hass-config/.storage/frontend.user_data_a7aaeb67e2194654b449b7f63b26e1ac

{
  "version": 1,
  "minor_version": 1,
  "key": "frontend.user_data_a7aaeb67e2194654b449b7f63b26e1ac",
  "data": {
    "language": {
      "language": "en",
      "number_format": "language",
      "time_format": "language",
      "date_format": "language",
      "time_zone": "local",
      "first_weekday": "language"
    },
    "core": {
      "showAdvanced": true
    }
  }
}