Explain Event Sourcing architecture in PHP systems.

Event Sourcing stores every state change as an immutable event instead of persisting only the latest state.

Event Sourcing is an architectural pattern where the source of truth is a sequence of domain events rather than mutable database rows. Instead of updating records directly, applications append events such as OrderPlaced, PaymentConfirmed, or InventoryReserved to an event store.

The current state of an entity is reconstructed by replaying events in order. This approach provides complete auditability, temporal debugging, historical reconstruction, and easier implementation of CQRS.…