Why architecture matters here

Firestore fails on cost explosion + poor query design. Architecture matters because indexes + queries + rules compose.

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The architecture: every piece explained

The top strip is model. Collections + docs. Indexes. Queries. Realtime listeners.

The middle row is features. Security rules. Offline persistence. Transactions + batches. Multi-region.

The lower rows are ops. Pricing. Metrics. Ops — schema + capacity + governance.

Firestore — collections + documents + queries + realtime + security rulesserverless document DB with mobile SDKsCollections + docshierarchyIndexessingle + compositeQuerieswhere + orderBy + limitRealtime listenersonSnapshotSecurity rulesdeclarativeOffline persistencemobile cacheTransactions + batchesatomicMulti-regionreplicatedPricingreads + writes + storageMetricsusage + latencyOps — schema + capacity + governancegatesyncatomicreplicatebudgetwatchwatchoperateoperate
Firestore collections + documents + realtime listeners.
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End-to-end flow

End-to-end: mobile app writes a document. Security rules validate. Offline persistence caches. Realtime listeners on other clients get the snapshot. Composite index serves the ordered query. Multi-region replicates.