CREATE TABLE IF NOT EXISTS `email_templates` (
    `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(200) NOT NULL,
    `subject` VARCHAR(500) NOT NULL,
    `body_html` TEXT NOT NULL,
    `mailbox_id` INT UNSIGNED DEFAULT NULL,
    `is_active` TINYINT(1) NOT NULL DEFAULT 1,
    `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    KEY `idx_email_templates_mailbox` (`mailbox_id`),
    CONSTRAINT `fk_email_templates_mailbox` FOREIGN KEY (`mailbox_id`) REFERENCES `email_mailboxes` (`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;