CREATE TABLE IF NOT EXISTS `invoices` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `customer_id` int(11) NOT NULL,
  `invoice_date` date NOT NULL,
  `due_date` date NOT NULL,
  `total` decimal(10,2) NOT NULL,
  `status` varchar(20) NOT NULL DEFAULT 'Draft',
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `customer_id` (`customer_id`),
  CONSTRAINT `invoices_ibfk_1` FOREIGN KEY (`customer_id`) REFERENCES `customers` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;