Thinking for future-proofing, calibrations may at some type be associated with both the device they came from (fingerstick BG meter) and the device they were used to calibrate (CGM). (Dexcom recommends always using the same fingerstick meter for calibration; knowing a user is *not* doing that could potentially be *very* valuable in terms of device usage.) Possibly CareLink already provides this info when calibrations come from the linked meter? Not sure.

Including the fingerstick device information will also be useful to avoid displaying duplicate readings when we're both reading in the Dexcom calibrations and the meter readings separately.