Nice, that's very interesting and a commendable achievement!
If that is the case I would really like to see some internals of how the physics engine has been implemented in their pattern. I'm not asking for the rapier port source code, but it is hard to think in terms of a new advertised programming paradgim when there's no working examples.
For example I am very curious to see how a constraint solve is implemented in a SQL-like fashion. You would need various math operations and an efficient matrix representation off the top of my head, and I can't think of how that maps to a SQL-like interface.