Upfront my question actually does not involve a nethserver-module…
Some non nethserver applications do not work with the stock mariadb or start to complain about it, Newer Gittea versions won’t work ( Specified key was too long ), my non-nethserver mail setup starts to throw warnings.
Each project has its requirement based I think on the knowledge of the lead developer, so install the three known databases, sqlite, mariadb and postgresql, but you will miss all other *SQL
really old, I tend now to go to the scl, normally available on my repository for mariadb and officially for postgresql 12 in NS project
we tend to say it is not done for huge and insane access, however it is the database of fail2ban
the concern with postgresql is that it is not incorporated inside the official backup of NS, you have to think on it. after all you have on my repo the equivalent phpmyadmin for postgresql