Design a tRPC API for SaaS Dashboard

Design a tRPC API for a SaaS analytics dashboard with real-time data, user management, and reporting.

Functional Requirements

• User authentication and team management
• Dashboard widgets and customization
• Real-time analytics data
• Report generation and export
• Webhook integrations
• API key management

Non-Functional Requirements

• End-to-end type safety
• Real-time data streaming
• Efficient data aggregations
• Multi-tenant isolation
• Rate limiting per tenant

Questions to Consider

• How do you structure routers for a complex application?
• What patterns work best for real-time data in tRPC?
• How do you handle file uploads and downloads?