projection-patterns
Build read models and materialized views from event streams using projection patterns.
- Covers four projection types: live (real-time subscriptions), catchup (historical processing), persistent (with checkpointing), and inline (strong consistency)
- Includes five ready-to-use templates: basic projector framework, order summary projection, Elasticsearch search indexing, daily sales aggregation, and multi-table customer activity tracking
- Emphasizes idempotency, transactional consistency, checkpoint management, and safe rebuilding strategies
- Best practices section covers monitoring lag, error handling, event ordering, and denormalization patterns for query optimization
Projection Patterns
Comprehensive guide to building projections and read models for event-sourced systems.
When to Use This Skill
- Building CQRS read models
- Creating materialized views from events
- Optimizing query performance
- Implementing real-time dashboards
- Building search indexes from events
- Aggregating data across streams
Core Concepts
1. Projection Architecture
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