add migration table

database/migrations/2025_06_26_035409_create_se_subjects_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_subjects', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('code')->unique();
+            $table->text('description')->nullable();
+            $table->integer('status')->default(1); // true = active, false = inactive
+            $table->timestamps();
+            $table->softDeletes(); // deleted_at
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_subjects');
+    }
+};

database/migrations/2025_06_26_035709_create_se_categories_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_categories', function (Blueprint $table) {
+            $table->id();
+            $table->string('content');
+            $table->string('content_vi')->nullable();
+            $table->text('description')->nullable();
+            $table->integer('status')->default(1);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_categories');
+    }
+};

database/migrations/2025_06_26_035807_create_se_skills_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_skills', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('code')->unique();
+            $table->text('description')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_skills');
+    }
+};

database/migrations/2025_06_26_035826_create_se_question_types_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_types', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->text('description')->nullable();
+            $table->string('code')->unique();
+            $table->integer('status')->default(1);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_types');
+    }
+};

database/migrations/2025_06_26_035908_create_se_media_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        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');
+            $table->string('mime_type');
+            $table->unsignedBigInteger('size_bytes');
+            $table->integer('position')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_media');
+    }
+};

database/migrations/2025_06_26_035927_create_se_exercises_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        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->unsignedBigInteger('category_id');
+            $table->unsignedBigInteger('skill_id');
+            $table->integer('year')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_exercises');
+    }
+};

database/migrations/2025_06_26_040018_create_se_question_groups_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_groups', function (Blueprint $table) {
+            $table->id();
+            $table->text('content');
+            $table->text('content_vi')->nullable();
+            $table->unsignedBigInteger('exercise_id');
+
+            $table->integer('is_question_order_fixed')->default(0);
+            $table->integer('is_option_order_fixed')->default(0);
+            $table->integer('position')->default(0);
+            $table->text('paragraph')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_groups');
+    }
+};

database/migrations/2025_06_26_040033_create_se_questions_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        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();
+            $table->unsignedBigInteger('group_id')->nullable();
+            $table->unsignedBigInteger('question_type_id');
+            $table->integer('level')->default(0);
+            $table->integer('score')->default(1);
+            $table->text('answer')->nullable();
+            $table->text('explanation')->nullable();
+            $table->text('hint')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_questions');
+    }
+};

database/migrations/2025_06_26_040054_create_se_exercise_questions_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_exercise_questions', function (Blueprint $table) {
+            $table->id();
+
+            $table->unsignedBigInteger('exercise_id');
+            $table->unsignedBigInteger('question_id');
+            $table->integer('position')->default(0);
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_exercise_questions');
+    }
+};

database/migrations/2025_06_26_040122_create_se_question_choices_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_choices', function (Blueprint $table) {
+            $table->id();
+
+            // Chỉ giữ cột, không còn ràng buộc FK
+            $table->unsignedBigInteger('question_id');
+            $table->string('label')->nullable();
+            $table->text('content')->nullable();
+            $table->integer('is_correct')->default(0); // 0 = false, 1 = true
+            $table->json('media')->nullable();
+            $table->unsignedBigInteger('media_object_id')->nullable();
+            $table->integer('position')->default(0);
+
+            $table->timestamps();
+            $table->softDeletes();
+
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_choices');
+    }
+};

database/migrations/2025_06_26_040136_create_se_question_blanks_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::create('se_question_blanks', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('question_id');
+            $table->integer('position')->default(0);
+            $table->text('correct_answer');
+            $table->json('other_answers')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('se_question_blanks');
+    }
+};