-- Local outbound message queue.
--
-- Added when fitme3070 stopped relaying mail through the hub's /notify endpoint
-- and went back to sending its own, PHPMailer over SMTP. Mirrors the
-- fotografia.andmore.pt table so the shared queue code ports unchanged.
--
-- Safe to re-run.

CREATE TABLE IF NOT EXISTS `message_queue` (
  `id`              INT(11) NOT NULL AUTO_INCREMENT,
  `channel`         ENUM('email','sms','whatsapp') NOT NULL DEFAULT 'email',
  `status`          ENUM('pending','sending','sent','failed','cancelled') NOT NULL DEFAULT 'pending',
  `to_user_id`      INT(11) DEFAULT NULL,
  `to_address`      VARCHAR(255) NOT NULL,
  `to_name`         VARCHAR(150) DEFAULT NULL,
  `reply_to`        VARCHAR(190) DEFAULT NULL,
  `subject`         VARCHAR(255) DEFAULT NULL,
  `body`            LONGTEXT NOT NULL,
  `alt_body`        TEXT DEFAULT NULL,
  `context_type`    VARCHAR(50) DEFAULT NULL,
  `context_id`      INT(11) DEFAULT NULL,
  `scheduled_for`   DATETIME DEFAULT NULL,
  `attempts`        INT(11) NOT NULL DEFAULT 0,
  `max_attempts`    INT(11) NOT NULL DEFAULT 3,
  `next_attempt_at` DATETIME DEFAULT NULL,
  `last_error`      TEXT DEFAULT NULL,
  `created_by`      INT(11) DEFAULT NULL,
  `sent_at`         DATETIME DEFAULT NULL,
  `created_at`      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `deleted_at`      DATETIME DEFAULT NULL,
  PRIMARY KEY (`id`),
  -- The drainer's hot query: pending/failed rows whose turn has come.
  KEY `idx_mq_drain` (`status`, `next_attempt_at`, `scheduled_for`),
  KEY `idx_mq_created` (`created_at`),
  KEY `idx_mq_context` (`context_type`, `context_id`),
  KEY `idx_mq_deleted` (`deleted_at`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- No foreign key on to_user_id / created_by: messages outlive the accounts they
-- were sent to, and the delivery history is worth more than the referential
-- tidiness. The Monitor page tolerates a missing user.