supabase-auth-storage-realtime-core

# Supabase Auth + Storage + Realtime Core ## Overview Implement the three pillars that turn a Supabase database into a full application backend: user authentication (email/password, OAuth, magic links, session lifecycle), file storage (uploads, downloads, signed URLs, bucket-level RLS policies), and real-time subscriptions (Postgres change events, client-to-client broadcast, presence tracking). Every operation integrates with Row-Level Security through `auth.uid()`. ## Prerequisites - Supabase project created at [supabase.com/dashboard](https://supabase.com/dashboard) - `@supabase/supabase-js` v2 installed (`npm install @supabase/supabase-js`) - `SUPABASE_URL` and `SUPABASE_ANON_KEY` available from project Settings > API - For Python: `pip install supabase` (wraps `postgrest-py`, `gotrue-py`, `storage3`, `realtime-py`) ## Instructions ### Step 1: Auth — User Registration, Login, and OAuth Initialize the client and implement the three primary auth flows: email/password, OAuth provider, and passwordless magic link. **TypeScript** ```typescript import { createClient } from '@supabase/supabase-js' const supabase = createClient( process.env.SUPABASE_URL!, process.env.SUPABASE_ANON_KEY! ) // ── Sign up a new user ── const { data: signUpData, error: signUpError } = await supabase.auth.signUp({ email: 'user@example.com', password: 'secure-password-123', options: { data: { username: 'newuser', full_name: 'New User' }, // → raw_user_meta_data }, }) // If ema...