backend: graceful shutdown in prod

src/server.ts

@@ -106,6 +106,27 @@ app.get("*", (req, res) => {
     res.sendFile("dist/frontend/index.html", { root: "." });
 });
 
-app.listen(3000, () => {
-    console.log("Server is running on port 3000");
+const port = process.env.PORT || 3000;
+const server = app.listen(port, () => {
+    console.log(`Server is running on port ${port}`);
 });
+
+// Add graceful shutdown handling
+const shutdown = async () => {
+    console.log('Received shutdown signal. Closing server...');
+    
+    server.close(() => {
+        console.log('Server closed');
+        process.exit(0);
+    });
+
+    // Force termination after some timeout (10sec)
+    setTimeout(() => {
+        console.log('Forcing server shutdown');
+        process.exit(1);
+    }, 10000);
+};
+
+// Handle various shutdown signals
+process.on('SIGTERM', shutdown);
+process.on('SIGINT', shutdown);