-- +goose Up
-- +goose StatementBegin

CREATE TABLE IF NOT EXISTS chat_qrcode_delivery_tasks (
  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
  conversation_id BIGINT UNSIGNED NOT NULL COMMENT '待补发二维码的会话ID',
  status VARCHAR(16) NOT NULL DEFAULT 'pending' COMMENT '任务状态: pending待补发, sent已补发, failed失败',
  qrcode_id BIGINT UNSIGNED NULL COMMENT '补发使用的二维码ID',
  error_message VARCHAR(255) NOT NULL DEFAULT '' COMMENT '失败原因',
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  sent_at DATETIME NULL COMMENT '补发完成时间',
  UNIQUE KEY uk_qrcode_delivery_conversation (conversation_id),
  KEY idx_qrcode_delivery_status_created (status, created_at),
  KEY idx_qrcode_delivery_qrcode (qrcode_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='发布群二维码补发任务';

-- +goose StatementEnd

-- +goose Down
-- +goose StatementBegin

DROP TABLE IF EXISTS chat_qrcode_delivery_tasks;

-- +goose StatementEnd