I have had two devices registered for 3 years. Both showed up on the website. However, now, only one device shows up. The programs managed by that one device are a blend of the programs from my two devices.
Also, at one time, it was possible to adjust various parameters associated with my timers. For example, the precipitation characteristics that would trigger an automatic delay. Now, it seems there isn’t a page to adjust those parameters.
I would suggest that you use a test website for major overhauls and keep the primary website functioning.