Kafka事件重复消费时,多个消费者同时创建签约任务会导致唯一约束冲突 改用upsert确保幂等性,如果orderNo已存在则返回现有记录 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>