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Kira 没有独立的 DELETE /agent/message 端点。删除一条 AI 消息及其之后全部内容通过 POST /agent/streaming 的 anchorMessageId 参数级联执行。

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机制

调用 POST /agent/streaming 时携带 anchorMessageId： 
{
  "message": { ... },
  "threadId": "...",
  "anchorMessageId": "msg-uuid",
  "model": "lite"
}
后端执行 (src/hono/agent/index.ts:276-341)：
  1. 查 anchorMessageId.created_at
  2. DELETE FROM messages WHERE thread_id = ? AND created_at > anchor.created_at
  3. DELETE FROM thread_version WHERE thread_id = ? AND created_at > anchor.created_at
  4. 从被删除的 version 中 extractVideoTaskIds / extractMusicTaskIds
  5. purgeVideoTasks / purgeMusicTasks 发 video|music/task.cancelled Inngest event
  6. Redis SET cancel:{taskId} 1 EX 3600
  7. deleteStorageFiles(userId, affectedFileIds) 清理 Storage（非阻塞）
之后正常走 /agent/streaming SSE 流，以 anchor 为新分支起点。

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取消正在运行的任务

被删除 version 里的 pending / processing 任务：
  • Inngest cleanup function 退款 + 通知 failed / cancelled
  • Worker 每个 step 开头检查 Redis cancel key，命中即 throw NonRetriableError

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