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1. Create a free Postgres database at neon.tech (or Supabase / Vercel Postgres)
2. Copy its connection string
3. In Vercel → your project → Settings → Environment Variables, add DATABASE_URL
4. Optional: add STRIPE_SECRET_KEY (from stripe.com) for card payments, and AUTH_SECRET (any long random string)
5. Redeploy the project, then refresh this page

I've added it — refresh