Refactor updateFamilyConversationExercises for improved database queries and clarity

- Replaced direct model queries with raw SQL queries for fetching the Bisaya language and associated courses, enhancing performance and readability.
- Simplified the retrieval of native language information for courses by using a single SQL query with a LEFT JOIN, reducing the number of database calls.
- Updated variable names for better clarity and consistency in the codebase.

backend/scripts/update-family-conversations-exercises.js

@@ -12,8 +12,6 @@ import { sequelize } from '../utils/sequelize.js';
 import VocabCourseLesson from '../models/community/vocab_course_lesson.js';
 import VocabGrammarExercise from '../models/community/vocab_grammar_exercise.js';
 import VocabCourse from '../models/community/vocab_course.js';
-import VocabLanguage from '../models/community/vocab_language.js';
-import VocabGrammarExerciseType from '../models/community/vocab_grammar_exercise_type.js';
 import User from '../models/community/user.js';
 import crypto from 'crypto';
 import bcrypt from 'bcryptjs';
@@ -425,31 +423,34 @@ async function updateFamilyConversationExercises() {
   console.log('✅ Datenbankverbindung erfolgreich hergestellt.\n');
 
   const systemUser = await findOrCreateSystemUser();
-  const bisayaLanguage = await VocabLanguage.findOne({ where: { name: 'Bisaya' } });
+  
+  // Finde Bisaya-Sprache mit SQL
+  const [bisayaLangResult] = await sequelize.query(
+    `SELECT id FROM community.vocab_language WHERE name = 'Bisaya' LIMIT 1`,
+    { type: sequelize.QueryTypes.SELECT }
+  );
 
-  if (!bisayaLanguage) {
+  if (!bisayaLangResult) {
     console.error('❌ Bisaya-Sprache nicht gefunden.');
     return;
   }
 
-  // Hole alle Bisaya-Kurse
-  const courses = await VocabCourse.findAll({
-    where: { languageId: bisayaLanguage.id },
-    attributes: ['id', 'title', 'nativeLanguageId']
-  });
+  const bisayaLanguageId = bisayaLangResult.id;
 
-  // Hole native language info für jeden Kurs
-  const coursesWithNativeLang = await Promise.all(
-    courses.map(async (course) => {
-      let nativeLanguage = null;
-      if (course.nativeLanguageId) {
-        nativeLanguage = await VocabLanguage.findByPk(course.nativeLanguageId);
-      }
-      return {
-        ...course.get({ plain: true }),
-        nativeLanguage: nativeLanguage ? nativeLanguage.get({ plain: true }) : null
-      };
-    })
+  // Hole alle Bisaya-Kurse mit native language info
+  const courses = await sequelize.query(
+    `SELECT 
+      c.id,
+      c.title,
+      c.native_language_id,
+      nl.name as native_language_name
+    FROM community.vocab_course c
+    LEFT JOIN community.vocab_language nl ON c.native_language_id = nl.id
+    WHERE c.language_id = :bisayaLanguageId`,
+    {
+      replacements: { bisayaLanguageId },
+      type: sequelize.QueryTypes.SELECT
+    }
   );
 
   console.log(`📚 Gefunden: ${courses.length} Bisaya-Kurse\n`);
@@ -457,11 +458,11 @@ async function updateFamilyConversationExercises() {
   let totalExercisesCreated = 0;
   let totalLessonsProcessed = 0;
 
-  for (const course of coursesWithNativeLang) {
+  for (const course of courses) {
     console.log(`📖 Kurs: ${course.title} (ID: ${course.id})`);
     
     // Finde native language name
-    const nativeLanguageName = course.nativeLanguage?.name || 'Deutsch';
+    const nativeLanguageName = course.native_language_name || 'Deutsch';
     console.log(`   Muttersprache: ${nativeLanguageName}`);
 
     // Finde "Familien-Gespräche" Lektion