Event Sourcing

Definitions

1. An architectural pattern where state changes are stored as an immutable sequence of events rather than just the current state. The current state is derived by replaying events, enabling complete audit trails and temporal queries.

   In plain English: Instead of saving just the current state, you save every change that ever happened, like a detailed history log.

   Example: "With event sourcing, we can reconstruct the exact state of any account at any point in time — invaluable for financial auditing."

Related Terms

• Webhook vs. Polling
• Event-Driven Architecture
• State
• State Machine
• Strangler Fig Pattern
• Hexagonal Architecture
• Init Container
• Data Lakehouse
• Slowly Changing Dimension
• Medallion Architecture
• Idempotent Pipeline
• Stream Processing
• API Gateway Pattern
• Pub/Sub
• CQRS
• Clean Architecture
• Backend for Frontend