title: Is it possible for Firestore to send a notification to my app when a date that I saved as a timestamp in my database is approaching?
body: <p>I have an Android app where people are supposed to post events. Obviously, every event has a "date" field with Timestamp value. I would like Firestore to notify the user that posted the event 30 minutes before it's set date, even if the user's not using the app at that moment.</p>