NOTE
Event Sourcing
Persisting domain changes as an append-only event history and rebuilding state through replay/projections.
This is a historical learning note and may contain outdated or incomplete understanding.
Event sourcing stores the authoritative history of state changes as immutable domain events instead of only overwriting the latest state. Current views are rebuilt or projected from that history.
It provides auditability and replay, but introduces schema evolution, projection rebuilds, idempotency, ordering, storage growth, and operational complexity. It is not the same as merely publishing events after updating a normal database. Use it when the history itself has strong business value.