chore: migrate to node.js backend to support database saving and serve static files

app.js

@@ -1434,7 +1434,7 @@ document.addEventListener('DOMContentLoaded', async () => {
             }));
 
             try {
-                const response = await fetch('http://localhost:3000/api/wea', {
+                const response = await fetch('/api/wea', {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
                     body: JSON.stringify({ projekt_id, turbines: turbineData })

package.json

@@ -0,0 +1,15 @@
+{
+  "name": "bwsamern-ohne-planungstool",
+  "version": "1.0.0",
+  "main": "server.js",
+  "dependencies": {
+    "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.5",
+    "express": "^4.19.2",
+    "pg": "^8.11.5"
+  },
+  "scripts": {
+    "start": "node server.js"
+  }
+}

server.js

@@ -3,6 +3,7 @@ const express = require('express');
 const { Pool } = require('pg');
 const bodyParser = require('body-parser');
 const cors = require('cors');
+const path = require('path');
 
 const app = express();
 const port = process.env.PORT || 3000;
@@ -10,6 +11,9 @@ const port = process.env.PORT || 3000;
 app.use(cors());
 app.use(bodyParser.json());
 
+// Serve static files from the root directory
+app.use(express.static(path.join(__dirname, './')));
+
 const pool = new Pool({
   host: process.env.DB_HOST,
   port: process.env.DB_PORT,
@@ -20,7 +24,7 @@ const pool = new Pool({
 
 // Test DB Connection
 pool.connect()
-  .then(() => console.log('Connected to PostgreSQL (enwelo_db) successfully'))
+  .then(() => console.log('Connected to PostgreSQL successfully'))
   .catch(err => console.error('Connection error', err.stack));
 
 // API to save turbines
@@ -32,13 +36,9 @@ app.post('/api/wea', async (req, res) => {
         await client.query('BEGIN');
         
         // Delete existing turbines for this project before saving new state
-        // (This ensures we always have the latest state on 'Save')
         await client.query('DELETE FROM geodaten.wea_standorte WHERE projekt_id = $1', [projekt_id]);
         
         for(let t of turbines) {
-            // Mapping frontend data to geodaten.wea_standorte columns:
-            // wea_nummer, hersteller, anlagentyp, nabenhoehe, rotordurchmesser, ksf_drehung, projekt_id, geom
-            
             await client.query(
               `INSERT INTO geodaten.wea_standorte (
                 wea_nummer, hersteller, anlagentyp, nabenhoehe, rotordurchmesser, ksf_drehung, projekt_id, geom
@@ -85,6 +85,11 @@ app.get('/api/wea/:projekt_id', async (req, res) => {
     }
 });
 
-app.listen(port, () => {
+// Catch-all route to serve index.html for any other request (optional, good for SPAs)
-    console.log(`Backend server listening at http://localhost:${port}`);
+app.get('*', (req, res) => {
+  res.sendFile(path.join(__dirname, 'index.html'));
+});
+
+app.listen(port, '0.0.0.0', () => {
+    console.log(`Server running at http://0.0.0.0:${port}`);
 });