## ✅ QA VERIFICATION: PASSED **Verification Date:** 2025-12-22 **QA Agent:** code-verification-qa ### Summary All requirements successfully implemented and verified. Implementation is production-ready. ### Test Results - ✅ All 55 frontend tests pass (including 14 new tests for draggable rack diagram) - ✅ Code quality: Excellent (proper TypeScript, React patterns, error handling) - ✅ Requirements: All met (device cards, drag-drop, U positioning, persistence) - ✅ Edge cases: Properly handled (null positions, API errors, long names, etc.) ### Key Verifications 1. ✅ Device cards render correctly with name, icon, U height, and status 2. ✅ Cards span correct number of U units (1U, 2U, 4U tested) 3. ✅ Drag-and-drop works with snap-to-U positioning 4. ✅ Position changes persist to backend via PUT /api/devices/{id} 5. ✅ Validation prevents overlaps and out-of-bounds placement 6. ✅ QA acceptance criteria met: Can drag 4U server from U10 to U20, persists after refresh ### Files Added - frontend/src/components/draggable-rack-diagram.tsx (526 lines) - frontend/src/components/draggable-rack-diagram.test.tsx (327 lines, 14 tests) - frontend/src/components/rack-diagram-section.tsx (197 lines) - frontend/src/lib/api.ts (46 lines added) **Detailed QA report:** /tmp/qa-APC-18.md **Status:** Ready for production deployment.

## Implementation Complete ### Changes Made 1. **New DraggableRackDiagram component** (frontend/src/components/draggable-rack-diagram.tsx:1-526) - SVG-based rack diagram with drag-and-drop support - Device cards render at correct U positions based on rack_position and height_units - Shows device name, type icon (server/network/storage/other), and U height badge - Status indicator (green/yellow/red) based on outlet states - Drag-and-drop repositioning with snap to U positions - Validates placement (no overlaps, within rack bounds) - Persists position changes to backend via PUT /api/devices/{id} 2. **New API functions** (frontend/src/lib/api.ts:197-219) - getRackDevices(): Fetch all devices from backend - getRackDevice(deviceId): Fetch single device - updateRackDevice(deviceId, data): Update device position 3. **RackDiagramSection component** (frontend/src/components/rack-diagram-section.tsx) - Integrates draggable rack diagram into the page - Auto-refreshes every 10 seconds ### Test Results All 55 tests pass including 14 new tests for draggable rack diagram.