services/metrics_service.py

def update_metrics(detected_items):
    items = detected_items if detected_items else []
    return {
        "items": items,
        "total_detected": len(items),
        "cracks": len([item for item in items if item['type'] == 'crack']),
        "holes": len([item for item in items if item['type'] == 'hole'])
    }