xiaoxia
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根因：create_job() 先 apply_async() 发送 Celery 任务，再 db.commit() 提交事务。 worker 是独立进程+独立DB连接，任务<4ms就被消费，但此时 API 事务还未 commit， worker 查询 job 返回 None → 静默 return 不重试 → job 永远卡在 tts_processing。 修复： 1. API侧（lipsync_service.py）：先 db.commit()+db.refresh(job)，再 apply_async() 发任务； 投递失败/MediaKit提交失败分支也各自 commit，确保状态及时落库。 2. Worker侧（lipsync_tts.py）：job not found 时改用 self.retry() 递增重试3次 （1s/3s/7s退避），作为竞态场景的第二道防线； 增加 autoretry_for=(OSError, ConnectionError) 自动重试网络抖动； max_retries 从2调整到5。 子agent在staging实锤：受影响job共5个，手工重投递后全部3秒内完成TTS+提交MediaKit， 证实TTS本身只需要2秒，卡顿完全是因为竞态。 单测：新增 TestCreateJobCommitOrder 验证 commit 在 apply_async 之前。