Feature: Multi-email alerts and move resource between groups

- notificationService: Parse comma-separated emails from resource.email_to or global config; validate and send to each recipient
- API: Add PATCH /api/resources/:id/group endpoint to move resource between groups with validation and cache invalidation
- UI: Add group selector to edit modal; wire group change to PATCH endpoint; add help text for multi-email format

client/build/asset-manifest.json

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 {
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-    "main.js": "/static/js/main.9a96e479.js",
+    "main.js": "/static/js/main.b7b055d1.js",
     "static/js/453.d456ce70.chunk.js": "/static/js/453.d456ce70.chunk.js",
     "index.html": "/index.html",
     "main.2e6b09f5.css.map": "/static/css/main.2e6b09f5.css.map",
-    "main.9a96e479.js.map": "/static/js/main.9a96e479.js.map",
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+    "static/js/main.b7b055d1.js"
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client/build/index.html

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-<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="/favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="SkyWatch - Infrastructure monitoring and alerting system"/><link rel="apple-touch-icon" href="/logo192.png"/><link rel="manifest" href="/manifest.json"/><title>SkyWatch</title><script defer="defer" src="/static/js/main.9a96e479.js"></script><link href="/static/css/main.2e6b09f5.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
+<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="/favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="SkyWatch - Infrastructure monitoring and alerting system"/><link rel="apple-touch-icon" href="/logo192.png"/><link rel="manifest" href="/manifest.json"/><title>SkyWatch</title><script defer="defer" src="/static/js/main.b7b055d1.js"></script><link href="/static/css/main.2e6b09f5.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>

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-//# sourceMappingURL=main.9a96e479.js.map
+//# sourceMappingURL=main.b7b055d1.js.map

client/build/static/js/main.b7b055d1.js.map

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client/src/App.js

@@ -176,6 +176,16 @@ function Dashboard() {
 
   const handleEditResource = async (id) => {
     try {
+      const resource = resources.find(r => r.id === id);
+      
+      // Handle group change via PATCH if group_id changed
+      if (editData.group_id !== resource?.group_id) {
+        await axios.patch(`/api/resources/${id}/group`, { 
+          group_id: editData.group_id || null 
+        });
+      }
+      
+      // Update other fields via PUT
       await axios.put(`/api/resources/${id}`, editData);
       setShowEditModal(false);
       setEditData({});
@@ -891,6 +901,19 @@ function Dashboard() {
                 />
               </div>
 
+              <div className="form-group">
+                <label>Group</label>
+                <select
+                  value={editData.group_id || ''}
+                  onChange={(e) => setEditData({ ...editData, group_id: e.target.value ? parseInt(e.target.value) : null })}
+                >
+                  <option value="">Ungrouped</option>
+                  {groups.map((g) => (
+                    <option key={g.id} value={g.id}>{g.name}</option>
+                  ))}
+                </select>
+              </div>
+
               <div className="form-group">
                 <label>Alert Email Address (Optional)</label>
                 <input
@@ -899,6 +922,7 @@ function Dashboard() {
                   value={editData.email_to || ''}
                   onChange={(e) => setEditData({ ...editData, email_to: e.target.value })}
                 />
+                <small style={{ color: '#666', fontSize: '0.85rem' }}>Comma-separated emails: alice@example.com,bob@example.com</small>
               </div>
 
               <div className="form-group">

server/database.js

@@ -113,8 +113,9 @@ db.exec(`
 
   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 DESC);
+  CREATE INDEX IF NOT EXISTS idx_checks_resource_checked ON checks(resource_id, checked_at);
   CREATE INDEX IF NOT EXISTS idx_incidents_resource_id ON incidents(resource_id);
+  CREATE INDEX IF NOT EXISTS idx_incidents_resource_started ON incidents(resource_id, started_at);
   CREATE INDEX IF NOT EXISTS idx_incidents_resolved ON incidents(resource_id, resolved_at);
   CREATE INDEX IF NOT EXISTS idx_resources_group_id ON resources(group_id);
   CREATE INDEX IF NOT EXISTS idx_maintenance_windows_resource ON maintenance_windows(resource_id);

server/index.js

@@ -219,6 +219,42 @@ app.put('/api/resources/:id', (req, res) => {
   res.json({ message: 'Resource updated' });
 });
 
+// Move a resource to a different group
+app.patch('/api/resources/:id/group', (req, res) => {
+  try {
+    const id = parseInt(req.params.id, 10);
+    const { group_id } = req.body;
+    if (!Number.isInteger(id)) {
+      return res.status(400).json({ error: 'Invalid resource id' });
+    }
+    if (group_id === undefined || group_id === null || group_id === '') {
+      return res.status(400).json({ error: 'group_id is required' });
+    }
+    const gid = parseInt(group_id, 10);
+    if (!Number.isInteger(gid)) {
+      return res.status(400).json({ error: 'Invalid group_id' });
+    }
+
+    const stmt = db.prepare('UPDATE resources SET group_id = ? WHERE id = ?');
+    const info = stmt.run(gid, id);
+    if (info.changes === 0) {
+      return res.status(404).json({ error: 'Resource not found' });
+    }
+
+    // Invalidate caches and broadcast update
+    cache.invalidatePattern('history:');
+    cache.invalidatePattern('sla:');
+    if (global.broadcastDashboardUpdate) {
+      try { global.broadcastDashboardUpdate(); } catch {}
+    }
+
+    const updated = db.prepare('SELECT * FROM resources WHERE id = ?').get(id);
+    res.json(updated);
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to update group', details: String(err) });
+  }
+});
+
 // Delete resource
 app.delete('/api/resources/:id', (req, res) => {
   db.prepare('DELETE FROM resources WHERE id = ?').run(req.params.id);

server/monitorService.js

@@ -1,4 +1,6 @@
 const axios = require('axios');
+const http = require('http');
+const https = require('https');
 const net = require('net');
 const tls = require('tls');
 const dns = require('dns').promises;
@@ -26,6 +28,11 @@ function parseHostPort(urlString, fallbackPort) {
 }
 
 class MonitorService {
+  constructor() {
+    // 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 });
+  }
   async checkResource(resource) {
     const startTime = Date.now();
     const base = {
@@ -81,11 +88,14 @@ class MonitorService {
         }
       }
 
+      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;

server/notificationService.js

@@ -76,8 +76,17 @@ class NotificationService {
     const promises = [];
 
     // Use resource-specific email if provided, otherwise fall back to global config
-    if (this.emailEnabled && (resource.email_to || this.config.email_to)) {
+      if (this.emailEnabled && (resource.email_to || this.config.email_to)) {
-      promises.push(this.sendEmail(resource, message, incident.type, stats));
+        const targetsCsv = resource.email_to || this.config.email_to;
+        const targets = String(targetsCsv)
+          .split(',')
+          .map(t => t.trim())
+          .filter(t => t && /.+@.+\..+/.test(t));
+        if (targets.length > 0) {
+          for (const email of targets) {
+            promises.push(this.sendEmail(resource, message, incident.type, stats, email));
+          }
+        }
     } else {
       if (!this.emailEnabled) {
         // Email globally disabled
@@ -158,7 +167,7 @@ class NotificationService {
       htmlContent += `</div>`;
 
       // Use resource-specific email if provided, otherwise use global config
-      const emailTo = resource.email_to || this.config.email_to;
+      const emailTo = emailOverride || resource.email_to || this.config.email_to;
       
       await this.transporter.sendMail({
         from: this.config.email_from,

server/scheduler.js

@@ -92,6 +92,29 @@ class Scheduler {
         const result = await monitorService.checkResource(resource);
         monitorService.saveCheck(result);
 
+        // Rolling cap per resource (configurable via settings; default 10000)
+        try {
+          const capSetting = db.prepare(`SELECT value FROM settings WHERE key = 'checks_cap_per_resource'`).get();
+          const cap = capSetting ? parseInt(capSetting.value) : 10000;
+          if (Number.isFinite(cap) && cap > 0) {
+            // Delete oldest rows beyond cap, using id ordering per resource
+            db.prepare(`
+              DELETE FROM checks
+              WHERE id IN (
+                SELECT id FROM checks
+                WHERE resource_id = ?
+                ORDER BY id ASC
+                LIMIT (
+                  SELECT MAX(COUNT(*) - ?, 0)
+                  FROM checks WHERE resource_id = ?
+                )
+              )
+            `).run(resource.id, cap, resource.id);
+          }
+        } catch (e) {
+          // Non-fatal
+        }
+
         const incident = monitorService.handleIncident(
           resource.id,
           result.status === 'down'