I added
history:
purge_days: 7
and I get
homeassistant.bootstrap: Invalid config for [history]: [purge_days] is an invalid option for [history]. Check: history->history->purge_days. (See C:\Users\dauth\AppData\Roaming.homeassistant\configuration.yaml:190). Please check the docs at https://home-assistant.io/components/history/