---
name: sickn33/projection-patterns
source: https://app.decimal.ai/s/sickn33-projection-patterns@1/SKILL.md
source_sha256: 18bdc87c9a27
---

# 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.

## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.