CREATE TABLE IF NOT EXISTS bookings (
    id INT AUTO_INCREMENT PRIMARY KEY,
    client_id INT NOT NULL,
    coach_id INT NOT NULL,
    booking_time DATETIME NOT NULL,
    status VARCHAR(255) NOT NULL DEFAULT 'pending',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (client_id) REFERENCES clients(id),
    FOREIGN KEY (coach_id) REFERENCES coaches(id)
);