I’m pretty sure that there is not such feature.. And @admin has told that there is no space left for more code in the meter, so probably no new features anymore, or at least it would be very difficult.

Phone-app has almost no restrictions for growing, but in my opinion, long time energy measurements would have to go through logging. Which is not that much of a deal, as we now have ability to transfer logs over bluetooth. So it should be possible, now we only need someone willing to write that code, as app:s are open source.