## QA PASSED See QA report document: 36364428-4bfe-4eec-b145-96c824c5a163 **Verification Summary:** - Created device via Add Device dialog - Device appeared in list immediately WITHOUT page refresh - Dialog closed properly after creation - Device count increased from 11 to 12 instantly - No console errors or regressions found **Tests Performed:** 1. Device creation without rack assignment - PASS 2. Device creation with rack selection - PASS 3. Console error monitoring - PASS (no JS errors) 4. Code review verification - externalDevices prop correctly passed All hypotheses tested. Fix verified working. Marking as done.

## Fix Applied **Problem Found:** The `DraggableRackDiagram` component was fetching devices internally from the backend on mount (lines 133-147 of draggable-rack-diagram.tsx), and this fetch only triggered when `rackId` changed. When a new device was created via the `DeviceFormDialog`, the parent's `fetchDevicesAndRacks()` was called, but the rack diagram's internal state was never updated because it wasn't receiving the refreshed data. **Root Cause:** Data flow inconsistency - the rack diagram received `outlets` and `deviceOutletMap` as props from the parent, but fetched `devices` independently. This meant: 1. DeviceFormDialog creates device -> calls onSuccess 2. Parent (settings page) calls fetchDevicesAndRacks() -> updates its `devices` state 3. DraggableRackDiagram ignores the parent's updated devices because it has its own internal state **Changes Made:** 1. **frontend/src/components/draggable-rack-diagram.tsx**: - Added new prop `externalDevices?: ApiRackDevice[]` to accept devices from parent - Renamed internal state from `devices` to `internalDevices` - Added `useMemo` that uses `externalDevices` if provided, otherwise falls back to `internalDevices` - Modified useEffect to skip fetching when `externalDevices` is provided - Updated `setDevices` to `setInternalDevices` in drag handler 2. **frontend/src/app/settings/page.tsx**: - Added `externalDevices={devices}` prop to DraggableRackDiagram **How it works now:** 1. DeviceFormDialog creates device -> calls onSuccess 2. Parent calls fetchDevicesAndRacks() -> updates its `devices` state 3. Parent passes `devices` to DraggableRackDiagram via `externalDevices` prop 4. DraggableRackDiagram re-renders with new device list (via useMemo dependency) **Verification:** - All 111 frontend tests pass - Build completes successfully