Thanks for point it out, after a quick glance it actually looks like something I want to learn more about. Takes the niceties from prisma.io schema tooling and bring it closer to postgres.
I can tell you what I liked about it when I looked, and that's that it seems to allow you to easily encapsulate what your intent as a programmer creating a record to store data is, as well to query it that way. I imagine it obviates some of the reasons reach for ORMs for certain programmatic database needs.