Supabase is an open source Firebase alternative. Start your project with a Postgres database, Authentication, instant APIs, Edge Functions, Realtime subscriptions, and Storage.

Supabase

I have a simple 1:1 chat app. I have the following tables: `channel_users`, `channels`, `messages`, and `users`. I want to get all channels based on the user id (from `channel_users`). Any ideas on how to construct that using Supabase?

If you have not worked this out it would probably help to give a bit more info on the key relations (ids) in the different tables.  It is not clear (at least to me) what you want to query.