feat: add PostHog analytics — track pageviews, queries, repo selections, diagram views

ui/package-lock.json

@@ -11,6 +11,7 @@
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+        "core-js": "^3.38.1",
+        "dompurify": "^3.3.2",
+        "fflate": "^0.4.8",
+        "preact": "^10.28.2",
+        "query-selector-shadow-dom": "^1.0.1",
+        "web-vitals": "^5.1.0"
+      }
+    },
+    "node_modules/preact": {
+      "version": "10.29.1",
+      "resolved": "https://registry.npmjs.org/preact/-/preact-10.29.1.tgz",
+      "integrity": "sha512-gQCLc/vWroE8lIpleXtdJhTFDogTdZG9AjMUpVkDf2iTCNwYNWA+u16dL41TqUDJO4gm2IgrcMv3uTpjd4Pwmg==",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/preact"
+      }
+    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -4692,6 +5044,29 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/protobufjs": {
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.5.4.tgz",
+      "integrity": "sha512-CvexbZtbov6jW2eXAvLukXjXUW1TzFaivC46BpWc/3BpcCysb5Vffu+B3XHMm8lVEuy2Mm4XGex8hBSg1yapPg==",
+      "hasInstallScript": true,
+      "dependencies": {
+        "@protobufjs/aspromise": "^1.1.2",
+        "@protobufjs/base64": "^1.1.2",
+        "@protobufjs/codegen": "^2.0.4",
+        "@protobufjs/eventemitter": "^1.1.0",
+        "@protobufjs/fetch": "^1.1.0",
+        "@protobufjs/float": "^1.0.2",
+        "@protobufjs/inquire": "^1.1.0",
+        "@protobufjs/path": "^1.1.2",
+        "@protobufjs/pool": "^1.1.0",
+        "@protobufjs/utf8": "^1.1.0",
+        "@types/node": ">=13.7.0",
+        "long": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/punycode": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
@@ -4701,6 +5076,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/query-selector-shadow-dom": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/query-selector-shadow-dom/-/query-selector-shadow-dom-1.0.1.tgz",
+      "integrity": "sha512-lT5yCqEBgfoMYpf3F2xQRK7zEr1rhIIZuceDK6+xRkJQ4NMbHTwXqk4NkwDwQMNqXgG9r9fyHnzwNVs6zV5KRw=="
+    },
     "node_modules/react": {
       "version": "19.2.4",
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.4.tgz",
@@ -5125,6 +5505,11 @@
       "resolved": "https://registry.npmjs.org/ufo/-/ufo-1.6.3.tgz",
       "integrity": "sha512-yDJTmhydvl5lJzBmy/hyOAA0d+aqCBuwl818haVdYCRrWV84o7YyeVm4QlVHStqNrrJSTb6jKuFAVqAFsr+K3Q=="
     },
+    "node_modules/undici-types": {
+      "version": "7.18.2",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
+      "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w=="
+    },
     "node_modules/unified": {
       "version": "11.0.5",
       "resolved": "https://registry.npmjs.org/unified/-/unified-11.0.5.tgz",
@@ -5433,6 +5818,11 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/web-vitals": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/web-vitals/-/web-vitals-5.2.0.tgz",
+      "integrity": "sha512-i2z98bEmaCqSDiHEDu+gHl/dmR4Q+TxFmG3/13KkMO+o8UxQzCqWaDRCiLgEa41nlO4VpXSI0ASa1xWmO9sBlA=="
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",

ui/package.json

@@ -13,6 +13,7 @@
     "@vercel/analytics": "^2.0.1",
     "d3": "^7.9.0",
     "mermaid": "^11.13.0",
+    "posthog-js": "^1.366.0",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-markdown": "^10.1.0",

ui/src/App.jsx

@@ -1,4 +1,5 @@
 import { useState, useEffect, useRef, useCallback } from "react";
+import posthog from "posthog-js";
 import Sidebar from "./components/Sidebar";
 import Message from "./components/Message";
 import DiagramView from "./components/DiagramView";
@@ -325,6 +326,9 @@ export default function App() {
       .slice(-10)
       .map(m => ({ role: m.role, content: m.content }));
 
+    // Track query event
+    posthog.capture("query_submitted", { repo: activeRepo, mode: agentMode ? "agent" : "rag" });
+
     // Add user message + placeholder assistant message.
     // On auto-retry (retryQuestion set), skip the user message — it's already in the chat
     // from the first attempt. Adding it again causes duplicate question bubbles.
@@ -610,7 +614,7 @@ export default function App() {
         repos={repos}
         reposLoading={reposLoading}
         activeRepo={activeRepo}
-        onSelectRepo={setActiveRepo}
+        onSelectRepo={(repo) => { setActiveRepo(repo); posthog.capture("repo_selected", { repo }); }}
         onReposChange={loadRepos}
         mode={mode}
         onModeChange={setMode}
@@ -671,7 +675,7 @@ export default function App() {
                 >Chat</button>
                 <button
                   className={`view-btn ${view === "graph" ? "active" : ""}`}
-                  onClick={() => setView("graph")}
+                  onClick={() => { setView("graph"); posthog.capture("diagram_view_opened", { repo: activeRepo }); }}
                 >Diagram <span style={{ fontSize: 8, verticalAlign: "middle", color: "var(--accent-soft)", marginLeft: 2 }}>●</span></button>
               </div>
             )}

ui/src/main.jsx

@@ -1,9 +1,16 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import { Analytics } from '@vercel/analytics/react'
+import posthog from 'posthog-js'
 import './index.css'
 import App from './App.jsx'
 
+posthog.init('phc_B4VarKaWfNc3u7vMcsUPRDbNgSyVxaBqtYT3ZwP6FshM', {
+  api_host: 'https://us.i.posthog.com',
+  capture_pageview: true,
+  capture_pageleave: true,
+})
+
 createRoot(document.getElementById('root')).render(
   <StrictMode>
     <App />