Take a look at the thermometer/hydrometer from SwitchBot (also available on Amazon). $14 each, but available in packs of 2/4 at a discount.
Nearly all SB products seem to have data export from the app. I have three temp sensors (inside/outside/garage), and also use the smart plug mini to monitor and store power consumption data for devices.
Yep, seeing that with my deck and HoloISO desktop right now. Best advice is probably to avoid restarting, and potentially switch to offline mode if you're still logged in.