Why it matters

Event sourcing gives audit + time travel. Understanding shapes append-only architectures.

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The architecture

Every change is an event, appended to log.

State: fold over events.

Event sourcingEvents logappend-only truthAggregate statefold eventsSnapshotsfor perfSnapshots: periodic state save to avoid full replay; balance size + rebuild time
Event sourcing components.
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How it works end to end

Aggregates: entity that owns events.

Snapshots: cache at intervals to speed rebuild.

Migration: replay to rebuild new views.

Storage: Kafka, EventStoreDB, or DB with strict append.