42 lines
1.4 KiB
Markdown
42 lines
1.4 KiB
Markdown
---
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name: projection-patterns
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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."
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risk: safe
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source: community
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date_added: "2026-02-27"
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---
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# Projection Patterns
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Comprehensive guide to building projections and read models for event-sourced systems.
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## Use this skill when
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- Building CQRS read models
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- Creating materialized views from events
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- Optimizing query performance
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- Implementing real-time dashboards
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- Building search indexes from events
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- Aggregating data across streams
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## Do not use this skill when
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- The task is unrelated to projection patterns
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- You need a different domain or tool outside this scope
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## Instructions
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- Clarify goals, constraints, and required inputs.
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- Apply relevant best practices and validate outcomes.
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- Provide actionable steps and verification.
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- If detailed examples are required, open `resources/implementation-playbook.md`.
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## Resources
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- `resources/implementation-playbook.md` for detailed patterns and examples.
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## Limitations
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- Use this skill only when the task clearly matches the scope described above.
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- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
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- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
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