The solution I have is a little more flexible than the Agile App as you can keep a permanent feed of the changes and they are applied correctly historically whenever you need a report.
I’ve enjoyed hacking away but have to confess that a mysterious thing has happened to my gas_kWh accumulator over the past two days which has kept me head-scratching. At first I thought I may have done something inadvertently with my code changes, but I’ve now come to the conclusion that I haven’t, (though I may be mistaken). I revived an old post with a similar problem to see if anyone has any ideas. I’d appreciate any thoughts on that