diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..ad39130
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,189 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Vue.js 3 frontend for a **Real-Time Energy Monitoring Dashboard** that displays sensor data, room metrics, air quality monitoring, and energy analytics for smart buildings. The frontend connects to either a monolithic backend or microservices architecture via WebSocket and REST APIs.
+
+## Development Commands
+
+```bash
+# Development
+npm run dev              # Start dev server (http://localhost:5173)
+npm run dev-server       # Dev server with host binding
+
+# Building
+npm run build            # Full production build (type-check + build)
+npm run build-only       # Vite build without type checking
+npm run type-check       # TypeScript validation only
+
+# Testing & Quality
+npm run test:unit        # Run Vitest unit tests
+npm run lint             # ESLint with auto-fix
+npm run format           # Prettier code formatting
+```
+
+## Architecture
+
+### State Management (Pinia Stores)
+
+The application uses **5 specialized Pinia stores** with clear separation of concerns:
+
+1. **`websocket.ts`** - WebSocket connection management
+   - Connects to `ws://localhost:8000/ws` or `ws://localhost:8007/ws`
+   - Buffers incoming messages to prevent UI blocking
+   - Handles proxy info messages for microservices routing
+   - Delegates data processing to sensor/room stores
+
+2. **`sensor.ts`** - Sensor device management
+   - Maintains `Map<sensorId, SensorDevice>` for all devices
+   - Tracks `latestReadings` as `Map<sensorId, SensorReading>`
+   - Provides aggregated CO2 metrics (`averageCO2Level`, `maxCO2Level`)
+   - API integration with auth retry logic via `WindowWithAuth` pattern
+
+3. **`room.ts`** - Room-based metrics aggregation
+   - Groups sensor data by room into `RoomMetrics`
+   - Calculates per-room energy consumption and CO2 levels
+   - Provides CO2 status classification (good/moderate/poor/critical)
+   - Estimates occupancy based on environmental data
+
+4. **`energy.ts`** - Energy-specific aggregations
+   - Delegates to other stores (sensor, room, analytics, websocket)
+   - Maintains energy history with configurable `MAX_HISTORY_POINTS`
+   - Provides convenience functions for legacy AnalyticsView compatibility
+
+5. **`analytics.ts`** - System-wide analytics
+   - Fetches analytics summaries from backend API
+   - Tracks system-wide health status
+   - Provides aggregated metrics across all sensors/rooms
+
+6. **`auth.ts`** - JWT authentication
+   - Token generation, validation, and lifecycle management
+   - LocalStorage persistence with expiry checking
+   - Exposed globally via `window.__AUTH_STORE__` for API clients
+
+### API Services (`src/services/`)
+
+Service layer organized by domain:
+- **`api.ts`** - Base API client with types and health checks
+- **`sensorsApi.ts`** - Sensor CRUD operations
+- **`roomsApi.ts`** - Room management and data queries
+- **`analyticsApi.ts`** - Analytics summaries and trends
+- **`authApi.ts`** - Token generation and validation
+- **`index.ts`** - Central export point
+
+All services use the `WindowWithAuth` pattern to access auth store without circular dependencies.
+
+### Data Flow
+
+**Real-time updates:**
+1. WebSocket receives sensor reading from backend
+2. `websocket.ts` buffers and processes message
+3. Data sent to `sensor.ts` (individual readings) AND `room.ts` (aggregations)
+4. Vue components react to store changes via computed properties
+
+**API data fetching:**
+1. Component calls store action (e.g., `sensorStore.fetchApiSensors()`)
+2. Store delegates to API service (e.g., `sensorsApi.getSensors()`)
+3. Service includes auth header via `useAuthStore().getAuthHeader()`
+4. On 401 error, service calls `window.__AUTH_STORE__.ensureAuthenticated()`
+5. Retries request with new token
+
+### WindowWithAuth Pattern
+
+To avoid circular imports when stores need authentication, the auth store is attached to the global window object:
+
+```typescript
+// In main.ts
+(window as any).__AUTH_STORE__ = authStore
+
+// In other stores/services
+interface WindowWithAuth extends Window {
+  __AUTH_STORE__?: {
+    ensureAuthenticated: () => Promise<boolean>
+  }
+}
+
+const authStore = (window as WindowWithAuth).__AUTH_STORE__
+if (authStore) await authStore.ensureAuthenticated()
+```
+
+Used in: `sensor.ts`, `room.ts`, `analytics.ts`, `api.ts`
+
+## Data Models
+
+### Dual Format Support
+
+The system handles two data formats for backward compatibility:
+
+**Legacy Format (energy only):**
+```typescript
+{ sensorId: string, timestamp: number, value: number, unit: string }
+```
+
+**Multi-Metric Format (current):**
+```typescript
+{
+  sensor_id: string
+  room: string
+  timestamp: number
+  energy: { value: number, unit: string }
+  co2: { value: number, unit: string }
+  temperature?: { value: number, unit: string }
+}
+```
+
+### Partial Reading Support
+
+The system now supports **partial sensor readings** where a single message may contain only energy OR only CO2 data.
+
+**Implementation:**
+- `src/stores/room.ts:44-121` - `updateRoomData()` accepts partial readings and aggregates by metric type
+- `src/stores/websocket.ts:118-144` - Processes any reading with a room field
+- Energy metrics aggregate from sensors with `energy.value !== undefined`
+- CO2 metrics aggregate from sensors with `co2.value !== undefined`
+
+This allows `data_simulator_enhanced.py` to send single-metric readings while still populating room-level aggregations correctly.
+
+## Routing
+
+5 main views in `src/router/index.ts`:
+- `/` - HomeView (dashboard overview)
+- `/sensors` - SensorManagementView (sensor CRUD)
+- `/ai-optimization` - AIOptimizationView (AI features)
+- `/analytics` - AnalyticsView (detailed analytics)
+- `/settings` - SettingsView (configuration)
+
+## Backend Integration
+
+**WebSocket endpoints:**
+- Monolithic: `ws://localhost:8000/ws`
+- Microservices: `ws://localhost:8007/ws` (sensor service direct)
+
+**REST API:** `http://localhost:8000` (API Gateway for microservices)
+
+**Authentication:** JWT tokens via Token Service (port 8001)
+
+## Component Structure
+
+**Views:** Page-level components in `/views/`
+**Cards:** Reusable metric cards in `/components/cards/`
+**Charts:** Visualization components (multiple chart libraries: ApexCharts, Chart.js, ECharts)
+
+## Key Technologies
+
+- **Vue 3** - Composition API with `<script setup>`
+- **TypeScript** - Type-safe development
+- **Pinia** - State management
+- **Vue Router** - Client-side routing
+- **Vite** - Build tool with HMR
+- **Tailwind CSS** - Utility-first styling
+- **ECharts** - Primary charting library
+- **Vitest** - Unit testing framework
+
+## Prerequisites
+
+- **Node.js 20.19.0+ or 22.12.0+**
+- **Redis** on `localhost:6379` (for real-time data)
+- **Backend** on `localhost:8000` (monolithic or API Gateway)
diff --git a/src/components/cards/AirQualityCard.vue b/src/components/cards/AirQualityCard.vue
index a3f7524..92e7298 100644
--- a/src/components/cards/AirQualityCard.vue
+++ b/src/components/cards/AirQualityCard.vue
@@ -31,16 +31,16 @@
       
       <div v-for="room in roomsList" :key="room.room" class="flex items-center justify-between p-2 rounded">
         <div class="flex items-center gap-2">
-          <div 
+          <div
             class="w-3 h-3 rounded-full"
-            :class="getCO2StatusColor(room.co2.status)"
+            :class="getCO2StatusColor(room.co2?.status || 'good')"
           ></div>
           <span class="text-sm font-medium text-gray-900">{{ room.room }}</span>
         </div>
         <div class="text-right">
-          <div class="text-sm text-gray-900">{{ Math.round(room.co2.current) }} ppm</div>
-          <div class="text-xs" :class="getCO2TextColor(room.co2.status)">
-            {{ room.co2.status.toUpperCase() }}
+          <div class="text-sm text-gray-900">{{ Math.round(room.co2?.current || 0) }} ppm</div>
+          <div class="text-xs" :class="getCO2TextColor(room.co2?.status || 'good')">
+            {{ (room.co2?.status || 'good').toUpperCase() }}
           </div>
         </div>
       </div>
@@ -75,14 +75,17 @@ import { useRoomStore } from '@/stores/room'
 const roomStore = useRoomStore()
 
 const roomsList = computed(() => {
-  return Array.from(roomStore.roomsData.values()).sort((a, b) =>
-    b.co2.current - a.co2.current // Sort by CO2 level descending
-  )
+  return Array.from(roomStore.roomsData.values())
+    .filter(room => room.co2) // Only include rooms with CO2 data
+    .sort((a, b) =>
+      (b.co2?.current || 0) - (a.co2?.current || 0) // Sort by CO2 level descending
+    )
 })
 
 const overallCO2 = computed(() => {
   if (roomsList.value.length === 0) return 0
-  return roomsList.value.reduce((sum, room) => sum + room.co2.current, 0) / roomsList.value.length
+  const total = roomsList.value.reduce((sum, room) => sum + (room.co2?.current || 0), 0)
+  return total / roomsList.value.length
 })
 
 const overallStatus = computed(() => {
@@ -90,18 +93,18 @@ const overallStatus = computed(() => {
 })
 
 const roomsWithGoodAir = computed(() => {
-  return roomsList.value.filter(room => room.co2.status === 'good').length
+  return roomsList.value.filter(room => room.co2?.status === 'good').length
 })
 
 const roomsNeedingAttention = computed(() => {
-  return roomsList.value.filter(room => ['poor', 'critical'].includes(room.co2.status)).length
+  return roomsList.value.filter(room => room.co2?.status && ['poor', 'critical'].includes(room.co2.status)).length
 })
 
 const recommendations = computed(() => {
   const recs = []
-  const criticalRooms = roomsList.value.filter(room => room.co2.status === 'critical')
-  const poorRooms = roomsList.value.filter(room => room.co2.status === 'poor')
-  
+  const criticalRooms = roomsList.value.filter(room => room.co2?.status === 'critical')
+  const poorRooms = roomsList.value.filter(room => room.co2?.status === 'poor')
+
   if (criticalRooms.length > 0) {
     recs.push(`Immediate ventilation needed in ${criticalRooms[0].room}`)
   }
@@ -111,7 +114,7 @@ const recommendations = computed(() => {
   if (overallCO2.value > 800) {
     recs.push('Consider adjusting HVAC settings building-wide')
   }
-  
+
   return recs.slice(0, 3) // Max 3 recommendations
 })
 
diff --git a/src/components/cards/RoomMetricsCard.vue b/src/components/cards/RoomMetricsCard.vue
index f72103c..f2c8da6 100644
--- a/src/components/cards/RoomMetricsCard.vue
+++ b/src/components/cards/RoomMetricsCard.vue
@@ -13,9 +13,9 @@
           <h3 class="font-medium text-gray-900">{{ room.room }}</h3>
           <div class="flex items-center gap-2">
             <!-- CO2 Status Indicator -->
-            <div 
+            <div
               class="w-3 h-3 rounded-full"
-              :class="getCO2StatusColor(room.co2.status)"
+              :class="getCO2StatusColor(room.co2!.status)"
             ></div>
             <!-- Occupancy Indicator -->
             <div class="flex items-center gap-1 text-xs text-gray-500">
@@ -32,15 +32,15 @@
           <!-- Energy -->
           <div class="bg-blue-50 rounded p-2">
             <div class="text-blue-600 font-medium">Energy</div>
-            <div class="text-blue-900">{{ room.energy.current.toFixed(2) }} {{ room.energy.unit }}</div>
-            <div class="text-blue-600 text-xs">Total: {{ room.energy.total.toFixed(2) }}</div>
+            <div class="text-blue-900">{{ room.energy!.current.toFixed(2) }} {{ room.energy!.unit }}</div>
+            <div class="text-blue-600 text-xs">Total: {{ room.energy!.total.toFixed(2) }}</div>
           </div>
 
           <!-- CO2 -->
-          <div class="rounded p-2" :class="getCO2BackgroundColor(room.co2.status)">
-            <div class="font-medium" :class="getCO2TextColor(room.co2.status)">CO2</div>
-            <div :class="getCO2TextColor(room.co2.status)">{{ Math.round(room.co2.current) }} {{ room.co2.unit }}</div>
-            <div class="text-xs" :class="getCO2TextColor(room.co2.status)">{{ room.co2.status.toUpperCase() }}</div>
+          <div class="rounded p-2" :class="getCO2BackgroundColor(room.co2!.status)">
+            <div class="font-medium" :class="getCO2TextColor(room.co2!.status)">CO2</div>
+            <div :class="getCO2TextColor(room.co2!.status)">{{ Math.round(room.co2!.current) }} {{ room.co2!.unit }}</div>
+            <div class="text-xs" :class="getCO2TextColor(room.co2!.status)">{{ room.co2!.status.toUpperCase() }}</div>
           </div>
         </div>
 
@@ -77,18 +77,19 @@ import { useRoomStore } from '@/stores/room'
 const roomStore = useRoomStore()
 
 const roomsList = computed(() => {
-  return Array.from(roomStore.roomsData.values()).sort((a, b) =>
-    a.room.localeCompare(b.room)
-  )
+  return Array.from(roomStore.roomsData.values())
+    .filter(room => room.energy && room.co2) // Only show rooms with both metrics
+    .sort((a, b) => a.room.localeCompare(b.room))
 })
 
 const totalEnergy = computed(() => {
-  return roomsList.value.reduce((sum, room) => sum + room.energy.current, 0)
+  return roomsList.value.reduce((sum, room) => sum + (room.energy?.current || 0), 0)
 })
 
 const averageCO2 = computed(() => {
   if (roomsList.value.length === 0) return 0
-  return roomsList.value.reduce((sum, room) => sum + room.co2.current, 0) / roomsList.value.length
+  const total = roomsList.value.reduce((sum, room) => sum + (room.co2?.current || 0), 0)
+  return total / roomsList.value.length
 })
 
 const getCO2StatusColor = (status: string) => {
diff --git a/src/stores/energy.ts b/src/stores/energy.ts
index ba6e154..d5a35b9 100644
--- a/src/stores/energy.ts
+++ b/src/stores/energy.ts
@@ -5,7 +5,7 @@ import { useSensorStore } from './sensor'
 import { useRoomStore } from './room'
 import { useAnalyticsStore } from './analytics'
 
-const MAX_HISTORY_POINTS = 100
+const MAX_HISTORY_POINTS = 48
 
 /**
  * Energy Store - Simplified to only track energy consumption metrics
@@ -67,7 +67,7 @@ export const useEnergyStore = defineStore('energy', () => {
         energyHistory.shift()
         energyTimestamps.shift()
       }
-    }
+    },
   )
 
   // Update current consumption (called from components or watchers)
diff --git a/src/stores/room.ts b/src/stores/room.ts
index 5f68a25..4adf0ba 100644
--- a/src/stores/room.ts
+++ b/src/stores/room.ts
@@ -13,13 +13,15 @@ interface WindowWithAuth extends Window {
 interface RoomMetrics {
   room: string
   sensors: string[]
-  energy: {
+  energySensors: string[] // Track which sensors provide energy data
+  co2Sensors: string[] // Track which sensors provide CO2 data
+  energy?: {
     current: number
     total: number
     average: number
     unit: string
   }
-  co2: {
+  co2?: {
     current: number
     average: number
     max: number
@@ -44,9 +46,9 @@ export const useRoomStore = defineStore('room', () => {
   function updateRoomData(data: SensorReading): void {
     const sensorStore = useSensorStore()
 
-    // Validate data structure and provide fallbacks
-    if (!data.energy || !data.co2) {
-      console.warn('Invalid sensor reading data, missing energy or co2 properties:', data)
+    // Accept partial readings - validate that we have at least room and sensor_id
+    if (!data.room || !data.sensor_id) {
+      console.warn('Invalid sensor reading data, missing room or sensor_id:', data)
       return
     }
 
@@ -57,11 +59,12 @@ export const useRoomStore = defineStore('room', () => {
     let roomMetrics = roomsData.get(data.room)
 
     if (!roomMetrics) {
+      // Initialize with minimal required fields - energy and co2 are optional
       roomMetrics = {
         room: data.room,
-        sensors: [data.sensor_id],
-        energy: { current: 0, total: 0, average: 0, unit: data.energy?.unit || 'kWh' },
-        co2: { current: 0, average: 0, max: 0, status: 'good', unit: data.co2?.unit || 'ppm' },
+        sensors: [],
+        energySensors: [],
+        co2Sensors: [],
         occupancyEstimate: 'low',
         lastUpdated: data.timestamp,
       }
@@ -73,32 +76,78 @@ export const useRoomStore = defineStore('room', () => {
       roomMetrics.sensors.push(data.sensor_id)
     }
 
+    // Track which sensors provide which metrics
+    if (data.energy?.value !== undefined && !roomMetrics.energySensors.includes(data.sensor_id)) {
+      roomMetrics.energySensors.push(data.sensor_id)
+    }
+    if (data.co2?.value !== undefined && !roomMetrics.co2Sensors.includes(data.sensor_id)) {
+      roomMetrics.co2Sensors.push(data.sensor_id)
+    }
+
     // Recalculate room metrics from all sensors in the room
     const roomSensors = Array.from(sensorStore.latestReadings.values()).filter(
       (reading) => reading.room === data.room,
     )
 
-    // Energy calculations
-    roomMetrics.energy.current = roomSensors.reduce((sum, sensor) => sum + sensor.energy.value, 0)
-    roomMetrics.energy.total += data.energy.value // Accumulate total
-    roomMetrics.energy.average = roomMetrics.energy.total / roomSensors.length
+    // Energy calculations - only if energy data is present in ANY sensor
+    const energySensors = roomSensors.filter((sensor) => sensor.energy?.value !== undefined)
+    if (energySensors.length > 0) {
+      // Initialize energy object if it doesn't exist
+      if (!roomMetrics.energy) {
+        roomMetrics.energy = {
+          current: 0,
+          total: 0,
+          average: 0,
+          unit: data.energy?.unit || 'kWh',
+        }
+      }
 
-    // CO2 calculations
-    const co2Values = roomSensors.map((sensor) => sensor.co2.value)
-    roomMetrics.co2.current = co2Values.reduce((sum, val) => sum + val, 0) / co2Values.length
-    roomMetrics.co2.max = Math.max(roomMetrics.co2.max, ...co2Values)
-    roomMetrics.co2.average = (roomMetrics.co2.average + roomMetrics.co2.current) / 2
+      roomMetrics.energy.current = energySensors.reduce(
+        (sum, sensor) => sum + (sensor.energy?.value || 0),
+        0,
+      )
+      if (data.energy?.value !== undefined) {
+        roomMetrics.energy.total += data.energy.value // Accumulate total only for this reading
+      }
+      roomMetrics.energy.average = roomMetrics.energy.total / energySensors.length
+      if (data.energy?.unit) {
+        roomMetrics.energy.unit = data.energy.unit
+      }
+    }
 
-    // CO2 status classification
-    if (roomMetrics.co2.current < 400) roomMetrics.co2.status = 'good'
-    else if (roomMetrics.co2.current < 1000) roomMetrics.co2.status = 'moderate'
-    else if (roomMetrics.co2.current < 5000) roomMetrics.co2.status = 'poor'
-    else roomMetrics.co2.status = 'critical'
+    // CO2 calculations - only if co2 data is present in ANY sensor
+    const co2Sensors = roomSensors.filter((sensor) => sensor.co2?.value !== undefined)
+    if (co2Sensors.length > 0) {
+      // Initialize co2 object if it doesn't exist
+      if (!roomMetrics.co2) {
+        roomMetrics.co2 = {
+          current: 0,
+          average: 0,
+          max: 0,
+          status: 'good',
+          unit: data.co2?.unit || 'ppm',
+        }
+      }
 
-    // Occupancy estimate based on CO2 levels
-    if (roomMetrics.co2.current < 600) roomMetrics.occupancyEstimate = 'low'
-    else if (roomMetrics.co2.current < 1200) roomMetrics.occupancyEstimate = 'medium'
-    else roomMetrics.occupancyEstimate = 'high'
+      const co2Values = co2Sensors.map((sensor) => sensor.co2?.value || 0)
+      roomMetrics.co2.current = co2Values.reduce((sum, val) => sum + val, 0) / co2Values.length
+      roomMetrics.co2.max = Math.max(roomMetrics.co2.max, ...co2Values)
+      roomMetrics.co2.average = (roomMetrics.co2.average + roomMetrics.co2.current) / 2
+      if (data.co2?.unit) {
+        roomMetrics.co2.unit = data.co2.unit
+      }
+
+      // CO2 status classification
+      if (roomMetrics.co2.current < 400) roomMetrics.co2.status = 'good'
+      else if (roomMetrics.co2.current < 1000) roomMetrics.co2.status = 'moderate'
+      else if (roomMetrics.co2.current < 5000) roomMetrics.co2.status = 'poor'
+      else roomMetrics.co2.status = 'critical'
+
+      // Occupancy estimate based on CO2 levels
+      if (roomMetrics.co2.current < 600) roomMetrics.occupancyEstimate = 'low'
+      else if (roomMetrics.co2.current < 1200) roomMetrics.occupancyEstimate = 'medium'
+      else roomMetrics.occupancyEstimate = 'high'
+    }
 
     roomMetrics.lastUpdated = data.timestamp
   }
@@ -192,8 +241,8 @@ export const useRoomStore = defineStore('room', () => {
       sensorCount: sensorsInRoom.length,
       sensorTypes: [...new Set(sensorsInRoom.map((s) => s.type))],
       hasMetrics: !!roomMetrics,
-      energyConsumption: roomMetrics?.energy.current || 0,
-      co2Level: roomMetrics?.co2.current || 0,
+      energyConsumption: roomMetrics?.energy?.current || 0,
+      co2Level: roomMetrics?.co2?.current || 0,
       lastUpdated: roomMetrics?.lastUpdated || null,
     }
   }
@@ -263,11 +312,11 @@ export const useRoomStore = defineStore('room', () => {
     const result = await handleApiCall(() => roomsApi.getRooms())
     if (result) {
       // Handle both response formats: {rooms: [...]} or direct array [...]
-      const roomsArray = Array.isArray(result) ? result : result.rooms || []
+      const roomsArray = Array.isArray(result) ? result : (result as any).rooms || []
       apiRooms.value = roomsArray
 
       // Update available rooms from API data
-      const roomNames = roomsArray.map((room) => room.name || room.room).filter((name) => name)
+      const roomNames = roomsArray.map((room: any) => room.name || room.room).filter((name: string) => name)
       if (roomNames.length > 0) {
         availableRooms.value = [...new Set([...availableRooms.value, ...roomNames])].sort()
       }
diff --git a/src/stores/websocket.ts b/src/stores/websocket.ts
index 04fd072..4e5a2af 100644
--- a/src/stores/websocket.ts
+++ b/src/stores/websocket.ts
@@ -124,22 +124,19 @@ export const useWebSocketStore = defineStore('websocket', () => {
     const sensorStore = useSensorStore()
     const roomStore = useRoomStore()
 
-    // Handle new multi-metric data
-    // Only update room data if we have the proper structure
-    if (data.energy && data.co2 && data.room) {
+    // Update individual sensor readings first
+    sensorStore.updateLatestReading(data)
+
+    // Update room data if we have room information (accepts partial readings)
+    if (data.room) {
       if (data.energy) {
         sensorStore.updateEnergySensors(data)
       }
       roomStore.updateRoomData(data)
     }
 
-    // Map the sensor ID for individual sensor updates
-    // const mappedSensorId = mapWebSocketSensorId(data.sensorId)
-    const mappedData = { ...data, sensorId: data.sensorId, id: data.sensorId }
-    sensorStore.updateLatestReading(data) // Update individual sensor readings for cards
-
+    // Update time series for chart if energy data is available
     if (data.energy) {
-      // Update time series for chart (use energy values if available)
       const newLabel = new Date(data.timestamp * 1000).toLocaleTimeString()
       timeSeriesData.labels.push(newLabel)
       timeSeriesData.datasets[0].data.push(data.energy?.value)