If you find any code that's called TDB or TDB2, I think, this one was the second version of the Thing DB that I wrote at some point, this is what it's referring to, instead of having a table that looked like this--a link table with a bunch of different columns on it for different things--we would instead do something like this, we would have a table that just had a couple of properties on it, a couple of properties that everything had. 