fix(render): provision postgres and require DATABASE_URL in production

package.json

@@ -1,6 +1,6 @@
 {
   "name": "discord-like-app",
-  "version": "3.2.10",
+  "version": "3.2.11",
   "main": "server.js",
   "scripts": {
     "dev": "nodemon server.js",

render.yaml

@@ -1,3 +1,7 @@
+databases:
+  - name: ultimate-chat-db
+    plan: free
+
 services:
   - type: web
     name: ultimate-chat-app
@@ -9,3 +13,11 @@ services:
     envVars:
       - key: NODE_ENV
         value: production
+      - key: DATABASE_URL
+        fromDatabase:
+          name: ultimate-chat-db
+          property: connectionString
+      - key: JWT_SECRET
+        generateValue: true
+      - key: CORS_ORIGIN
+        value: "*"

server.js

@@ -108,10 +108,18 @@ app.get('/api/rtc-config', (req, res) => {
   });
 });
 
-const connectionString = process.env.DATABASE_URL || 'postgres://postgres:postgres@localhost:5432/discord-app';
-const isLocalConnection = connectionString.includes('localhost') || connectionString.includes('127.0.0.1');
+const isProduction = process.env.NODE_ENV === 'production';
+const connectionString = process.env.DATABASE_URL;
 
-const sequelize = new Sequelize(connectionString, {
+if (isProduction && !connectionString) {
+  console.error('Missing DATABASE_URL in production. Add it in Render Environment settings or via render.yaml fromDatabase binding.');
+  process.exit(1);
+}
+
+const resolvedConnectionString = connectionString || 'postgres://postgres:postgres@localhost:5432/discord-app';
+const isLocalConnection = resolvedConnectionString.includes('localhost') || resolvedConnectionString.includes('127.0.0.1');
+
+const sequelize = new Sequelize(resolvedConnectionString, {
   dialect: 'postgres',
   logging: false,
   protocol: 'postgres',