- Optimized: Single query with CASE statements (60-6000x faster)
- Legacy: Preserved original implementation for easy rollback
- Rollback flag: private bool \$useOptimizedQuery = true
- Tests: 12 total tests (8 optimization + 4 service)
Performance: 1 query vs 6N queries (N = client count)
Data quality: 100% match validated by test suite
David Bomba