-- Create inventory_adjustments table
CREATE TABLE IF NOT EXISTS inventory_adjustments (
    id INT PRIMARY KEY AUTO_INCREMENT,
    product_id INT NOT NULL,
    quantity_change INT NOT NULL,
    reason VARCHAR(255) NOT NULL,
    adjustment_date DATE NOT NULL,
    staff_id INT NOT NULL,
    notes TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (product_id) REFERENCES inventory(id),
    FOREIGN KEY (staff_id) REFERENCES users(id)
);