Build read models and projections from event streams. Use when implementing CQRS read sides, building materialized views, or optimizing query performance in event-sourced systems.
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---
version: 4.1.0-fractal
name: projection-patterns
description: Build read models and projections from event streams. Use when implementing CQRS read sides, building materialized views, or optimizing query performance in event-sourced systems.
---
# Projection Patterns
Comprehensive guide to building projections and read models for event-sourced systems.
## Use this skill when
- 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
## Do not use this skill when
- The task is unrelated to projection patterns
- You need a different domain or tool outside this scope
## Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
- If detailed examples are required, open `resources/implementation-playbook.md`.
## Resources
- `resources/implementation-playbook.md` for detailed patterns and examples.
## 🧠 Knowledge Modules (Fractal Skills)
### 1. [implementation-playbook](./sub-skills/implementation-playbook.md)
