I made the decision not to try to store/retain my own data, partially because many of my sources, my power utility, my thermostats, Sense and my solar provider all supply hourly export (or even finer granularity). When I do want to see at tighter resolution, I do use the APIs, plus @duanetiemann’s utility for HS110’s.
And just for a little fun, the existing Sense Power Meter waveforms can be harvested from the web app for limited analysis, like this…