-- 002_create_users_table.sql
CREATE TABLE IF NOT EXISTS users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    full_name VARCHAR(100),
    department VARCHAR(100),
    position VARCHAR(100),
    role ENUM('requester', 'approver', 'admin') NOT NULL DEFAULT 'requester',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);