# How Comments, Reactions, and Issue Subscriptions Work in Multica: A Technical Deep Dive

> Discover how Multica seamlessly integrates comments, reactions, and issue subscriptions. Explore real-time sync, PostgreSQL persistence, and optimistic UI states in this technical deep dive.

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

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**Multica implements comment reactions and issue subscriptions as first-class database resources with real-time synchronization via REST APIs, PostgreSQL persistence, internal WebSocket broadcasts, and React hooks that maintain optimistic UI states.**

The open-source Multica platform treats user engagement—emoji reactions on comments and subscription-based watching of issues—as core entities rather than secondary metadata. This architecture ensures real-time consistency across distributed clients while maintaining data integrity in PostgreSQL. Understanding this implementation reveals how modern full-stack applications coordinate state between backend handlers, database layers, and frontend React components