diff --git a/backend/fix-index-fields.js b/backend/fix-index-fields.js
new file mode 100644
index 0000000..dceb87c
--- /dev/null
+++ b/backend/fix-index-fields.js
@@ -0,0 +1,113 @@
+#!/usr/bin/env node
+
+/**
+ * Script zur automatischen Korrektur aller Index-Felder
+ * Konvertiert camelCase zu snake_case für underscored: true Models
+ */
+
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// Funktion zur Konvertierung von camelCase zu snake_case
+function camelToSnakeCase(str) {
+    return str.replace(/[A-Z]/g, letter => `_${letter.toLowerCase()}`);
+}
+
+// Funktion zur Korrektur einer Model-Datei
+function fixModelFile(filePath) {
+    try {
+        let content = fs.readFileSync(filePath, 'utf8');
+        let modified = false;
+        
+        // Suche nach Index-Definitionen
+        const indexRegex = /indexes:\s*\[([\s\S]*?)\]/g;
+        let match;
+        
+        while ((match = indexRegex.exec(content)) !== null) {
+            const indexesSection = match[1];
+            
+            // Suche nach fields-Arrays
+            const fieldsRegex = /fields:\s*\[([^\]]+)\]/g;
+            let fieldsMatch;
+            
+            while ((fieldsMatch = fieldsRegex.exec(indexesSection)) !== null) {
+                const fieldsString = fieldsMatch[1];
+                const fields = fieldsString.split(',').map(f => f.trim().replace(/['"]/g, ''));
+                
+                // Konvertiere jedes Feld von camelCase zu snake_case
+                const correctedFields = fields.map(field => {
+                    if (field.includes('_')) {
+                        return field; // Bereits snake_case
+                    }
+                    const corrected = camelToSnakeCase(field);
+                    if (corrected !== field) {
+                        console.log(`  🔄 ${field} → ${corrected}`);
+                        modified = true;
+                    }
+                    return corrected;
+                });
+                
+                // Ersetze die fields-Array
+                const oldFieldsString = `fields: [${fields.map(f => `'${f}'`).join(', ')}]`;
+                const newFieldsString = `fields: [${correctedFields.map(f => `'${f}'`).join(', ')}]`;
+                
+                content = content.replace(oldFieldsString, newFieldsString);
+            }
+        }
+        
+        if (modified) {
+            fs.writeFileSync(filePath, content, 'utf8');
+            console.log(`✅ ${filePath} korrigiert`);
+        }
+        
+        return modified;
+    } catch (error) {
+        console.error(`❌ Fehler bei ${filePath}:`, error.message);
+        return false;
+    }
+}
+
+// Hauptfunktion
+async function main() {
+    console.log('🔧 Starte automatische Korrektur aller Index-Felder...');
+    
+    const modelsDir = path.join(__dirname, 'models');
+    let totalFiles = 0;
+    let modifiedFiles = 0;
+    
+    // Rekursiv alle .js-Dateien im models-Verzeichnis durchsuchen
+    function processDirectory(dir) {
+        const items = fs.readdirSync(dir);
+        
+        for (const item of items) {
+            const fullPath = path.join(dir, item);
+            const stat = fs.statSync(fullPath);
+            
+            if (stat.isDirectory()) {
+                processDirectory(fullPath);
+            } else if (item.endsWith('.js')) {
+                totalFiles++;
+                if (fixModelFile(fullPath)) {
+                    modifiedFiles++;
+                }
+            }
+        }
+    }
+    
+    processDirectory(modelsDir);
+    
+    console.log('\n🎉 Korrektur abgeschlossen!');
+    console.log(`📊 Gesamt: ${totalFiles} Dateien geprüft`);
+    console.log(`✅ Geändert: ${modifiedFiles} Dateien`);
+    
+    if (modifiedFiles > 0) {
+        console.log('\n💡 Führen Sie jetzt das Deployment erneut aus:');
+        console.log('   sudo ./deploy-backend.sh');
+    }
+}
+
+main().catch(console.error);
diff --git a/backend/models/chat/room.js b/backend/models/chat/room.js
index 8409b9a..c79e44d 100644
--- a/backend/models/chat/room.js
+++ b/backend/models/chat/room.js
@@ -49,7 +49,7 @@ const Room = sequelize.define('Room', {
     indexes: [
         {
             name: 'idx_chat_room_owner',
-            fields: ['ownerId']},
+            fields: ['owner_id']},
     ]});
 
 export default Room;
diff --git a/backend/models/falukant/data/branch.js b/backend/models/falukant/data/branch.js
index d589e58..f4c199f 100644
--- a/backend/models/falukant/data/branch.js
+++ b/backend/models/falukant/data/branch.js
@@ -22,7 +22,7 @@ Branch.init({
     indexes: [
         {
             unique: true,
-            fields: ['regionId', 'falukantUserId']
+            fields: ['region_id', 'falukant_user_id']
         }
     ]});
 
diff --git a/backend/models/falukant/type/product.js b/backend/models/falukant/type/product.js
index 33f4eeb..6ba2f1b 100644
--- a/backend/models/falukant/type/product.js
+++ b/backend/models/falukant/type/product.js
@@ -26,7 +26,7 @@ ProductType.init({
     indexes: [
         {
             unique: true,
-            fields: ['labelTr']
+            fields: ['label_tr']
         }
     ]});
 
diff --git a/backend/models/match3/userLevelProgress.js b/backend/models/match3/userLevelProgress.js
index 17eb240..31e5fc8 100644
--- a/backend/models/match3/userLevelProgress.js
+++ b/backend/models/match3/userLevelProgress.js
@@ -71,7 +71,7 @@ const UserLevelProgress = sequelize.define('UserLevelProgress', {
   indexes: [
     {
       unique: true,
-      fields: ['userProgressId', 'levelId']  // WICHTIG: Bei underscored: true müssen snake_case Namen verwendet werden
+      fields: ['user_progress_id', 'level_id']  // WICHTIG: Bei underscored: true müssen snake_case Namen verwendet werden
     }
   ]
 });