====== enable checksum after creation (initdb) ======

**Ubuntu 24.04 / postgres v16 with primary and secondary:**

 * shutdown primary and secondary

 * and - on both clusters:

<code>
sudo -u postgres /usr/lib/postgresql/16/bin/pg_checksums -P -e -D $PGDATA
</code>
 * Start the primary and secondary
 
 * And check if checksum is enabled on both (on):
 <code>
sudo -u postgres psql -c "show data_checksums"
</code>