database.rules.json

  {
    "rules": {
      "users": {
        "$user": {
          ".read" : "$user == auth.uid",
          ".write": "$user == auth.uid"
        }
      },
      "latest_feeds": {
          "$githubId": {
            ".read" : true,
            ".write": false
          }
      }
    }
  }