security-rules.json

// These are your firebase security rules - put them in the "Security & Rules" tab of your database
{
  "rules": {
    // won't let people delete an existing room
    ".write": "!data.exists()",
    ".read": true,
    "$room": {
      // only the store owner can edit the data
      ".write":
        "auth != null && (!data.exists() || data.child('owner').val() === auth.uid)",
      ".read": true
    }
  }
}