event-sourcing
Event Sourcing Patterns
Store application state as immutable events rather than current state snapshots.
Overview
- Full audit trail requirements (compliance, finance)
- Temporal queries ("what was state at time X?")
- CQRS implementations with separate read/write models
- Systems requiring event replay and debugging
- Microservices with eventual consistency
Quick Reference
Domain Event Base
from pydantic import BaseModel, Field
from datetime import datetime, timezone
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