realtime-features

To implement live updates and user presence with Supabase, use the Supabase client-side SDK to integrate Postgres Change Data Capture for live data synchronization, the Presence API for online status monitoring, and Broadcast channels for ephemeral event handling.

The best way to track active users viewing a resource is by utilizing the Supabase Presence API, which monitors user connections and disconnects to accurately reflect which participants are currently viewing or interacting with a specific resource.

Yes, you can use Supabase Broadcast channels for typing indicators and cursor movements, as they facilitate real-time communication specifically for ephemeral events that do not need to be persisted in the database.

You sync database changes automatically by leveraging Postgres Change Data Capture through the Supabase Realtime client-side SDK, which pushes row-level modifications to connected clients instantly without requiring manual refreshes.

Yes, Postgres Change Data Capture must be configured to enable Supabase Realtime to listen to database row changes. The client-side SDK then subscribes to these CDC events to drive dynamic application updates.

Supabase Broadcast is limited to ephemeral events like cursor movements and typing indicators, meaning it does not persist data. Collaborative document content saves require combining Broadcast with Postgres Change Data Capture for permanent synchronization.