> ## 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.

# Cache Invalidation

> Invalidate caches in real time across all instances

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

## Overview

Use FlowWarden to broadcast cache invalidation events to every running instance of your application.

```mermaid theme={null}
flowchart TD
    A[(MongoDB)] -->|Change Stream| B[FlowWarden]
    B --> C[Instance 1 — evict cache]
    B --> D[Instance 2 — evict cache]
    B --> E[Instance N — evict cache]
```

## Why FlowWarden

* **Sub-second latency** — no polling, no TTL guessing
* **`@Filter`** to react only to updates on cacheable collections