I've been tasked with pulling together client history (location, etc.) to pre-load data into a visualization and have been experimenting with the client history API calls. There is a LOT of data (gigabytes worth) that I just don't need in the client history, so was thinking the compact history would be better. However, it doesn't seem to have a timestamp (i.e., lastLocatedTime). This compact location history without a time reference isn't much use, so is there something I can use to time order the data? What is the meaning of the numeric value in the "chgOn" field?