Graph databases are much more powerful and a better fit for our modeling language. However, the platform can create a live SQL database mirror if you need that kind of thing.
Can you comment a bit more on what makes graph databases such a good fit for you? As far as I can see the models seem to fit pretty much 1:1 to a relational model?
I have experienced low-code platforms, and to me your approach looks very well thought-out! Veel succes ;)
One database runs one model (multiple databases can be connected to each other via interfaces). One transaction can update any number of properties, collections, etc.