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Offset paging looks fine in a Firestore demo, but it bills for skipped documents and breaks under data changes. Cursor queries with startAfter keep infinite-scroll feeds proportional to page size—if you choose a stable sort key.
A practical decision guide comparing Firebase Realtime Database and Cloud Firestore across data model, query capabilities, scaling, pricing, and a concrete presence-system implementation in both.
Choosing between Firebase Realtime Database and Cloud Firestore comes down to data shape, query needs, and billing drivers. This guide compares both and shows how to validate the choice with emulators and a load test.
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