diff --git a/backend/fix-index-fields-v2.js b/backend/fix-index-fields-v2.js
new file mode 100644
index 0000000..970a2fd
--- /dev/null
+++ b/backend/fix-index-fields-v2.js
@@ -0,0 +1,149 @@
+#!/usr/bin/env node
+
+/**
+ * Script zur automatischen Korrektur aller Index-Felder - Version 2
+ * 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;
+        
+        // Prüfe ob die Datei Indexe enthält
+        const hasIndexes = content.includes('indexes:') || content.includes('fields:');
+        
+        if (hasIndexes) {
+            console.log(`\n🔍 Prüfe: ${path.basename(filePath)} (enthält Indexe)`);
+            
+            // Suche nach verschiedenen Index-Formaten
+            const patterns = [
+                // Standard-Format: fields: ['field1', 'field2']
+                {
+                    regex: /fields:\s*\[([^\]]+)\]/g,
+                    name: 'Standard fields'
+                },
+                // Mit Leerzeichen: fields: [ 'field1', 'field2' ]
+                {
+                    regex: /fields:\s*\[\s*([^\]]+)\s*\]/g,
+                    name: 'Fields mit Leerzeichen'
+                }
+            ];
+            
+            let foundIndexes = false;
+            
+            for (const pattern of patterns) {
+                let match;
+                while ((match = pattern.regex.exec(content)) !== null) {
+                    foundIndexes = true;
+                    const fieldsString = match[1];
+                    console.log(`  📍 ${pattern.name}: ${fieldsString}`);
+                    
+                    // Extrahiere Felder
+                    const fields = fieldsString.split(',').map(f => {
+                        const cleaned = f.trim().replace(/['"]/g, '');
+                        return cleaned;
+                    }).filter(f => f.length > 0);
+                    
+                    console.log(`  📋 Gefundene Felder: [${fields.join(', ')}]`);
+                    
+                    // Konvertiere Felder
+                    const correctedFields = fields.map(field => {
+                        if (field.includes('_')) {
+                            console.log(`    ✅ ${field} (bereits snake_case)`);
+                            return field;
+                        }
+                        const corrected = camelToSnakeCase(field);
+                        if (corrected !== field) {
+                            console.log(`    🔄 ${field} → ${corrected}`);
+                            modified = true;
+                        }
+                        return corrected;
+                    });
+                    
+                    // Ersetze in der Datei
+                    const oldFieldsString = `fields: [${fields.map(f => `'${f}'`).join(', ')}]`;
+                    const newFieldsString = `fields: [${correctedFields.map(f => `'${f}'`).join(', ')}]`;
+                    
+                    if (oldFieldsString !== newFieldsString) {
+                        console.log(`    📝 Ersetze: ${oldFieldsString}`);
+                        console.log(`    📝 Durch:   ${newFieldsString}`);
+                        content = content.replace(oldFieldsString, newFieldsString);
+                    }
+                }
+            }
+            
+            if (!foundIndexes) {
+                console.log(`  ⚠️  Datei enthält 'indexes:' aber keine 'fields:' Definitionen`);
+            }
+            
+            if (modified) {
+                fs.writeFileSync(filePath, content, 'utf8');
+                console.log(`  ✅ Datei korrigiert und gespeichert`);
+            } else {
+                console.log(`  ℹ️  Keine Änderungen nötig`);
+            }
+        } else {
+            console.log(`\n🔍 Prüfe: ${path.basename(filePath)} (keine Indexe)`);
+        }
+        
+        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 (Version 2)...');
+    
+    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/fix-index-fields.js b/backend/fix-index-fields.js
index dceb87c..db8aee4 100644
--- a/backend/fix-index-fields.js
+++ b/backend/fix-index-fields.js
@@ -23,20 +23,24 @@ function fixModelFile(filePath) {
         let content = fs.readFileSync(filePath, 'utf8');
         let modified = false;
         
-        // Suche nach Index-Definitionen
+        // Suche nach Index-Definitionen - verbesserte Regex
         const indexRegex = /indexes:\s*\[([\s\S]*?)\]/g;
         let match;
         
         while ((match = indexRegex.exec(content)) !== null) {
             const indexesSection = match[1];
             
-            // Suche nach fields-Arrays
+            // Suche nach fields-Arrays - verbesserte Regex
             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, ''));
+                // Verbesserte Feld-Extraktion
+                const fields = fieldsString.split(',').map(f => {
+                    const cleaned = f.trim().replace(/['"]/g, '');
+                    return cleaned;
+                }).filter(f => f.length > 0);
                 
                 // Konvertiere jedes Feld von camelCase zu snake_case
                 const correctedFields = fields.map(field => {
@@ -51,10 +55,15 @@ function fixModelFile(filePath) {
                     return corrected;
                 });
                 
-                // Ersetze die fields-Array
+                // Ersetze die fields-Array - verbesserte Ersetzung
                 const oldFieldsString = `fields: [${fields.map(f => `'${f}'`).join(', ')}]`;
                 const newFieldsString = `fields: [${correctedFields.map(f => `'${f}'`).join(', ')}]`;
                 
+                // Debug-Ausgabe
+                console.log(`  📍 Datei: ${path.basename(filePath)}`);
+                console.log(`  🔍 Gefunden: ${oldFieldsString}`);
+                console.log(`  ✅ Ersetzt: ${newFieldsString}`);
+                
                 content = content.replace(oldFieldsString, newFieldsString);
             }
         }
diff --git a/backend/models/falukant/data/vote.js b/backend/models/falukant/data/vote.js
index 13ce6af..373d600 100644
--- a/backend/models/falukant/data/vote.js
+++ b/backend/models/falukant/data/vote.js
@@ -33,7 +33,7 @@ Vote.init(
     indexes: [
       {
         unique: true,
-        fields: ['electionId', 'candidateId']},
+        fields: ['election_id', 'candidate_id']},
     ]}
 );
 
diff --git a/backend/models/falukant/log/dayproduction.js b/backend/models/falukant/log/dayproduction.js
index 1e42c1b..46ea373 100644
--- a/backend/models/falukant/log/dayproduction.js
+++ b/backend/models/falukant/log/dayproduction.js
@@ -34,7 +34,7 @@ DayProduction.init({
     indexes: [
         {
             unique: true,
-            fields: ['producerId', 'productId', 'regionId', 'productionDate']
+            fields: ['producer_id', 'product_id', 'region_id', 'production_date']
         }
     ]
 });
diff --git a/backend/models/falukant/log/daysell.js b/backend/models/falukant/log/daysell.js
index f150554..07f9c36 100644
--- a/backend/models/falukant/log/daysell.js
+++ b/backend/models/falukant/log/daysell.js
@@ -30,7 +30,7 @@ DaySell.init({
     indexes: [
         {
             unique: true,
-            fields: ['sellerId', 'productId', 'regionId']
+            fields: ['seller_id', 'product_id', 'region_id']
         }
     ]
 });
diff --git a/backend/models/falukant/type/branch.js b/backend/models/falukant/type/branch.js
index 74709a3..44820c7 100644
--- a/backend/models/falukant/type/branch.js
+++ b/backend/models/falukant/type/branch.js
@@ -20,7 +20,7 @@ BranchType.init({
     indexes: [
         {
             unique: true,
-            fields: ['labelTr']
+            fields: ['label_tr']
         }
     ]});
 
diff --git a/backend/models/falukant/type/house.js b/backend/models/falukant/type/house.js
index febdc9b..90c347d 100644
--- a/backend/models/falukant/type/house.js
+++ b/backend/models/falukant/type/house.js
@@ -25,7 +25,7 @@ HouseType.init({
     indexes: [
         {
             unique: true,
-            fields: ['labelTr']
+            fields: ['label_tr']
         }
     ]});
 
diff --git a/backend/models/falukant/type/title_requirement.js b/backend/models/falukant/type/title_requirement.js
index eb382ca..bfb3fd1 100644
--- a/backend/models/falukant/type/title_requirement.js
+++ b/backend/models/falukant/type/title_requirement.js
@@ -27,7 +27,7 @@ TitleRequirement.init({
     indexes: [
         {
             unique: true,
-            fields: ['titleId', 'requirementType'],
+            fields: ['title_id', 'requirement_type'],
             name: 'title_requirement_titleid_reqtype_unique'
         }
     ]
diff --git a/backend/models/match3/levelTileType.js b/backend/models/match3/levelTileType.js
index 014d3c2..55535b2 100644
--- a/backend/models/match3/levelTileType.js
+++ b/backend/models/match3/levelTileType.js
@@ -45,7 +45,7 @@ const Match3LevelTileType = sequelize.define('Match3LevelTileType', {
   indexes: [
     {
       unique: true,
-      fields: ['levelId', 'tileTypeId']  // WICHTIG: Bei underscored: true müssen snake_case Namen verwendet werden
+      fields: ['level_id', 'tile_type_id']  // WICHTIG: Bei underscored: true müssen snake_case Namen verwendet werden
     }
   ]
 });
diff --git a/backend/models/match3/userProgress.js b/backend/models/match3/userProgress.js
index 1f05ea2..f10d2d4 100644
--- a/backend/models/match3/userProgress.js
+++ b/backend/models/match3/userProgress.js
@@ -55,7 +55,7 @@ const UserProgress = sequelize.define('UserProgress', {
   indexes: [
     {
       unique: true,
-      fields: ['userId', 'campaignId']  // WICHTIG: Bei underscored: true müssen snake_case Namen verwendet werden
+      fields: ['user_id', 'campaign_id']  // WICHTIG: Bei underscored: true müssen snake_case Namen verwendet werden
     }
   ]
 });