fix db tables to have school year

app/Models/ExamDraftModel.php

@@ -32,7 +32,6 @@ class ExamDraftModel extends Model
     ];
 
     protected $allowedFields = [
-        'teacher_id',
         'author_id',
         'class_section_id',
         'semester',
@@ -40,20 +39,14 @@ class ExamDraftModel extends Model
         'exam_type',
         'draft_title',
         'author_comment',
-        'description',
-        'teacher_file',
-        'teacher_filename',
         'author_file',
         'author_filename',
         'status',
         'acceptance_type',
         'review_revision',
         'reviewer_id',
-        'admin_id',
         'is_legacy',
-        'reviewer_comment',
         'reviewer_comments',
-        'admin_comments',
         'reviewed_at',
         'final_file',
         'final_filename',
@@ -87,11 +80,9 @@ class ExamDraftModel extends Model
      * @var array<string, string>
      */
     protected array $casts = [
-        'teacher_id' => 'int',
         'author_id' => 'int',
         'class_section_id' => 'int',
         'reviewer_id' => '?int',
-        'admin_id' => '?int',
         'review_revision' => 'int',
         'version' => 'int',
         'previous_draft_id' => '?int',