Fix MySQL scope ENUM to unit_exam in AiQuestionBankGeneratorService and ExamController

backend/app/Services/AiQuestionBankGeneratorService.php

@@ -63,7 +63,7 @@ class AiQuestionBankGeneratorService
 
         // Ensure Unit Exam exists in database
         $exam = Database::selectOne(
-            "SELECT id FROM exams WHERE course_id = ? AND scope = 'unit_comprehensive' AND (title LIKE ? OR title LIKE '%الوحدة الأولى%') LIMIT 1",
+            "SELECT id FROM exams WHERE course_id = ? AND (scope = 'unit_exam' OR scope = 'unit_comprehensive') AND (title LIKE ? OR title LIKE '%الوحدة الأولى%') LIMIT 1",
             [$courseId, "%{$unitTitle}%"]
         );
 
@@ -71,12 +71,12 @@ class AiQuestionBankGeneratorService
         if (!$examId) {
             $examId = (int)Database::insert(
                 "INSERT INTO exams (uuid, course_id, lesson_id, creator_type, scope, title, duration_minutes, passing_percentage, total_points, is_mandatory, is_published)
-                 VALUES (UUID(), ?, 0, 'ai_adaptive', 'unit_comprehensive', ?, 45, 70.00, 100, 1, 1)",
+                 VALUES (UUID(), ?, 0, 'ai_adaptive', 'unit_exam', ?, 45, 70.00, 100, 1, 1)",
                 [$courseId, "اختبار الفهم الشامل: {$unitTitle}"]
             );
         } else {
             Database::query(
-                "UPDATE exams SET title = ?, duration_minutes = 45, is_published = 1 WHERE id = ?",
+                "UPDATE exams SET title = ?, duration_minutes = 45, scope = 'unit_exam', is_published = 1 WHERE id = ?",
                 ["اختبار الفهم الشامل: {$unitTitle}", $examId]
             );
         }