The line chart is great, but if you have many (>10-15) points, it gets far too busy for the small screen of a phone.
The ability to show the ‘last x results’ would be helpful. At the moment, if you sort oldest to newest (with date along the x), and only ask for 10 results, you (correctly) get the first (oldest) 10.
In most use cases I can think of, however, it’s probably the last (most recent) 10 which are the most useful…
Currently if you flip the order as new-old, it (correctly) flips the chart horizontally, so doesn’t actually help.