-- 1. เพิ่มคอมลัมน์ใหม่ในตาราง jobs
ALTER TABLE `jobs` 
ADD COLUMN `is_scheduled` TINYINT(1) DEFAULT 0 AFTER `equipment_id`,
ADD COLUMN `scheduled_time` DATETIME DEFAULT NULL AFTER `is_scheduled`,
ADD COLUMN `infection_control` TINYINT(1) DEFAULT 0 AFTER `scheduled_time`,
ADD COLUMN `rating` INT DEFAULT NULL AFTER `completed_at`,
ADD COLUMN `feedback` TEXT DEFAULT NULL AFTER `rating`;

-- 2. สร้างตาราง job_messages (แชท)
CREATE TABLE IF NOT EXISTS `job_messages` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `job_id` INT NOT NULL,
  `user_id` INT NOT NULL,
  `message` TEXT NOT NULL,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (`job_id`) REFERENCES `jobs`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;