diff --git a/database/migrations/2025_06_26_035908_create_se_media_table.php b/database/migrations/2025_06_26_035908_create_se_media_table.php
index e46818b..29a17bc 100644
--- a/database/migrations/2025_06_26_035908_create_se_media_table.php
+++ b/database/migrations/2025_06_26_035908_create_se_media_table.php
@@ -9,7 +9,6 @@ return new class extends Migration {
     {
         Schema::create('se_media', function (Blueprint $table) {
             $table->id();
-            // Nếu muốn polymorphic, bạn nên thêm $table->string('object_type') để phân biệt loại object
             $table->unsignedBigInteger('object_id');
             $table->string('file_name');
             $table->string('file_url');
diff --git a/database/migrations/2025_06_26_035927_create_se_exercises_table.php b/database/migrations/2025_06_26_035927_create_se_exercises_table.php
index 2f2f41c..c632a01 100644
--- a/database/migrations/2025_06_26_035927_create_se_exercises_table.php
+++ b/database/migrations/2025_06_26_035927_create_se_exercises_table.php
@@ -10,16 +10,15 @@ return new class extends Migration {
         Schema::create('se_exercises', function (Blueprint $table) {
             $table->id();
 
-            // Chỉ giữ tên cột, không ràng buộc FK
             $table->unsignedBigInteger('subject_id');
             $table->string('lesson_name');
             $table->text('description')->nullable();
             $table->integer('level')->default(0);
             $table->string('avatar')->nullable();
-            $table->integer('status')->default(1); // true = active, false = inactive
+            $table->integer('status')->default(1); //
             $table->unsignedBigInteger('category_id');
             $table->unsignedBigInteger('skill_id');
-            $table->integer('year')->nullable();
+            $table->string('year')->nullable();
             $table->unsignedBigInteger('media_object_id')->nullable();
 
             $table->timestamps();
diff --git a/database/migrations/2025_06_26_040033_create_se_questions_table.php b/database/migrations/2025_06_26_040033_create_se_questions_table.php
index 56f010c..1df5cd7 100644
--- a/database/migrations/2025_06_26_040033_create_se_questions_table.php
+++ b/database/migrations/2025_06_26_040033_create_se_questions_table.php
@@ -9,8 +9,6 @@ return new class extends Migration {
     {
         Schema::create('se_questions', function (Blueprint $table) {
             $table->id();
-
-            // Các cột FK giờ chỉ giữ tên, không còn ràng buộc
             $table->unsignedBigInteger('exercise_id');
             $table->text('content');
             $table->text('description')->nullable();
diff --git a/database/migrations/2025_06_26_040122_create_se_question_choices_table.php b/database/migrations/2025_06_26_040122_create_se_question_choices_table.php
index 7bb6b4f..da75598 100644
--- a/database/migrations/2025_06_26_040122_create_se_question_choices_table.php
+++ b/database/migrations/2025_06_26_040122_create_se_question_choices_table.php
@@ -15,7 +15,7 @@ return new class extends Migration {
             $table->string('label')->nullable();
             $table->text('content')->nullable();
             $table->integer('is_correct')->default(0); // 0 = false, 1 = true
-            $table->json('media')->nullable();
+            // $table->json('media')->nullable();
             $table->unsignedBigInteger('media_object_id')->nullable();
             $table->integer('position')->default(0);