USE baiyue_audit;

DROP PROCEDURE IF EXISTS add_audit_event_id;
DELIMITER $$
CREATE PROCEDURE add_audit_event_id()
BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.COLUMNS
    WHERE TABLE_SCHEMA='baiyue_audit' AND TABLE_NAME='sys_audit_log' AND COLUMN_NAME='event_id'
  ) THEN
    ALTER TABLE sys_audit_log ADD COLUMN event_id VARCHAR(64) NULL COMMENT '审计事件全局唯一ID' AFTER id;
  END IF;
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.STATISTICS
    WHERE TABLE_SCHEMA='baiyue_audit' AND TABLE_NAME='sys_audit_log' AND INDEX_NAME='uk_audit_event_id'
  ) THEN
    ALTER TABLE sys_audit_log ADD UNIQUE KEY uk_audit_event_id (event_id);
  END IF;
END$$
DELIMITER ;
CALL add_audit_event_id();
DROP PROCEDURE IF EXISTS add_audit_event_id;

CREATE TABLE IF NOT EXISTS sys_audit_dead_letter (
  id BIGINT NOT NULL AUTO_INCREMENT COMMENT '死信记录自增ID',
  event_id VARCHAR(64) NOT NULL COMMENT '审计事件全局唯一ID',
  payload_text LONGTEXT NOT NULL COMMENT 'RocketMQ死信原始载荷',
  status VARCHAR(16) NOT NULL DEFAULT 'PENDING' COMMENT '状态：PENDING待补偿、PROCESSING处理中、PROCESSED已处理、DEAD永久失败',
  retry_count INT NOT NULL DEFAULT 0 COMMENT '死信重试次数',
  next_retry_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '下次允许补偿时间',
  lease_owner VARCHAR(128) NULL COMMENT '当前补偿租约持有实例',
  lease_until DATETIME(3) NULL COMMENT '当前补偿租约截止时间',
  last_error VARCHAR(1000) NULL COMMENT '最近一次补偿错误',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '死信记录创建时间',
  processed_at DATETIME(3) NULL COMMENT '补偿处理完成时间',
  PRIMARY KEY (id),
  UNIQUE KEY uk_audit_dead_event (event_id),
  KEY idx_audit_dead_retry (status, next_retry_at, lease_until)
) ENGINE=InnoDB COMMENT='审计消息死信补偿表';