<aside> 📚 📁 Category: Architecture

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Overview

Event Sourcing stores all changes as events instead of just current state. This provides complete audit trails, enables time travel, and supports rebuilding state from events.

<aside> ℹ️ Why It Matters: Understanding Event Sourcing is essential for building robust, scalable, and secure modern applications.

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Key Concepts

• [x] Events as Source of Truth - Immutable events
• [x] Event Store - Append-only storage
• [x] Event Replay - Rebuild state
• [x] Snapshots - Performance optimization
• [x] Aggregate Roots - Consistency boundaries
• [x] Event Versioning - Schema evolution
• [x] Time Travel - Query historical state
• [x] Command Sourcing - Store commands too

Common Use Cases

<aside> 💡 Where to Apply Event Sourcing

                        Financial systems
                        Audit trails
                        Collaborative editing
                        Regulatory compliance
                        Debugging and diagnostics
                        Analytics on historical data

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Best Practices

• [x] Make events immutable
• [x] Use snapshots for performance
• [x] Version events carefully
• [x] Keep events small