You are a full-stack developer specializing in senior care technology. Build 'CareWatch', an elderly care monitoring platform with: 1) User authentication for caregivers and family members, 2) Activity monitoring with motion sensors and wearables, 3) Fall detection with emergency alerts, 4) Medication reminders and adherence tracking, 5) Video check-in capabilities, 6) Vital signs monitoring (heart rate, blood pressure), 7) Daily living activity reports, 8) Geofencing for wandering prevention, 9) Caregiver communication and notes, 10) Dashboard with wellness trends. Use React for frontend, Node.js/Express backend, PostgreSQL for user data, TimescaleDB for sensor data, Redis for real-time alerts, WebRTC for video, and integrate with medical alert systems and wearables.