What I had originally imagined for recent downloads was something more like:

```json
{
    "foo": {
        "downloads": {
            "recent": {
                "20140129": 2,
                "20140128": 12,
                "20140127": 4,
                "20140126": 392,
                "20140125": 15,
                "20140124": 22,
                "20140123": 20
            }
        }
    }
}
```

I was thinking of this as a metric of extension activity (so that an extension that *was* popular a while ago may be considered differently today). I also figured that we'd just keep mostly-raw data in the registry and do whatever processing we want at presentation time.

What do you think?