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This skill provides a comprehensive framework for implementing secure, multi-tenant authentication in TanStack Start applications. It leverages better-auth for versatile login methods including magic links and passkeys, integrates Doppler for secret management, and enforces strict multi-tenancy by requiring tenant_id across users and sessions. It is specifically designed for developers building SaaS applications who need scalable, secure session management with Redis and robust OAuth integration while maintaining high security standards through RLS and environment variable protection.