#28: Event sourcing
Event sourcing is an alternative technique of storing business data. Rather than updating a single database record, every change is captured in an immutable, append-only log. We never overwrite existing data. Instead, we create and store an event that represents what exactly has changed. From the business perspective. In order to recreate the current state of an entity we must go through all the events and reconstruct it from history. Event sourcing brings better auditing and debugging. Also, storing changes can be faster because it requires inserting a new record rather than updating an existing one.
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