CREATE TABLE IF NOT EXISTS inventory_movements (
    id INT AUTO_INCREMENT PRIMARY KEY,
    tenant_id INT NOT NULL,
    job_id INT NOT NULL,
    inventory_item_id INT NOT NULL,
    assigned_user_id INT NOT NULL,
    quantity DECIMAL(10,2) NOT NULL,
    unit_cost DECIMAL(12,2) NOT NULL DEFAULT 0,
    total_cost DECIMAL(12,2) NOT NULL DEFAULT 0,
    notes TEXT NULL,
    created_at DATETIME NOT NULL
);