Title: Optimize Database Queries and Add Performance Monitoring

Description:
Improve application performance by optimizing database queries, adding indexes, and implementing monitoring.

Acceptance Criteria:

• Audit existing MongoDB queries for optimization
• Add appropriate database indexes
• Implement query performance monitoring
• Add database connection pooling optimization
• Create performance benchmarking tests
• Document query optimization guidelines

Technical Details:

• Use MongoDB Compass for query analysis
• Implement query explain plans in development
• Add monitoring with mongoose query middleware

Files to Modify:

• All files in backend/src/models/
• backend/src/config/database.ts
• Add: backend/src/monitoring/query-performance.ts

Tags: performance backend database optimization
Priority: Medium
Estimated Effort: 4-6 days