Just how persistent are Firebase database observers?
<p>I decided to run a test on the XCode iOS simulator to see if an observer to a location in the Firebase database would continue to fire even when the app is in the background. Turns out it does, but I am wondering if this is indefinite until the app terminates or if it will actually stop after some time. It's been a very long time and the observers still fires whenever I manually update the value in the database that the observer is looking at. Also note that I don't have any background modes enabled in my app's capabilities, so it seems that the observer can persist in background mode despite no explicit background modes of any kind. </p>

<p>On the one hand I am very glad that the observer stays on in background as this is helpful to me, but I am a bit anxious to know why this is allowed to happen as iPhone is generally quite conservative by default when it comes to doing stuff in the background.</p>