Thanks for your interest in Cayenne and the nice words.
We’re working on improving the capability of the “Download Chart Data” feature you see on the history charts for your widgets. Until then, have you tried the instructions for exporting Cayenne data found in these posts (which one to use depends on your device connectivity):
I know they are a bit of a pain compared to just clicking “download chart data”, but the steps inside should work and offer you more customizability when requesting your data. If you’d like, I’d be happy to extract data for you using these steps, if you PM me with your account credentials, and what widgets/time frame you’re looking for data from.