Report on missing charge / discharge sessions

Unavailability of Tesla API or 4g connectivity to car sometimes means the whole drives or charging sessions are missed.  There is nothing we can do here from data collection point of view however we can report it better, especially charges.  Polling failures normally don't last too long so it may be fairly accurate to report before and after SOC values and extrapolate what happened when the car was not reachable.  This is especially useful for SuC I use that's underground and connectivity is often lost completely. I now have incomplete summary of charging and haven't got a good idea how many KWh I received.  At the very least it would help if I knew how many battery % points have I gained and lost.