How to delete or move old data from inputs

I said the same thing yesterday:

I also said I already have a basic graphing infrastructure set up. I want to import the new IoTaWatt data into my existing system, not install a bunch of new databases and packages and dependencies and then have to port my whole existing system to use the new stuff that I then have to learn. Yes, I may make that leap some day, but not today. All I want is the data out of IoTaWatt as efficiently as possible.

I’ve used the query API via wget to overlay IoTaWatt data records onto my existing graphs. My next step is to figure out one of the Data Uploader protocols so that I can keep my own historical log and use the data from that without loading down IoTaWatt with a query on every graph.