CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    first_name VARCHAR(100),
    last_name VARCHAR(100),
    father_name VARCHAR(100),
    birth_date DATE,
    national_id VARCHAR(10) UNIQUE,
    gender ENUM('male', 'female'),
    phone VARCHAR(15),
    email VARCHAR(100),
    address TEXT,
    postal_code VARCHAR(10),
    referrer VARCHAR(100),
    password_hash VARCHAR(255),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
