diff --git a/app.js b/app.js
index 30b155d..018f554 100644
--- a/app.js
+++ b/app.js
@@ -1465,7 +1465,7 @@ document.addEventListener('DOMContentLoaded', async () => {
 
             // Leitungsverläufe aus DB laden
             console.log("Lade Leitungsverläufe aus Datenbank...");
-            const ltgResp = await fetch('/api/layers/leitungsverlaeufe').catch(err => {
+            const ltgResp = await fetch(`/api/layers/leitungsverlaeufe?project=${encodeURIComponent(projId)}`).catch(err => {
                 console.error("Netzwerkfehler beim Laden der Leitungsverläufe:", err);
                 return null;
             });
diff --git a/db_patch_leitungen.js b/db_patch_leitungen.js
new file mode 100644
index 0000000..f28820a
--- /dev/null
+++ b/db_patch_leitungen.js
@@ -0,0 +1,34 @@
+require('dotenv').config({ override: true });
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD
+});
+
+async function run() {
+  const bwId = '5bb4e049-85f2-4433-b38e-6a66b81e9f06';
+
+  try {
+    console.log('Adding projekt_id to leitungsverleaufe and Freileitungen...');
+    
+    await pool.query('ALTER TABLE geodaten.leitungsverleaufe ADD COLUMN IF NOT EXISTS projekt_id character varying;');
+    await pool.query('ALTER TABLE geodaten."Freileitungen" ADD COLUMN IF NOT EXISTS projekt_id character varying;');
+
+    const res1 = await pool.query('UPDATE geodaten.leitungsverleaufe SET projekt_id = $1 WHERE projekt_id IS NULL;', [bwId]);
+    console.log(`Updated ${res1.rowCount} rows in leitungsverleaufe.`);
+
+    const res2 = await pool.query('UPDATE geodaten."Freileitungen" SET projekt_id = $1 WHERE projekt_id IS NULL;', [bwId]);
+    console.log(`Updated ${res2.rowCount} rows in Freileitungen.`);
+    
+  } catch (err) {
+    console.error('Error:', err);
+  } finally {
+    await pool.end();
+  }
+}
+
+run();
diff --git a/query_db_temp.js b/query_db_temp.js
new file mode 100644
index 0000000..2462235
--- /dev/null
+++ b/query_db_temp.js
@@ -0,0 +1,24 @@
+require('dotenv').config();
+const { Client } = require('pg');
+
+const client = new Client({
+    user: process.env.DB_USER,
+    host: process.env.DB_HOST,
+    database: process.env.DB_NAME,
+    password: process.env.DB_PASSWORD,
+    port: process.env.DB_PORT
+});
+
+client.connect().then(async () => {
+    // Show tables
+    const res = await client.query('SELECT table_name FROM information_schema.tables WHERE table_schema = $1', ['geodaten']);
+    console.log('Tables:', res.rows.map(r => r.table_name));
+
+    // Get projects
+    const projRes = await client.query('SELECT * FROM geodaten.projekte');
+    console.log('Projekte:', projRes.rows);
+
+    await client.end();
+}).catch(e => {
+    console.error(e);
+});
diff --git a/query_db_temp2.js b/query_db_temp2.js
new file mode 100644
index 0000000..ef4c3c1
--- /dev/null
+++ b/query_db_temp2.js
@@ -0,0 +1,26 @@
+require('dotenv').config({ override: true });
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD
+});
+
+async function run() {
+  try {
+    const res = await pool.query('SELECT table_name FROM information_schema.tables WHERE table_schema = $1', ['geodaten']);
+    console.log('Tables:', res.rows.map(r => r.table_name));
+
+    const projRes = await pool.query('SELECT * FROM geodaten.projekte');
+    console.log('Projekte:', projRes.rows);
+  } catch (err) {
+    console.error('Error:', err);
+  } finally {
+    await pool.end();
+  }
+}
+
+run();
diff --git a/query_db_temp3.js b/query_db_temp3.js
new file mode 100644
index 0000000..89ef587
--- /dev/null
+++ b/query_db_temp3.js
@@ -0,0 +1,23 @@
+require('dotenv').config({ override: true });
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD
+});
+
+async function run() {
+  try {
+    const res = await pool.query('SELECT * FROM geodaten.leitungsverleaufe LIMIT 5');
+    console.log('Leitungsverläufe:', res.rows);
+  } catch (err) {
+    console.error('Error:', err);
+  } finally {
+    await pool.end();
+  }
+}
+
+run();
diff --git a/query_db_temp4.js b/query_db_temp4.js
new file mode 100644
index 0000000..8b61d2c
--- /dev/null
+++ b/query_db_temp4.js
@@ -0,0 +1,27 @@
+require('dotenv').config({ override: true });
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD
+});
+
+async function run() {
+  try {
+    const res = await pool.query(`
+      SELECT column_name, data_type 
+      FROM information_schema.columns 
+      WHERE table_schema = 'geodaten' AND table_name = 'leitungsverleaufe'
+    `);
+    console.log('Columns:', res.rows);
+  } catch (err) {
+    console.error('Error:', err);
+  } finally {
+    await pool.end();
+  }
+}
+
+run();
diff --git a/query_db_temp5.js b/query_db_temp5.js
new file mode 100644
index 0000000..7969424
--- /dev/null
+++ b/query_db_temp5.js
@@ -0,0 +1,27 @@
+require('dotenv').config({ override: true });
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD
+});
+
+async function run() {
+  try {
+    const res = await pool.query(`
+      SELECT column_name, data_type 
+      FROM information_schema.columns 
+      WHERE table_schema = 'geodaten' AND table_name = 'Freileitungen'
+    `);
+    console.log('Columns Freileitungen:', res.rows);
+  } catch (err) {
+    console.error('Error:', err);
+  } finally {
+    await pool.end();
+  }
+}
+
+run();
diff --git a/server.js b/server.js
index a4ceb41..46cc6a4 100644
--- a/server.js
+++ b/server.js
@@ -683,9 +683,21 @@ app.get('/api/layers/leitungsverlaeufe', async (req, res) => {
         log('Unauthorized request to /api/layers/leitungsverlaeufe');
         return res.status(401).json({ error: 'Nicht autorisiert. Authentik-Header fehlen.' });
     }
-    log("Lade Leitungsverläufe aus Datenbank...");
+
+    const projectParam = req.query.project;
+    if (!projectParam) {
+        return res.status(400).json({ error: 'Projekt ID (project) fehlt.' });
+    }
+
+    const client = await pool.connect();
     try {
-        const result = await pool.query(
+        const projId = await resolveProjectId(client, projectParam);
+        if (!projId) {
+            return res.status(404).json({ error: 'Projekt nicht gefunden.' });
+        }
+
+        log(`Lade Leitungsverläufe aus Datenbank für Projekt: ${projId}`);
+        const result = await client.query(
             `SELECT jsonb_build_object(
                 'type',     'FeatureCollection',
                 'features', COALESCE(jsonb_agg(features.feature), '[]'::jsonb)
@@ -707,7 +719,7 @@ app.get('/api/layers/leitungsverlaeufe', async (req, res) => {
                 )
               ) AS feature
               FROM geodaten.leitungsverleaufe
-              WHERE art ILIKE '%wasserstoff%'
+              WHERE art ILIKE '%wasserstoff%' AND projekt_id = $1
 
               UNION ALL
 
@@ -722,12 +734,16 @@ app.get('/api/layers/leitungsverlaeufe', async (req, res) => {
                 )
               ) AS feature
               FROM geodaten."Freileitungen"
-            ) features`
+              WHERE projekt_id = $1
+            ) features`,
+            [projId]
         );
         res.json(result.rows[0].jsonb_build_object);
     } catch (err) {
         log(`FEHLER beim Laden der Leitungsverläufe: ${err.message}`);
         res.status(500).json({ error: err.message });
+    } finally {
+        client.release();
     }
 });