Enhance database cleanup operations in syncDatabase.js

- Added a helper function to check for table existence before performing cleanup operations, ensuring that invalid queries are avoided.
- Updated cleanup logic for church_office and church_application tables to only execute if the respective tables exist, improving robustness and preventing errors.
- Maintained existing logging for cleanup operations to provide visibility into the process.

backend/utils/syncDatabase.js

@@ -22,6 +22,22 @@ const queryWithTimeout = async (query, timeoutMs = 30000, description = 'Query')
         throw error;
     }
 };
+
+// Helper: Prüft ob Tabelle existiert
+const tableExists = async (schema, tableName) => {
+    try {
+        const result = await sequelize.query(`
+            SELECT EXISTS (
+                SELECT FROM information_schema.tables 
+                WHERE table_schema = '${schema}' 
+                AND table_name = '${tableName}'
+            );
+        `, { type: sequelize.QueryTypes.SELECT });
+        return result[0]?.exists || false;
+    } catch (error) {
+        return false;
+    }
+};
 import initializeTypes from './initializeTypes.js';
 import initializeSettings from './initializeSettings.js';
 import initializeUserRights from './initializeUserRights.js';
@@ -741,7 +757,8 @@ const syncDatabaseForDeployment = async () => {
                 console.log(`✅ ${deletedCount8} verwaiste political_office Einträge entfernt`);
             }
             
-            // Cleanup church_office mit ungültigen character_id, office_type_id oder region_id
+            // Cleanup church_office mit ungültigen character_id, office_type_id oder region_id (nur wenn Tabelle existiert)
+            if (await tableExists('falukant_data', 'church_office')) {
                 console.log("  → Prüfe church_office...");
                 const result11 = await queryWithTimeout(`
                     DELETE FROM falukant_data.church_office
@@ -757,8 +774,10 @@ const syncDatabaseForDeployment = async () => {
                 if (deletedCount11 > 0) {
                     console.log(`✅ ${deletedCount11} verwaiste church_office Einträge entfernt`);
                 }
+            }
             
-            // Cleanup church_application mit ungültigen character_id, office_type_id, region_id oder supervisor_id
+            // Cleanup church_application mit ungültigen character_id, office_type_id, region_id oder supervisor_id (nur wenn Tabelle existiert)
+            if (await tableExists('falukant_data', 'church_application')) {
                 console.log("  → Prüfe church_application...");
                 const result12 = await queryWithTimeout(`
                     DELETE FROM falukant_data.church_application
@@ -776,6 +795,7 @@ const syncDatabaseForDeployment = async () => {
                 if (deletedCount12 > 0) {
                     console.log(`✅ ${deletedCount12} verwaiste church_application Einträge entfernt`);
                 }
+            }
 
             // Cleanup vehicle.condition: Legacy-Nulls + Range clamp (UI zeigt sonst "Unbekannt")
             console.log("  → Prüfe vehicle.condition...");