Nicely designed.

A couple of questions:

What exactly does "Refresh tables" do? It seems to add an arbitrary number to all the fields, which doesn't make sense.

What does "max rows" mean? And how do you get it to stick?
It always comes up as 100.

I too have been surprised at the size of "uploads"; for website viewing, they're about 1/10 the size of the downloads, can that be right?