const timeseries = await client.timeseries.update([{
  id: 3785438579439,
  update: {
    name: { set: 'New name' }
  }
}]);

res = client.time_series.retrieve(id=1)
res.description = "New description"
res = client.time_series.update(res)

from cognite.client.data_classes import TimeSeriesUpdate
my_update = TimeSeriesUpdate(id=1).description.set("New description").metadata.add({"key": "value"})
res = client.time_series.update(my_update)

from cognite.client.data_classes import TimeSeriesUpdate
from cognite.client.data_classes.data_modeling import NodeId

my_update = (
    TimeSeriesUpdate(instance_id=NodeId("test", "hello"))
    .external_id.set("test:hello")
    .metadata.add({"test": "hello"})
)
client.time_series.update(my_update)

client.timeseries().upsert(upsertTimeseriesList);

curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/timeseries/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "id": 4503599627370496,
      "update": {
        "externalId": {
          "set": "<string>"
        },
        "name": {
          "set": "<string>"
        },
        "metadata": {
          "set": {
            "key1": "value1",
            "key2": "value2"
          }
        },
        "unit": {
          "set": "<string>"
        },
        "unitExternalId": {
          "set": "<string>"
        },
        "assetId": {
          "set": 123
        },
        "description": {
          "set": "<string>"
        },
        "securityCategories": {
          "set": [
            123
          ]
        },
        "dataSetId": {
          "set": 123
        }
      }
    }
  ]
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{cluster}.cognitedata.com/api/v1/projects/{project}/timeseries/update",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'items' => [
        [
                'id' => 4503599627370496,
                'update' => [
                                'externalId' => [
                                                                'set' => '<string>'
                                ],
                                'name' => [
                                                                'set' => '<string>'
                                ],
                                'metadata' => [
                                                                'set' => [
                                                                                                                                'key1' => 'value1',
                                                                                                                                'key2' => 'value2'
                                                                ]
                                ],
                                'unit' => [
                                                                'set' => '<string>'
                                ],
                                'unitExternalId' => [
                                                                'set' => '<string>'
                                ],
                                'assetId' => [
                                                                'set' => 123
                                ],
                                'description' => [
                                                                'set' => '<string>'
                                ],
                                'securityCategories' => [
                                                                'set' => [
                                                                                                                                123
                                                                ]
                                ],
                                'dataSetId' => [
                                                                'set' => 123
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{cluster}.cognitedata.com/api/v1/projects/{project}/timeseries/update"

	payload := strings.NewReader("{\n  \"items\": [\n    {\n      \"id\": 4503599627370496,\n      \"update\": {\n        \"externalId\": {\n          \"set\": \"<string>\"\n        },\n        \"name\": {\n          \"set\": \"<string>\"\n        },\n        \"metadata\": {\n          \"set\": {\n            \"key1\": \"value1\",\n            \"key2\": \"value2\"\n          }\n        },\n        \"unit\": {\n          \"set\": \"<string>\"\n        },\n        \"unitExternalId\": {\n          \"set\": \"<string>\"\n        },\n        \"assetId\": {\n          \"set\": 123\n        },\n        \"description\": {\n          \"set\": \"<string>\"\n        },\n        \"securityCategories\": {\n          \"set\": [\n            123\n          ]\n        },\n        \"dataSetId\": {\n          \"set\": 123\n        }\n      }\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://{cluster}.cognitedata.com/api/v1/projects/{project}/timeseries/update")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    {\n      \"id\": 4503599627370496,\n      \"update\": {\n        \"externalId\": {\n          \"set\": \"<string>\"\n        },\n        \"name\": {\n          \"set\": \"<string>\"\n        },\n        \"metadata\": {\n          \"set\": {\n            \"key1\": \"value1\",\n            \"key2\": \"value2\"\n          }\n        },\n        \"unit\": {\n          \"set\": \"<string>\"\n        },\n        \"unitExternalId\": {\n          \"set\": \"<string>\"\n        },\n        \"assetId\": {\n          \"set\": 123\n        },\n        \"description\": {\n          \"set\": \"<string>\"\n        },\n        \"securityCategories\": {\n          \"set\": [\n            123\n          ]\n        },\n        \"dataSetId\": {\n          \"set\": 123\n        }\n      }\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "items": [
    {
      "id": 4503599627370496,
      "isString": true,
      "type": "<string>",
      "isStep": true,
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000,
      "externalId": "<string>",
      "instanceId": {
        "space": "<string>",
        "externalId": "<string>"
      },
      "name": "<string>",
      "metadata": {},
      "unit": "<string>",
      "unitExternalId": "<string>",
      "assetId": 4503599627370496,
      "description": "<string>",
      "securityCategories": [
        123
      ],
      "dataSetId": 4503599627370496
    }
  ]
}

{
  "error": {
    "code": 400,
    "message": "<string>",
    "missing": [
      {
        "id": 4503599627370496
      }
    ]
  }
}

{
  "error": {
    "code": 409,
    "message": "<string>",
    "duplicated": [
      {
        "externalId": "my.known.id"
      }
    ]
  }
}

{
  "error": {
    "code": 422,
    "message": "<string>",
    "duplicated": [
      {
        "id": 4503599627370496
      }
    ]
  }
}