Contained instructions on how to recover your old config from the ESP8266 SPIFFS. That may be gone now if you created a new one, but take a look.
Your unit is now getting an exception while handling a query. This has happened before with Home Assistant and a brand new datalog. If you have HA, please stop the IoTaWatt integration and see if the IoTaWatt stops restarting. If so, wait a few hours before restarting the HA integration and it should be OK.