Design a Health Monitoring System

Functional Requirements:

• Users can register and log in to the system.
• Users can connect health monitoring devices (e.g., heart rate monitor, step counter, blood pressure monitor) to their account.
• The system collects and stores health data (e.g., heart rate, steps, blood pressure) from users' devices in real-time or near real-time.
• Users can view their historical health data and trends via a dashboard.
• The system can send alerts/notifications to users if abnormal health readings are detected (e.g., high heart rate, abnormal blood pressure).
• Users can export their health data.

Non-Functional Requirements:

• The system should be highly available to ensure users can access their health data at any time.
• Data privacy and security are critical; all health data must be encrypted in transit and at rest.
• The system should be scalable to support up to 1 million daily active users.
• The system should be able to ingest and process health data with low latency (within a few seconds of device upload).
• The system should be maintainable, allowing for easy addition of new health metrics or device integrations in the future.