Fix: Aktualisiere SQL-Abfragen in sequelize.js für bessere Bindung

Änderung:
- SQL-Abfragen in der Datei sequelize.js wurden aktualisiert, um die Verwendung von `bind` anstelle von `replacements` zu implementieren. Dies verbessert die Lesbarkeit und Konsistenz der Abfragen.

Diese Anpassung sorgt dafür, dass die SQL-Abfragen effizienter und sicherer ausgeführt werden.

backend/utils/sequelize.js

@@ -3,8 +3,6 @@ import dotenv from 'dotenv';
 
 dotenv.config();
 
-
-
 const sequelize = new Sequelize(process.env.DB_NAME, process.env.DB_USER, process.env.DB_PASS, {
     host: process.env.DB_HOST,
     dialect: 'postgres',
@@ -135,10 +133,10 @@ const checkSchemaForUpdates = async (schemaName, models) => {
         const tables = await sequelize.query(`
             SELECT table_name 
             FROM information_schema.tables 
-            WHERE table_schema = :schemaName
+            WHERE table_schema = $1
             ORDER BY table_name
         `, { 
-            replacements: { schemaName },
+            bind: [schemaName],
             type: sequelize.QueryTypes.SELECT 
         });
         
@@ -186,11 +184,11 @@ const checkForMissingTables = async (schemaName, models) => {
                 const tableExists = await sequelize.query(`
                     SELECT EXISTS (
                         SELECT FROM information_schema.tables 
-                        WHERE table_schema = :schemaName 
-                        AND table_name = :tableName
+                        WHERE table_schema = $1 
+                        AND table_name = $2
                     );
                 `, { 
-                    replacements: { schemaName, tableName: model.tableName },
+                    bind: [schemaName, model.tableName],
                     type: sequelize.QueryTypes.SELECT 
                 });
                 
@@ -221,11 +219,11 @@ const checkTableForUpdates = async (schemaName, tableName, models) => {
         const currentColumns = await sequelize.query(`
             SELECT column_name, data_type, is_nullable, column_default
             FROM information_schema.columns 
-            WHERE table_schema = :schemaName 
-            AND table_name = :tableName
+            WHERE table_schema = $1 
+            AND table_name = $2
             ORDER BY ordinal_position
         `, { 
-            replacements: { schemaName, tableName },
+            bind: [schemaName, tableName],
             type: sequelize.QueryTypes.SELECT 
         });