-- Add employee_id to users to map biometric device IDs
ALTER TABLE users ADD COLUMN employee_id VARCHAR(50) UNIQUE AFTER full_name;

-- Table to store raw attendance logs from biometric device
CREATE TABLE IF NOT EXISTS attendance_logs (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT,
    employee_id VARCHAR(50), -- Mapping from the device
    log_timestamp DATETIME,
    log_type ENUM('IN', 'OUT', 'OTHER') DEFAULT 'IN',
    device_id VARCHAR(100),
    ip_address VARCHAR(45),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL
);