{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null",
    "notifications": {
      ".indexOn": [
        "status"
      ]
    },
    "users": {
      "$uid": {
        "chats": {
          ".indexOn": [
            "lastUpdated"
          ]
        }
      }
    }
  }
}