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mongodb-pro

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MongoDB modeling, aggregation pipelines, and operations — use when designing schemas or tuning Mongo queries.

skills/mongodb-pro/SKILL.md

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## Overview

MongoDB trades rigid schemas for flexible documents, which makes modeling choices
— embed vs reference — the central skill. This skill covers schema design,
aggregation pipelines, indexing, and the operational basics (replica sets,
transactions, backups).

## When to use

- Deciding whether to embed documents or reference across collections
- Writing aggregation pipelines (`$match`, `$group`, `$lookup`, `$unwind`)
- Creating compound, text, geospatial, or TTL indexes
- Debugging slow queries with `explain("executionStats")`
- Setting up replica sets, transactions, or change streams
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