Fixed CORS issue preventing frontend from communicating with backend. **Problem Found:** The backend was missing CORS middleware configuration. When the frontend (localhost:3000) tried to fetch from the backend (localhost:8000), browser CORS policy blocked the requests. **Changes Made:** - `app/main.py:6` - Added CORSMiddleware import - `app/main.py:31-38` - Added CORS middleware configuration allowing localhost:3000 **Also Fixed:** - `pyproject.toml` - Added build-system and packages config to fix package discovery issue **Verification:** - All 74 backend tests pass - All 15 frontend tests pass (8 API + 7 outlet-grid) - QA verified via browser: - All 24 outlets displayed in responsive grid (2-6 columns) - Each outlet shows: number, name, status indicator (green/red), current in amps - Summary shows online count and total current - Manual refresh button and timestamp working - Auto-refresh every 5 seconds functional - Device information displays correctly Screenshots saved: /tmp/apc15_final.png, /tmp/apc15_desktop.png, /tmp/apc15_tablet.png, /tmp/apc15_mobile.png

[QA] FAILED - Backend service not running The outlet grid component implementation is well-coded with good test coverage (15/15 tests pass), but QA FAILED due to missing backend service. **Critical Issue**: Backend API not running on port 8000 - Frontend loads but all API calls fail with 404 errors - Cannot verify outlet grid functionality without live backend - Both Device Information and Outlets sections show error states **Code Quality** ✅: - Clean React component structure - Comprehensive error handling & retry logic - 7 test cases covering all scenarios - Responsive grid layout (2-6 columns) - Auto-refresh every 5 seconds (tested in unit tests) **What Cannot Be Verified** ❌: - Display of actual outlet data - Status indicators (green/red) - Current draw display - Summary calculations - Auto-refresh with real data - Manual refresh with real data **Required Actions**: 1. Start backend service on port 8000 2. Verify backend serves /api/device and /api/outlets 3. Re-run QA verification Full QA report: /tmp/qa-APC-15.md Screenshots: /tmp/outlet_grid_initial.png, /tmp/outlet_grid_after_refresh.png Status changed to: todo (blocked on backend setup)

Implemented outlet grid view with status: **Files changed:** - `frontend/src/components/outlet-grid.tsx` - New OutletGrid component with: - Visual grid layout (2-6 columns responsive) - OutletCard component showing outlet #, name, status indicator (green/red), current in amps - OutletCardSkeleton for loading state - Auto-refresh every 5 seconds via useEffect interval - Manual refresh button with last updated timestamp - Summary showing online count and total current - Error handling with retry capability - `frontend/src/components/outlet-grid.test.tsx` - 7 test cases covering: - Loading skeleton display - All 24 outlets rendering - Status and current display - Error state - Auto-refresh (5 second interval) - Manual refresh button - Summary information - `frontend/src/app/page.tsx` - Added OutletGrid section to dashboard - `frontend/package.json` - Added @testing-library/user-event dev dependency **Verification:** - Build passes: `npm run build` completes successfully - Tests pass: 15 tests passing (8 existing + 7 new)