Hi John,
Thank you very much! It not the best news 
I think in the state of my application and website it is easier to migrate everything to postgresql. I don’t need professional management for it just possibility to create databases, I can do it with pgAdmin on my desktop computer. I installed pgsql to my dev vps and it is very ease to move data to there. It looks like nothing special needed, I think it will work next to InterWorx. So the domain, emails will be managed with InterWorx but in the background will run pgsql.