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

# HydrationEngine

> Invisible root component that runs background sync.

# HydrationEngine

The HydrationEngine (components/system/HydrationEngine.tsx) is an invisible React component mounted at the root of the app tree inside the ThemeProvider.

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## Implementation

```typescript theme={null}
export function HydrationEngine() {
  useHydrationSync();
  return null; // Renders nothing -- pure side-effect component
}
```

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## Purpose

This component exists solely to run the useHydrationSync hook at the root level. By mounting it inside the provider tree (after authentication and database providers are available), it ensures continuous background synchronization between the Convex cloud and local SQLite.

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## Future Enhancement

The component can be extended to render a full-screen blur overlay during Amnesia Mode (complete database rebuild), preventing the user from interacting with stale or empty data.