firebaseでデータにアクセスできなくなったらやること

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {

    // This rule allows anyone on the internet to view, edit, and delete
    // all data in your Firestore database. It is useful for getting
    // started, but it is configured to expire after 30 days because it
    // leaves your app open to attackers. At that time, all client
    // requests to your Firestore database will be denied.
    //
    // Make sure to write security rules for your app before that time, or else
    // your app will lose access to your Firestore database
    match /{document=**} {
      allow read, write: if request.time < timestamp.date(2020, 7, 27);
    }
  }
}

      allow read, write: if request.time < timestamp.date(2020, 7, 27);

      allow read, write: if request.time < timestamp.date(2021, 7, 27);