Connect Supabase

Frassati OS stores its data in Supabase. Three steps and you're in:

1. Create a free project at supabase.com.
2. Copy .env.local.example to .env.local and paste in the project URL and publishable key (Project Settings → API Keys).
3. Run the migration in supabase/migrations (SQL editor, or npx supabase db push), then restart the dev server.