diff --git a/backend/models/falukant/data/user_house.js b/backend/models/falukant/data/user_house.js
index f9b9ff5..ad51590 100644
--- a/backend/models/falukant/data/user_house.js
+++ b/backend/models/falukant/data/user_house.js
@@ -26,13 +26,11 @@ UserHouse.init({
     },
     houseTypeId: {
         type: DataTypes.INTEGER,
-        allowNull: false,
-        defaultValue: 1
+        allowNull: false
     },
     userId: {
         type: DataTypes.INTEGER,
-        allowNull: false,
-        defaultValue: 1
+        allowNull: false
     }
 }, {
     sequelize,
diff --git a/backend/utils/syncDatabase.js b/backend/utils/syncDatabase.js
index 38772e4..26c7c8f 100644
--- a/backend/utils/syncDatabase.js
+++ b/backend/utils/syncDatabase.js
@@ -122,7 +122,21 @@ const syncDatabase = async () => {
                 console.log(`✅ ${deletedCount5} verwaiste promotional_gift Einträge entfernt`);
             }
 
-            if (deletedCount1 === 0 && deletedCount2 === 0 && deletedCount3 === 0 && deletedCount4 === 0 && deletedCount5 === 0) {
+            // Cleanup user_house mit ungültigen house_type_id oder user_id
+            const result6 = await sequelize.query(`
+                DELETE FROM falukant_data.user_house
+                WHERE house_type_id NOT IN (
+                    SELECT id FROM falukant_type.house
+                ) OR user_id NOT IN (
+                    SELECT id FROM falukant_data.falukant_user
+                );
+            `);
+            const deletedCount6 = result6[1] || 0;
+            if (deletedCount6 > 0) {
+                console.log(`✅ ${deletedCount6} verwaiste user_house Einträge entfernt`);
+            }
+
+            if (deletedCount1 === 0 && deletedCount2 === 0 && deletedCount3 === 0 && deletedCount4 === 0 && deletedCount5 === 0 && deletedCount6 === 0) {
                 console.log("✅ Keine verwaisten Einträge gefunden");
             }
             } catch (e) {
@@ -315,7 +329,21 @@ const syncDatabaseForDeployment = async () => {
                 console.log(`✅ ${deletedCount5} verwaiste promotional_gift Einträge entfernt`);
             }
 
-            if (deletedCount1 === 0 && deletedCount2 === 0 && deletedCount3 === 0 && deletedCount4 === 0 && deletedCount5 === 0) {
+            // Cleanup user_house mit ungültigen house_type_id oder user_id
+            const result6 = await sequelize.query(`
+                DELETE FROM falukant_data.user_house
+                WHERE house_type_id NOT IN (
+                    SELECT id FROM falukant_type.house
+                ) OR user_id NOT IN (
+                    SELECT id FROM falukant_data.falukant_user
+                );
+            `);
+            const deletedCount6 = result6[1] || 0;
+            if (deletedCount6 > 0) {
+                console.log(`✅ ${deletedCount6} verwaiste user_house Einträge entfernt`);
+            }
+
+            if (deletedCount1 === 0 && deletedCount2 === 0 && deletedCount3 === 0 && deletedCount4 === 0 && deletedCount5 === 0 && deletedCount6 === 0) {
                 console.log("✅ Keine verwaisten Einträge gefunden");
             }
         } catch (e) {