On the other hand, I found this feature too difficult to use since the only way to get Postgre or MySQL is from an installation from sources (see https://documentation.wazuh.com/current/user-manual/manager/manual-database-output.html), since wazuh-packages repository does not support (on an easy way) setting custom flags, so I'll create an issue to simplify this.
Finally, IMO MariaDB will have no problem receiving data from wazuh-dbd daemon (responsible for sending alerts to the DB), but first, we need to solve the blocking issue.