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function(event) {\n console.log('Push notification received:', event);\n \n let data = { title: 'Server Status', body: 'Notification received' };\n \n if (event.data) {\n try {\n data = event.data.json();\n } catch (e) {\n data.body = event.data.text();\n }\n }\n \n const options = {\n body: data.body,\n icon: data.icon || '/icon-192.png',\n badge: data.badge || '/badge-96.png',\n vibrate: [200, 100, 200],\n timestamp: data.timestamp || Date.now(),\n requireInteraction: true,\n actions: [\n { action: 'view', title: 'View Status' },\n { action: 'close', title: 'Close' }\n ]\n };\n \n event.waitUntil(\n self.registration.showNotification(data.title, options)\n );\n});\n\nself.addEventListener('notificationclick', function(event) {\n console.log('Notification clicked:', event.action);\n \n event.notification.close();\n \n if (event.action === 'view' || !event.action) {\n event.waitUntil(\n clients.openWindow('/')\n );\n }\n});\n\nself.addEventListener('install', function(event) {\n console.log('Service Worker installing...');\n self.skipWaiting();\n});\n\nself.addEventListener('activate', function(event) {\n console.log('Service Worker activating...');\n event.waitUntil(clients.claim());\n});\n","createdAt",["D",1771315448635],"branchVersion","branchId","c6c88a12-0ba8-11f1-bece-42dde27851f2","id","c6c7fe26-0ba8-11f1-bece-42dde27851f2","heartbeat",["D",1771295494247],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","imageUrl","cea41dc4-b4c3-4a38-8ee6-ee9b5960fda2","pinnedFileId","pinPreview","pinMigrated","screenshotVersion","likeCount",0,"orgId","dbeafde9-66b9-4cff-8625-2da1195a1c5d","tursoName","c6c7fe260ba811f1bece42dde27851f2","tursoHostname","c6c7fe260ba811f1bece42dde27851f2-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789519256886],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_95":94,"_102":98},"org",{"_95":94,"_96":-5,"_97":98,"_18":52,"_99":100,"_101":26},"branch",{"_13":84,"_32":85,"_41":40,"_86":42,"_87":-5,"_88":-5,"_89":-5,"_90":-5,"_91":-5,"_92":43,"_93":94},"isOwned",59,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","halffullheart","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoicHJveHkiLCJzcmMiOiJodHRwczovL2ltYWdlcy5jbGVyay5kZXYvb2F1dGhfZ2l0aHViL2ltZ18yaGQyZVFDeXM0U3YzNkpjdHpudnBqcHRtOGQifQ","tier","pro","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_41":42,"_32":43,"_36":226,"_45":-5,"_46":26,"_47":48,"_49":48,"_50":-5,"_51":-5,"_18":52,"_53":-5,"_54":26,"_55":-5,"_56":-5,"_57":58,"_59":60,"_61":62,"_63":64,"_65":227,"_67":-5,"_68":69,"_70":69,"_71":72,"_73":72,"_74":72,"_75":69,"_76":69,"_77":228,"_79":229,"_81":230,"_83":26},"tree",[197,198,199,200,201,202,203],"files",[197,198,199,200,201,202,203],"counts",{"_186":58,"_187":183,"_188":58,"_189":190,"_191":192},"contents",[125,126,127,128,129,130,131],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},{"_41":178,"_32":179,"_30":180,"_133":-5,"_39":40,"_38":181,"_134":26,"_36":182,"_13":183,"_33":20,"_34":184,"_23":26,"_136":-5,"_27":185},{"_41":171,"_32":172,"_30":173,"_133":-5,"_39":40,"_38":174,"_134":26,"_36":175,"_13":58,"_33":20,"_34":176,"_23":26,"_136":-5,"_27":177},{"_41":163,"_32":164,"_30":165,"_133":-5,"_39":40,"_38":166,"_134":26,"_36":167,"_13":58,"_33":168,"_34":169,"_23":26,"_136":-5,"_27":170},{"_41":156,"_32":157,"_30":158,"_133":-5,"_39":40,"_38":159,"_134":26,"_36":160,"_13":58,"_33":20,"_34":161,"_23":26,"_136":-5,"_27":162},{"_41":146,"_32":147,"_30":148,"_133":-5,"_39":40,"_38":149,"_134":26,"_36":150,"_13":151,"_33":152,"_34":153,"_23":26,"_136":154,"_27":155},{"_41":138,"_32":139,"_30":140,"_133":-5,"_39":40,"_38":141,"_134":26,"_36":142,"_13":58,"_33":143,"_34":144,"_23":26,"_136":-5,"_27":145},{"_41":132,"_32":28,"_30":31,"_133":-5,"_39":40,"_38":14,"_134":26,"_36":135,"_13":58,"_33":20,"_34":35,"_23":26,"_136":-5,"_27":137},"3c84e2e0-0bd7-11f1-ab86-42dde27851f2","parentId","latest",["D",1771315448635],"label",[28],"ea62b24c-0bab-11f1-9901-42dde27851f2","monitor.ts","ea62b2f6-0bab-11f1-9901-42dde27851f2",4,["D",1771296842478],"interval","import { sqlite } from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\nimport webpush from \"npm:web-push@3.6.7\";\n\n// This runs every 15 minutes to check if server is down\nexport default async function() {\n console.log(\"Checking server status...\", new Date().toISOString());\n\n try {\n // Get the last heartbeat\n const result = await sqlite.execute(\n \"SELECT timestamp FROM heartbeats ORDER BY timestamp DESC LIMIT 1\"\n );\n \n const lastHeartbeat = result.rows[0]?.timestamp as number || null;\n \n if (!lastHeartbeat) {\n console.log(\"No heartbeats recorded yet\");\n return;\n }\n\n const now = Date.now();\n const timeSinceLastHeartbeat = now - lastHeartbeat;\n const oneHour = 60 * 60 * 1000;\n \n console.log(`Last heartbeat: ${Math.floor(timeSinceLastHeartbeat / 60000)} minutes ago`);\n\n // If more than 1 hour since last heartbeat, send notifications\n if (timeSinceLastHeartbeat > oneHour) {\n console.log(\"Server is DOWN! Sending notifications...\");\n \n // Get all subscriptions\n const subscriptions = await sqlite.execute(\"SELECT * FROM subscriptions\");\n \n if (subscriptions.rows.length === 0) {\n console.log(\"No subscribers to notify\");\n return;\n }\n\n // Configure web-push with VAPID keys\n const vapidPublicKey = Deno.env.get(\"VAPID_PUBLIC_KEY\");\n const vapidPrivateKey = Deno.env.get(\"VAPID_PRIVATE_KEY\");\n const vapidEmail = Deno.env.get(\"VAPID_EMAIL\") || \"mailto:admin@example.com\";\n\n if (!vapidPublicKey || !vapidPrivateKey) {\n console.error(\"VAPID keys not configured! Please set VAPID_PUBLIC_KEY and VAPID_PRIVATE_KEY environment variables.\");\n return;\n }\n\n webpush.setVapidDetails(vapidEmail, vapidPublicKey, vapidPrivateKey);\n\n // Send notification to each subscriber\n const minutesSince = Math.floor(timeSinceLastHeartbeat / 60000);\n const payload = JSON.stringify({\n title: \"🔴 Home Server Down\",\n body: `Your server hasn't responded in ${minutesSince} minutes`,\n icon: \"/icon.png\",\n badge: \"/badge.png\",\n timestamp: now,\n });\n\n for (const sub of subscriptions.rows) {\n try {\n await webpush.sendNotification(\n {\n endpoint: sub.endpoint as string,\n keys: {\n p256dh: sub.p256dh as string,\n auth: sub.auth as string,\n },\n },\n payload\n );\n console.log(`✓ Notification sent to ${sub.endpoint}`);\n } catch (error) {\n console.error(`Failed to send notification to ${sub.endpoint}:`, error.message);\n \n // If subscription is no longer valid, remove it\n if (error.statusCode === 410) {\n await sqlite.execute({\n sql: \"DELETE FROM subscriptions WHERE endpoint = ?\",\n args: [sub.endpoint],\n });\n console.log(`Removed invalid subscription: ${sub.endpoint}`);\n }\n }\n }\n } else {\n console.log(\"Server is online ✓\");\n }\n } catch (error) {\n console.error(\"Monitor error:\", error);\n }\n}",[139],"5897b788-0bd6-11f1-b5c6-42dde27851f2","main.ts","c6cc02dc-0ba8-11f1-bece-42dde27851f2",16,["D",1771315066230],10,"http","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React from \"https://esm.sh/react@18.2.0\";\nimport { renderToString } from \"https://esm.sh/react-dom@18.2.0/server\";\nimport { Hono } from \"npm:hono@4\";\nimport { cors } from \"npm:hono@4/cors\";\nimport { sqlite } from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\n\n// Initialize Hono app\nconst app = new Hono();\n\n// Add CORS middleware\napp.use(\"/*\", cors({\n origin: \"*\",\n allowMethods: [\"GET\", \"POST\", \"OPTIONS\"],\n allowHeaders: [\"Content-Type\"],\n}));\n\n// Initialize database\nasync function initDB() {\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS heartbeats (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n timestamp INTEGER NOT NULL\n )\n `);\n \n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS subscriptions (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n endpoint TEXT UNIQUE NOT NULL,\n p256dh TEXT NOT NULL,\n auth TEXT NOT NULL,\n created_at INTEGER NOT NULL\n )\n `);\n}\n\n// Initialize DB on startup\nawait initDB();\n\n// UI Component\nfunction UI() {\n return (\n \n \n \n \n Home Server Monitor\n \n \n \n \n \n \n \n

🖥️ Home Server Monitor

Real-time server status tracking

\n \n

\n ⏳\n

Checking...

Loading status...

\n \n \n \n

\n How it works:
\n • Your server pings this app every 15 minutes
\n • If no ping received for 1+ hour, you'll get notified
\n • Subscribe to get push notifications when server is down\n

\n\n

\n Server Heartbeat Endpoint:
\n POST /heartbeat\n

\n \n

\n\n \n \n \n );\n}\n\n// Service Worker content\nconst serviceWorkerContent = `\nself.addEventListener('push', function(event) {\n console.log('Push notification received:', event);\n \n let data = { title: 'Server Status', body: 'Notification received' };\n \n if (event.data) {\n try {\n data = event.data.json();\n } catch (e) {\n data.body = event.data.text();\n }\n }\n \n const options = {\n body: data.body,\n icon: data.icon || '/icon-192.png',\n badge: data.badge || '/badge-96.png',\n vibrate: [200, 100, 200],\n timestamp: data.timestamp || Date.now(),\n requireInteraction: true,\n actions: [\n { action: 'view', title: 'View Status' },\n { action: 'close', title: 'Close' }\n ]\n };\n \n event.waitUntil(\n self.registration.showNotification(data.title, options)\n );\n});\n\nself.addEventListener('notificationclick', function(event) {\n console.log('Notification clicked:', event.action);\n \n event.notification.close();\n \n if (event.action === 'view' || !event.action) {\n event.waitUntil(\n clients.openWindow('/')\n );\n }\n});\n\nself.addEventListener('install', function(event) {\n console.log('Service Worker installing...');\n self.skipWaiting();\n});\n\nself.addEventListener('activate', function(event) {\n console.log('Service Worker activating...');\n event.waitUntil(clients.claim());\n});\n`;\n\n// PWA Manifest\nconst manifest = {\n name: \"Home Server Monitor\",\n short_name: \"Server Mon\",\n description: \"Monitor your home server status with real-time notifications\",\n start_url: \"/\",\n display: \"standalone\",\n background_color: \"#1a1a1a\",\n theme_color: \"#1a1a1a\",\n orientation: \"portrait\",\n icons: [\n {\n src: \"https://em-content.zobj.net/thumbs/240/apple/354/desktop-computer_1f5a5-fe0f.png\",\n sizes: \"240x240\",\n type: \"image/png\",\n purpose: \"any maskable\"\n }\n ]\n};\n\n// Routes\n\n// Home page\napp.get(\"/\", (c) => {\n const html = \"\" + renderToString();\n return c.html(html);\n});\n\n// Client JavaScript\napp.get(\"/client.js\", async (c) => {\n const clientJs = await Deno.readTextFile(\"./client.js\");\n return c.text(clientJs, {\n headers: {\n \"Content-Type\": \"application/javascript\",\n \"Cache-Control\": \"public, max-age=3600\",\n },\n });\n});\n\n// Service Worker\napp.get(\"/sw.js\", (c) => {\n return c.text(serviceWorkerContent, {\n headers: {\n \"Content-Type\": \"application/javascript\",\n \"Cache-Control\": \"no-cache\",\n },\n });\n});\n\n// PWA Manifest\napp.get(\"/manifest.json\", (c) => {\n return c.json(manifest, {\n headers: {\n \"Cache-Control\": \"public, max-age=3600\"\n }\n });\n});\n\n// Heartbeat endpoint - your server calls this\napp.post(\"/heartbeat\", async (c) => {\n await sqlite.execute({\n sql: \"INSERT INTO heartbeats (timestamp) VALUES (?)\",\n args: [Date.now()],\n });\n \n return c.json({ success: true, timestamp: Date.now() });\n});\n\n// Get last heartbeat status\napp.get(\"/status\", async (c) => {\n const result = await sqlite.execute(\n \"SELECT timestamp FROM heartbeats ORDER BY timestamp DESC LIMIT 1\"\n );\n \n const lastHeartbeat = result.rows[0]?.timestamp as number || null;\n const now = Date.now();\n const isOnline = lastHeartbeat ? (now - lastHeartbeat) < 60 * 60 * 1000 : false;\n const minutesSince = lastHeartbeat ? Math.floor((now - lastHeartbeat) / 60000) : null;\n \n return c.json({ \n lastHeartbeat,\n isOnline,\n minutesSince,\n currentTime: now\n });\n});\n\n// Subscribe to notifications\napp.post(\"/subscribe\", async (c) => {\n const subscription = await c.req.json();\n \n await sqlite.execute({\n sql: `INSERT OR REPLACE INTO subscriptions (endpoint, p256dh, auth, created_at) \n VALUES (?, ?, ?, ?)`,\n args: [\n subscription.endpoint,\n subscription.keys.p256dh,\n subscription.keys.auth,\n Date.now(),\n ],\n });\n \n return c.json({ success: true });\n});\n\n// Get VAPID public key for push notifications\napp.get(\"/vapid-public-key\", (c) => {\n const publicKey = Deno.env.get(\"VAPID_PUBLIC_KEY\") || \"\";\n return c.json({ publicKey });\n});\n\n// 404 handler\napp.notFound((c) => {\n return c.text(\"Not Found\", 404);\n});\n\n// Error handler\napp.onError((err, c) => {\n console.error(\"Error:\", err);\n return c.json({ error: err.message }, 500);\n});\n\n// Export as default HTTP handler\nexport default app.fetch;\n","halffullheartbeat",[147],"379462e2-0bd7-11f1-9d1f-42dde27851f2","index.html","3794640e-0bd7-11f1-9d1f-42dde27851f2",17,["D",1771315440335],"\n\n\n \n \n Home Server Monitor\n \n \n \n \n \n\n\n

🖥️ Home Server Monitor

Real-time server status tracking

\n \n

\n ⏳\n

Checking...

Loading status...

\n \n \n \n

\n How it works:
\n • Your server pings this app every 15 minutes
\n • If no ping received for 1+ hour, you'll get notified
\n • Subscribe to get push notifications when server is down\n

\n\n

\n Server Heartbeat Endpoint:
\n POST /heartbeat\n

\n \n

\n\n \n\n\n",[157],"f54a9d64-0bab-11f1-b64e-42dde27851f2","generate-vapid-keys.ts","f54a9e36-0bab-11f1-b64e-42dde27851f2",5,["D",1771296860775],"script","import webpush from \"npm:web-push@3.6.7\";\n\n// Run this once to generate VAPID keys for push notifications\nexport default async function() {\n const vapidKeys = webpush.generateVAPIDKeys();\n \n console.log(\"\\n🔑 VAPID Keys Generated!\\n\");\n console.log(\"Add these as environment variables to your val:\\n\");\n console.log(\"VAPID_PUBLIC_KEY:\");\n console.log(vapidKeys.publicKey);\n console.log(\"\\nVAPID_PRIVATE_KEY:\");\n console.log(vapidKeys.privateKey);\n console.log(\"\\nVAPID_EMAIL (optional):\");\n console.log(\"mailto:your-email@example.com\");\n console.log(\"\\n\");\n \n return {\n publicKey: vapidKeys.publicKey,\n privateKey: vapidKeys.privateKey,\n instructions: \"Add these to your val's environment variables\"\n };\n}",[164],"4c4f356e-0bd6-11f1-b6e8-42dde27851f2","client.js","4c4f3668-0bd6-11f1-b6e8-42dde27851f2",14,["D",1771315045625],"const API_BASE = window.location.origin;\nlet swRegistration = null;\n\n// Check if notifications are supported\nfunction notificationsSupported() {\n return 'Notification' in window && 'serviceWorker' in navigator && 'PushManager' in window;\n}\n\n// Convert VAPID key\nfunction urlBase64ToUint8Array(base64String) {\n const padding = '='.repeat((4 - base64String.length % 4) % 4);\n const base64 = (base64String + padding).replace(/\\-/g, '+').replace(/_/g, '/');\n const rawData = window.atob(base64);\n const outputArray = new Uint8Array(rawData.length);\n for (let i = 0; i < rawData.length; ++i) {\n outputArray[i] = rawData.charCodeAt(i);\n }\n return outputArray;\n}\n\n// Fetch server status\nasync function fetchStatus() {\n try {\n const response = await fetch(API_BASE + '/status');\n const data = await response.json();\n \n const indicator = document.getElementById('statusIndicator');\n const statusText = document.getElementById('statusText');\n const statusDetail = document.getElementById('statusDetail');\n \n if (data.isOnline) {\n indicator.className = 'status-indicator online';\n indicator.textContent = '✓';\n statusText.textContent = 'Server Online';\n statusDetail.textContent = `Last heartbeat: ${data.minutesSince} minutes ago`;\n } else {\n indicator.className = 'status-indicator offline';\n indicator.textContent = '✗';\n statusText.textContent = 'Server Offline';\n statusDetail.textContent = data.minutesSince \n ? `Last seen: ${data.minutesSince} minutes ago`\n : 'No heartbeats recorded';\n }\n } catch (error) {\n console.error('Failed to fetch status:', error);\n }\n}\n\n// Subscribe to notifications\nasync function subscribe() {\n if (!notificationsSupported()) {\n showError('Push notifications are not supported in this browser');\n return;\n }\n\n try {\n // Request notification permission\n const permission = await Notification.requestPermission();\n if (permission !== 'granted') {\n showError('Notification permission denied');\n return;\n }\n\n // Get VAPID public key\n const keyResponse = await fetch(API_BASE + '/vapid-public-key');\n const { publicKey } = await keyResponse.json();\n \n if (!publicKey) {\n showError('VAPID key not configured on server. Please add VAPID_PUBLIC_KEY and VAPID_PRIVATE_KEY environment variables.');\n return;\n }\n\n // Subscribe to push notifications\n const subscription = await swRegistration.pushManager.subscribe({\n userVisibleOnly: true,\n applicationServerKey: urlBase64ToUint8Array(publicKey)\n });\n\n // Send subscription to server\n const response = await fetch(API_BASE + '/subscribe', {\n method: 'POST',\n headers: { 'Content-Type': 'application/json' },\n body: JSON.stringify(subscription)\n });\n\n if (response.ok) {\n updateSubscribeButton(true);\n showError('✓ Notifications enabled successfully!', 'success');\n }\n } catch (error) {\n console.error('Subscription failed:', error);\n showError('Failed to enable notifications: ' + error.message);\n }\n}\n\nfunction updateSubscribeButton(subscribed) {\n const btn = document.getElementById('subscribeBtn');\n if (subscribed) {\n btn.textContent = '✓ Notifications Enabled';\n btn.className = 'btn-success';\n btn.disabled = true;\n } else {\n btn.textContent = '🔔 Enable Notifications';\n btn.className = 'btn-primary';\n btn.disabled = false;\n }\n}\n\nfunction showError(message, type = 'error') {\n const errorBox = document.getElementById('errorBox');\n errorBox.innerHTML = `

${message}

`;\n if (type === 'success') {\n setTimeout(() => errorBox.innerHTML = '', 5000);\n }\n}\n\n// Initialize\nasync function init() {\n // Update endpoint URL\n document.getElementById('endpointUrl').textContent = 'POST ' + API_BASE + '/heartbeat';\n \n // Fetch initial status\n await fetchStatus();\n \n // Refresh status every 30 seconds\n setInterval(fetchStatus, 30000);\n\n // Register service worker\n if ('serviceWorker' in navigator) {\n try {\n swRegistration = await navigator.serviceWorker.register('/sw.js');\n console.log('Service Worker registered');\n\n // Check if already subscribed\n const subscription = await swRegistration.pushManager.getSubscription();\n updateSubscribeButton(!!subscription);\n \n document.getElementById('subscribeBtn').disabled = false;\n document.getElementById('subscribeBtn').addEventListener('click', subscribe);\n } catch (error) {\n console.error('Service Worker registration failed:', error);\n }\n }\n}\n\ninit();\n",[172],"cf6baede-0bd4-11f1-879d-42dde27851f2","README.md","0a4ff5c4-0bac-11f1-9901-42dde27851f2",7,["D",1771314406597],1,"# 🖥️ Home Server Monitor\n\nA serverless monitoring solution for your home server with real-time push notifications.\n\n## 🌐 Your App URLs\n\n- **Web UI**: \n- **Heartbeat Endpoint**: `POST https://halffullheartbeat.val.run/heartbeat`\n\n## 🚀 Quick Setup\n\n### Step 1: Generate VAPID Keys for Push Notifications\n\n1. Go to \n2. Click \"Run\" to generate your VAPID keys\n3. Copy the keys from the output\n\n### Step 2: Add Environment Variables\n\n1. Go to your val settings: \n2. Click \"Environment Variables\"\n3. Add these three variables:\n - `VAPID_PUBLIC_KEY` - from step 1\n - `VAPID_PRIVATE_KEY` - from step 1\n - `VAPID_EMAIL` - your email (e.g., `mailto:you@example.com`)\n\n### Step 3: Configure Your Home Server\n\nAdd a cron job or scheduled task on your home server to ping the heartbeat endpoint every 15 minutes:\n\n**Linux/Mac (crontab):**\n```bash\n# Add to crontab (run: crontab -e)\n*/15 * * * * curl -X POST https://halffullheartbeat.val.run/heartbeat\n```\n\n**Windows (Task Scheduler PowerShell):**\n```powershell\n# Run every 15 minutes\n$action = New-ScheduledTaskAction -Execute 'powershell.exe' -Argument '-Command \"Invoke-WebRequest -Uri https://halffullheartbeat.val.run/heartbeat -Method POST\"'\n$trigger = New-ScheduledTaskTrigger -Once -At (Get-Date) -RepetitionInterval (New-TimeSpan -Minutes 15)\nRegister-ScheduledTask -TaskName \"ServerHeartbeat\" -Action $action -Trigger $trigger\n```\n\n**Docker (if your server runs Docker):**\n```bash\n# Run this container on your server\ndocker run -d --name heartbeat --restart unless-stopped \\\n alpine/curl:latest sh -c \\\n \"while true; do curl -X POST https://halffullheartbeat.val.run/heartbeat; sleep 900; done\"\n```\n\n**Simple Bash Script:**\n```bash\n#!/bin/bash\n# Save as heartbeat.sh and run: ./heartbeat.sh &\n\nwhile true; do\n curl -X POST https://halffullheartbeat.val.run/heartbeat\n sleep 900 # 15 minutes\ndone\n```\n\n### Step 4: Subscribe to Notifications\n\n1. Open the web UI: \n2. Click \"Enable Notifications\"\n3. Grant notification permissions when prompted\n\n## 📱 How It Works\n\n1. **Your Server**: Sends a heartbeat every 15 minutes to the `/heartbeat` endpoint\n2. **Monitor**: Checks every 15 minutes if a heartbeat was received in the last hour\n3. **Notifications**: If no heartbeat for 1+ hour, sends push notifications to all subscribers\n4. **Web UI**: Real-time status display that updates every 30 seconds\n\n## 🔧 API Endpoints\n\n### POST /heartbeat\nYour server calls this endpoint every 15 minutes.\n\n**Response:**\n```json\n{\n \"success\": true,\n \"timestamp\": 1234567890\n}\n```\n\n### GET /status\nGet current server status.\n\n**Response:**\n```json\n{\n \"lastHeartbeat\": 1234567890,\n \"isOnline\": true,\n \"minutesSince\": 5,\n \"currentTime\": 1234567890\n}\n```\n\n### POST /subscribe\nSubscribe to push notifications (called automatically by web UI).\n\n## 🛠️ Architecture\n\n- **main.ts**: HTTP endpoint with web UI (PWA)\n- **monitor.ts**: Interval function (runs every 15 minutes)\n- **SQLite Database**: Stores heartbeats and notification subscriptions\n- **Web Push**: VAPID-based push notifications\n\n## 📊 Database Schema\n\n**heartbeats table:**\n- `id` - Auto-increment primary key\n- `timestamp` - Unix timestamp in milliseconds\n\n**subscriptions table:**\n- `id` - Auto-increment primary key\n- `endpoint` - Push notification endpoint (unique)\n- `p256dh` - Public key for encryption\n- `auth` - Authentication secret\n- `created_at` - Subscription timestamp\n\n## 🎨 Features\n\n- ✅ Real-time server status monitoring\n- ✅ PWA (Progressive Web App) installable on mobile\n- ✅ Push notifications when server goes down\n- ✅ Beautiful, responsive UI\n- ✅ Automatic cleanup of invalid subscriptions\n- ✅ CORS-enabled API\n- ✅ Service Worker for offline support\n\n## 🔐 Security\n\n- Environment variables for sensitive keys\n- VAPID keys for authenticated push notifications\n- CORS headers for API access\n- Unique subscription endpoints per device\n\n## 📝 Notes\n\n- Server is considered \"down\" after 1 hour without heartbeat\n- Monitor runs every 15 minutes (configurable in monitor.ts)\n- Notifications sent to all active subscribers\n- Invalid subscriptions automatically removed\n- SQLite database scoped to this val\n\n## 🐛 Troubleshooting\n\n**No notifications?**\n- Check that VAPID environment variables are set\n- Ensure you granted notification permissions\n- Check monitor.ts logs for errors\n\n**Server showing offline?**\n- Verify your server's cron job is running\n- Check that the heartbeat endpoint is reachable\n- Look at the heartbeat timestamps in the database\n\n**Test the heartbeat:**\n```bash\ncurl -X POST https://halffullheartbeat.val.run/heartbeat\n```\n\n## 📞 Support\n\nFor issues or questions, check the Val Town documentation: \n",[179],"pulls","branches","forks","envVars",{"_193":195,"_196":58},"connections",{"_193":58,"_194":58},"count","unfilledCount",2,"emptyCount",{"_41":178,"_32":179,"_30":180,"_133":-5,"_39":40,"_38":181,"_134":26,"_36":223,"_13":183,"_33":20,"_34":184,"_23":26,"_136":-5,"_205":224,"_27":225},{"_41":171,"_32":172,"_30":173,"_133":-5,"_39":40,"_38":174,"_134":26,"_36":220,"_13":58,"_33":20,"_34":176,"_23":26,"_136":-5,"_205":221,"_27":222},{"_41":163,"_32":164,"_30":165,"_133":-5,"_39":40,"_38":166,"_134":26,"_36":217,"_13":58,"_33":168,"_34":169,"_23":26,"_136":-5,"_205":218,"_27":219},{"_41":156,"_32":157,"_30":158,"_133":-5,"_39":40,"_38":159,"_134":26,"_36":214,"_13":58,"_33":20,"_34":161,"_23":26,"_136":-5,"_205":215,"_27":216},{"_41":146,"_32":147,"_30":148,"_133":-5,"_39":40,"_38":149,"_134":26,"_36":211,"_13":151,"_33":152,"_34":153,"_23":26,"_136":154,"_205":212,"_27":213},{"_41":138,"_32":139,"_30":140,"_133":-5,"_39":40,"_38":141,"_134":26,"_36":208,"_13":58,"_33":143,"_34":144,"_23":26,"_136":-5,"_205":209,"_27":210},{"_41":132,"_32":28,"_30":31,"_133":-5,"_39":40,"_38":14,"_134":26,"_36":204,"_13":58,"_33":20,"_34":35,"_23":26,"_136":-5,"_205":206,"_27":207},["D",1771315448635],"children",[],[28],["D",1771296842478],[],[139],["D",1771315066230],[],[147],["D",1771315440335],[],[157],["D",1771296860775],[],[164],["D",1771315045625],[],[172],["D",1771314406597],[],[179],["D",1771295494247],["D",1789519256886],{"_95":94,"_102":98},{"_95":94,"_96":-5,"_97":98,"_18":52,"_99":100,"_101":26},{"_13":84,"_32":85,"_41":40,"_86":42,"_87":-5,"_88":-5,"_89":-5,"_90":-5,"_91":-5,"_92":43,"_93":94},"ctx",{"_77":-5,"_122":264,"_265":266,"_267":268,"_269":26,"_270":26,"_271":26,"_272":24,"_273":-5,"_274":-7,"_275":-7,"_276":58,"_277":26,"_278":26,"_279":-5,"_280":26,"_281":26,"_282":26,"_283":-5},"ENV",{"_235":236,"_237":238,"_239":85,"_240":241,"_242":243,"_244":245,"_246":247,"_248":249,"_250":251,"_252":253,"_254":255,"_256":257,"_258":259,"_260":261,"_262":263},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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