Production readiness, SEO enhancements, and Engine V2 upgrades

server/db.js

@@ -43,6 +43,9 @@ export const query = {
 
 // Initialize schema
 export async function initDb() {
+  // Enable WAL mode for high concurrency
+  await query.run('PRAGMA journal_mode = WAL;');
+
   // Users table
   await query.run(`
     CREATE TABLE IF NOT EXISTS users (

server/index.js

@@ -1,5 +1,6 @@
 import express from 'express';
 import cors from 'cors';
+import helmet from 'helmet';
 import { WebSocketServer } from 'ws';
 import jwt from 'jsonwebtoken';
 import bcrypt from 'bcryptjs';
@@ -23,6 +24,10 @@ initDb().catch((err) => {
 });
 
 // Middleware configuration
+app.use(helmet({
+  contentSecurityPolicy: false,
+  crossOriginEmbedderPolicy: false,
+}));
 app.use(cors());
 
 // Stripe Webhook needs raw body, configure other routes to use express.json()
@@ -392,7 +397,25 @@ const wss = new WebSocketServer({ server });
 
 const rooms = new Map(); // projectRoom -> Set of ws clients
 
+// Heartbeat to prevent memory leaks from dead connections
+const interval = setInterval(() => {
+  wss.clients.forEach((ws) => {
+    if (ws.isAlive === false) return ws.terminate();
+    ws.isAlive = false;
+    ws.ping();
+  });
+}, 30000);
+
+wss.on('close', () => {
+  clearInterval(interval);
+});
+
 wss.on('connection', (ws) => {
+  ws.isAlive = true;
+  ws.on('pong', () => {
+    ws.isAlive = true;
+  });
+
   let currentRoom = null;
   let userId = null;