Someone pmd us asking why h2.

h2 is our first choice due to it's small footprint and ease of portability, but we can switch to another database at any time. We will be testing different database technologies before the initial launch to see which one will be best for our case. That's one of the reasons we are pushing hibernate next, we can change the database type without changing our code. Everything will be tested, clean, refactored and modular.

As of a few minutes ago we got hibernate to work with the ide and appears to be functional.

For the mined blocks, its a bug we already fixed but didn't push out yet. It wasn't transmitting information across the network yet. And yes placeholder is correct it isnt optimized yet.