title: Firestore collection subscription pricing
body: <p>If I'm subscribing to a collection that has 1000 docs, will I bee charged for 1000 reads as soon as the subscription is initiated? Per <a href="https://firebase.google.com/docs/firestore/pricing#listens" rel="nofollow noreferrer">https://firebase.google.com/docs/firestore/pricing#listens</a> I'd say no, but per <a href="https://stackoverflow.com/a/60356400/9118098">https://stackoverflow.com/a/60356400/9118098</a> I'd say yes.</p>
  <p>I'm asking as I have an &quot;ever-growing&quot; calendarEvents collections, and am trying do decide whether it'd be better to structure data as</p>
  <p>calendarEvents/{calendarEventId}</p>
  <p>or</p>
  <p>calendarEvents/{2022}/March/{calendarEventId}</p>
  <p>to keep the cost down, as the latter allows me to subscribe to the current month only.</p>