@DLane You made a good point regarding extensive outages. I do have a several UPS units on critical circuits, to avoid short term network outages, plus a whole house generator, to prevent extended ones, and hopefully I didn't encounter the PWS scenario you described due to power loss. I really don't know how long the Netatmo was not sending data via Meteoware to PWS and ultimately to Rachio - it could have been months, especially with the Rachio paused through the winter months. It isn't something that I expected to happen. Now that this occurred, I'll be watching it daily to make sure everything continues to work properly. Of course, I won't be able to check it every several hours to avoid the possibility of PWS resetting, but I should be able to act to prevent the Rachio from running any wasteful watering cycles in the future, while the PWS history is built again.
@mckynzee It's unfortunate that PWS apparently doesn't pull out prior history from the Netatmo. Since I recycled the Netatmo yesterday, I do now see continuing data in PWS today, and it is building a new history from the restoral point. I can understand how it would be much more difficult for PWS to extract preceding historical data from a variety of sources, with different structures, and I doubt that could be changed.
The reason that I most suspect the Netatmo unit as the problem, is that it has a slightly checkered history. There were times over the last couple of years when it would fail to report within the Netatmo app data path for extended periods, and only a power recycle would restore full operation. Ironically, I haven't seen that problem for at least 10 months, and I was hopeful that any instability was gone. This problem is a bit different, since it only affected the Meteoware/PWS/Rachio pathway, but similar in that once the data stops, it doesn't start up again without a kick from me. I'll watch carefully, and report back if it occurs again.