curl --request POST \
  --url https://api.example.com/checkpoints/put-writes \
  --header 'Content-Type: application/json' \
  --data '
{
  "thread_id": "<string>",
  "checkpoint_id": "<string>",
  "writes": [
    {
      "task_id": "<string>",
      "idx": 123,
      "channel": "<string>",
      "blob": "<string>",
      "type": "<string>",
      "task_path": ""
    }
  ],
  "checkpoint_ns": "",
  "upsert": false
}
'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}