docs: add database.sql and sync-rules.yaml to react-supabase-todolist demo

[JexanJoel]

Fixes #860

The react-supabase-todolist demo was missing the Supabase database setup file and PowerSync sync rules that other demos in this repo include (e.g. react-native-web-supabase-todolist).

This PR adds:

• database.sql - creates the lists and todos tables, enables RLS with policies scoped to owner_id, and creates the powersync publication
• sync-rules.yaml - defines the user_lists bucket scoped per authenticated user
• Updates README.md with numbered step-by-step setup instructions referencing these new files

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[simolus3]

Thanks for the contribution!

[simolus3]

Can we use the Sync Stream syntax for this? Also, we should perhaps rename this to sync-streams.yaml.

[JexanJoel]

Yes we can. btw done Renamed the file to sync-streams.yaml and updated the content to use the sync_streams syntax.

[simolus3]

I guess we should also add a note to set a password then?

[JexanJoel]

Added a comment with instructions to set a password for the role.

[simolus3]

This is not a valid configuration file, it should be something like this:

config:
  edition: 3

streams:
  user_data:
    auto_subscribe: true
    queries:
      # Separate stream per todo list, scoped to the authenticated user
      - SELECT * FROM lists WHERE owner_id = auth.user_id()
      - SELECT todos.* FROM todos INNER JOIN lists ON todos.list_id = lists.id WHERE lists.owner_id = auth.user_id()

[JexanJoel]

Updated to use the new format with config: edition: 3 and streams syntax, scoped to the authenticated user. Any changes?

[benitav]

I realize we're not consistent with all our demos in this repo yet, but for easier maintainability going forward (not having to update instructions in 20+ demo app Readmes) and approach we adopted in several of the Supabase-based demo app Readmes here is to link to these sections in the docs which should cover all required steps to run the demo (including setting Sync Streams):

Prerequisites:

• To run this demo, you need to have properly configured Supabase and PowerSync projects. Follow the instructions in our Supabase<>PowerSync integration guide:
  • Configure Supabase
  • Configure PowerSync

I'm curious if you just missed these, or if there's an issue with those instructions, or another reason?