Yep, that could explain the symptoms. The accumulator for a given day and 
for a given observation is at times initialised from that particular day 
from that particular observation's daily summary table. If the sum field of 
the day and daily summary concerned was None instead of a numeric then the 
sum field of that accumulator would be initialised with None instead of 0.0 
and you would see the symptoms you experienced. Rebuilding the daily 
summaries would fix such a problem. It will be interesting to see if the 
same issue comes back, certainly if you were making changes to the database 
schema there is potential for a hiccup to occur, if you are relying on 
weeWX to handle all database interraction then such a hiccup should never 
occur.

Gary

On Sunday, 19 November 2017 11:23:03 UTC+10, Thomas Carlin wrote:
>
> I did a little more playing with this today, and determined that the 
> problem is with extraTemp3, which I just started using, but is built into 
> the system.  That being the case, I decided to drop and re-build the daily 
> summaries, just for fun.  My theory being that was done right before the 
> issue started occurring to add a battery voltage field, and there could 
> have been an issue there somehow.  It hasn't been running for too long yet, 
> but so far it seems to be working.  I'll keep an eye on it over the next 
> few days, and see how it does, and update the thread.
>
> Thanks,
>

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