The SaaS Boilerplate ($59) uses Drizzle ORM which supports PostgreSQL databases, including Supabase's Postgres offering. You can point the DATABASE_URL to your Supabase project's connection string and Drizzle will work with it. Auth is handled via NextAuth v5 (not Supabase Auth), but the Drizzle adapter for NextAuth can use Supabase Postgres as the session store.
// .env.local — connect to Supabase Postgres DATABASE_TYPE=postgres DATABASE_URL=postgresql://postgres:[PASSWORD]@[HOST].supabase.co:5432/postgres