> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flowwarden.io/llms.txt
> Use this file to discover all available pages before exploring further.

# CQRS

> Build read-model projections from MongoDB Change Streams

<Note>This page is a placeholder. Full content coming soon.</Note>

## Overview

Use FlowWarden to maintain **read-model projections** in a CQRS architecture. Write to your command collection; FlowWarden listens to Change Streams and updates denormalized read views in real time.

```mermaid theme={null}
flowchart LR
    A[Command Service] -->|write| B[(Orders collection)]
    B -->|Change Stream| C[FlowWarden]
    C -->|project| D[(OrderSummary view)]
    E[Query Service] -->|read| D
```

## Why FlowWarden

* **Checkpointing** ensures no event is lost between restarts
* **Retry + DLQ** handles transient projection failures
* **Filtering** lets you react only to relevant operation types