We mainly use PostgreSQL for production, hsqldb for development.
But on other software, we have a few customers with Oracle or SQL Server, so in the futur we will be interested by other DBMS…
Right now, we’d be happy to use PostGIS, but for now Jmix creates geometry in text datatype with WKT data, not as a PostGIS datatype.
there is maybe a solution with geolatte or geotools