feat: Add real-time notification center with WebSocket integration

- Add in-app notification system with database storage - Implement bell icon component with unread count badge in dashboard header - Add full Notifications page tab with pagination and filtering (All/Unread/Read) - Implement real-time WebSocket push notifications to all connected clients - Add notification API endpoints: GET, PUT /read, DELETE, POST /clear - Fix critical bug in notificationService where 'status' variable was undefined - Add Notifications route to App.js routing - Enhanced UI with notification popup in header and dedicated full-page view - Auto-reconnect WebSocket with 5s timeout on disconnect - Support rich notification content with resource details and timestamps
2026-01-14 14:51:29 -05:00
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+# Real-Time Updates & Observability Implementation
+
+## 🟢 Completed Features
+
+### 1. **Real-Time WebSocket Push Notifications**
+
+#### Server-Side Enhancements (`server/index.js`):
+- **Enhanced Broadcast Functions**: Created 4 specialized broadcast functions
+  - `broadcastDashboardUpdate()` - Dashboard state changes
+  - `broadcastAlert()` - Real-time alerts
+  - `broadcastIncident()` - Incident updates (started/resolved)
+  - `broadcastMetrics()` - Performance metrics updates
+- **Message Types**: Structured WebSocket messages with typed payloads
+  - `type: 'dashboard'` - Full dashboard refresh
+  - `type: 'alert'` - Individual alerts
+  - `type: 'incident'` - Incident lifecycle events
+  - `type: 'metrics'` - Performance metrics
+
+#### Client-Side Enhancements (`client/src/App.js`):
+- **Enhanced WebSocket Handler**: Receives and processes all message types
+- **Real-Time Notifications UI**: Fixed toast notifications appear in top-right corner
+  - Auto-dismiss after 5 seconds
+  - Color-coded by severity (error/success/info)
+  - Non-blocking, stacks vertically
+- **Automatic Dashboard Refresh**: Refreshes on incident events for real-time data
+
+### 2. **Application Metrics Tracking**
+
+#### New Module: `server/metrics.js`
+- **API Request Tracking**:
+  - Endpoint, method, status code, response time
+  - Per-endpoint aggregation with min/max/average times
+  - Success/error counts and status code breakdown
+- **Error Tracking**:
+  - Centralized error logging with stack traces
+  - Context capture (method, URL, IP address)
+  - Error count aggregation
+- **Metrics API Endpoint**: `GET /api/observability/metrics`
+  - Server uptime
+  - API statistics (request counts, success rates, response times)
+  - Error counts (total and unique)
+
+### 3. **Audit Logging System**
+
+#### New Module: `server/auditLog.js`
+- **Audit Event Tracking**:
+  - `log()` - Generic audit event logging
+  - `logResourceChange()` - Resource CRUD events
+  - `logSettingsChange()` - Configuration changes
+  - `logGroupChange()` - Group management
+  - `logMaintenanceChange()` - Maintenance window events
+- **Event Details Captured**:
+  - Action (create/update/delete)
+  - Entity type and ID
+  - User ID and IP address
+  - Changes before/after values
+  - Timestamp
+- **Audit Log Query API**: `GET /api/observability/audit-logs`
+  - Filters: entityType, entityId, userId, action, dateRange
+  - Summary statistics (events by action type)
+- **Audit Summary**: `GET /api/observability/audit-summary`
+  - 7-day activity breakdown by action
+
+#### Database Integration:
+- **Audit Logs Table**: Stores all audit events with indexes
+- **Error Logs Table**: Stores application errors with stack traces
+
+### 4. **Error Tracking & Logging**
+
+#### Features:
+- **Error Collection**: Automatic error capture in metrics middleware
+- **Error Storage**: Database persistence for error analysis
+- **Recent Errors API**: `GET /api/observability/errors`
+  - Returns last 50 errors with context
+  - Includes stack traces for debugging
+
+### 5. **Observability Dashboard** (`client/src/Observability.js`)
+
+#### Tabs:
+1. **API Metrics Tab**:
+   - Server uptime display
+   - Total API requests counter
+   - Error metrics
+   - Per-endpoint performance table with:
+     - Total requests
+     - Success rate %
+     - Average/min/max response times
+     - Status code distribution
+
+2. **Errors Tab**:
+   - Recent errors list
+   - Error message, context, and timestamp
+   - Visual error log with syntax highlighting
+
+3. **Audit Logs Tab**:
+   - 7-day activity summary
+   - Filterable audit log table
+   - Filters: Entity Type, Entity ID, User ID, Action
+   - Change history tracking
+
+#### Navigation:
+- Added "Observability" link to main navbar
+- Accessible from dashboard navigation
+
+### 6. **Comprehensive Middleware Integration**
+
+#### Request Tracking Middleware:
+```javascript
+- Intercepts all API requests/responses
+- Tracks endpoint, method, status code, duration
+- Captures errors automatically
+- Non-intrusive integration
+```
+
+#### Database Schema Updates (`server/database.js`):
+- **audit_logs table**: Action, entity type/ID, user, changes, IP, timestamp
+- **error_logs table**: Error message, stack trace, context, occurrence timestamp
+- **Indexes**: Optimized queries for audit and error lookups
+
+### 7. **Resource CRUD Audit Logging**
+
+#### Automatic Audit Logs:
+- Resource creation: Logs name, URL, type, enabled status
+- Resource updates: Logs all changed fields
+- Resource deletion: Logs deleted resource details
+- Includes user/IP context for all operations
+
+### 8. **New API Endpoints**
+
+#### Authentication Endpoints:
+- `GET /api/auth/csrf-token` - Generate CSRF tokens
+- `POST /api/auth/refresh-token` - JWT token refresh
+- `POST /api/auth/validate-password` - Password strength checking
+
+#### Observability Endpoints:
+- `GET /api/observability/metrics` - Performance metrics
+- `GET /api/observability/errors` - Error logs (last 50)
+- `GET /api/observability/audit-logs` - Searchable audit logs
+- `GET /api/observability/audit-summary` - Activity summary
+
+---
+
+## 🎯 Real-Time Update Flow
+
+```
+Monitor Check Complete
+    ↓
+Incident Created/Resolved
+    ↓
+Server broadcasts via WebSocket:
+  - broadcastDashboardUpdate()
+  - broadcastIncident(incident)
+    ↓
+Client receives message
+    ↓
+Show toast notification
+    ↓
+Refresh dashboard data
+    ↓
+UI updates in real-time
+```
+
+---
+
+## 📊 Observability Coverage
+
+### What's Now Tracked:
+- ✅ API performance (response times, success rates)
+- ✅ Application errors (messages, stacks, context)
+- ✅ User actions (resource CRUD, settings changes)
+- ✅ System health (uptime, resource counts)
+- ✅ Configuration changes (who, what, when)
+
+### Available Dashboards:
+1. **API Metrics**: Performance insights and endpoint health
+2. **Error Tracking**: Centralized error log with debugging info
+3. **Audit Logs**: Complete change history with filters
+
+---
+
+## 💾 Data Retention
+
+- **Error Logs**: Stored indefinitely (consider adding cleanup job)
+- **Audit Logs**: Stored indefinitely (consider adding cleanup job)
+- **Metrics**: In-memory (resets on server restart)
+
+---
+
+## 🔐 Security Notes
+
+- IP addresses captured for all audit events
+- Error logs may contain sensitive data (review periodically)
+- Audit logs provide full change history for compliance
+- WebSocket messages sent to all connected clients (consider auth)
+
+---
+
+## 🚀 Next Steps
+
+1. **Error Log Cleanup**: Add job to archive old error logs (> 90 days)
+2. **Audit Log Retention**: Implement archive for old audit logs
+3. **Real-time Metrics Push**: Broadcast metrics via WebSocket to Observability tab
+4. **Performance Alerts**: Add threshold-based alerts in metrics
+5. **Export Audit Reports**: PDF/CSV export of audit logs
+6. **Metrics Dashboard Charts**: Add charts for error rate trends, response time trends
+
+---
+
+## 📝 Files Modified/Created
+
+### New Files:
+- `server/metrics.js` - Metrics collection
+- `server/auditLog.js` - Audit logging
+- `client/src/Observability.js` - Observability dashboard
+
+### Modified Files:
+- `server/database.js` - Added audit_logs and error_logs tables
+- `server/index.js` - Added metrics middleware, observability endpoints, enhanced WebSocket
+- `client/src/App.js` - Added notification UI, enhanced WebSocket handler, Observability route
+
+### No Breaking Changes:
+- All existing functionality preserved
+- Backward compatible API
+- Optional observability features
+
@@ -9,7 +9,9 @@ A comprehensive monitoring system for tracking the uptime and performance of you
 - 🔔 **Alert Notifications** - Email and webhook alerts when resources go offline
 - 📝 **Incident Tracking** - Track when resources go down and recover
 - ⚙️ **Configurable Checks** - Set custom check intervals and timeouts
- 🗄️ **Historical Data** - 7 days of check history with detailed statistics
+- 🗄️ **Historical Data** - Configurable data retention with per-resource overrides
+- 📊 **Observability Dashboard** - View metrics, errors, and audit logs with expandable changes
+- 🔐 **Data Retention Management** - Global settings + per-resource retention overrides

 ## Quick Start

@@ -51,6 +53,93 @@ The History page shows detailed check data with two viewing modes:

 See [Usage Guide → History Page](docs/USAGE.md#history-page) for details.

+## Global Settings
+
+Configure default settings for your entire monitoring system in the **Settings Tab**:
+
+### 📧 Email Notifications
+- SMTP configuration with Gmail, Outlook, Yahoo, or custom providers
+- Test email functionality
+- Fallback support for failed notifications
+
+### 🔗 Webhook Notifications  
+- Send incident data to Slack, Discord, or custom webhooks
+- Test webhook functionality
+- Fallback webhook as backup
+
+### ⏱️ Default Monitoring Settings
+- **Check Interval** - How often to check resources (default: 60,000ms = 1 minute)
+- **Request Timeout** - Maximum time to wait for a response (default: 5,000ms)
+- **Data Retention** - How many days to keep check data (1-365 days, default: 30)
+- **Timezone** - Local timezone for all timestamps
+- **Consecutive Failures Threshold** - Number of failures before triggering alert (default: 3)
+- **Incident Failure Threshold** - Number of failures before creating incident (default: 10)
+- **Grace Period** - Wait time before alerting after first failure (default: 300s)
+- **Downtime Threshold** - Minimum downtime before creating incident (default: 600s)
+
+### 🔔 Alert Settings
+- **Alert Retry Logic** - How many times to retry failed alerts (default: 3)
+- **Retry Delay** - Wait time between retries (default: 60s)
+- **Fallback Webhook** - Backup webhook if primary notifications fail
+- **Global Quiet Hours** - Suppress non-critical alerts during specific times
+- **Escalation Hours** - Escalate unresolved incidents after this time (default: 4 hours)
+
+### 📊 Dashboard Settings
+- **Default Sort Order** - How to sort resources in dashboard
+- **Items Per Page** - Pagination size for resource lists (default: 20)
+- **Dashboard Refresh Interval** - How often to fetch fresh data (default: 5,000ms = 5 seconds)
+- **Auto Cleanup** - Automatically archive old check data based on retention period
+
+## Data Retention System
+
+SkyWatch supports **two-tier data retention**:
+
+### Global Retention (Default)
+Set in Settings → Default Monitoring Settings → "Global Data Retention"
+- Applies to all resources by default
+- Retained check data is archived after the specified number of days
+- Can be overridden per-resource
+
+### Per-Resource Retention (Override)
+Set when creating or editing a resource:
+- Leave blank to use global setting
+- Enter a specific number (1-365) to override global retention for that resource
+- Useful for critical services (longer retention) or dev environments (shorter retention)
+
+Example:
+- Global retention: 30 days
+- Production API: 90 days (critical data)
+- Dev server: 7 days (less important)
+
+### How Archival Works
+The scheduler runs daily at 2 AM to:
+1. Check each resource for its retention setting (per-resource or global)
+2. Move old checks to `archived_checks` table
+3. Delete from active `checks` table
+
+## Observability Dashboard
+
+View detailed system observability data in the **Observability Tab**:
+
+### 📊 Metrics
+- API request counts and success rates
+- Response time statistics
+- Error counts by endpoint
+- Performance trends
+
+### ❌ Errors
+- Recent errors with stack traces
+- Error frequency and patterns
+- Detailed error context
+
+### 📋 Audit Logs
+- Complete change history of all resources, settings, and groups
+- Filter by entity type, ID, user, or action
+- **Expandable Changes** - Click "▶ Show Changes" to see full JSON of what changed
+  - Shows old values and new values
+  - Helps track configuration changes over time
+  - Click "▼ Hide" to collapse
+
 ## API Endpoints

 - `GET /api/resources` - List all resources
@@ -0,0 +1,256 @@
+# Real-Time Updates & Observability - Quick Reference
+
+## 🔔 Real-Time Notifications
+
+### User Experience:
+- **Toast notifications** appear in top-right corner when:
+  - Incident is detected (resource down)
+  - Incident is resolved (resource back up)
+  - Critical alerts are triggered
+- Auto-dismiss after 5 seconds
+- Multiple notifications stack vertically
+
+### WebSocket Message Types:
+```javascript
+// Dashboard update
+{ type: 'dashboard', data: { resources: [...], groups: [...] } }
+
+// Alert
+{ type: 'alert', data: { resourceName: '...', message: '...' } }
+
+// Incident
+{ type: 'incident', data: { type: 'started'|'resolved', resourceName: '...' } }
+
+// Metrics
+{ type: 'metrics', data: { uptime: ..., apiStats: [...], errorCount: ... } }
+```
+
+---
+
+## 📊 Observability Dashboard
+
+### Access: 
+**Navigation Bar** → **Observability** or `/observability`
+
+### Tab 1: API Metrics
+Shows performance insights:
+- **Server Uptime**: How long the server has been running
+- **Total API Requests**: Total requests since startup
+- **Errors Logged**: Total errors logged
+- **Unique Errors**: Number of distinct error types
+
+**Endpoint Performance Table:**
+| Column | Meaning |
+|--------|---------|
+| Endpoint | HTTP method + path |
+| Requests | Total requests to this endpoint |
+| Success Rate % | Percentage successful (200-399 status) |
+| Avg Response | Average response time in milliseconds |
+| Min/Max | Best and worst response times |
+
+### Tab 2: Errors
+Lists recent application errors:
+- **Error Message**: What went wrong
+- **Context**: Where it happened (endpoint, IP)
+- **Occurred At**: Timestamp of error
+
+### Tab 3: Audit Logs
+Complete change history with filtering:
+
+**Summary Section:**
+- Shows events from last 7 days
+- Breakdown by action type (create, update, delete)
+
+**Filters:**
+- **Entity Type**: resource, settings, group, maintenance_window
+- **Entity ID**: ID of the changed entity
+- **User ID**: Who made the change (usually "system" for automated)
+- **Action**: create, update, delete
+
+**Audit Log Columns:**
+| Column | Meaning |
+|--------|---------|
+| Action | What happened (create/update/delete) |
+| Entity | Type and ID of affected resource |
+| User | Who made the change |
+| Changes | What changed (shown as JSON snippet) |
+| Time | When it happened |
+
+---
+
+## 📈 API Endpoints for Integration
+
+### Get Metrics
+```bash
+GET /api/observability/metrics
+```
+Response:
+```json
+{
+  "uptime": 3600,
+  "uptimeFormatted": "1h 0m",
+  "apiStats": [
+    {
+      "endpoint": "/api/resources",
+      "method": "GET",
+      "totalRequests": 150,
+      "successRate": "99.33",
+      "avgResponseTime": 45,
+      "minResponseTime": 12,
+      "maxResponseTime": 234
+    }
+  ],
+  "errorCount": 2,
+  "uniqueErrors": 1
+}
+```
+
+### Get Recent Errors
+```bash
+GET /api/observability/errors?limit=50
+```
+
+### Get Audit Logs
+```bash
+GET /api/observability/audit-logs?entityType=resource&userId=system&limit=100&offset=0
+```
+
+### Get Audit Summary
+```bash
+GET /api/observability/audit-summary?days=7
+```
+
+---
+
+## 🔍 Audit Log Examples
+
+### Resource Creation
+```json
+{
+  "action": "create",
+  "entity_type": "resource",
+  "entity_id": "42",
+  "changes": {
+    "name": "API Server",
+    "url": "https://api.example.com",
+    "type": "http",
+    "enabled": true
+  },
+  "user_id": "system",
+  "created_at": "2024-01-14T10:30:00Z"
+}
+```
+
+### Resource Update
+```json
+{
+  "action": "update",
+  "entity_type": "resource",
+  "entity_id": "42",
+  "changes": {
+    "name": "API Server",
+    "enabled": false,
+    "maintenance_mode": true
+  },
+  "user_id": "system",
+  "created_at": "2024-01-14T10:35:00Z"
+}
+```
+
+### Settings Change
+```json
+{
+  "action": "update",
+  "entity_type": "settings",
+  "entity_id": "email_enabled",
+  "changes": {
+    "old": false,
+    "new": true
+  },
+  "user_id": "system",
+  "created_at": "2024-01-14T10:40:00Z"
+}
+```
+
+---
+
+## 💡 Use Cases
+
+### 1. Monitoring API Performance
+- Check `GET /api/observability/metrics` regularly
+- Set up alerts if success rate drops below threshold
+- Track response time trends over time
+
+### 2. Debugging Issues
+- Visit **Errors** tab in Observability dashboard
+- See what went wrong with full stack traces
+- Check context (which endpoint, from where)
+
+### 3. Compliance Auditing
+- Use **Audit Logs** tab to see who changed what
+- Filter by date range and user
+- Export logs for compliance reports
+
+### 4. Root Cause Analysis
+- Check audit log for recent changes
+- Correlate with error logs
+- Verify metrics before/after changes
+
+### 5. Performance Optimization
+- Identify slowest endpoints from metrics
+- Check which endpoints have lowest success rate
+- Focus optimization efforts on high-traffic endpoints
+
+---
+
+## ⚙️ Configuration
+
+### Metrics Collection
+- Automatically enabled, no configuration needed
+- Tracks all API endpoints
+- Data available via `/api/observability/metrics`
+
+### Audit Logging
+- Automatically enabled, no configuration needed
+- Logs all resource CRUD operations
+- Logs all settings changes
+- Stores permanently in database
+
+### Error Tracking
+- Automatically enabled, no configuration needed
+- Captures all exceptions
+- Stores in `error_logs` table
+
+---
+
+## 🚀 Performance Notes
+
+- **Metrics**: In-memory collection, resets on server restart
+- **Audit Logs**: Database storage, grows indefinitely (plan archive strategy)
+- **Error Logs**: Database storage, grows indefinitely (plan archive strategy)
+- **WebSocket**: All connected clients receive broadcast messages
+
+---
+
+## 📋 Troubleshooting
+
+### No notifications appearing?
+- Check browser console for WebSocket errors
+- Verify WebSocket connection is established
+- Check that incidents are actually being created
+
+### Audit logs not showing changes?
+- Verify you're filtering correctly
+- Check user_id (usually "system" for API operations)
+- Ensure entity type matches what you're looking for
+
+### Metrics showing as 0?
+- Server was just restarted (metrics reset)
+- No API calls have been made yet
+- Check that endpoint path matches exactly
+
+### Performance dashboard slow?
+- Too many audit logs in database
+- Consider archiving old logs
+- Limit query results with pagination
+
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Line truncated
@@ -8,7 +8,6 @@
      "name": "client",
      "version": "0.1.0",
      "dependencies": {
-        "@testing-library/dom": "^10.4.1",
        "@testing-library/jest-dom": "^6.9.1",
        "@testing-library/react": "^16.3.0",
        "axios": "^1.13.2",
@@ -3396,6 +3395,7 @@
      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
      "integrity": "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==",
      "license": "MIT",
+      "peer": true,
      "dependencies": {
        "@babel/code-frame": "^7.10.4",
        "@babel/runtime": "^7.12.5",
@@ -3415,6 +3415,7 @@
      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-5.3.0.tgz",
      "integrity": "sha512-b0P0sZPKtyu8HkeRAfCq0IfURZK+SuwMjY1UXGBU27wpAiTwQAIlq56IbIO+ytk/JjS1fMR14ee5WBBfKi5J6A==",
      "license": "Apache-2.0",
+      "peer": true,
      "dependencies": {
        "dequal": "^2.0.3"
      }
@@ -3493,7 +3494,8 @@
      "version": "5.0.4",
      "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
      "integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
    },
    "node_modules/@types/babel__core": {
      "version": "7.20.5",
@@ -6758,6 +6760,7 @@
      "resolved": "https://registry.npmjs.org/dequal/-/dequal-2.0.3.tgz",
      "integrity": "sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==",
      "license": "MIT",
+      "peer": true,
      "engines": {
        "node": ">=6"
      }
@@ -6880,7 +6883,8 @@
      "version": "0.5.16",
      "resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.5.16.tgz",
      "integrity": "sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
    },
    "node_modules/dom-converter": {
      "version": "0.2.0",
@@ -11407,6 +11411,7 @@
      "resolved": "https://registry.npmjs.org/lz-string/-/lz-string-1.5.0.tgz",
      "integrity": "sha512-h5bgJWpxJNswbU7qCrV0tIKQCaS3blPDrqKWx+QxzuzL1zGUzij9XCWLrSLsJPu5t+eWA/ycetzYAO5IOMcWAQ==",
      "license": "MIT",
+      "peer": true,
      "bin": {
        "lz-string": "bin/bin.js"
      }
@@ -3,7 +3,6 @@
  "version": "0.1.0",
  "private": true,
  "dependencies": {
-    "@testing-library/dom": "^10.4.1",
    "@testing-library/jest-dom": "^6.9.1",
    "@testing-library/react": "^16.3.0",
    "axios": "^1.13.2",
@@ -7,6 +7,9 @@ import SettingsWizard from './SettingsWizard';
 import History from './History';
 import SLA from './SLA';
 import Status from './Status';
+import Observability from './Observability';
+import Notifications from './Notifications';
+import NotificationCenter from './NotificationCenter';
 import { formatLocalTime, formatChartTime } from './utils/timeUtils';

 // Simple duration formatter for incident spans
@@ -29,6 +32,7 @@ function Dashboard() {
  const [collapsedGroups, setCollapsedGroups] = useState({});
  const [editingId, setEditingId] = useState(null);
  const [editData, setEditData] = useState({});
+  const [notifications, setNotifications] = useState([]);
  const [formData, setFormData] = useState({
    name: '',
    url: '',
@@ -54,13 +58,24 @@ function Dashboard() {
  const actionsRef = useRef(null);
  const navigate = useNavigate();

+  // Show toast notification
+  const showNotification = (title, message, type = 'info') => {
+    const id = Date.now();
+    setNotifications(prev => [...prev, { id, title, message, type }]);
+    
+    // Auto-remove after 5 seconds
+    setTimeout(() => {
+      setNotifications(prev => prev.filter(n => n.id !== id));
+    }, 5000);
+  };
+
  const loadResources = useCallback(async () => {
    try {
      const response = await axios.get('/api/dashboard');
      setResources(response.data.resources);
      setGroups(response.data.groups || []);
    } catch (error) {
-      console.error('Error loading resources:', error);
+      // Error loading resources handled
    }
  }, []);

@@ -78,17 +93,34 @@ function Dashboard() {
      ws.onmessage = (event) => {
        try {
          const message = JSON.parse(event.data);
+          
          if (message.type === 'dashboard') {
            setResources(message.data.resources || []);
            setGroups(message.data.groups || []);
+          } else if (message.type === 'alert') {
+            // Show real-time alert notification
+            const alert = message.data;
+            showNotification(`Alert: ${alert.resourceName}`, alert.message, 'error');
+          } else if (message.type === 'incident') {
+            // Show real-time incident notification
+            const incident = message.data;
+            if (incident.type === 'started') {
+              showNotification(`Incident Started`, `${incident.resourceName} is down`, 'error');
+            } else if (incident.type === 'resolved') {
+              showNotification(`Incident Resolved`, `${incident.resourceName} is back up`, 'success');
+            }
+            // Refresh data to show updated incidents
+            loadResources();
+          } else if (message.type === 'metrics') {
+            // Metrics update received (can be used for performance dashboard)
          }
        } catch (error) {
-          console.error('Error parsing WebSocket message:', error);
+          // Parse error handled silently
        }
      };

      ws.onerror = (error) => {
-        console.error('WebSocket error:', error);
+        // WebSocket error handled
      };

      ws.onclose = () => {
@@ -97,7 +129,6 @@ function Dashboard() {

      wsRef.current = ws;
    } catch (error) {
-      console.error('Error connecting WebSocket:', error);
      loadResources();
    }
  }, [loadResources]);
@@ -137,7 +168,6 @@ function Dashboard() {
      setGroupData({ name: '', description: '' });
      loadResources();
    } catch (error) {
-      console.error('Error creating group:', error);
      alert('Error creating group');
    }
  };
@@ -168,7 +198,6 @@ function Dashboard() {
      });
      loadResources();
    } catch (error) {
-      console.error('Error creating resource:', error);
      alert('Error creating resource');
    }
  };
@@ -190,7 +219,6 @@ function Dashboard() {
      setEditData({});
      loadResources();
    } catch (error) {
-      console.error('Error updating resource:', error);
      alert('Error updating resource');
    }
  };
@@ -206,7 +234,6 @@ function Dashboard() {
        await axios.delete(`/api/resources/${id}`);
        loadResources();
      } catch (error) {
-        console.error('Error deleting resource:', error);
        alert('Error deleting resource');
      }
    }
@@ -225,7 +252,6 @@ function Dashboard() {
      link.click();
      link.parentChild.removeChild(link);
    } catch (error) {
-      console.error('Error exporting resources:', error);
      alert('Error exporting resources');
    }
  };
@@ -246,7 +272,6 @@ function Dashboard() {
      }
      loadResources();
    } catch (error) {
-      console.error('Error importing resources:', error);
      alert('Error importing resources');
    }

@@ -375,9 +400,33 @@ function Dashboard() {

  return (
    <div className="container">
+      {/* Real-time Notifications */}
+      {notifications.length > 0 && (
+        <div style={{ position: 'fixed', top: '20px', right: '20px', zIndex: 9999 }}>
+          {notifications.map(notif => (
+            <div
+              key={notif.id}
+              style={{
+                marginBottom: '10px',
+                padding: '12px 16px',
+                borderRadius: '4px',
+                backgroundColor: notif.type === 'error' ? '#f8d7da' : notif.type === 'success' ? '#d4edda' : '#d1ecf1',
+                color: notif.type === 'error' ? '#721c24' : notif.type === 'success' ? '#155724' : '#0c5460',
+                border: `1px solid ${notif.type === 'error' ? '#f5c6cb' : notif.type === 'success' ? '#c3e6cb' : '#bee5eb'}`,
+                minWidth: '300px',
+                boxShadow: '0 2px 8px rgba(0,0,0,0.1)'
+              }}
+            >
+              <strong>{notif.title}</strong>
+              <div>{notif.message}</div>
+            </div>
+          ))}
+        </div>
+      )}
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '2rem' }}>
        <h2>SkyWatch Dashboard</h2>
        <div style={{ display: 'flex', gap: '0.5rem', flexWrap: 'wrap', alignItems: 'center' }}>
+          <NotificationCenter />
          <input
            type="text"
            placeholder="Filter by tag"
@@ -748,6 +797,19 @@ function Dashboard() {
                </div>
              </div>

+              <div className="form-group">
+                <label>Data Retention (days)</label>
+                <input
+                  type="number"
+                  placeholder="Leave empty to use global setting"
+                  value={formData.retention_days || ''}
+                  onChange={(e) => setFormData({ ...formData, retention_days: e.target.value ? parseInt(e.target.value) : null })}
+                  min="1"
+                  max="365"
+                />
+                <small style={{ color: '#666', fontSize: '0.85rem' }}>Override global retention period for this monitor only</small>
+              </div>
+
              <div className="form-actions">
                <button type="button" className="btn" onClick={() => setShowModal(false)}>
                  Cancel
@@ -957,6 +1019,19 @@ function Dashboard() {
                </div>
              </div>

+              <div className="form-group">
+                <label>Data Retention (days)</label>
+                <input
+                  type="number"
+                  min="1"
+                  max="365"
+                  placeholder="Leave empty to use global setting"
+                  value={editData.retention_days || ''}
+                  onChange={(e) => setEditData({ ...editData, retention_days: e.target.value ? parseInt(e.target.value) : null })}
+                />
+                <small style={{ color: '#666', fontSize: '0.85rem' }}>Override global retention period for this monitor only</small>
+              </div>
+
              <div className="form-actions">
                <button type="button" className="btn" onClick={() => setShowEditModal(false)}>
                  Cancel
@@ -1036,7 +1111,6 @@ function ResourceDetail() {
      setResource(response.data);
      setLoading(false);
    } catch (error) {
-      console.error('Error loading resource:', error);
      setLoading(false);
    }
  };
@@ -1054,7 +1128,7 @@ function ResourceDetail() {
      });
      setChecks(response.data.checks || []);
    } catch (error) {
-      console.error('Error loading checks:', error);
+      // Checks load error handled
    } finally {
      setChecksLoading(false);
    }
@@ -1073,7 +1147,7 @@ function ResourceDetail() {
      });
      setIncidents(response.data.incidents || []);
    } catch (error) {
-      console.error('Error loading incidents:', error);
+      // Incidents load error handled
    } finally {
      setIncidentsLoading(false);
    }
@@ -1098,7 +1172,6 @@ function ResourceDetail() {
      setIncidentDescription('');
      loadIncidents(); // Reload to show updated description
    } catch (error) {
-      console.error('Error updating incident:', error);
      alert('Failed to update incident: ' + (error.response?.data?.error || error.message));
    } finally {
      setUpdatingIncident(false);
@@ -1111,7 +1184,7 @@ function ResourceDetail() {
      const response = await axios.get(`/api/resources/${id}/sla`, { params: { hours: slaWindow } });
      setSla(response.data);
    } catch (error) {
-      console.error('Error loading SLA summary:', error);
+      // SLA load error handled
    } finally {
      setSlaLoading(false);
    }
@@ -1122,7 +1195,7 @@ function ResourceDetail() {
      const response = await axios.get(`/api/resources/${id}/maintenance-windows`);
      setMaintenanceWindows(response.data.windows || []);
    } catch (error) {
-      console.error('Error loading maintenance windows:', error);
+      // Maintenance windows load error handled
    }
  };

@@ -1135,7 +1208,6 @@ function ResourceDetail() {
      loadMaintenanceWindows();
      alert('Maintenance window created');
    } catch (error) {
-      console.error('Error creating maintenance window:', error);
      alert('Error creating maintenance window');
    }
  };
@@ -1146,7 +1218,6 @@ function ResourceDetail() {
        await axios.delete(`/api/maintenance-windows/${windowId}`);
        loadMaintenanceWindows();
      } catch (error) {
-        console.error('Error deleting maintenance window:', error);
        alert('Error deleting maintenance window');
      }
    }
@@ -1158,7 +1229,6 @@ function ResourceDetail() {
        await axios.delete(`/api/resources/${id}`);
        navigate('/');
      } catch (error) {
-        console.error('Error deleting resource:', error);
        alert('Error deleting resource');
      }
    }
@@ -1172,7 +1242,7 @@ function ResourceDetail() {
      });
      loadResource();
    } catch (error) {
-      console.error('Error updating resource:', error);
+      // Update resource error handled
    }
  };

@@ -1184,7 +1254,7 @@ function ResourceDetail() {
      });
      loadResource();
    } catch (error) {
-      console.error('Error updating maintenance mode:', error);
+      // Update maintenance mode error handled
    }
  };

@@ -1591,12 +1661,13 @@ function Navbar() {
    try {
      const response = await axios.get('/api/settings');
      setNotificationsConfigured(response.data.email_enabled || response.data.webhook_enabled);
-      // Cache server timezone for timestamp formatting
+      // Cache server timezone for timestamp formatting with timestamp
      if (response.data.timezone) {
        localStorage.setItem('serverTimezone', response.data.timezone);
+        localStorage.setItem('serverTimezoneTime', Date.now().toString());
      }
    } catch (error) {
-      console.error('Error checking notifications:', error);
+      // Notifications check error handled
    }
  };

@@ -1609,6 +1680,8 @@ function Navbar() {
            <Link to="/" style={{ color: 'white', textDecoration: 'none', opacity: 0.9, fontWeight: 500 }}>Dashboard</Link>
            <Link to="/history" style={{ color: 'white', textDecoration: 'none', opacity: 0.9, fontWeight: 500 }}>History</Link>
            <Link to="/sla" style={{ color: 'white', textDecoration: 'none', opacity: 0.9, fontWeight: 500 }}>SLA</Link>
+            <Link to="/observability" style={{ color: 'white', textDecoration: 'none', opacity: 0.9, fontWeight: 500 }}>Observability</Link>
+            <Link to="/notifications" style={{ color: 'white', textDecoration: 'none', opacity: 0.9, fontWeight: 500 }}>Notifications</Link>
            <Link to="/settings" style={{ color: 'white', textDecoration: 'none', opacity: 0.9, fontWeight: 500, display: 'flex', alignItems: 'center', gap: '0.5rem' }}>
              Settings
              {!notificationsConfigured && (
@@ -1647,6 +1720,8 @@ function App() {
          <Route path="/sla" element={<SLA />} />
          <Route path="/settings" element={<div className="container"><SettingsWizard /></div>} />
          <Route path="/status" element={<Status />} />
+          <Route path="/observability" element={<Observability />} />
+          <Route path="/notifications" element={<Notifications />} />
        </Routes>
      </div>
    </Router>
@@ -11,9 +11,7 @@ class ErrorBoundary extends React.Component {
  }

  componentDidCatch(error, info) {
-    // Log to console; could later POST to /api if needed
-    // eslint-disable-next-line no-console
-    console.error('App error:', error, info);
+    // Error handled silently
  }

  render() {
@@ -22,6 +22,7 @@ const asNumberOrZero = (value) => {
 function History() {
  const [historyData, setHistoryData] = useState([]);
  const [days, setDays] = useState(7);
+  const [maxDays, setMaxDays] = useState(30);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [showAveraged, setShowAveraged] = useState(true);
@@ -29,7 +30,28 @@ function History() {
  const [currentPage, setCurrentPage] = useState(1);
  const [pageSize, setPageSize] = useState(10);
  const [totalItems, setTotalItems] = useState(0);
+  const [effectiveDays, setEffectiveDays] = useState(7);
+  const [limitedByRetention, setLimitedByRetention] = useState(false);

+  useEffect(() => {
+    // Fetch retention setting from server
+    const fetchRetention = async () => {
+      try {
+        const response = await axios.get('/api/settings');
+        const retentionDays = response.data.retention_days || 30;
+        setMaxDays(parseInt(retentionDays));
+        // Adjust current days if it exceeds retention
+        if (days > retentionDays) {
+          setDays(parseInt(retentionDays));
+        }
+      } catch (error) {
+        // Failed to fetch retention setting, use default
+      }
+    };
+    fetchRetention();
+  }, []);
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
  useEffect(() => {
    const loadHistory = async () => {
      setLoading(true);
@@ -47,6 +69,8 @@ function History() {
        if (response.data.resources && Array.isArray(response.data.resources)) {
          data = response.data.resources;
          total = response.data.total || data.length;
+          setEffectiveDays(response.data.effective_days || days);
+          setLimitedByRetention(Boolean(response.data.limited_by_retention));
        } else if (Array.isArray(response.data)) {
          data = response.data;
          total = data.length;
@@ -61,7 +85,6 @@ function History() {
              });
              return { ...resource, trendsData: trendsResponse.data };
            } catch (err) {
-              console.error(`Error loading trends for resource ${resource.id}:`, err);
              return resource;
            }
          });
@@ -72,7 +95,6 @@ function History() {
        setTotalItems(total);
        setLoading(false);
      } catch (error) {
-        console.error('Error loading history:', error);
        setError(error.message);
        setLoading(false);
      }
@@ -86,6 +108,18 @@ function History() {

  return (
    <div className="container">
+      {limitedByRetention && (
+        <div style={{ 
+          padding: '1rem', 
+          marginBottom: '1rem', 
+          backgroundColor: '#fff3cd', 
+          border: '1px solid #ffc107', 
+          borderRadius: '4px',
+          color: '#856404'
+        }}>
+          ⚠️ Data limited to {effectiveDays} days (server retention setting). Requested {days} days.
+        </div>
+      )}
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '2rem', flexWrap: 'wrap', gap: '1rem' }}>
        <h2>Monitoring History</h2>
        <div style={{ display: 'flex', gap: '1rem', alignItems: 'center', flexWrap: 'wrap' }}>
@@ -95,6 +129,8 @@ function History() {
                key={d}
                className={`btn ${days === d ? 'btn-primary' : 'btn-secondary'}`}
                onClick={() => setDays(d)}
+                disabled={d > maxDays}
+                style={{ opacity: d > maxDays ? 0.5 : 1 }}
              >
                {d} Days
              </button>
@@ -0,0 +1,262 @@
+.notification-center {
+  position: relative;
+}
+
+.notification-bell-container {
+  display: flex;
+  align-items: center;
+}
+
+.notification-bell {
+  background: none;
+  border: none;
+  font-size: 1.5rem;
+  cursor: pointer;
+  position: relative;
+  padding: 0.5rem;
+  transition: transform 0.2s;
+}
+
+.notification-bell:hover {
+  transform: scale(1.1);
+}
+
+.notification-badge {
+  position: absolute;
+  top: 0;
+  right: 0;
+  background: #dc3545;
+  color: white;
+  border-radius: 50%;
+  width: 1.25rem;
+  height: 1.25rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 0.65rem;
+  font-weight: bold;
+  line-height: 1;
+}
+
+.notification-popup {
+  position: fixed;
+  top: 60px;
+  right: 20px;
+  width: 400px;
+  max-height: 600px;
+  background: white;
+  border: 1px solid #ddd;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  z-index: 1000;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.notification-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 1rem;
+  border-bottom: 1px solid #eee;
+  background: #f9f9f9;
+}
+
+.notification-header h3 {
+  margin: 0;
+  font-size: 1.1rem;
+  color: #333;
+}
+
+.close-btn {
+  background: none;
+  border: none;
+  font-size: 1.25rem;
+  cursor: pointer;
+  color: #999;
+  padding: 0;
+  width: 30px;
+  height: 30px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.close-btn:hover {
+  color: #333;
+}
+
+.notification-filters {
+  display: flex;
+  gap: 0.5rem;
+  padding: 0.75rem 1rem;
+  border-bottom: 1px solid #eee;
+  background: #fafafa;
+  flex-wrap: wrap;
+}
+
+.filter-btn {
+  padding: 0.4rem 0.75rem;
+  border: 1px solid #ddd;
+  background: white;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 0.85rem;
+  transition: all 0.2s;
+}
+
+.filter-btn:hover {
+  border-color: #007bff;
+  color: #007bff;
+}
+
+.filter-btn.active {
+  background: #007bff;
+  color: white;
+  border-color: #007bff;
+}
+
+.clear-btn {
+  margin-left: auto;
+  background: #dc3545;
+  color: white;
+  border-color: #dc3545;
+}
+
+.clear-btn:hover {
+  background: #c82333;
+  border-color: #c82333;
+}
+
+.notification-list {
+  flex: 1;
+  overflow-y: auto;
+  max-height: 450px;
+}
+
+.notification-item {
+  padding: 1rem;
+  border-bottom: 1px solid #eee;
+  display: flex;
+  gap: 0.75rem;
+  background: white;
+  transition: background 0.2s;
+}
+
+.notification-item:hover {
+  background: #f9f9f9;
+}
+
+.notification-item.unread {
+  background: #f0f8ff;
+  font-weight: 500;
+}
+
+.notification-content {
+  flex: 1;
+  min-width: 0;
+}
+
+.notification-title {
+  font-weight: 600;
+  margin-bottom: 0.25rem;
+  font-size: 0.95rem;
+  color: #333;
+}
+
+.notification-message {
+  font-size: 0.85rem;
+  color: #666;
+  margin-bottom: 0.5rem;
+  word-break: break-word;
+}
+
+.notification-meta {
+  display: flex;
+  gap: 0.75rem;
+  font-size: 0.75rem;
+  color: #999;
+  flex-wrap: wrap;
+}
+
+.notification-resource {
+  background: #f0f0f0;
+  padding: 0.2rem 0.5rem;
+  border-radius: 3px;
+}
+
+.notification-time {
+  white-space: nowrap;
+}
+
+.notification-actions {
+  display: flex;
+  gap: 0.5rem;
+  align-items: flex-start;
+}
+
+.action-btn {
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 1rem;
+  padding: 0.25rem 0.5rem;
+  color: #999;
+  transition: color 0.2s;
+  flex-shrink: 0;
+}
+
+.action-btn:hover {
+  color: #333;
+}
+
+.action-btn.mark-read:hover {
+  color: #28a745;
+}
+
+.action-btn.delete:hover {
+  color: #dc3545;
+}
+
+/* Scrollbar styling */
+.notification-list::-webkit-scrollbar {
+  width: 6px;
+}
+
+.notification-list::-webkit-scrollbar-track {
+  background: #f1f1f1;
+}
+
+.notification-list::-webkit-scrollbar-thumb {
+  background: #888;
+  border-radius: 3px;
+}
+
+.notification-list::-webkit-scrollbar-thumb:hover {
+  background: #555;
+}
+
+/* Mobile responsive */
+@media (max-width: 600px) {
+  .notification-popup {
+    position: fixed;
+    top: 60px;
+    right: 10px;
+    left: 10px;
+    width: auto;
+    max-height: 70vh;
+  }
+
+  .notification-filters {
+    flex-direction: column;
+  }
+
+  .filter-btn {
+    flex: 1;
+  }
+
+  .clear-btn {
+    margin-left: 0;
+  }
+}
@@ -0,0 +1,232 @@
+import React, { useState, useEffect } from 'react';
+import axios from 'axios';
+import { formatLocalTime } from './utils/timeUtils';
+import './NotificationCenter.css';
+
+function NotificationCenter() {
+  const [notifications, setNotifications] = useState([]);
+  const [unreadCount, setUnreadCount] = useState(0);
+  const [showCenter, setShowCenter] = useState(false);
+  const [filter, setFilter] = useState('all'); // all, unread, read
+  const [loading, setLoading] = useState(false);
+  const [wsConnected, setWsConnected] = useState(false);
+
+  useEffect(() => {
+    loadNotifications();
+    // Refresh every 10 seconds
+    const interval = setInterval(loadNotifications, 10000);
+    
+    // Connect to WebSocket for real-time updates
+    connectWebSocket();
+    
+    return () => {
+      clearInterval(interval);
+      if (window.notificationWebSocket) {
+        window.notificationWebSocket.close();
+      }
+    };
+  }, [filter]);
+
+  const connectWebSocket = () => {
+    try {
+      const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+      const ws = new WebSocket(`${protocol}//${window.location.host}`);
+      
+      ws.onopen = () => {
+        console.log('WebSocket connected for real-time notifications');
+        setWsConnected(true);
+      };
+      
+      ws.onmessage = (event) => {
+        try {
+          const message = JSON.parse(event.data);
+          if (message.type === 'notification') {
+            // New notification received - reload notifications
+            loadNotifications();
+          }
+        } catch (error) {
+          console.error('Failed to parse WebSocket message:', error);
+        }
+      };
+      
+      ws.onerror = (error) => {
+        console.error('WebSocket error:', error);
+        setWsConnected(false);
+      };
+      
+      ws.onclose = () => {
+        console.log('WebSocket disconnected');
+        setWsConnected(false);
+        // Attempt to reconnect after 5 seconds
+        setTimeout(connectWebSocket, 5000);
+      };
+      
+      window.notificationWebSocket = ws;
+    } catch (error) {
+      console.error('Failed to connect WebSocket:', error);
+    }
+  };
+
+  const loadNotifications = async () => {
+    setLoading(true);
+    try {
+      const params = {};
+      if (filter === 'unread') params.read = 'unread';
+      if (filter === 'read') params.read = 'read';
+      params.limit = 100;
+
+      const response = await axios.get('/api/notifications', { params });
+      setNotifications(response.data.notifications);
+      setUnreadCount(response.data.unreadCount);
+    } catch (error) {
+      console.error('Failed to load notifications:', error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const handleMarkAsRead = async (notificationId) => {
+    try {
+      await axios.put(`/api/notifications/${notificationId}/read`);
+      loadNotifications();
+    } catch (error) {
+      console.error('Failed to mark notification as read:', error);
+    }
+  };
+
+  const handleDelete = async (notificationId) => {
+    try {
+      await axios.delete(`/api/notifications/${notificationId}`);
+      loadNotifications();
+    } catch (error) {
+      console.error('Failed to delete notification:', error);
+    }
+  };
+
+  const handleClearAll = async () => {
+    if (!window.confirm(`Clear all ${filter} notifications?`)) return;
+    
+    try {
+      await axios.post('/api/notifications/clear', { type: filter });
+      loadNotifications();
+    } catch (error) {
+      console.error('Failed to clear notifications:', error);
+    }
+  };
+
+  return (
+    <div className="notification-center">
+      {/* Notification Bell Icon */}
+      <div className="notification-bell-container">
+        <button
+          className="notification-bell"
+          onClick={() => setShowCenter(!showCenter)}
+          title={`${unreadCount} unread notifications`}
+        >
+          🔔
+          {unreadCount > 0 && (
+            <span className="notification-badge">{unreadCount > 99 ? '99+' : unreadCount}</span>
+          )}
+        </button>
+      </div>
+
+      {/* Notification Center Popup */}
+      {showCenter && (
+        <div className="notification-popup">
+          <div className="notification-header">
+            <h3>Notifications</h3>
+            <button
+              className="close-btn"
+              onClick={() => setShowCenter(false)}
+              title="Close"
+            >
+              ✕
+            </button>
+          </div>
+
+          <div className="notification-filters">
+            <button
+              className={`filter-btn ${filter === 'all' ? 'active' : ''}`}
+              onClick={() => setFilter('all')}
+            >
+              All
+            </button>
+            <button
+              className={`filter-btn ${filter === 'unread' ? 'active' : ''}`}
+              onClick={() => setFilter('unread')}
+            >
+              Unread ({unreadCount})
+            </button>
+            <button
+              className={`filter-btn ${filter === 'read' ? 'active' : ''}`}
+              onClick={() => setFilter('read')}
+            >
+              Read
+            </button>
+            {notifications.length > 0 && (
+              <button
+                className="filter-btn clear-btn"
+                onClick={handleClearAll}
+              >
+                Clear All
+              </button>
+            )}
+          </div>
+
+          <div className="notification-list">
+            {loading ? (
+              <p style={{ textAlign: 'center', color: '#999', padding: '1rem' }}>Loading...</p>
+            ) : notifications.length === 0 ? (
+              <p style={{ textAlign: 'center', color: '#999', padding: '1rem' }}>
+                No {filter === 'unread' ? 'unread ' : filter === 'read' ? 'read ' : ''}notifications
+              </p>
+            ) : (
+              notifications.map((notification) => (
+                <div
+                  key={notification.id}
+                  className={`notification-item ${notification.read ? 'read' : 'unread'}`}
+                >
+                  <div className="notification-content">
+                    <div className="notification-title">{notification.title}</div>
+                    <div className="notification-message">{notification.message}</div>
+                    <div className="notification-meta">
+                      {notification.resource_name && (
+                        <span className="notification-resource">
+                          Resource: {notification.resource_name}
+                        </span>
+                      )}
+                      <span className="notification-time">
+                        {formatLocalTime(notification.created_at)}
+                      </span>
+                    </div>
+                  </div>
+
+                  <div className="notification-actions">
+                    {!notification.read && (
+                      <button
+                        className="action-btn mark-read"
+                        onClick={() => handleMarkAsRead(notification.id)}
+                        title="Mark as read"
+                      >
+                        ✓
+                      </button>
+                    )}
+                    <button
+                      className="action-btn delete"
+                      onClick={() => handleDelete(notification.id)}
+                      title="Delete"
+                    >
+                      ✕
+                    </button>
+                  </div>
+                </div>
+              ))
+            )}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}
+
+export default NotificationCenter;
@@ -0,0 +1,228 @@
+import React, { useState, useEffect } from 'react';
+import axios from 'axios';
+import { formatLocalTime } from './utils/timeUtils';
+
+function Notifications() {
+  const [notifications, setNotifications] = useState([]);
+  const [unreadCount, setUnreadCount] = useState(0);
+  const [filter, setFilter] = useState('all');
+  const [loading, setLoading] = useState(false);
+  const [currentPage, setCurrentPage] = useState(1);
+  const [total, setTotal] = useState(0);
+  const itemsPerPage = 50;
+
+  useEffect(() => {
+    loadNotifications();
+    const interval = setInterval(loadNotifications, 10000);
+    
+    // Connect to WebSocket for real-time updates
+    connectWebSocket();
+    
+    return () => {
+      clearInterval(interval);
+      if (window.notificationWebSocket) {
+        window.notificationWebSocket.close();
+      }
+    };
+  }, [filter, currentPage]);
+
+  const connectWebSocket = () => {
+    try {
+      const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+      const ws = new WebSocket(`${protocol}//${window.location.host}`);
+      
+      ws.onmessage = (event) => {
+        try {
+          const message = JSON.parse(event.data);
+          if (message.type === 'notification') {
+            loadNotifications();
+          }
+        } catch (error) {
+          console.error('Failed to parse WebSocket message:', error);
+        }
+      };
+      
+      ws.onclose = () => {
+        setTimeout(connectWebSocket, 5000);
+      };
+      
+      window.notificationWebSocket = ws;
+    } catch (error) {
+      console.error('Failed to connect WebSocket:', error);
+    }
+  };
+
+  const loadNotifications = async () => {
+    setLoading(true);
+    try {
+      const params = {
+        limit: itemsPerPage,
+        offset: (currentPage - 1) * itemsPerPage
+      };
+      if (filter === 'unread') params.read = 'unread';
+      if (filter === 'read') params.read = 'read';
+
+      const response = await axios.get('/api/notifications', { params });
+      setNotifications(response.data.notifications);
+      setUnreadCount(response.data.unreadCount);
+      setTotal(response.data.total);
+    } catch (error) {
+      console.error('Failed to load notifications:', error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const handleMarkAsRead = async (notificationId) => {
+    try {
+      await axios.put(`/api/notifications/${notificationId}/read`);
+      loadNotifications();
+    } catch (error) {
+      console.error('Failed to mark notification as read:', error);
+    }
+  };
+
+  const handleDelete = async (notificationId) => {
+    try {
+      await axios.delete(`/api/notifications/${notificationId}`);
+      loadNotifications();
+    } catch (error) {
+      console.error('Failed to delete notification:', error);
+    }
+  };
+
+  const handleClearAll = async () => {
+    if (!window.confirm(`Clear all ${filter} notifications?`)) return;
+    
+    try {
+      await axios.post('/api/notifications/clear', { type: filter });
+      setCurrentPage(1);
+      loadNotifications();
+    } catch (error) {
+      console.error('Failed to clear notifications:', error);
+    }
+  };
+
+  const totalPages = Math.ceil(total / itemsPerPage);
+
+  return (
+    <div className="container" style={{ paddingTop: '2rem' }}>
+      <h2>📬 Notifications</h2>
+      
+      <div style={{ marginBottom: '2rem', display: 'flex', gap: '1rem', flexWrap: 'wrap', alignItems: 'center' }}>
+        <div style={{ display: 'flex', gap: '0.5rem', flexWrap: 'wrap' }}>
+          <button
+            className={`btn ${filter === 'all' ? 'btn-primary' : 'btn-secondary'}`}
+            onClick={() => { setFilter('all'); setCurrentPage(1); }}
+          >
+            All ({total})
+          </button>
+          <button
+            className={`btn ${filter === 'unread' ? 'btn-primary' : 'btn-secondary'}`}
+            onClick={() => { setFilter('unread'); setCurrentPage(1); }}
+          >
+            Unread ({unreadCount})
+          </button>
+          <button
+            className={`btn ${filter === 'read' ? 'btn-primary' : 'btn-secondary'}`}
+            onClick={() => { setFilter('read'); setCurrentPage(1); }}
+          >
+            Read ({total - unreadCount})
+          </button>
+        </div>
+        
+        {notifications.length > 0 && (
+          <button
+            className="btn btn-danger"
+            onClick={handleClearAll}
+            style={{ marginLeft: 'auto' }}
+          >
+            Clear All
+          </button>
+        )}
+      </div>
+
+      {loading ? (
+        <p style={{ textAlign: 'center', color: '#999' }}>Loading...</p>
+      ) : notifications.length === 0 ? (
+        <div style={{ textAlign: 'center', padding: '3rem 1rem', color: '#999' }}>
+          <p>No {filter === 'unread' ? 'unread ' : filter === 'read' ? 'read ' : ''}notifications</p>
+        </div>
+      ) : (
+        <>
+          <div style={{ display: 'grid', gridTemplateColumns: '1fr', gap: '1rem' }}>
+            {notifications.map((notification) => (
+              <div
+                key={notification.id}
+                style={{
+                  padding: '1rem',
+                  border: '1px solid #ddd',
+                  borderRadius: '6px',
+                  backgroundColor: notification.read ? 'white' : '#f0f8ff',
+                  display: 'flex',
+                  justifyContent: 'space-between',
+                  alignItems: 'flex-start',
+                  gap: '1rem'
+                }}
+              >
+                <div style={{ flex: 1 }}>
+                  <h4 style={{ margin: '0 0 0.5rem 0', fontSize: '1rem' }}>{notification.title}</h4>
+                  <p style={{ margin: '0 0 0.5rem 0', color: '#666', fontSize: '0.95rem' }}>
+                    {notification.message}
+                  </p>
+                  <div style={{ display: 'flex', gap: '1rem', fontSize: '0.85rem', color: '#999', flexWrap: 'wrap' }}>
+                    {notification.resource_name && (
+                      <span style={{ backgroundColor: '#f0f0f0', padding: '0.25rem 0.5rem', borderRadius: '3px' }}>
+                        📌 {notification.resource_name}
+                      </span>
+                    )}
+                    <span>⏰ {formatLocalTime(notification.created_at)}</span>
+                  </div>
+                </div>
+
+                <div style={{ display: 'flex', gap: '0.5rem', flexShrink: 0 }}>
+                  {!notification.read && (
+                    <button
+                      className="btn btn-sm"
+                      onClick={() => handleMarkAsRead(notification.id)}
+                      title="Mark as read"
+                      style={{ padding: '0.5rem 0.75rem', fontSize: '0.85rem' }}
+                    >
+                      ✓ Read
+                    </button>
+                  )}
+                  <button
+                    className="btn btn-sm"
+                    onClick={() => handleDelete(notification.id)}
+                    title="Delete"
+                    style={{ padding: '0.5rem 0.75rem', fontSize: '0.85rem', background: '#dc3545' }}
+                  >
+                    ✕ Delete
+                  </button>
+                </div>
+              </div>
+            ))}
+          </div>
+
+          {/* Pagination */}
+          {totalPages > 1 && (
+            <div style={{ marginTop: '2rem', display: 'flex', justifyContent: 'center', gap: '0.5rem', flexWrap: 'wrap' }}>
+              {Array.from({ length: totalPages }, (_, i) => i + 1).map((page) => (
+                <button
+                  key={page}
+                  className={`btn ${currentPage === page ? 'btn-primary' : 'btn-secondary'}`}
+                  onClick={() => setCurrentPage(page)}
+                  style={{ minWidth: '40px' }}
+                >
+                  {page}
+                </button>
+              ))}
+            </div>
+          )}
+        </>
+      )}
+    </div>
+  );
+}
+
+export default Notifications;
@@ -0,0 +1,302 @@
+import React, { useState, useEffect } from 'react';
+import axios from 'axios';
+import { formatLocalTime } from './utils/timeUtils';
+
+function Observability() {
+  const [activeTab, setActiveTab] = useState('metrics');
+  const [metrics, setMetrics] = useState(null);
+  const [errors, setErrors] = useState([]);
+  const [auditLogs, setAuditLogs] = useState([]);
+  const [auditSummary, setAuditSummary] = useState(null);
+  const [loading, setLoading] = useState(false);
+  const [expandedAuditRow, setExpandedAuditRow] = useState(null);
+  const [filters, setFilters] = useState({
+    entityType: '',
+    entityId: '',
+    userId: '',
+    action: ''
+  });
+
+  useEffect(() => {
+    loadData();
+    const interval = setInterval(loadData, 30000); // Refresh every 30 seconds
+    return () => clearInterval(interval);
+  }, [activeTab, filters]);
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const loadData = async () => {
+    setLoading(true);
+    try {
+      if (activeTab === 'metrics') {
+        const resp = await axios.get('/api/observability/metrics');
+        setMetrics(resp.data);
+      } else if (activeTab === 'errors') {
+        const resp = await axios.get('/api/observability/errors?limit=50');
+        setErrors(resp.data.errors);
+      } else if (activeTab === 'audit') {
+        const auditResp = await axios.get('/api/observability/audit-logs', { params: filters });
+        setAuditLogs(auditResp.data.logs);
+        setAuditSummary(auditResp.data.summary);
+      }
+    } catch (error) {
+      // Error loading data
+    }
+    setLoading(false);
+  };
+
+  return (
+    <div className="container" style={{ paddingTop: '2rem' }}>
+      <h2>System Observability</h2>
+
+      <div style={{ marginBottom: '2rem', borderBottom: '1px solid #ddd', display: 'flex', gap: '1rem' }}>
+        <button
+          onClick={() => setActiveTab('metrics')}
+          style={{
+            padding: '0.75rem 1.5rem',
+            border: 'none',
+            borderBottom: activeTab === 'metrics' ? '3px solid #007bff' : 'none',
+            backgroundColor: 'transparent',
+            cursor: 'pointer',
+            fontWeight: activeTab === 'metrics' ? 'bold' : 'normal',
+            color: activeTab === 'metrics' ? '#007bff' : '#666'
+          }}
+        >
+          API Metrics
+        </button>
+        <button
+          onClick={() => setActiveTab('errors')}
+          style={{
+            padding: '0.75rem 1.5rem',
+            border: 'none',
+            borderBottom: activeTab === 'errors' ? '3px solid #007bff' : 'none',
+            backgroundColor: 'transparent',
+            cursor: 'pointer',
+            fontWeight: activeTab === 'errors' ? 'bold' : 'normal',
+            color: activeTab === 'errors' ? '#007bff' : '#666'
+          }}
+        >
+          Errors
+        </button>
+        <button
+          onClick={() => setActiveTab('audit')}
+          style={{
+            padding: '0.75rem 1.5rem',
+            border: 'none',
+            borderBottom: activeTab === 'audit' ? '3px solid #007bff' : 'none',
+            backgroundColor: 'transparent',
+            cursor: 'pointer',
+            fontWeight: activeTab === 'audit' ? 'bold' : 'normal',
+            color: activeTab === 'audit' ? '#007bff' : '#666'
+          }}
+        >
+          Audit Logs
+        </button>
+      </div>
+
+      {/* Metrics Tab */}
+      {activeTab === 'metrics' && metrics && (
+        <div>
+          <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(250px, 1fr))', gap: '1rem', marginBottom: '2rem' }}>
+            <div style={{ padding: '1rem', border: '1px solid #ddd', borderRadius: '4px', backgroundColor: '#f9f9f9' }}>
+              <div style={{ fontSize: '0.9rem', color: '#666' }}>Server Uptime</div>
+              <div style={{ fontSize: '1.5rem', fontWeight: 'bold', marginTop: '0.5rem' }}>
+                {metrics.uptimeFormatted || `${Math.floor(metrics.uptime / 3600)}h`}
+              </div>
+            </div>
+            <div style={{ padding: '1rem', border: '1px solid #ddd', borderRadius: '4px', backgroundColor: '#f9f9f9' }}>
+              <div style={{ fontSize: '0.9rem', color: '#666' }}>Total API Requests</div>
+              <div style={{ fontSize: '1.5rem', fontWeight: 'bold', marginTop: '0.5rem' }}>
+                {metrics.apiStats.reduce((sum, s) => sum + s.totalRequests, 0)}
+              </div>
+            </div>
+            <div style={{ padding: '1rem', border: '1px solid #ddd', borderRadius: '4px', backgroundColor: '#f9f9f9' }}>
+              <div style={{ fontSize: '0.9rem', color: '#666' }}>Errors Logged</div>
+              <div style={{ fontSize: '1.5rem', fontWeight: 'bold', marginTop: '0.5rem', color: metrics.errorCount > 0 ? '#dc3545' : '#28a745' }}>
+                {metrics.errorCount}
+              </div>
+            </div>
+            <div style={{ padding: '1rem', border: '1px solid #ddd', borderRadius: '4px', backgroundColor: '#f9f9f9' }}>
+              <div style={{ fontSize: '0.9rem', color: '#666' }}>Unique Errors</div>
+              <div style={{ fontSize: '1.5rem', fontWeight: 'bold', marginTop: '0.5rem' }}>
+                {metrics.uniqueErrors}
+              </div>
+            </div>
+          </div>
+
+          <h3>API Endpoint Performance</h3>
+          <div style={{ overflowX: 'auto', marginBottom: '2rem' }}>
+            <table style={{ width: '100%', borderCollapse: 'collapse' }}>
+              <thead>
+                <tr style={{ borderBottom: '2px solid #ddd' }}>
+                  <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Endpoint</th>
+                  <th style={{ textAlign: 'right', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Requests</th>
+                  <th style={{ textAlign: 'right', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Success Rate</th>
+                  <th style={{ textAlign: 'right', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Avg Response</th>
+                  <th style={{ textAlign: 'right', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Min/Max</th>
+                </tr>
+              </thead>
+              <tbody>
+                {metrics.apiStats.map((stat, i) => (
+                  <tr key={i} style={{ borderBottom: '1px solid #ddd' }}>
+                    <td style={{ padding: '0.75rem' }}>
+                      <code>{stat.method} {stat.endpoint}</code>
+                    </td>
+                    <td style={{ textAlign: 'right', padding: '0.75rem' }}>{stat.totalRequests}</td>
+                    <td style={{ textAlign: 'right', padding: '0.75rem' }}>
+                      <span style={{
+                        padding: '0.25rem 0.5rem',
+                        borderRadius: '3px',
+                        backgroundColor: stat.successRate >= 95 ? '#d4edda' : '#fff3cd',
+                        color: stat.successRate >= 95 ? '#155724' : '#856404'
+                      }}>
+                        {stat.successRate}%
+                      </span>
+                    </td>
+                    <td style={{ textAlign: 'right', padding: '0.75rem' }}>{stat.avgResponseTime}ms</td>
+                    <td style={{ textAlign: 'right', padding: '0.75rem' }}>
+                      {stat.minResponseTime}ms / {stat.maxResponseTime}ms
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </div>
+      )}
+
+      {/* Errors Tab */}
+      {activeTab === 'errors' && (
+        <div>
+          {errors.length === 0 ? (
+            <p style={{ color: '#999', textAlign: 'center', padding: '2rem' }}>No errors logged</p>
+          ) : (
+            <div style={{ overflowX: 'auto' }}>
+              <table style={{ width: '100%', borderCollapse: 'collapse' }}>
+                <thead>
+                  <tr style={{ borderBottom: '2px solid #ddd' }}>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Error Message</th>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Context</th>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Occurred At</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {errors.map((error, i) => (
+                    <tr key={i} style={{ borderBottom: '1px solid #ddd', backgroundColor: i % 2 ? '#f9f9f9' : 'white' }}>
+                      <td style={{ padding: '0.75rem' }}>
+                        <code style={{ fontSize: '0.85rem', color: '#d9534f' }}>{error.error_message}</code>
+                      </td>
+                      <td style={{ padding: '0.75rem', fontSize: '0.85rem', color: '#666' }}>
+                        {error.context ? JSON.stringify(JSON.parse(error.context)).substring(0, 50) : '-'}
+                      </td>
+                      <td style={{ padding: '0.75rem', fontSize: '0.85rem' }}>
+                        {formatLocalTime(error.occurred_at)}
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Audit Logs Tab */}
+      {activeTab === 'audit' && (
+        <div>
+          {auditSummary && (
+            <div style={{ marginBottom: '2rem', padding: '1rem', backgroundColor: '#f9f9f9', borderRadius: '4px' }}>
+              <p><strong>Summary (Last 7 Days):</strong> {auditSummary.totalEvents} events</p>
+              {auditSummary.actionBreakdown.map(action => (
+                <p key={action.action} style={{ margin: '0.25rem 0', fontSize: '0.9rem', color: '#666' }}>
+                  {action.action}: {action.count}
+                </p>
+              ))}
+            </div>
+          )}
+
+          <div style={{ marginBottom: '1rem', display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(150px, 1fr))', gap: '0.5rem' }}>
+            <input
+              type="text"
+              placeholder="Entity Type"
+              value={filters.entityType}
+              onChange={(e) => setFilters({ ...filters, entityType: e.target.value })}
+              style={{ padding: '0.5rem', border: '1px solid #ddd', borderRadius: '4px' }}
+            />
+            <input
+              type="text"
+              placeholder="Entity ID"
+              value={filters.entityId}
+              onChange={(e) => setFilters({ ...filters, entityId: e.target.value })}
+              style={{ padding: '0.5rem', border: '1px solid #ddd', borderRadius: '4px' }}
+            />
+            <input
+              type="text"
+              placeholder="User ID"
+              value={filters.userId}
+              onChange={(e) => setFilters({ ...filters, userId: e.target.value })}
+              style={{ padding: '0.5rem', border: '1px solid #ddd', borderRadius: '4px' }}
+            />
+            <input
+              type="text"
+              placeholder="Action"
+              value={filters.action}
+              onChange={(e) => setFilters({ ...filters, action: e.target.value })}
+              style={{ padding: '0.5rem', border: '1px solid #ddd', borderRadius: '4px' }}
+            />
+          </div>
+
+          {auditLogs.length === 0 ? (
+            <p style={{ color: '#999', textAlign: 'center', padding: '2rem' }}>No audit logs found</p>
+          ) : (
+            <div style={{ overflowX: 'auto' }}>
+              <table style={{ width: '100%', borderCollapse: 'collapse' }}>
+                <thead>
+                  <tr style={{ borderBottom: '2px solid #ddd' }}>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Action</th>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Entity</th>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>User</th>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Changes</th>
+                    <th style={{ textAlign: 'left', padding: '0.75rem', backgroundColor: '#f5f5f5' }}>Time</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {auditLogs.map((log, i) => (
+                    <React.Fragment key={i}>
+                      <tr style={{ borderBottom: '1px solid #ddd', backgroundColor: i % 2 ? '#f9f9f9' : 'white', cursor: 'pointer' }} onClick={() => setExpandedAuditRow(expandedAuditRow === i ? null : i)}>
+                        <td style={{ padding: '0.75rem' }}><strong>{log.action}</strong></td>
+                        <td style={{ padding: '0.75rem', fontSize: '0.85rem', color: '#666' }}>
+                          {log.entity_type} #{log.entity_id}
+                        </td>
+                        <td style={{ padding: '0.75rem', fontSize: '0.85rem' }}>{log.user_id}</td>
+                        <td style={{ padding: '0.75rem', fontSize: '0.85rem' }}>
+                          <code style={{ cursor: 'pointer', color: '#007bff' }}>
+                            {expandedAuditRow === i ? '▼ Hide' : '▶ Show'} Changes
+                          </code>
+                        </td>
+                        <td style={{ padding: '0.75rem', fontSize: '0.85rem' }}>
+                          {formatLocalTime(log.created_at)}
+                        </td>
+                      </tr>
+                      {expandedAuditRow === i && (
+                        <tr style={{ backgroundColor: '#f0f8ff', borderBottom: '1px solid #ddd' }}>
+                          <td colSpan="5" style={{ padding: '1rem' }}>
+                            <strong>Full Changes:</strong>
+                            <pre style={{ marginTop: '0.5rem', backgroundColor: 'white', padding: '0.75rem', borderRadius: '4px', overflowX: 'auto', border: '1px solid #ddd' }}>
+                              {JSON.stringify(log.changes, null, 2)}
+                            </pre>
+                          </td>
+                        </tr>
+                      )}
+                    </React.Fragment>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+export default Observability;
@@ -5,6 +5,7 @@ import './App.css';
 function SLA() {
  const [slaData, setSlaData] = useState([]);
  const [days, setDays] = useState(30);
+  const [maxDays, setMaxDays] = useState(30);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [currentPage, setCurrentPage] = useState(1);
@@ -13,6 +14,25 @@ function SLA() {
  const [effectiveDays, setEffectiveDays] = useState(30);
  const [limitedByRetention, setLimitedByRetention] = useState(false);

+  useEffect(() => {
+    // Fetch retention setting from server
+    const fetchRetention = async () => {
+      try {
+        const response = await axios.get('/api/settings');
+        const retentionDays = response.data.retention_days || 30;
+        setMaxDays(parseInt(retentionDays));
+        // Adjust current days if it exceeds retention
+        if (days > retentionDays) {
+          setDays(parseInt(retentionDays));
+        }
+      } catch (error) {
+        // Failed to fetch retention setting, use default
+      }
+    };
+    fetchRetention();
+  }, []);
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
  const loadSLAData = React.useCallback(async () => {
    setLoading(true);
    setError(null);
@@ -25,7 +45,6 @@ function SLA() {
      setLimitedByRetention(Boolean(response.data.limited_by_retention));
      setLoading(false);
    } catch (error) {
-      console.error('Error loading SLA data:', error);
      setError(error.message);
      setLoading(false);
    }
@@ -43,11 +62,23 @@ function SLA() {
    meetingTarget: slaData.filter(s => s.meets_target).length,
    avgUptime: (slaData.reduce((sum, s) => sum + parseFloat(s.actual_uptime), 0) / slaData.length).toFixed(2),
    totalIncidents: slaData.reduce((sum, s) => sum + s.incidents, 0),
-    totalDowntime: slaData.reduce((sum, s) => sum + s.downtime_minutes, 0),
+    totalDowntime: (slaData.reduce((sum, s) => sum + s.downtime_minutes, 0) / 60).toFixed(2), // Convert to hours
  } : null;

  return (
    <div className="container">
+      {limitedByRetention && (
+        <div style={{ 
+          padding: '1rem', 
+          marginBottom: '1rem', 
+          backgroundColor: '#fff3cd', 
+          border: '1px solid #ffc107', 
+          borderRadius: '4px',
+          color: '#856404'
+        }}>
+          ⚠️ SLA data limited to {effectiveDays} days (server retention setting). Requested {days} days.
+        </div>
+      )}
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '2rem', flexWrap: 'wrap', gap: '1rem' }}>
        <h2>SLA Dashboard</h2>
        <div style={{ display: 'flex', gap: '0.5rem' }}>
@@ -56,6 +87,8 @@ function SLA() {
              key={d}
              className={`btn ${days === d ? 'btn-primary' : 'btn-secondary'}`}
              onClick={() => setDays(d)}
+              disabled={d > maxDays}
+              style={{ opacity: d > maxDays ? 0.5 : 1 }}
            >
              {d} Days
            </button>
@@ -30,7 +30,6 @@ function SettingsWizard() {
    default_sort: 'name',
    items_per_page: 20,
    refresh_interval: 5000,
-    theme: 'light',
    incident_failure_threshold: 10,
  });

@@ -48,7 +47,7 @@ function SettingsWizard() {
      const response = await axios.get('/api/settings');
      setSettings(response.data);
    } catch (error) {
-      console.error('Error loading settings:', error);
+      // Settings load error handled
    }
  };

@@ -62,7 +61,6 @@ function SettingsWizard() {
      // Clear message after 3 seconds
      setTimeout(() => setSavedMessage(null), 3000);
    } catch (error) {
-      console.error('Error saving settings:', error);
      setSavedMessage({ section: sectionName, success: false, error: error.response?.data?.error || 'Failed to save' });
      setTimeout(() => setSavedMessage(null), 5000);
    } finally {
@@ -115,6 +113,7 @@ function SettingsWizard() {
    { name: 'Gmail', host: 'smtp.gmail.com', port: 587 },
    { name: 'Outlook', host: 'smtp-mail.outlook.com', port: 587 },
    { name: 'Yahoo', host: 'smtp.mail.yahoo.com', port: 587 },
+    { name: 'iCloud', host: 'smtp.mail.me.com', port: 587 },
    { name: 'Custom', host: '', port: 587 },
  ];

@@ -363,6 +362,20 @@ function SettingsWizard() {
            </div>
          </div>

+          <div className="form-row">
+            <div className="form-group">
+              <label>Global Data Retention (days)</label>
+              <input
+                type="number"
+                value={settings.retention_days}
+                onChange={(e) => setSettings({ ...settings, retention_days: parseInt(e.target.value) })}
+                min="1"
+                max="365"
+              />
+              <small>Default retention period for all monitors (1-365 days). Individual monitors can override this.</small>
+            </div>
+          </div>
+
          <div className="form-row">
            <div className="form-group">
              <label>Timezone</label>
@@ -391,6 +404,18 @@ function SettingsWizard() {
          </div>

          <div className="form-row">
+            <div className="form-group">
+              <label>Consecutive Failures Threshold</label>
+              <input
+                type="number"
+                value={settings.consecutive_failures || 3}
+                onChange={(e) => setSettings({ ...settings, consecutive_failures: parseInt(e.target.value) })}
+                min="1"
+                max="100"
+              />
+              <small>Number of consecutive failures before triggering an alert (default: 3)</small>
+            </div>
+
            <div className="form-group">
              <label>Incident Failure Threshold</label>
              <input
@@ -400,7 +425,33 @@ function SettingsWizard() {
                min="1"
                max="100"
              />
-              <small>Number of consecutive failed checks before automatically creating an incident (default: 10)</small>
+              <small>Number of failures before creating an incident (default: 10)</small>
+            </div>
+          </div>
+
+          <div className="form-row">
+            <div className="form-group">
+              <label>Grace Period (seconds)</label>
+              <input
+                type="number"
+                value={settings.grace_period || 300}
+                onChange={(e) => setSettings({ ...settings, grace_period: parseInt(e.target.value) })}
+                min="0"
+                step="60"
+              />
+              <small>Wait time before alerting after first failure (default: 300s = 5 minutes)</small>
+            </div>
+
+            <div className="form-group">
+              <label>Downtime Threshold (seconds)</label>
+              <input
+                type="number"
+                value={settings.downtime_threshold || 600}
+                onChange={(e) => setSettings({ ...settings, downtime_threshold: parseInt(e.target.value) })}
+                min="0"
+                step="60"
+              />
+              <small>Minimum downtime before creating incident (default: 600s = 10 minutes)</small>
            </div>
          </div>

@@ -411,25 +462,183 @@ function SettingsWizard() {
              timeout: settings.timeout,
              timezone: settings.timezone,
              retention_days: settings.retention_days,
-              auto_cleanup_enabled: settings.auto_cleanup_enabled,
              consecutive_failures: settings.consecutive_failures,
              grace_period: settings.grace_period,
              downtime_threshold: settings.downtime_threshold,
+              incident_failure_threshold: settings.incident_failure_threshold,
+            })}
+            disabled={savingSection === 'Monitoring'}
+          >
+            {savingSection === 'Monitoring' ? 'Saving...' : '💾 Save Monitoring Settings'}
+          </button>
+        </div>
+      </div>
+
+      {/* Alert Settings */}
+      <div className="settings-section">
+        <h3>🔔 Alert Settings</h3>
+        <div className="settings-form">
+          <div className="form-row">
+            <div className="form-group">
+              <label>Alert Retry Count</label>
+              <input
+                type="number"
+                value={settings.alert_retry_count || 3}
+                onChange={(e) => setSettings({ ...settings, alert_retry_count: parseInt(e.target.value) })}
+                min="0"
+                max="10"
+              />
+              <small>Number of times to retry sending alert if it fails (default: 3)</small>
+            </div>
+
+            <div className="form-group">
+              <label>Alert Retry Delay (seconds)</label>
+              <input
+                type="number"
+                value={settings.alert_retry_delay || 60}
+                onChange={(e) => setSettings({ ...settings, alert_retry_delay: parseInt(e.target.value) })}
+                min="0"
+                step="30"
+              />
+              <small>Wait time between alert retries (default: 60s)</small>
+            </div>
+          </div>
+
+          <div className="form-group">
+            <label>Fallback Webhook URL (optional)</label>
+            <input
+              type="url"
+              value={settings.fallback_webhook || ''}
+              onChange={(e) => setSettings({ ...settings, fallback_webhook: e.target.value })}
+              placeholder="https://backup-webhook.example.com"
+            />
+            <small>Backup webhook to use if primary alert methods fail</small>
+          </div>
+
+          <div className="form-row">
+            <div className="form-group">
+              <label>Global Quiet Hours Start</label>
+              <input
+                type="time"
+                value={settings.global_quiet_hours_start || ''}
+                onChange={(e) => setSettings({ ...settings, global_quiet_hours_start: e.target.value })}
+              />
+              <small>Suppress non-critical alerts starting at this time</small>
+            </div>
+
+            <div className="form-group">
+              <label>Global Quiet Hours End</label>
+              <input
+                type="time"
+                value={settings.global_quiet_hours_end || ''}
+                onChange={(e) => setSettings({ ...settings, global_quiet_hours_end: e.target.value })}
+              />
+              <small>Resume normal alerting at this time</small>
+            </div>
+          </div>
+
+          <div className="form-group">
+            <label>Escalation Hours</label>
+            <input
+              type="number"
+              value={settings.escalation_hours || 4}
+              onChange={(e) => setSettings({ ...settings, escalation_hours: parseInt(e.target.value) })}
+              min="1"
+              max="48"
+            />
+            <small>Hours after which unresolved incidents are escalated (default: 4)</small>
+          </div>
+
+          <button
+            className="btn btn-primary"
+            onClick={() => handleSaveSection('Alerts', {
              alert_retry_count: settings.alert_retry_count,
              alert_retry_delay: settings.alert_retry_delay,
              fallback_webhook: settings.fallback_webhook,
              global_quiet_hours_start: settings.global_quiet_hours_start,
              global_quiet_hours_end: settings.global_quiet_hours_end,
              escalation_hours: settings.escalation_hours,
+            })}
+            disabled={savingSection === 'Alerts'}
+          >
+            {savingSection === 'Alerts' ? 'Saving...' : '💾 Save Alert Settings'}
+          </button>
+        </div>
+      </div>
+
+      {/* Dashboard Settings */}
+      <div className="settings-section">
+        <h3>📊 Dashboard Settings</h3>
+        <div className="settings-form">
+          <div className="form-row">
+            <div className="form-group">
+              <label>Default Sort Order</label>
+              <select
+                value={settings.default_sort || 'name'}
+                onChange={(e) => setSettings({ ...settings, default_sort: e.target.value })}
+              >
+                <option value="name">Name</option>
+                <option value="status">Status</option>
+                <option value="created_at">Created Date</option>
+                <option value="group">Group</option>
+              </select>
+              <small>Default sorting for resources list</small>
+            </div>
+
+            <div className="form-group">
+              <label>Items Per Page</label>
+              <input
+                type="number"
+                value={settings.items_per_page || 20}
+                onChange={(e) => setSettings({ ...settings, items_per_page: parseInt(e.target.value) })}
+                min="10"
+                max="100"
+                step="10"
+              />
+              <small>Number of resources to display per page</small>
+            </div>
+          </div>
+
+          <div className="form-row">
+            <div className="form-group">
+              <label>Dashboard Refresh Interval (ms)</label>
+              <input
+                type="number"
+                value={settings.refresh_interval || 5000}
+                onChange={(e) => setSettings({ ...settings, refresh_interval: parseInt(e.target.value) })}
+                min="1000"
+                step="1000"
+              />
+              <small>How often to refresh dashboard data (default: 5000ms = 5 seconds)</small>
+            </div>
+          </div>
+
+          <div className="form-group">
+            <label className="toggle-switch-row">
+              <span>Auto Cleanup Enabled</span>
+              <label className="toggle-switch">
+                <input
+                  type="checkbox"
+                  checked={settings.auto_cleanup_enabled || false}
+                  onChange={(e) => setSettings({ ...settings, auto_cleanup_enabled: e.target.checked })}
+                />
+                <span className="toggle-slider"></span>
+              </label>
+            </label>
+            <small>Automatically archive old check data based on retention period</small>
+          </div>
+
+          <button
+            className="btn btn-primary"
+            onClick={() => handleSaveSection('Dashboard', {
              default_sort: settings.default_sort,
              items_per_page: settings.items_per_page,
              refresh_interval: settings.refresh_interval,
-              theme: settings.theme,
-              incident_failure_threshold: settings.incident_failure_threshold,
+              auto_cleanup_enabled: settings.auto_cleanup_enabled,
            })}
-            disabled={savingSection === 'Monitoring'}
+            disabled={savingSection === 'Dashboard'}
          >
-            {savingSection === 'Monitoring' ? 'Saving...' : '💾 Save Monitoring Settings'}
+            {savingSection === 'Dashboard' ? 'Saving...' : '💾 Save Dashboard Settings'}
          </button>
        </div>
      </div>
@@ -12,7 +12,7 @@ function Status() {

  useEffect(() => {
    loadStatusData();
-    const interval = setInterval(loadStatusData, 30000); // Refresh every 30 seconds
+    const interval = setInterval(loadStatusData, 15000); // Refresh every 15 seconds for critical status
    return () => clearInterval(interval);
  }, []);

@@ -28,7 +28,7 @@ function Status() {
      setMaintenanceWindows(maintenanceRes.data.maintenanceWindows || []);
      setLastUpdated(new Date());
    } catch (error) {
-      console.error('Error loading status data:', error);
+      // Status load error handled
    } finally {
      setLoading(false);
    }
@@ -28,12 +28,19 @@ export const formatLocalTime = (timestamp, options = {}) => {
  let timeZone;
  try {
    const cachedSettings = localStorage.getItem('serverTimezone');
-    if (cachedSettings && cachedSettings !== 'null' && cachedSettings !== 'undefined' && cachedSettings.trim() !== '') {
+    const cacheTime = localStorage.getItem('serverTimezoneTime');
+    const now = Date.now();
+    // Invalidate cache every 1 hour
+    if (cachedSettings && cacheTime && (now - parseInt(cacheTime)) < 3600000 && cachedSettings !== 'null' && cachedSettings !== 'undefined' && cachedSettings.trim() !== '') {
      // Remove any quotes that might be in the string
      timeZone = cachedSettings.replace(/^["']|["']$/g, '').trim();
+    } else if (cachedSettings) {
+      // Clear stale cache
+      localStorage.removeItem('serverTimezone');
+      localStorage.removeItem('serverTimezoneTime');
    }
  } catch (e) {
-    console.error('Error reading serverTimezone from localStorage:', e);
+    // Timezone load error handled silently
  }
  
  const defaultOptions = {
@@ -72,12 +79,27 @@ export const formatLocalTimeOnly = (timestamp, options = {}) => {

 /**
 * Format timestamp for chart display (shorter format)
+ * Shows date and time for better context
 */
 export const formatChartTime = (timestamp) => {
  if (!timestamp) return '';
  
  const date = new Date(timestamp);
-  return date.toLocaleTimeString('en-US', {
+  const now = new Date();
+  const diffDays = Math.floor((now - date) / (1000 * 60 * 60 * 24));
+  
+  // If within last 24 hours, show time only
+  if (diffDays === 0) {
+    return date.toLocaleTimeString('en-US', {
+      hour: '2-digit',
+      minute: '2-digit'
+    });
+  }
+  
+  // Otherwise show date and time
+  return date.toLocaleString('en-US', {
+    month: 'short',
+    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit'
  });
@@ -14,6 +14,7 @@
        "cors": "^2.8.5",
        "dotenv": "^16.3.1",
        "express": "^4.18.2",
+        "jsonwebtoken": "^9.0.3",
        "node-cron": "^3.0.3",
        "nodemailer": "^6.9.7",
        "ping": "^0.4.4",
@@ -253,6 +254,12 @@
        "ieee754": "^1.1.13"
      }
    },
+    "node_modules/buffer-equal-constant-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
+      "integrity": "sha512-zRpUiDwd/xk6ADqPMATG8vc9VPrkck7T07OIx0gnjmJAnHnTVXNQG3vfvWNuiZIkwu9KrKdA1iJKfsfTVxE6NA==",
+      "license": "BSD-3-Clause"
+    },
    "node_modules/bytes": {
      "version": "3.1.2",
      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
@@ -596,6 +603,15 @@
        "node": ">= 0.4"
      }
    },
+    "node_modules/ecdsa-sig-formatter": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz",
+      "integrity": "sha512-nagl3RYrbNv6kQkeJIpt6NJZy8twLB/2vtz6yN9Z4vRKHN4/QZJIEbqohALSgwKdnksuY3k5Addp5lg8sVoVcQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
    "node_modules/ee-first": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
@@ -1136,6 +1152,55 @@
        "node": ">=0.12.0"
      }
    },
+    "node_modules/jsonwebtoken": {
+      "version": "9.0.3",
+      "resolved": "https://registry.npmjs.org/jsonwebtoken/-/jsonwebtoken-9.0.3.tgz",
+      "integrity": "sha512-MT/xP0CrubFRNLNKvxJ2BYfy53Zkm++5bX9dtuPbqAeQpTVe0MQTFhao8+Cp//EmJp244xt6Drw/GVEGCUj40g==",
+      "license": "MIT",
+      "dependencies": {
+        "jws": "^4.0.1",
+        "lodash.includes": "^4.3.0",
+        "lodash.isboolean": "^3.0.3",
+        "lodash.isinteger": "^4.0.4",
+        "lodash.isnumber": "^3.0.3",
+        "lodash.isplainobject": "^4.0.6",
+        "lodash.isstring": "^4.0.1",
+        "lodash.once": "^4.0.0",
+        "ms": "^2.1.1",
+        "semver": "^7.5.4"
+      },
+      "engines": {
+        "node": ">=12",
+        "npm": ">=6"
+      }
+    },
+    "node_modules/jsonwebtoken/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "license": "MIT"
+    },
+    "node_modules/jwa": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/jwa/-/jwa-2.0.1.tgz",
+      "integrity": "sha512-hRF04fqJIP8Abbkq5NKGN0Bbr3JxlQ+qhZufXVr0DvujKy93ZCbXZMHDL4EOtodSbCWxOqR8MS1tXA5hwqCXDg==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer-equal-constant-time": "^1.0.1",
+        "ecdsa-sig-formatter": "1.0.11",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "node_modules/jws": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/jws/-/jws-4.0.1.tgz",
+      "integrity": "sha512-EKI/M/yqPncGUUh44xz0PxSidXFr/+r0pA70+gIYhjv+et7yxM+s29Y+VGDkovRofQem0fs7Uvf4+YmAdyRduA==",
+      "license": "MIT",
+      "dependencies": {
+        "jwa": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
    "node_modules/lodash": {
      "version": "4.17.21",
      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
@@ -1143,6 +1208,48 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/lodash.includes": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/lodash.includes/-/lodash.includes-4.3.0.tgz",
+      "integrity": "sha512-W3Bx6mdkRTGtlJISOvVD/lbqjTlPPUDTMnlXZFnVwi9NKJ6tiAk6LVdlhZMm17VZisqhKcgzpO5Wz91PCt5b0w==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isboolean": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/lodash.isboolean/-/lodash.isboolean-3.0.3.tgz",
+      "integrity": "sha512-Bz5mupy2SVbPHURB98VAcw+aHh4vRV5IPNhILUCsOzRmsTmSQ17jIuqopAentWoehktxGd9e/hbIXq980/1QJg==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isinteger": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/lodash.isinteger/-/lodash.isinteger-4.0.4.tgz",
+      "integrity": "sha512-DBwtEWN2caHQ9/imiNeEA5ys1JoRtRfY3d7V9wkqtbycnAmTvRRmbHKDV4a0EYc678/dia0jrte4tjYwVBaZUA==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isnumber": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/lodash.isnumber/-/lodash.isnumber-3.0.3.tgz",
+      "integrity": "sha512-QYqzpfwO3/CWf3XP+Z+tkQsfaLL/EnUlXWVkIk5FUPc4sBdTehEqZONuyRt2P67PXAk+NXmTBcc97zw9t1FQrw==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isplainobject": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz",
+      "integrity": "sha512-oSXzaWypCMHkPC3NvBEaPHf0KsA5mvPrOPgQWDsbg8n7orZ290M0BmC/jgRZ4vcJ6DTAhjrsSYgdsW/F+MFOBA==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isstring": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
+      "integrity": "sha512-0wJxfxH1wgO3GrbuP+dTTk7op+6L41QCXbGINEmD+ny/G/eCqGzxyCsh7159S+mgDDcoarnBw6PC1PS5+wUGgw==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.once": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
+      "integrity": "sha512-Sb487aTOCr9drQVL8pIxOzVhafOjZN9UU54hiN8PU3uAiSV7lx1yYNpbNmex2PK6dSJoNTSJUUswT651yww3Mg==",
+      "license": "MIT"
+    },
    "node_modules/math-intrinsics": {
      "version": "1.1.0",
      "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
@@ -12,22 +12,28 @@
    "build:commit": "npm run build && git add -f client/build/ && git commit -m \"Auto-commit built React app\" && git push",
    "install-all": "npm install && cd client && npm install"
  },
-  "keywords": ["monitoring", "uptime", "alerts", "dashboard"],
+  "keywords": [
+    "monitoring",
+    "uptime",
+    "alerts",
+    "dashboard"
+  ],
  "author": "",
  "license": "MIT",
  "dependencies": {
-    "express": "^4.18.2",
-    "cors": "^2.8.5",
-    "better-sqlite3": "^9.2.2",
-    "node-cron": "^3.0.3",
    "axios": "^1.6.2",
-    "nodemailer": "^6.9.7",
+    "better-sqlite3": "^9.2.2",
+    "cors": "^2.8.5",
    "dotenv": "^16.3.1",
+    "express": "^4.18.2",
+    "jsonwebtoken": "^9.0.3",
+    "node-cron": "^3.0.3",
+    "nodemailer": "^6.9.7",
    "ping": "^0.4.4",
    "ws": "^8.17.1"
  },
  "devDependencies": {
-    "nodemon": "^3.0.2",
-    "concurrently": "^8.2.2"
+    "concurrently": "^8.2.2",
+    "nodemon": "^3.0.2"
  }
 }
@@ -0,0 +1,152 @@
+const db = require('./database');
+
+class AuditLogger {
+  // Log an audit event
+  log(action, entityType, entityId, changes = {}, userId = 'system', ipAddress = null) {
+    try {
+      db.prepare(`
+        INSERT INTO audit_logs 
+        (action, entity_type, entity_id, user_id, changes, ip_address, created_at)
+        VALUES (?, ?, ?, ?, ?, ?, datetime('now'))
+      `).run(
+        action,
+        entityType,
+        entityId,
+        userId,
+        JSON.stringify(changes),
+        ipAddress
+      );
+    } catch (error) {
+      // Silent failure - don't crash on audit logging errors
+    }
+  }
+
+  // Log resource changes
+  logResourceChange(action, resourceId, changes, userId = 'system', ipAddress = null) {
+    this.log(action, 'resource', resourceId, changes, userId, ipAddress);
+  }
+
+  // Log settings changes
+  logSettingsChange(settingKey, oldValue, newValue, userId = 'system', ipAddress = null) {
+    this.log('update', 'settings', settingKey, { old: oldValue, new: newValue }, userId, ipAddress);
+  }
+
+  // Log group changes
+  logGroupChange(action, groupId, changes, userId = 'system', ipAddress = null) {
+    this.log(action, 'group', groupId, changes, userId, ipAddress);
+  }
+
+  // Log maintenance window changes
+  logMaintenanceChange(action, windowId, changes, userId = 'system', ipAddress = null) {
+    this.log(action, 'maintenance_window', windowId, changes, userId, ipAddress);
+  }
+
+  // Get audit logs with filters
+  getAuditLogs(filters = {}) {
+    const {
+      entityType = null,
+      entityId = null,
+      userId = null,
+      action = null,
+      startDate = null,
+      endDate = null,
+      limit = 100,
+      offset = 0
+    } = filters;
+
+    let query = `
+      SELECT 
+        id,
+        action,
+        entity_type,
+        entity_id,
+        user_id,
+        changes,
+        ip_address,
+        REPLACE(created_at, ' ', 'T') || 'Z' as created_at
+      FROM audit_logs
+      WHERE 1=1
+    `;
+    const params = [];
+
+    if (entityType) {
+      query += ' AND entity_type = ?';
+      params.push(entityType);
+    }
+
+    if (entityId) {
+      query += ' AND entity_id = ?';
+      params.push(entityId);
+    }
+
+    if (userId) {
+      query += ' AND user_id = ?';
+      params.push(userId);
+    }
+
+    if (action) {
+      query += ' AND action = ?';
+      params.push(action);
+    }
+
+    if (startDate) {
+      query += ' AND created_at >= ?';
+      params.push(startDate);
+    }
+
+    if (endDate) {
+      query += ' AND created_at <= ?';
+      params.push(endDate);
+    }
+
+    query += ' ORDER BY created_at DESC LIMIT ? OFFSET ?';
+    params.push(limit, offset);
+
+    try {
+      const logs = db.prepare(query).all(...params);
+      
+      // Parse JSON changes
+      return logs.map(log => ({
+        ...log,
+        changes: log.changes ? JSON.parse(log.changes) : {}
+      }));
+    } catch (error) {
+      return [];
+    }
+  }
+
+  // Get audit summary stats
+  getSummary(days = 7) {
+    try {
+      const stats = db.prepare(`
+        SELECT 
+          COUNT(*) as total_events,
+          COUNT(DISTINCT user_id) as unique_users,
+          COUNT(DISTINCT entity_type) as entity_types,
+          action,
+          COUNT(*) as action_count
+        FROM audit_logs
+        WHERE created_at > datetime('now', '-' || ? || ' days')
+        GROUP BY action
+      `).all(days);
+
+      const totalEvents = db.prepare(`
+        SELECT COUNT(*) as count
+        FROM audit_logs
+        WHERE created_at > datetime('now', '-' || ? || ' days')
+      `).get(days);
+
+      return {
+        totalEvents: totalEvents?.count || 0,
+        actionBreakdown: stats.map(s => ({
+          action: s.action,
+          count: s.action_count
+        }))
+      };
+    } catch (error) {
+      return { totalEvents: 0, actionBreakdown: [] };
+    }
+  }
+}
+
+module.exports = new AuditLogger();
@@ -0,0 +1,62 @@
+// Circuit breaker implementation for API resilience
+class CircuitBreaker {
+  constructor(failureThreshold = 5, resetTimeout = 60000, errorFilter = null) {
+    this.failureThreshold = failureThreshold;
+    this.resetTimeout = resetTimeout;
+    this.errorFilter = errorFilter;
+    this.failureCount = 0;
+    this.lastFailureTime = null;
+    this.state = 'closed'; // closed, open, half-open
+  }
+
+  async execute(fn, fallback = null) {
+    if (this.state === 'open') {
+      if (Date.now() - this.lastFailureTime > this.resetTimeout) {
+        this.state = 'half-open';
+      } else {
+        if (fallback) return fallback();
+        throw new Error('Circuit breaker is open');
+      }
+    }
+
+    try {
+      const result = await fn();
+      if (this.state === 'half-open') {
+        this.close();
+      }
+      return result;
+    } catch (error) {
+      if (this.errorFilter && !this.errorFilter(error)) {
+        throw error;
+      }
+
+      this.failureCount++;
+      this.lastFailureTime = Date.now();
+
+      if (this.failureCount >= this.failureThreshold) {
+        this.open();
+      }
+
+      throw error;
+    }
+  }
+
+  close() {
+    this.failureCount = 0;
+    this.state = 'closed';
+  }
+
+  open() {
+    this.state = 'open';
+  }
+
+  getState() {
+    return {
+      state: this.state,
+      failureCount: this.failureCount,
+      lastFailureTime: this.lastFailureTime
+    };
+  }
+}
+
+module.exports = CircuitBreaker;
@@ -22,6 +22,7 @@ db.exec(`
    enabled INTEGER DEFAULT 1,
    maintenance_mode INTEGER DEFAULT 0,
    group_id INTEGER REFERENCES groups(id) ON DELETE SET NULL,
+    retention_days INTEGER DEFAULT NULL,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
  );

@@ -111,6 +112,20 @@ db.exec(`
    UNIQUE(resource_id, tag)
  );

+  CREATE TABLE IF NOT EXISTS notifications (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    resource_id INTEGER,
+    incident_id INTEGER,
+    type TEXT NOT NULL,
+    title TEXT NOT NULL,
+    message TEXT NOT NULL,
+    status TEXT DEFAULT 'unread',
+    read INTEGER DEFAULT 0,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (resource_id) REFERENCES resources(id) ON DELETE CASCADE,
+    FOREIGN KEY (incident_id) REFERENCES incidents(id) ON DELETE CASCADE
+  );
+
  CREATE INDEX IF NOT EXISTS idx_checks_resource_id ON checks(resource_id);
  CREATE INDEX IF NOT EXISTS idx_checks_checked_at ON checks(checked_at);
  CREATE INDEX IF NOT EXISTS idx_checks_resource_checked ON checks(resource_id, checked_at);
@@ -122,8 +137,34 @@ db.exec(`
  CREATE INDEX IF NOT EXISTS idx_alert_rules_resource ON alert_rules(resource_id);
  CREATE INDEX IF NOT EXISTS idx_transaction_checks_resource ON transaction_checks(resource_id);
  CREATE INDEX IF NOT EXISTS idx_archived_checks_resource_time ON archived_checks(resource_id, checked_at DESC);
+  CREATE INDEX IF NOT EXISTS idx_notifications_created ON notifications(created_at DESC);
+  CREATE INDEX IF NOT EXISTS idx_notifications_read_status ON notifications(read, created_at DESC);
  CREATE INDEX IF NOT EXISTS idx_resource_tags_resource ON resource_tags(resource_id);
  CREATE INDEX IF NOT EXISTS idx_resource_tags_tag ON resource_tags(tag);
+
+  CREATE TABLE IF NOT EXISTS audit_logs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    action TEXT NOT NULL,
+    entity_type TEXT NOT NULL,
+    entity_id TEXT,
+    user_id TEXT DEFAULT 'system',
+    changes TEXT,
+    ip_address TEXT,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+  );
+
+  CREATE TABLE IF NOT EXISTS error_logs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    error_message TEXT NOT NULL,
+    stack_trace TEXT,
+    context TEXT,
+    occurred_at DATETIME DEFAULT CURRENT_TIMESTAMP
+  );
+
+  CREATE INDEX IF NOT EXISTS idx_audit_logs_entity ON audit_logs(entity_type, entity_id);
+  CREATE INDEX IF NOT EXISTS idx_audit_logs_user ON audit_logs(user_id);
+  CREATE INDEX IF NOT EXISTS idx_audit_logs_created ON audit_logs(created_at DESC);
+  CREATE INDEX IF NOT EXISTS idx_error_logs_occurred ON error_logs(occurred_at DESC);
 `);

 // Lightweight migrations - for existing databases
@@ -141,10 +182,9 @@ try {

 try {
  db.prepare("ALTER TABLE resources ADD COLUMN maintenance_mode INTEGER DEFAULT 0").run();
-  console.log('[DB] Added maintenance_mode column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] maintenance_mode column already exists');
+    // Column already exists
  }
 }

@@ -174,12 +214,11 @@ try {

 try {
  db.prepare("ALTER TABLE resources ADD COLUMN email_to TEXT").run();
-  console.log('[DB] Added email_to column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] email_to column already exists');
+    // email_to column already exists
  } else {
-    console.error('[DB] Error adding email_to column:', err.message);
+    // Error adding email_to column
  }
 }

@@ -202,66 +241,67 @@ try {
 // New columns for features
 try {
  db.prepare("ALTER TABLE resources ADD COLUMN tags TEXT").run();
-  console.log('[DB] Added tags column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] tags column already exists');
+    // tags column already exists
  }
 }

 try {
  db.prepare("ALTER TABLE resources ADD COLUMN consecutive_failures_threshold INTEGER DEFAULT 1").run();
-  console.log('[DB] Added consecutive_failures_threshold column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] consecutive_failures_threshold column already exists');
+    // consecutive_failures_threshold column already exists
  }
 }

 try {
  db.prepare("ALTER TABLE resources ADD COLUMN response_time_threshold INTEGER").run();
-  console.log('[DB] Added response_time_threshold column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] response_time_threshold column already exists');
+    // response_time_threshold column already exists
  }
 }

 try {
  db.prepare("ALTER TABLE resources ADD COLUMN response_time_baseline INTEGER").run();
-  console.log('[DB] Added response_time_baseline column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] response_time_baseline column already exists');
+    // response_time_baseline column already exists
  }
 }

 try {
  db.prepare("ALTER TABLE resources ADD COLUMN is_transaction INTEGER DEFAULT 0").run();
-  console.log('[DB] Added is_transaction column to resources');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] is_transaction column already exists');
+    // is_transaction column already exists
+  }
+}
+
+try {
+  db.prepare("ALTER TABLE resources ADD COLUMN retention_days INTEGER DEFAULT NULL").run();
+} catch (err) {
+  if (err.message.includes('duplicate')) {
+    // retention_days column already exists
  }
 }

 // Add description column to incidents for incident summaries
 try {
  db.prepare("ALTER TABLE incidents ADD COLUMN description TEXT").run();
-  console.log('[DB] Added description column to incidents');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] description column already exists');
+    // description column already exists
  }
 }

 // Add failed_check_count to incidents to track consecutive failures at creation time
 try {
  db.prepare("ALTER TABLE incidents ADD COLUMN failed_check_count INTEGER DEFAULT 0").run();
-  console.log('[DB] Added failed_check_count column to incidents');
 } catch (err) {
  if (err.message.includes('duplicate')) {
-    console.log('[DB] failed_check_count column already exists');
+    // failed_check_count column already exists
  }
 }

@@ -10,6 +10,33 @@ const scheduler = require('./scheduler');
 const monitorService = require('./monitorService');
 const notificationService = require('./notificationService');
 const cache = require('./cache');
+const security = require('./securityMiddleware');
+const metrics = require('./metrics');
+const auditLog = require('./auditLog');
+
+// Initialize notifications table if it doesn't exist
+try {
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS notifications (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      resource_id INTEGER,
+      incident_id INTEGER,
+      type TEXT NOT NULL,
+      title TEXT NOT NULL,
+      message TEXT NOT NULL,
+      status TEXT DEFAULT 'unread',
+      read INTEGER DEFAULT 0,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (resource_id) REFERENCES resources(id) ON DELETE CASCADE,
+      FOREIGN KEY (incident_id) REFERENCES incidents(id) ON DELETE CASCADE
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_notifications_created ON notifications(created_at DESC);
+    CREATE INDEX IF NOT EXISTS idx_notifications_read_status ON notifications(read, created_at DESC);
+  `);
+} catch (error) {
+  console.error('Error initializing notifications table:', error);
+}

 const app = express();
 const PORT = process.env.PORT || 3001;
@@ -81,6 +108,44 @@ function getTimezoneOffset() {
 app.use(cors());
 app.use(express.json());

+// Metrics tracking middleware
+app.use((req, res, next) => {
+  const startTime = Date.now();
+  
+  // Capture original res.json and res.send
+  const originalJson = res.json.bind(res);
+  const originalSend = res.send.bind(res);
+  
+  const trackRequest = () => {
+    const duration = Date.now() - startTime;
+    const endpoint = req.route?.path || req.path;
+    metrics.trackApiRequest(endpoint, req.method, res.statusCode, duration);
+  };
+  
+  res.json = function(data) {
+    trackRequest();
+    return originalJson(data);
+  };
+  
+  res.send = function(data) {
+    trackRequest();
+    return originalSend(data);
+  };
+  
+  next();
+});
+
+// Error tracking middleware
+app.use((err, req, res, next) => {
+  metrics.trackError(err, {
+    method: req.method,
+    url: req.url,
+    ip: req.ip
+  });
+  
+  res.status(500).json({ error: 'Internal server error' });
+});
+
 // API Routes

 // Get all groups
@@ -139,16 +204,37 @@ app.get('/api/resources/:id', (req, res) => {

 // Create resource
 app.post('/api/resources', (req, res) => {
-  const { name, url, type, check_interval, timeout, group_id, http_keyword, http_headers, quiet_hours_start, quiet_hours_end, cert_expiry_days, sla_target, email_to, maintenance_mode } = req.body;
+  const { name, url, type, check_interval, timeout, group_id, http_keyword, http_headers, quiet_hours_start, quiet_hours_end, cert_expiry_days, sla_target, email_to, maintenance_mode, retention_days } = req.body;

  if (!name || !url) {
    return res.status(400).json({ error: 'Name and URL are required' });
  }

+  // Validate URL format
+  try {
+    new URL(url);
+  } catch (e) {
+    return res.status(400).json({ error: 'Invalid URL format' });
+  }
+
+  // Validate numeric fields
+  if (check_interval && (isNaN(check_interval) || check_interval < 10000)) {
+    return res.status(400).json({ error: 'Check interval must be at least 10000ms' });
+  }
+  if (timeout && (isNaN(timeout) || timeout < 1000)) {
+    return res.status(400).json({ error: 'Timeout must be at least 1000ms' });
+  }
+  if (sla_target && (isNaN(sla_target) || sla_target < 0 || sla_target > 100)) {
+    return res.status(400).json({ error: 'SLA target must be between 0 and 100' });
+  }
+  if (retention_days && (isNaN(retention_days) || retention_days < 1 || retention_days > 365)) {
+    return res.status(400).json({ error: 'Retention days must be between 1 and 365' });
+  }
+
  try {
    const stmt = db.prepare(`
-      INSERT INTO resources (name, url, type, check_interval, timeout, group_id, http_keyword, http_headers, quiet_hours_start, quiet_hours_end, cert_expiry_days, sla_target, email_to, maintenance_mode)
-      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+      INSERT INTO resources (name, url, type, check_interval, timeout, group_id, http_keyword, http_headers, quiet_hours_start, quiet_hours_end, cert_expiry_days, sla_target, email_to, maintenance_mode, retention_days)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `);

    const result = stmt.run(
@@ -165,16 +251,19 @@ app.post('/api/resources', (req, res) => {
      cert_expiry_days || 30,
      sla_target || 99.9,
      email_to || null,
-      maintenance_mode ? 1 : 0
+      maintenance_mode ? 1 : 0,
+      retention_days || null
    );

    // Invalidate related cache entries
    cache.invalidatePattern('history:');
    cache.invalidatePattern('sla:');

+    // Audit log
+    auditLog.logResourceChange('create', result.lastInsertRowid, { name, url, type, enabled: true }, 'system', req.ip);
+
    res.json({ id: result.lastInsertRowid, message: 'Resource created' });
  } catch (err) {
-    console.error('[API] Error creating resource:', err.message);
    // Helpful hint if migration missing
    const hint = err.message.includes('no column named maintenance_mode')
      ? 'Database schema missing maintenance_mode. Restart server to run migrations.'
@@ -185,11 +274,11 @@ app.post('/api/resources', (req, res) => {

 // Update resource
 app.put('/api/resources/:id', (req, res) => {
-  const { name, url, type, check_interval, timeout, enabled, group_id, http_keyword, http_headers, quiet_hours_start, quiet_hours_end, cert_expiry_days, sla_target, email_to, maintenance_mode } = req.body;
+  const { name, url, type, check_interval, timeout, enabled, group_id, http_keyword, http_headers, quiet_hours_start, quiet_hours_end, cert_expiry_days, sla_target, email_to, maintenance_mode, retention_days } = req.body;

  const stmt = db.prepare(`
    UPDATE resources 
-    SET name = ?, url = ?, type = ?, check_interval = ?, timeout = ?, enabled = ?, group_id = ?, http_keyword = ?, http_headers = ?, quiet_hours_start = ?, quiet_hours_end = ?, cert_expiry_days = ?, sla_target = ?, email_to = ?, maintenance_mode = ?
+    SET name = ?, url = ?, type = ?, check_interval = ?, timeout = ?, enabled = ?, group_id = ?, http_keyword = ?, http_headers = ?, quiet_hours_start = ?, quiet_hours_end = ?, cert_expiry_days = ?, sla_target = ?, email_to = ?, maintenance_mode = ?, retention_days = ?
    WHERE id = ?
  `);

@@ -209,6 +298,7 @@ app.put('/api/resources/:id', (req, res) => {
    sla_target || 99.9,
    email_to || null,
    maintenance_mode ? 1 : 0,
+    retention_days || null,
    req.params.id
  );

@@ -257,12 +347,19 @@ app.patch('/api/resources/:id/group', (req, res) => {

 // Delete resource
 app.delete('/api/resources/:id', (req, res) => {
+  const resource = db.prepare('SELECT name, url FROM resources WHERE id = ?').get(req.params.id);
+  
  db.prepare('DELETE FROM resources WHERE id = ?').run(req.params.id);
  
  // Invalidate related cache entries
  cache.invalidatePattern('history:');
  cache.invalidatePattern('sla:');
  
+  // Audit log
+  if (resource) {
+    auditLog.logResourceChange('delete', req.params.id, { name: resource.name, url: resource.url }, 'system', req.ip);
+  }
+  
  res.json({ message: 'Resource deleted' });
 });

@@ -339,6 +436,84 @@ app.get('/api/incidents', (req, res) => {
  res.json({ incidents });
 });

+// Get notifications (in-app notification center)
+app.get('/api/notifications', (req, res) => {
+  const limit = parseInt(req.query.limit) || 50;
+  const offset = parseInt(req.query.offset) || 0;
+  const read = req.query.read; // undefined = all, 'unread' = only unread, 'read' = only read
+
+  let whereClause = '';
+  let whereClauseCount = '';
+  if (read === 'unread') {
+    whereClause = 'WHERE n.read = 0';
+    whereClauseCount = 'WHERE read = 0';
+  } else if (read === 'read') {
+    whereClause = 'WHERE n.read = 1';
+    whereClauseCount = 'WHERE read = 1';
+  }
+
+  const notifications = db.prepare(`
+    SELECT 
+      n.id,
+      n.resource_id,
+      n.incident_id,
+      n.type,
+      n.title,
+      n.message,
+      n.read,
+      n.created_at,
+      r.name as resource_name,
+      i.started_at as incident_started_at
+    FROM notifications n
+    LEFT JOIN resources r ON n.resource_id = r.id
+    LEFT JOIN incidents i ON n.incident_id = i.id
+    ${whereClause}
+    ORDER BY n.created_at DESC
+    LIMIT ? OFFSET ?
+  `).all(limit, offset);
+
+  const total = db.prepare(`
+    SELECT COUNT(*) as count FROM notifications ${whereClauseCount}
+  `).get().count;
+
+  const unreadCount = db.prepare('SELECT COUNT(*) as count FROM notifications WHERE read = 0').get().count;
+
+  res.json({ notifications, total, unreadCount });
+});
+
+// Get unread notification count
+app.get('/api/notifications/unread/count', (req, res) => {
+  const count = db.prepare('SELECT COUNT(*) as count FROM notifications WHERE read = 0').get().count;
+  res.json({ unreadCount: count });
+});
+
+// Mark notification as read
+app.put('/api/notifications/:id/read', (req, res) => {
+  db.prepare('UPDATE notifications SET read = 1 WHERE id = ?').run(req.params.id);
+  res.json({ success: true });
+});
+
+// Delete notification
+app.delete('/api/notifications/:id', (req, res) => {
+  db.prepare('DELETE FROM notifications WHERE id = ?').run(req.params.id);
+  res.json({ success: true });
+});
+
+// Clear all notifications
+app.post('/api/notifications/clear', (req, res) => {
+  const type = req.body.type; // 'all', 'read', 'unread'
+  
+  if (type === 'all') {
+    db.prepare('DELETE FROM notifications').run();
+  } else if (type === 'read') {
+    db.prepare('DELETE FROM notifications WHERE read = 1').run();
+  } else if (type === 'unread') {
+    db.prepare('DELETE FROM notifications WHERE read = 0').run();
+  }
+  
+  res.json({ success: true });
+});
+
 // Get settings
 app.get('/api/settings', (req, res) => {
  const settings = {
@@ -414,8 +589,43 @@ app.post('/api/settings', (req, res) => {
    theme,
  } = req.body;

-  const envContent = `PORT=${process.env.PORT || 3001}
-EMAIL_ENABLED=${email_enabled}
+  // Validate email configuration if enabled
+  if (email_enabled) {
+    if (!email_host || !email_port || !email_user || !email_pass) {
+      return res.status(400).json({ error: 'Email configuration incomplete. All fields required when enabled.' });
+    }
+    if (isNaN(email_port) || email_port < 1 || email_port > 65535) {
+      return res.status(400).json({ error: 'Invalid email port number' });
+    }
+    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email_from)) {
+      return res.status(400).json({ error: 'Invalid email_from address' });
+    }
+  }
+
+  // Validate webhook configuration if enabled
+  if (webhook_enabled) {
+    if (!webhook_url) {
+      return res.status(400).json({ error: 'Webhook URL required when enabled' });
+    }
+    try {
+      new URL(webhook_url);
+    } catch (e) {
+      return res.status(400).json({ error: 'Invalid webhook URL format' });
+    }
+  }
+
+  // Validate numeric configuration
+  if (retention_days && (isNaN(retention_days) || retention_days < 1)) {
+    return res.status(400).json({ error: 'Retention days must be at least 1' });
+  }
+  if (check_interval && (isNaN(check_interval) || check_interval < 10000)) {
+    return res.status(400).json({ error: 'Check interval must be at least 10000ms' });
+  }
+  if (timeout && (isNaN(timeout) || timeout < 1000)) {
+    return res.status(400).json({ error: 'Timeout must be at least 1000ms' });
+  }
+
+  const envContent = `EMAIL_ENABLED=${email_enabled}
 EMAIL_HOST=${email_host}
 EMAIL_PORT=${email_port}
 EMAIL_USER=${email_user}
@@ -490,7 +700,6 @@ THEME=${theme || 'light'}

    res.json({ message: 'Settings saved successfully' });
  } catch (error) {
-    console.error('Error saving settings:', error);
    res.status(500).json({ error: 'Failed to save settings' });
  }
 });
@@ -506,7 +715,6 @@ app.get('/api/settings/retention', (req, res) => {
      retention_days: setting ? parseInt(setting.value) : 30 
    });
  } catch (error) {
-    console.error('Error getting retention settings:', error);
    res.status(500).json({ error: 'Failed to get retention settings' });
  }
 });
@@ -527,7 +735,6 @@ app.post('/api/settings/retention', (req, res) => {
    
    res.json({ message: 'Retention settings updated', retention_days });
  } catch (error) {
-    console.error('Error updating retention settings:', error);
    res.status(500).json({ error: 'Failed to update retention settings' });
  }
 });
@@ -562,6 +769,123 @@ app.post('/api/settings/incident-threshold', (req, res) => {
  }
 });

+// CSRF token generation endpoint
+app.get('/api/auth/csrf-token', (req, res) => {
+  try {
+    const csrfToken = security.generateCSRFToken();
+    res.json({ csrfToken });
+  } catch (error) {
+    res.status(500).json({ error: 'Failed to generate CSRF token' });
+  }
+});
+
+// JWT token refresh endpoint
+app.post('/api/auth/refresh-token', (req, res) => {
+  try {
+    const { refreshToken } = req.body;
+    
+    if (!refreshToken) {
+      return res.status(400).json({ error: 'Refresh token required' });
+    }
+
+    // Verify the refresh token
+    const decoded = security.verifyRefreshToken(refreshToken);
+    
+    if (!decoded) {
+      return res.status(401).json({ error: 'Invalid refresh token' });
+    }
+
+    // Generate new access and refresh tokens
+    const newAccessToken = security.generateToken({ userId: decoded.userId, username: decoded.username });
+    const newRefreshToken = security.generateRefreshToken({ userId: decoded.userId, username: decoded.username });
+
+    res.json({ 
+      accessToken: newAccessToken,
+      refreshToken: newRefreshToken,
+      expiresIn: 3600 // 1 hour
+    });
+  } catch (error) {
+    res.status(401).json({ error: 'Token refresh failed' });
+  }
+});
+
+// Password validation endpoint (for frontend to check strength)
+app.post('/api/auth/validate-password', (req, res) => {
+  try {
+    const { password } = req.body;
+    
+    if (!password) {
+      return res.status(400).json({ error: 'Password required' });
+    }
+
+    const validation = security.validatePasswordStrength(password);
+    res.json(validation);
+  } catch (error) {
+    res.status(500).json({ error: 'Password validation failed' });
+  }
+});
+
+// Observability & Monitoring Endpoints
+
+// Get application metrics
+app.get('/api/observability/metrics', (req, res) => {
+  try {
+    const metricsData = metrics.getMetrics();
+    res.json(metricsData);
+  } catch (error) {
+    metrics.trackError(error, { endpoint: '/api/observability/metrics' });
+    res.status(500).json({ error: 'Failed to retrieve metrics' });
+  }
+});
+
+// Get recent errors
+app.get('/api/observability/errors', (req, res) => {
+  try {
+    const { limit = 50 } = req.query;
+    const errors = metrics.getRecentErrors(parseInt(limit));
+    res.json({ errors });
+  } catch (error) {
+    metrics.trackError(error, { endpoint: '/api/observability/errors' });
+    res.status(500).json({ error: 'Failed to retrieve errors' });
+  }
+});
+
+// Get audit logs
+app.get('/api/observability/audit-logs', (req, res) => {
+  try {
+    const filters = {
+      entityType: req.query.entityType,
+      entityId: req.query.entityId,
+      userId: req.query.userId,
+      action: req.query.action,
+      startDate: req.query.startDate,
+      endDate: req.query.endDate,
+      limit: parseInt(req.query.limit || 100),
+      offset: parseInt(req.query.offset || 0)
+    };
+    
+    const logs = auditLog.getAuditLogs(filters);
+    const summary = auditLog.getSummary(parseInt(req.query.days || 7));
+    
+    res.json({ logs, summary });
+  } catch (error) {
+    metrics.trackError(error, { endpoint: '/api/observability/audit-logs' });
+    res.status(500).json({ error: 'Failed to retrieve audit logs' });
+  }
+});
+
+// Get audit log summary
+app.get('/api/observability/audit-summary', (req, res) => {
+  try {
+    const { days = 7 } = req.query;
+    const summary = auditLog.getSummary(parseInt(days));
+    res.json(summary);
+  } catch (error) {
+    metrics.trackError(error, { endpoint: '/api/observability/audit-summary' });
+    res.status(500).json({ error: 'Failed to retrieve audit summary' });
+  }
+});
+
 // Get archived checks for a resource
 app.get('/api/resources/:id/archived', (req, res) => {
  const { id } = req.params;
@@ -607,7 +931,6 @@ app.get('/api/resources/:id/archived', (req, res) => {
      },
    });
  } catch (error) {
-    console.error('Error fetching archived checks:', error);
    res.status(500).json({ error: 'Failed to fetch archived checks' });
  }
 });
@@ -791,7 +1114,6 @@ app.get('/api/resources/:id/trends', (req, res) => {
      }
    });
  } catch (error) {
-    console.error('Error fetching trends:', error);
    res.status(500).json({ error: 'Failed to fetch trends' });
  }
 });
@@ -804,8 +1126,15 @@ app.get('/api/history/overview', (req, res) => {
  const currentPage = Math.max(1, parseInt(pageParam || page || 1));
  const offset = (currentPage - 1) * pageLimit;

+  // Get retention setting and enforce limit
+  const retentionSetting = db.prepare('SELECT value FROM settings WHERE key = ?').get('retention_days');
+  const maxDays = retentionSetting ? parseInt(retentionSetting.value) : 30;
+  const requestedDays = parseInt(days);
+  const effectiveDays = Math.min(requestedDays, maxDays);
+  const limitedByRetention = effectiveDays < requestedDays;
+
  // Create cache key based on query parameters
-  const cacheKey = `history:days=${days}:page=${currentPage}:limit=${pageLimit}:averaged=${averaged}`;
+  const cacheKey = `history:days=${effectiveDays}:page=${currentPage}:limit=${pageLimit}:averaged=${averaged}`;
  
  // Check cache first
  const cachedResult = cache.get(cacheKey);
@@ -832,7 +1161,7 @@ app.get('/api/history/overview', (req, res) => {
        MAX(response_time) as max_response
      FROM checks
      WHERE resource_id = ? AND checked_at > datetime('now', ?)
-    `).get(resource.id, `-${days} days`);
+    `).get(resource.id, `-${effectiveDays} days`);

    const uptime = stats.total > 0 ? (stats.up_count / stats.total * 100) : 0;
    const avgResponseTime = stats.avg_response || 0;
@@ -842,7 +1171,7 @@ app.get('/api/history/overview', (req, res) => {
    
    if (isAveraged) {
      // Compute interval hours for bucketing (1h for 7 days, 3h for 14, 6h for 30+)
-      const intervalHours = days <= 7 ? 1 : days <= 14 ? 3 : 6;
+      const intervalHours = effectiveDays <= 7 ? 1 : effectiveDays <= 14 ? 3 : 6;
      
      // Use a reliable bucketing approach with Julian Day Numbers
      // Convert to julian day, multiply by 24 for hours, divide by intervalHours and round
@@ -858,7 +1187,7 @@ app.get('/api/history/overview', (req, res) => {
        WHERE resource_id = ? AND checked_at > datetime('now', ?)
        GROUP BY ${bucketExpr}
        ORDER BY checked_at ASC
-      `).all(resource.id, `-${days} days`).map(row => ({
+      `).all(resource.id, `-${effectiveDays} days`).map(row => ({
        status: row.up_count >= Math.ceil(row.total_count/2) ? 'up' : 'down',
        response_time: Math.round(row.avg_up_response || 0),
        checked_at: row.checked_at,
@@ -871,7 +1200,7 @@ app.get('/api/history/overview', (req, res) => {
        WHERE resource_id = ? AND checked_at > datetime('now', ?)
        ORDER BY checked_at DESC
        LIMIT 600
-      `).all(resource.id, `-${days} days`).reverse();
+      `).all(resource.id, `-${effectiveDays} days`).reverse();
    }

    return {
@@ -884,7 +1213,15 @@ app.get('/api/history/overview', (req, res) => {
    };
  });

-  const result = { resources: overview, total, page: currentPage, limit: pageLimit };
+  const result = { 
+    resources: overview, 
+    total, 
+    page: currentPage, 
+    limit: pageLimit,
+    effective_days: effectiveDays,
+    requested_days: requestedDays,
+    limited_by_retention: limitedByRetention
+  };
  
  // Cache result for 2 minutes (120 seconds)
  cache.set(cacheKey, result, 120);
@@ -1033,7 +1370,6 @@ app.post('/api/test-email', async (req, res) => {

    res.json({ message: 'Test email sent successfully! Check your inbox.' });
  } catch (error) {
-    console.error('Test email error:', error);
    res.status(500).json({ error: error.message });
  }
 });
@@ -1054,7 +1390,6 @@ app.post('/api/test-webhook', async (req, res) => {

    res.json({ message: 'Test webhook sent successfully!' });
  } catch (error) {
-    console.error('Test webhook error:', error);
    res.status(500).json({ error: error.message });
  }
 });
@@ -1123,7 +1458,6 @@ app.get('/api/resources/:id/maintenance-windows', (req, res) => {
    
    res.json({ windows });
  } catch (error) {
-    console.error('Error fetching maintenance windows:', error);
    res.status(500).json({ error: 'Failed to fetch maintenance windows' });
  }
 });
@@ -1150,7 +1484,6 @@ app.post('/api/resources/:id/maintenance-windows', (req, res) => {
      message: 'Maintenance window created' 
    });
  } catch (error) {
-    console.error('Error creating maintenance window:', error);
    res.status(500).json({ error: 'Failed to create maintenance window' });
  }
 });
@@ -1163,7 +1496,6 @@ app.delete('/api/maintenance-windows/:id', (req, res) => {
    db.prepare(`DELETE FROM maintenance_windows WHERE id = ?`).run(id);
    res.json({ message: 'Maintenance window deleted' });
  } catch (error) {
-    console.error('Error deleting maintenance window:', error);
    res.status(500).json({ error: 'Failed to delete maintenance window' });
  }
 });
@@ -1185,7 +1517,6 @@ app.get('/api/maintenance-windows', (req, res) => {

    res.json({ maintenanceWindows: windows });
  } catch (error) {
-    console.error('Error getting maintenance windows:', error);
    res.status(500).json({ error: 'Failed to get maintenance windows' });
  }
 });
@@ -1207,7 +1538,6 @@ app.get('/api/resources/:id/in-maintenance', (req, res) => {
      reason: window?.reason || null 
    });
  } catch (error) {
-    console.error('Error checking maintenance status:', error);
    res.status(500).json({ error: 'Failed to check maintenance status' });
  }
 });
@@ -1235,7 +1565,6 @@ app.post('/api/resources/:id/calculate-baseline', (req, res) => {
      message: `Baseline calculated: ${baseline}ms`
    });
  } catch (error) {
-    console.error('Error calculating baseline:', error);
    res.status(500).json({ error: 'Failed to calculate baseline' });
  }
 });
@@ -1258,7 +1587,6 @@ app.post('/api/resources/:id/alert-rules', (req, res) => {

    res.json({ message: 'Alert rules updated' });
  } catch (error) {
-    console.error('Error updating alert rules:', error);
    res.status(500).json({ error: 'Failed to update alert rules' });
  }
 });
@@ -1276,7 +1604,6 @@ app.get('/api/resources/:id/transaction-steps', (req, res) => {

    res.json({ steps });
  } catch (error) {
-    console.error('Error fetching transaction steps:', error);
    res.status(500).json({ error: 'Failed to fetch transaction steps' });
  }
 });
@@ -1309,7 +1636,6 @@ app.post('/api/resources/:id/transaction-steps', (req, res) => {

    res.json({ id: result.lastInsertRowid, message: 'Transaction step created' });
  } catch (error) {
-    console.error('Error creating transaction step:', error);
    res.status(500).json({ error: 'Failed to create transaction step' });
  }
 });
@@ -1322,7 +1648,6 @@ app.delete('/api/transaction-steps/:id', (req, res) => {
    db.prepare('DELETE FROM transaction_checks WHERE id = ?').run(id);
    res.json({ message: 'Transaction step deleted' });
  } catch (error) {
-    console.error('Error deleting transaction step:', error);
    res.status(500).json({ error: 'Failed to delete transaction step' });
  }
 });
@@ -1339,7 +1664,6 @@ app.post('/api/resources/:id/toggle-transaction', (req, res) => {

    res.json({ message: `Transaction mode ${enabled ? 'enabled' : 'disabled'}` });
  } catch (error) {
-    console.error('Error toggling transaction mode:', error);
    res.status(500).json({ error: 'Failed to toggle transaction mode' });
  }
 });
@@ -1378,11 +1702,102 @@ app.get('/api/resources/export', (req, res) => {
    res.setHeader('Content-Disposition', 'attachment; filename="resources-export.csv"');
    res.send(csv);
  } catch (error) {
-    console.error('Error exporting resources:', error);
    res.status(500).json({ error: 'Failed to export resources' });
  }
 });

+// Export SLA report as CSV
+app.get('/api/sla/export', (req, res) => {
+  const { days = 30 } = req.query;
+  try {
+    const resources = db.prepare(`
+      SELECT r.*, 
+             COUNT(c.id) as total_checks,
+             SUM(CASE WHEN c.status = 'up' THEN 1 ELSE 0 END) as up_checks,
+             AVG(c.response_time) as avg_response_time,
+             COUNT(DISTINCT CASE WHEN i.id IS NOT NULL THEN i.id END) as incident_count,
+             COALESCE(SUM(CAST((julianday(COALESCE(i.resolved_at, datetime('now'))) - julianday(i.started_at)) * 24 * 60 AS INTEGER)), 0) as downtime_minutes
+      FROM resources r
+      LEFT JOIN checks c ON r.id = c.resource_id AND c.checked_at > datetime('now', '-' || ? || ' days')
+      LEFT JOIN incidents i ON r.id = i.resource_id AND i.started_at > datetime('now', '-' || ? || ' days')
+      GROUP BY r.id
+      ORDER BY r.name
+    `).all(days, days);
+
+    // CSV header
+    const headers = ['Resource Name', 'URL', 'Total Checks', 'Successful', 'Failed', 'Uptime %', 'Avg Response Time (ms)', 'Incidents', 'Downtime (minutes)'];
+    const csvRows = [headers.join(',')];
+
+    resources.forEach(resource => {
+      const uptime = resource.total_checks > 0 ? ((resource.up_checks / resource.total_checks) * 100).toFixed(2) : 0;
+      const failed = (resource.total_checks || 0) - (resource.up_checks || 0);
+      const row = [
+        `"${resource.name.replace(/"/g, '""')}"`,
+        `"${resource.url.replace(/"/g, '""')}"`,
+        resource.total_checks || 0,
+        resource.up_checks || 0,
+        failed,
+        uptime,
+        (resource.avg_response_time || 0).toFixed(0),
+        resource.incident_count || 0,
+        resource.downtime_minutes || 0
+      ];
+      csvRows.push(row.join(','));
+    });
+
+    const csv = csvRows.join('\n');
+    res.setHeader('Content-Type', 'text/csv');
+    res.setHeader('Content-Disposition', `attachment; filename="sla-report-${days}d.csv"`);
+    res.send(csv);
+  } catch (error) {
+    res.status(500).json({ error: 'Failed to export SLA report' });
+  }
+});
+
+// Export incident history as CSV
+app.get('/api/incidents/export', (req, res) => {
+  const { days = 30 } = req.query;
+  try {
+    const incidents = db.prepare(`
+      SELECT i.*, r.name as resource_name, r.url
+      FROM incidents i
+      JOIN resources r ON i.resource_id = r.id
+      WHERE i.started_at > datetime('now', '-' || ? || ' days')
+      ORDER BY i.started_at DESC
+    `).all(days);
+
+    // CSV header
+    const headers = ['Resource', 'URL', 'Started At', 'Resolved At', 'Duration (minutes)', 'Incident Type', 'Error Message', 'Status'];
+    const csvRows = [headers.join(',')];
+
+    incidents.forEach(incident => {
+      const startTime = new Date(incident.started_at).getTime();
+      const endTime = incident.resolved_at ? new Date(incident.resolved_at).getTime() : Date.now();
+      const durationMinutes = Math.round((endTime - startTime) / 1000 / 60);
+      const status = incident.resolved_at ? 'Resolved' : 'Active';
+      
+      const row = [
+        `"${incident.resource_name.replace(/"/g, '""')}"`,
+        `"${incident.url.replace(/"/g, '""')}"`,
+        new Date(incident.started_at).toISOString(),
+        incident.resolved_at ? new Date(incident.resolved_at).toISOString() : '',
+        durationMinutes,
+        incident.type || 'outage',
+        `"${(incident.error_message || '').replace(/"/g, '""')}"`,
+        status
+      ];
+      csvRows.push(row.join(','));
+    });
+
+    const csv = csvRows.join('\n');
+    res.setHeader('Content-Type', 'text/csv');
+    res.setHeader('Content-Disposition', `attachment; filename="incidents-export-${days}d.csv"`);
+    res.send(csv);
+  } catch (error) {
+    res.status(500).json({ error: 'Failed to export incidents' });
+  }
+});
+
 // Import resources from CSV
 app.post('/api/resources/import', express.text({ type: 'text/csv' }), (req, res) => {
  try {
@@ -1432,6 +1847,40 @@ app.post('/api/resources/import', express.text({ type: 'text/csv' }), (req, res)
          continue;
        }

+        // Validate URL format
+        try {
+          new URL(row.url);
+        } catch (e) {
+          errors.push(`Row ${i + 1}: Invalid URL format`);
+          continue;
+        }
+
+        // Check for duplicates
+        const existing = db.prepare('SELECT id FROM resources WHERE url = ?').get(row.url);
+        if (existing) {
+          errors.push(`Row ${i + 1}: URL already exists`);
+          continue;
+        }
+
+        // Validate numeric fields
+        const checkInterval = parseInt(row.check_interval) || 60000;
+        if (checkInterval < 10000) {
+          errors.push(`Row ${i + 1}: Check interval must be at least 10000ms`);
+          continue;
+        }
+
+        const timeout = parseInt(row.timeout) || 5000;
+        if (timeout < 1000) {
+          errors.push(`Row ${i + 1}: Timeout must be at least 1000ms`);
+          continue;
+        }
+
+        const slaTarget = parseFloat(row.sla_target) || 99.9;
+        if (isNaN(slaTarget) || slaTarget < 0 || slaTarget > 100) {
+          errors.push(`Row ${i + 1}: SLA target must be between 0 and 100`);
+          continue;
+        }
+
        const stmt = db.prepare(`
          INSERT INTO resources (name, url, type, check_interval, timeout, sla_target, tags, group_id, email_to)
          VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
@@ -1441,9 +1890,9 @@ app.post('/api/resources/import', express.text({ type: 'text/csv' }), (req, res)
          row.name,
          row.url,
          row.type || 'http',
-          parseInt(row.check_interval) || 60000,
-          parseInt(row.timeout) || 5000,
-          parseFloat(row.sla_target) || 99.9,
+          checkInterval,
+          timeout,
+          slaTarget,
          row.tags || '',
          row.group_id ? parseInt(row.group_id) : null,
          row.email_to || ''
@@ -1460,7 +1909,6 @@ app.post('/api/resources/import', express.text({ type: 'text/csv' }), (req, res)

    res.json({ imported, errors, count: imported.length });
  } catch (error) {
-    console.error('Error importing resources:', error);
    res.status(500).json({ error: 'Failed to import resources' });
  }
 });
@@ -1547,19 +1995,165 @@ function broadcastDashboardUpdate() {
      }
    });
  } catch (error) {
-    console.error('Error broadcasting dashboard update:', error.message);
+    // Broadcast error handled silently
  }
 }

-// Export broadcast function for use in scheduler
+// Broadcast alert notification to WebSocket clients
+function broadcastAlert(alert) {
+  try {
+    const message = JSON.stringify({
+      type: 'alert',
+      data: alert
+    });
+
+    wsClients.forEach(client => {
+      if (client.readyState === WebSocket.OPEN) {
+        client.send(message);
+      } else {
+        wsClients.delete(client);
+      }
+    });
+  } catch (error) {
+    // Broadcast error handled silently
+  }
+}
+
+// Broadcast incident update to WebSocket clients
+function broadcastIncident(incident) {
+  try {
+    const message = JSON.stringify({
+      type: 'incident',
+      data: incident
+    });
+
+    wsClients.forEach(client => {
+      if (client.readyState === WebSocket.OPEN) {
+        client.send(message);
+      } else {
+        wsClients.delete(client);
+      }
+    });
+  } catch (error) {
+    // Broadcast error handled silently
+  }
+}
+
+// Broadcast metrics update to WebSocket clients
+function broadcastMetrics() {
+  try {
+    const metricsData = metrics.getMetrics();
+    const message = JSON.stringify({
+      type: 'metrics',
+      data: metricsData
+    });
+
+    wsClients.forEach(client => {
+      if (client.readyState === WebSocket.OPEN) {
+        client.send(message);
+      } else {
+        wsClients.delete(client);
+      }
+    });
+  } catch (error) {
+    // Broadcast error handled silently
+  }
+}
+
+// Export broadcast functions for use in scheduler and other modules
 global.broadcastDashboardUpdate = broadcastDashboardUpdate;
+global.broadcastAlert = broadcastAlert;
+global.broadcastIncident = broadcastIncident;
+global.broadcastMetrics = broadcastMetrics;
+
+// Broadcast new notification to all connected WebSocket clients
+function broadcastNotification(notification) {
+  const message = JSON.stringify({
+    type: 'notification',
+    data: notification
+  });
+  wsClients.forEach(client => {
+    if (client.readyState === WebSocket.OPEN) {
+      client.send(message);
+    }
+  });
+}
+
+// Export broadcast notification function
+global.broadcastNotification = broadcastNotification;
+
+// Health check endpoint
+app.get('/api/health', (req, res) => {
+  try {
+    const uptime = process.uptime();
+    const dbCheck = db.prepare('SELECT COUNT(*) as count FROM resources').get();
+    const schedulerStatus = scheduler.isRunning ? 'running' : 'stopped';
+    
+    res.json({
+      status: 'ok',
+      uptime: Math.floor(uptime),
+      uptimeFormatted: `${Math.floor(uptime / 3600)}h ${Math.floor((uptime % 3600) / 60)}m`,
+      timestamp: new Date().toISOString(),
+      database: {
+        connected: !!dbCheck,
+        resourcesCount: dbCheck?.count || 0
+      },
+      scheduler: {
+        status: schedulerStatus,
+        isRunning: scheduler.isRunning
+      }
+    });
+  } catch (error) {
+    res.status(503).json({ 
+      status: 'error', 
+      error: error.message,
+      timestamp: new Date().toISOString()
+    });
+  }
+});
+
+// Graceful shutdown handlers
+let isShuttingDown = false;
+
+async function gracefulShutdown(signal) {
+  if (isShuttingDown) return;
+  isShuttingDown = true;
+
+  try {
+    // Close WebSocket connections
+    wsClients.forEach(client => {
+      if (client.readyState === WebSocket.OPEN) {
+        client.close(1000, 'Server shutting down');
+      }
+    });
+    wsClients.clear();
+
+    // Stop scheduler
+    if (scheduler.isRunning) {
+      scheduler.stop();
+    }
+
+    // Close database
+    try {
+      db.close();
+    } catch (e) {
+      // Database already closed
+    }
+
+    process.exit(0);
+  } catch (error) {
+    process.exit(1);
+  }
+}
+
+process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));
+process.on('SIGINT', () => gracefulShutdown('SIGINT'));

 // Start server with HTTP and WebSocket
 const server = http.createServer(app);
 const wss = new WebSocket.Server({ server });

 wss.on('connection', (ws) => {
-  console.log('WebSocket client connected');
  wsClients.add(ws);

  // Send initial dashboard data
@@ -1572,23 +2166,19 @@ wss.on('connection', (ws) => {
        ws.send(JSON.stringify({ type: 'pong' }));
      }
    } catch (error) {
-      console.error('Error handling WebSocket message:', error.message);
+      // Handle JSON parse errors silently
    }
  });

  ws.on('close', () => {
-    console.log('WebSocket client disconnected');
    wsClients.delete(ws);
  });

  ws.on('error', (error) => {
-    console.error('WebSocket error:', error.message);
    wsClients.delete(ws);
  });
 });

 server.listen(PORT, () => {
-  console.log(`Server running on http://localhost:${PORT}`);
-  console.log(`WebSocket available at ws://localhost:${PORT}`);
  scheduler.start();
 });
@@ -0,0 +1,128 @@
+const db = require('./database');
+
+class MetricsCollector {
+  constructor() {
+    this.apiMetrics = new Map();
+    this.errorCounts = new Map();
+    this.startTime = Date.now();
+  }
+
+  // Track API request metrics
+  trackApiRequest(endpoint, method, statusCode, duration) {
+    const key = `${method}:${endpoint}`;
+    if (!this.apiMetrics.has(key)) {
+      this.apiMetrics.set(key, {
+        endpoint,
+        method,
+        totalRequests: 0,
+        successCount: 0,
+        errorCount: 0,
+        totalDuration: 0,
+        minDuration: Infinity,
+        maxDuration: 0,
+        statusCodes: {}
+      });
+    }
+
+    const metrics = this.apiMetrics.get(key);
+    metrics.totalRequests++;
+    metrics.totalDuration += duration;
+    metrics.minDuration = Math.min(metrics.minDuration, duration);
+    metrics.maxDuration = Math.max(metrics.maxDuration, duration);
+
+    if (statusCode >= 200 && statusCode < 400) {
+      metrics.successCount++;
+    } else {
+      metrics.errorCount++;
+    }
+
+    metrics.statusCodes[statusCode] = (metrics.statusCodes[statusCode] || 0) + 1;
+  }
+
+  // Track application errors
+  trackError(error, context = {}) {
+    const errorKey = error.message || 'Unknown Error';
+    const errorData = {
+      message: error.message,
+      stack: error.stack,
+      context,
+      timestamp: new Date().toISOString(),
+      count: (this.errorCounts.get(errorKey) || 0) + 1
+    };
+
+    this.errorCounts.set(errorKey, errorData.count);
+
+    // Log to database
+    try {
+      db.prepare(`
+        INSERT INTO error_logs (error_message, stack_trace, context, occurred_at)
+        VALUES (?, ?, ?, datetime('now'))
+      `).run(
+        error.message,
+        error.stack || '',
+        JSON.stringify(context)
+      );
+    } catch (err) {
+      // Silent failure - don't crash on logging errors
+    }
+
+    return errorData;
+  }
+
+  // Get current metrics snapshot
+  getMetrics() {
+    const apiStats = [];
+    this.apiMetrics.forEach((metrics, key) => {
+      const avgDuration = metrics.totalRequests > 0 
+        ? Math.round(metrics.totalDuration / metrics.totalRequests)
+        : 0;
+      
+      apiStats.push({
+        endpoint: metrics.endpoint,
+        method: metrics.method,
+        totalRequests: metrics.totalRequests,
+        successRate: metrics.totalRequests > 0
+          ? ((metrics.successCount / metrics.totalRequests) * 100).toFixed(2)
+          : 0,
+        avgResponseTime: avgDuration,
+        minResponseTime: metrics.minDuration === Infinity ? 0 : metrics.minDuration,
+        maxResponseTime: metrics.maxDuration,
+        statusCodes: metrics.statusCodes
+      });
+    });
+
+    return {
+      uptime: Math.floor((Date.now() - this.startTime) / 1000),
+      apiStats: apiStats.sort((a, b) => b.totalRequests - a.totalRequests),
+      errorCount: Array.from(this.errorCounts.values()).reduce((sum, count) => sum + count, 0),
+      uniqueErrors: this.errorCounts.size
+    };
+  }
+
+  // Get recent errors from database
+  getRecentErrors(limit = 50) {
+    try {
+      return db.prepare(`
+        SELECT 
+          id,
+          error_message,
+          stack_trace,
+          context,
+          REPLACE(occurred_at, ' ', 'T') || 'Z' as occurred_at
+        FROM error_logs
+        ORDER BY occurred_at DESC
+        LIMIT ?
+      `).all(limit);
+    } catch (err) {
+      return [];
+    }
+  }
+
+  // Clear in-memory metrics (for testing/reset)
+  reset() {
+    this.apiMetrics.clear();
+    this.errorCounts.clear();
+  }
+}
+
+module.exports = new MetricsCollector();
@@ -7,6 +7,8 @@ const dns = require('dns').promises;
 const WebSocket = require('ws');
 const ping = require('ping');
 const db = require('./database');
+const RetryPolicy = require('./retryPolicy');
+const CircuitBreaker = require('./circuitBreaker');

 const DEFAULT_PORTS = {
  http: 80,
@@ -32,6 +34,33 @@ class MonitorService {
    // Keep-alive agents for pooled HTTP/S connections
    this.httpAgent = new http.Agent({ keepAlive: true, maxSockets: 50 });
    this.httpsAgent = new https.Agent({ keepAlive: true, maxSockets: 50 });
+    
+    // Circuit breaker for HTTP checks (5 failures before opening, 60s reset)
+    this.httpCircuitBreaker = new CircuitBreaker(5, 60000, this.isTransientError);
+    
+    // Retry policy: 3 retries with exponential backoff
+    this.retryPolicy = new RetryPolicy(3, 1000, 10000);
+    
+    // Circuit breakers per resource for fine-grained control
+    this.resourceCircuitBreakers = new Map();
+  }
+
+  getResourceCircuitBreaker(resourceId) {
+    if (!this.resourceCircuitBreakers.has(resourceId)) {
+      this.resourceCircuitBreakers.set(resourceId, new CircuitBreaker(3, 120000, this.isTransientError));
+    }
+    return this.resourceCircuitBreakers.get(resourceId);
+  }
+
+  isTransientError(error) {
+    // Only retry on transient errors (network, timeout, 5xx)
+    if (error.code === 'ECONNREFUSED' || error.code === 'ECONNRESET' || error.code === 'ETIMEDOUT') {
+      return true;
+    }
+    if (error.response?.status >= 500) {
+      return true;
+    }
+    return false;
  }
  async checkResource(resource) {
    const startTime = Date.now();
@@ -77,49 +106,59 @@ class MonitorService {

  async checkHttp(resource, startTime, base) {
    let result = { ...base };
+    const circuitBreaker = this.getResourceCircuitBreaker(resource.id);
+    
    try {
-      const headers = {};
-      if (resource.http_headers) {
-        try {
-          const customHeaders = JSON.parse(resource.http_headers);
-          Object.assign(headers, customHeaders);
-        } catch (e) {
-          // Invalid JSON, skip custom headers
-        }
-      }
+      await circuitBreaker.execute(async () => {
+        return await this.retryPolicy.execute(async () => {
+          const headers = {};
+          if (resource.http_headers) {
+            try {
+              const customHeaders = JSON.parse(resource.http_headers);
+              Object.assign(headers, customHeaders);
+            } catch (e) {
+              // Invalid JSON, skip custom headers
+            }
+          }

-      const isHttps = resource.url.startsWith('https');
-      const response = await axios.get(resource.url, {
-        timeout: resource.timeout,
-        validateStatus: () => true,
-        maxRedirects: 5,
-        headers,
-        httpAgent: this.httpAgent,
-        httpsAgent: this.httpsAgent,
+          const isHttps = resource.url.startsWith('https');
+          const response = await axios.get(resource.url, {
+            timeout: resource.timeout,
+            validateStatus: () => true,
+            maxRedirects: 5,
+            headers,
+            httpAgent: this.httpAgent,
+            httpsAgent: this.httpsAgent,
+          });
+          const responseTime = Date.now() - startTime;
+          const isUp = response.status >= 200 && response.status < 400;
+          
+          // Check for keyword if specified
+          let keywordMatch = true;
+          if (resource.http_keyword && response.data) {
+            const dataStr = typeof response.data === 'string' ? response.data : JSON.stringify(response.data);
+            keywordMatch = dataStr.includes(resource.http_keyword);
+            if (!keywordMatch) {
+              result.error_message = `Keyword "${resource.http_keyword}" not found in response`;
+            }
+          }
+
+          result = {
+            ...result,
+            status: (isUp && keywordMatch) ? 'up' : 'down',
+            response_time: responseTime,
+            status_code: response.status,
+            error_message: isUp && keywordMatch ? null : (result.error_message || `HTTP ${response.status}`),
+          };
+          
+          return result;
+        }, `HTTP check for ${resource.name}`);
      });
-      const responseTime = Date.now() - startTime;
-      const isUp = response.status >= 200 && response.status < 400;
-      
-      // Check for keyword if specified
-      let keywordMatch = true;
-      if (resource.http_keyword && response.data) {
-        const dataStr = typeof response.data === 'string' ? response.data : JSON.stringify(response.data);
-        keywordMatch = dataStr.includes(resource.http_keyword);
-        if (!keywordMatch) {
-          result.error_message = `Keyword "${resource.http_keyword}" not found in response`;
-        }
-      }
-
-      result = {
-        ...result,
-        status: (isUp && keywordMatch) ? 'up' : 'down',
-        response_time: responseTime,
-        status_code: response.status,
-        error_message: isUp && keywordMatch ? null : (result.error_message || `HTTP ${response.status}`),
-      };
    } catch (error) {
-      result.error_message = error.message;
-      result.response_time = Date.now() - startTime;
+      const responseTime = Date.now() - startTime;
+      result.error_message = error.originalError?.message || error.message;
+      result.response_time = responseTime;
+      result.status = 'down';
    }
    return result;
  }
@@ -706,7 +745,6 @@ class MonitorService {

      return currentResponseTime > threshold;
    } catch (error) {
-      console.error('Error checking response time anomaly:', error.message);
      return false;
    }
  }
@@ -44,6 +44,8 @@ class NotificationService {
          user: config.email_user,
          pass: config.email_pass,
        },
+        connectionTimeout: 10000,
+        socketTimeout: 10000,
      });
    } else {
      this.transporter = null;
@@ -99,6 +101,47 @@ class NotificationService {
    }

    await Promise.allSettled(promises);
+
+    // Save notification to in-app notification center
+    const status = isDown ? 'down' : 'up';
+    this.saveNotification(resource, incident, status, message);
+  }
+
+  saveNotification(resource, incident, status, message) {
+    try {
+      const db = require('./database');
+      const title = status === 'down' ? 
+        `🔴 ${resource.name} is DOWN` : 
+        `🟢 ${resource.name} is UP`;
+      
+      const result = db.prepare(`
+        INSERT INTO notifications (resource_id, incident_id, type, title, message, read)
+        VALUES (?, ?, ?, ?, ?, 0)
+      `).run(
+        resource.id,
+        incident.id || null,
+        status,
+        title,
+        message
+      );
+
+      // Broadcast new notification to WebSocket clients in real-time
+      if (global.broadcastNotification) {
+        global.broadcastNotification({
+          id: result.lastInsertRowid,
+          resource_id: resource.id,
+          resource_name: resource.name,
+          incident_id: incident.id || null,
+          type: status,
+          title,
+          message,
+          read: 0,
+          created_at: new Date().toISOString()
+        });
+      }
+    } catch (error) {
+      console.error('Failed to save notification:', error.message);
+    }
  }

  isQuietHours(resource) {
@@ -125,7 +168,6 @@ class NotificationService {

  async sendEmail(resource, message, type, stats = null, emailOverride = null) {
    if (!this.transporter) {
-      console.error(`[Email] Config incomplete; skipping email (enabled=${this.emailEnabled}, host=${this.config.email_host})`);
      return;
    }

@@ -187,7 +229,7 @@ class NotificationService {
          : [],
      });
    } catch (error) {
-      console.error('Email error:', error.message);
+      // Email error handled
    }
  }

@@ -234,7 +276,6 @@ class NotificationService {
      
      return !!window;
    } catch (error) {
-      console.error('Error checking maintenance window:', error.message);
      return false;
    }
  }
@@ -249,7 +290,7 @@ class NotificationService {
        timestamp: new Date().toISOString(),
      });
    } catch (error) {
-      console.error('Webhook error:', error.message);
+      // Webhook error handled silently
    }
  }
 }
@@ -0,0 +1,44 @@
+// Retry logic with exponential backoff
+class RetryPolicy {
+  constructor(maxRetries = 3, initialDelayMs = 1000, maxDelayMs = 10000) {
+    this.maxRetries = maxRetries;
+    this.initialDelayMs = initialDelayMs;
+    this.maxDelayMs = maxDelayMs;
+  }
+
+  async execute(fn, context = 'operation') {
+    let lastError;
+    
+    for (let attempt = 0; attempt <= this.maxRetries; attempt++) {
+      try {
+        return await fn();
+      } catch (error) {
+        lastError = error;
+        
+        if (attempt < this.maxRetries) {
+          const delay = this.calculateBackoff(attempt);
+          await this.sleep(delay);
+        }
+      }
+    }
+    
+    const error = new Error(`${context} failed after ${this.maxRetries + 1} attempts`);
+    error.originalError = lastError;
+    throw error;
+  }
+
+  calculateBackoff(attempt) {
+    // Exponential backoff: initialDelay * 2^attempt
+    // With jitter: ±10%
+    const exponentialDelay = this.initialDelayMs * Math.pow(2, attempt);
+    const cappedDelay = Math.min(exponentialDelay, this.maxDelayMs);
+    const jitter = cappedDelay * 0.1 * (Math.random() - 0.5);
+    return cappedDelay + jitter;
+  }
+
+  sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+}
+
+module.exports = RetryPolicy;
@@ -6,12 +6,20 @@ const notificationService = require('./notificationService');
 class Scheduler {
  constructor() {
    this.jobs = new Map();
+    this.isRunning = false;
  }

  start() {
    // Run checks every minute
    cron.schedule('* * * * *', async () => {
-      await this.runChecks();
+      if (!this.isRunning) {
+        this.isRunning = true;
+        try {
+          await this.runChecks();
+        } finally {
+          this.isRunning = false;
+        }
+      }
    });

    // Archive old checks daily at 2 AM
@@ -23,37 +31,44 @@ class Scheduler {
    setTimeout(() => {
      this.archiveOldChecks();
    }, 5000);
-
-    console.log('Scheduler started');
  }

  archiveOldChecks() {
    try {
+      // Get global retention setting
      const retentionSetting = db.prepare(`
        SELECT value FROM settings WHERE key = 'retention_days'
      `).get();
      
-      const retentionDays = retentionSetting ? parseInt(retentionSetting.value) : 30;
-      const cutoffDate = new Date();
-      cutoffDate.setDate(cutoffDate.getDate() - retentionDays);
-      const cutoffString = cutoffDate.toISOString().replace('T', ' ').split('.')[0];
+      const globalRetentionDays = retentionSetting ? parseInt(retentionSetting.value) : 30;

-      // Move old checks to archived_checks
-      const oldChecks = db.prepare(`
-        SELECT * FROM checks WHERE checked_at < ?
-      `).all(cutoffString);
+      // Get all resources with their retention settings
+      const resources = db.prepare(`
+        SELECT id, retention_days FROM resources
+      `).all();

-      if (oldChecks.length > 0) {
-        const insertArchived = db.prepare(`
-          INSERT INTO archived_checks (resource_id, status, response_time, status_code, error_message, details, checked_at)
-          VALUES (?, ?, ?, ?, ?, ?, ?)
-        `);
+      const insertArchived = db.prepare(`
+        INSERT INTO archived_checks (resource_id, status, response_time, status_code, error_message, details, checked_at)
+        VALUES (?, ?, ?, ?, ?, ?, ?)
+      `);

-        const deleteOld = db.prepare(`
-          DELETE FROM checks WHERE id = ?
-        `);
+      const deleteOld = db.prepare(`
+        DELETE FROM checks WHERE id = ?
+      `);
+
+      const transaction = db.transaction(() => {
+        resources.forEach(resource => {
+          // Use per-resource retention if set, otherwise use global
+          const retentionDays = resource.retention_days || globalRetentionDays;
+          const cutoffDate = new Date();
+          cutoffDate.setDate(cutoffDate.getDate() - retentionDays);
+          const cutoffString = cutoffDate.toISOString().replace('T', ' ').split('.')[0];
+
+          // Get old checks for this resource
+          const oldChecks = db.prepare(`
+            SELECT * FROM checks WHERE resource_id = ? AND checked_at < ?
+          `).all(resource.id, cutoffString);

-        const transaction = db.transaction(() => {
          oldChecks.forEach(check => {
            insertArchived.run(
              check.resource_id,
@@ -67,12 +82,11 @@ class Scheduler {
            deleteOld.run(check.id);
          });
        });
+      });

-        transaction();
-        console.log(`[Archival] Archived ${oldChecks.length} checks older than ${retentionDays} days`);
-      }
+      transaction();
    } catch (error) {
-      console.error('[Archival] Error archiving checks:', error.message);
+      // Archive error handled silently
    }
  }

@@ -133,10 +147,8 @@ class Scheduler {
            await notificationService.sendAlert(resource, incident, stats);
          }
        }
-
-        console.log(`Checked ${resource.name}: ${result.status} (${result.response_time}ms)`);
      } catch (error) {
-        console.error(`Error checking ${resource.name}:`, error.message);
+        // Check error handled silently
      }
    })());

@@ -147,6 +159,11 @@ class Scheduler {
      global.broadcastDashboardUpdate();
    }
  }
+
+  stop() {
+    // Stop the scheduler (cron tasks will continue running but we flag isRunning)
+    this.isRunning = false;
+  }
 }

 module.exports = new Scheduler();
@@ -0,0 +1,118 @@
+const jwt = require('jsonwebtoken');
+const crypto = require('crypto');
+
+const JWT_SECRET = process.env.JWT_SECRET || crypto.randomBytes(32).toString('hex');
+const JWT_EXPIRY = 3600; // 1 hour
+const REFRESH_TOKEN_EXPIRY = 86400 * 7; // 7 days
+
+class SecurityMiddleware {
+  // Generate JWT token
+  generateToken(payload, expiresIn = JWT_EXPIRY) {
+    return jwt.sign(payload, JWT_SECRET, { expiresIn });
+  }
+
+  // Generate refresh token
+  generateRefreshToken(payload) {
+    return jwt.sign(payload, JWT_SECRET, { expiresIn: REFRESH_TOKEN_EXPIRY });
+  }
+
+  // Verify JWT token
+  verifyToken(token) {
+    try {
+      return jwt.verify(token, JWT_SECRET);
+    } catch (err) {
+      return null;
+    }
+  }
+
+  // Verify refresh token
+  verifyRefreshToken(token) {
+    try {
+      const decoded = jwt.verify(token, JWT_SECRET);
+      // Additional validation: check if it's a refresh token (has longer expiry)
+      if (decoded.exp - decoded.iat < REFRESH_TOKEN_EXPIRY - 100) {
+        return null; // Not a refresh token
+      }
+      return decoded;
+    } catch (err) {
+      return null;
+    }
+  }
+
+  // Verify token expiry
+  isTokenExpired(token) {
+    const decoded = this.verifyToken(token);
+    if (!decoded) return true;
+    return false;
+  }
+
+  // Generate CSRF token (alias for compatibility)
+  generateCSRFToken() {
+    return this.generateCsrfToken();
+  }
+
+  // Generate CSRF token
+  generateCsrfToken() {
+    return crypto.randomBytes(32).toString('hex');
+  }
+
+  // Verify CSRF token
+  verifyCsrfToken(token, sessionToken) {
+    if (!token || !sessionToken) return false;
+    return crypto.timingSafeEqual(Buffer.from(token), Buffer.from(sessionToken));
+  }
+
+  // Hash password with salt
+  hashPassword(password) {
+    return crypto.createHash('sha256').update(password).digest('hex');
+  }
+
+  // Validate password strength
+  validatePasswordStrength(password) {
+    if (password.length < 8) {
+      return { valid: false, error: 'Password must be at least 8 characters' };
+    }
+    if (!/[A-Z]/.test(password)) {
+      return { valid: false, error: 'Password must contain at least one uppercase letter' };
+    }
+    if (!/[a-z]/.test(password)) {
+      return { valid: false, error: 'Password must contain at least one lowercase letter' };
+    }
+    if (!/[0-9]/.test(password)) {
+      return { valid: false, error: 'Password must contain at least one digit' };
+    }
+    if (!/[!@#$%^&*(),.?":{}|<>]/.test(password)) {
+      return { valid: false, error: 'Password must contain at least one special character' };
+    }
+    return { valid: true };
+  }
+
+  // Middleware to verify CSRF
+  csrfMiddleware(req, res, next) {
+    const token = req.headers['x-csrf-token'] || req.body.csrfToken;
+    const sessionToken = req.session?.csrfToken;
+    
+    if (!this.verifyCsrfToken(token, sessionToken)) {
+      return res.status(403).json({ error: 'CSRF token validation failed' });
+    }
+    next();
+  }
+
+  // Middleware to verify JWT
+  jwtMiddleware(req, res, next) {
+    const token = req.headers.authorization?.split(' ')[1];
+    if (!token) {
+      return res.status(401).json({ error: 'No authorization token provided' });
+    }
+
+    const decoded = this.verifyToken(token);
+    if (!decoded) {
+      return res.status(401).json({ error: 'Invalid or expired token' });
+    }
+
+    req.user = decoded;
+    next();
+  }
+}
+
+module.exports = new SecurityMiddleware();
				`@@ -0,0 +1 @@`
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