# How the Multica Inbox Notification System Tracks User Updates

> Discover how the Multica inbox notification system tracks user updates using a dual-path architecture with React Query, optimistic UI, and WebSockets for real-time sync. Learn more!

- Repository: [multica-ai/multica](https://github.com/multica-ai/multica)
- Tags: internals
- Published: 2026-04-11

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**The Multica inbox notification system tracks user updates through a dual-path architecture combining React Query cache management, optimistic UI mutations, and WebSocket-driven real-time synchronization.**

The notification system in the `multica-ai/multica` repository delivers live-updating inbox lists that reflect new comments, issue status changes, and user mentions without manual refreshes. It achieves this by coordinating TanStack Query cache keys, server-sent WebSocket events, and fine-grained cache updates across several specialized modules.

## Query Key Architecture and Data Fetching

The system scopes inbox data to the current workspace using a