pentesting-web/sql-injection/postgresql-injection/rce-with-postgresql-extensions
https://ftp.postgresql.org/pub/source/v10.12/ (Manually Install)
sudo gcc -I$(/usr/local/pgsql/bin/pg_config --includedir-server) -shared -fPIC -o pg_exec.so pg_exec.c