The SolarEdge "site inventory" API gives a list of the current devices installed, but they also have a "equipment change log" API that, given an existing device ID, will list  out old devices that the current one replaced. Those replaced device IDs should be added to the references returned from the /data-values API.

The "current device" ID should be included as metadata on the "replaced" devices, so users of the API can associate them together appropriately.