**Đóng vai:** Bạn là chuyên gia kiến trúc phần mềm Laravel 13.5 và PostgreSQL. **Nhiệm vụ:** Xây dựng hệ thống Database Migration (8 bảng) cho dự án HQLand dựa trên thiết kế V3.

**Thực hiện chính xác các bước sau:**

**Bước 1:** Tìm trong `database/migrations/`. Xóa TẤT CẢ các file migration hiện có. (Bắt đầu từ một nền tảng sạch).

**Bước 2: Tạo file `2025_01_01_000000_create_projects_table.php`**

PHP

```
<?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('projects', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->string('name');
            $table->string('type');
            $table->string('address')->nullable();
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('projects'); }
};
```

**Bước 3: Tạo file `2025_01_02_000000_create_products_table.php`**

PHP

```
<?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('products', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->foreignUuid('project_id')->constrained('projects')->cascadeOnDelete();
            $table->string('product_type');
            $table->string('code')->unique();
            $table->decimal('area', 10, 2);
            $table->decimal('price_per_unit', 15, 2)->nullable();
            $table->decimal('total_price', 15, 2);
            $table->jsonb('custom_data')->nullable(); // Chứa thông tin tầng, view, hướng...
            $table->string('status')->default('Đang mở bán');
            $table->string('red_book_status')->default('Chưa có dữ liệu');
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('products'); }
};
```

**Bước 4: Tạo file `2025_01_03_000000_create_customers_table.php`**

PHP

```
<?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('customers', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->string('cmnd_cccd')->unique();
            $table->string('full_name');
            $table->string('phone')->nullable();
            $table->string('email')->nullable();
            $table->jsonb('address')->nullable(); // Lưu cấu trúc: số nhà, phường, quận...
            $table->date('dob')->nullable();
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('customers'); }
};
```

**Bước 5: Tạo file `2025_01_04_000000_create_contracts_table.php`**

PHP

```
<?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('contracts', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->foreignUuid('product_id')->constrained('products')->cascadeOnDelete();
            $table->integer('transfer_order')->default(0); 
            $table->string('contract_type')->default('HĐMB');
            $table->string('contract_number')->unique();
            $table->date('signing_date')->nullable();
            $table->decimal('total_value', 15, 2);
            $table->decimal('paid_amount', 15, 2)->default(0);
            // Cột ảo tự động tính số tiền còn lại, dev không cần query tính toán
            $table->decimal('remaining_amount', 15, 2)->virtualAs('total_value - paid_amount');
            $table->jsonb('metadata')->nullable();
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('contracts'); }
};
```

**Bước 6: Tạo file `2025_01_05_000000_create_contract_customers_table.php` (Bảng trung gian)**

PHP

```
<?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('contract_customers', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->foreignUuid('contract_id')->constrained('contracts')->cascadeOnDelete();
            $table->foreignUuid('customer_id')->constrained('customers')->cascadeOnDelete();
            $table->string('role')->default('CHỦ SH 1'); // Đồng sở hữu
            $table->integer('transfer_order')->default(0);
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('contract_customers'); }
};
```

**Bước 7: Tạo file `2025_01_06_000000_create_appendices_table.php` (Phụ lục)**

PHP

```
<?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('appendices', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->foreignUuid('contract_id')->constrained('contracts')->cascadeOnDelete();
            $table->foreignUuid('product_id')->constrained('products')->cascadeOnDelete();
            $table->string('type');
            $table->integer('apply_from_order')->default(0);
            $table->date('signing_date')->nullable();
            $table->jsonb('custom_data')->nullable();
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('appendices'); }
};
```

**Bước 8: Tạo file `2025_01_07_000000_create_settlements_table.php` (Quyết toán)**

PHP

```
<?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('settlements', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->foreignUuid('product_id')->constrained('products')->cascadeOnDelete();
            $table->string('type'); // "MÓNG", "THÂN", "CP THI CÔNG"
            $table->decimal('temp_value', 15, 2)->default(0);
            $table->decimal('final_value', 15, 2)->default(0);
            $table->decimal('difference', 15, 2)->virtualAs('final_value - temp_value');
            $table->string('red_book_status')->nullable();
            $table->date('issue_date')->nullable();
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('settlements'); }
};
```

**Bước 9: Tạo file `2025_01_08_000000_create_payments_table.php` (Thanh toán / Biên lai)**

PHP

```
<?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('payments', function (Blueprint $table) {
            $table->uuid('id')->primary();
            $table->foreignUuid('contract_id')->constrained('contracts')->cascadeOnDelete();
            $table->string('payment_type');
            $table->integer('installment_no')->default(1);
            $table->decimal('amount', 15, 2);
            $table->date('due_date')->nullable();
            $table->date('paid_date')->nullable();
            $table->string('status')->default('PENDING'); // PENDING, PAID, OVERDUE, CANCELLED
            $table->string('receipt_number')->nullable();
            $table->jsonb('metadata')->nullable();
            $table->timestamps();
        });
    }
    public function down(): void { Schema::dropIfExists('payments'); }
};
```