It's definitely nice but feels too tightly coupled with the PHP+MySQL web stack, it's too big of a hurdle to install these two just for the purpose of storing some numbers and showing a simple HTML page with a javascript line graph.

Maybe consider:

- not storing the data in any database and instead fetching it through javascript when the page loads; sure it might take a couple of seconds to populate on first load but it's a small price to pay for the benefit of not requiring any database or server-side refetching cron jobs; most of the exchanges have publicly accessible APIs for fetching candles for every market.

- using a simple node.js express server to serve the (now practically static) HTML page