Multi-Tenant SaaS Starter
A production-shaped multi-tenant backend over Postgres: API-key authentication (sha256-hashed, generated server-side, revocable), strict per-tenant data isolation, plan-based limits, and usage metering. Every request resolves its API key to exactly one tenant and every query is scoped to it — cross-tenant access is structurally impossible. The 'Air Pipe is a real backend, not a workflow tool' pack.