Update: I removed the random noise generator after someone showed me a better source of data. It turns out, robosats coordinators have an endpoint ("api/ticks") where they will tell you about each of the trades they did during a given month, including the amount traded, the currency pair, and the timestamp. So I modified my scraper to collect all of that info, produce "summary files" for every month, and a daily report based on those summary files.

Someone also sent me "historical" data from the original robosats coordinator who is no longer operative, but he (or a friend) was kind enough to send me a monthly report from his node for each of the months when he was active.

So the data is much better now, and I added a new "options" button where you can filter the data to only show info about specific currencies. I think it's pretty neat! And I also learned a lot about how to use the chart.js library in the process :D