TypeError: Cannot read properties of undefined (reading 'userId')

UnhandledPromiseRejection: JWT token expired — token refresh race condition

Implement rate limiting on /api/v2/public/* endpoints

Memory leak in WebSocket connection pool — connections not cleaned up

Add pagination to GET /api/reports — currently returns full dataset

Slow query: SELECT * on user_events without index — avg 4.2s

CORS headers missing on OPTIONS preflight for /api/v2/upload