// database/migrations/xxxx_create_coupons_table.php
public function up()
{
    Schema::create('coupons', function (Blueprint $table) {
        $table->id();
        $table->string('code')->unique();
        $table->enum('type', ['fixed', 'percent'])->default('fixed');
        $table->decimal('value', 10, 2);
        $table->decimal('min_order_amount', 10, 2)->nullable();
        $table->date('expiry_date')->nullable();
        $table->integer('usage_limit')->nullable();
        $table->integer('used_count')->default(0);
        $table->boolean('is_active')->default(true);
        $table->timestamps();
    });
}