Move DB schema to Python (SQLAlchemy)

[BrandonLMorris]

SQLAlchemy has the ability to define databases with metadata (here's the docs). If we could move all of the schema definition to Python, it would allow us to have a much more flexible database that can change with our application.

[BrandonLMorris]

I guess the real idea here is to have a written down definition of the database structure. Going this route will not facilitate migrations. We'll need something else for that.