rel = client.relationships.retrieve(external_id="flow1")
rel.confidence = 0.75
res = client.relationships.update(rel)

from cognite.client.data_classes import RelationshipUpdate
my_update = RelationshipUpdate(external_id="flow_1").source_external_id.set("alternate_source").confidence.set(0.97)
res1 = client.relationships.update(my_update)
another_update = RelationshipUpdate(external_id="flow_1").confidence.set(None)
res2 = client.relationships.update(another_update)

from cognite.client.data_classes import RelationshipUpdate
my_update = RelationshipUpdate(external_id="flow_1").labels.add(["PUMP", "VERIFIED"])
res = client.relationships.update(my_update)

from cognite.client.data_classes import RelationshipUpdate
my_update = RelationshipUpdate(external_id="flow_1").labels.remove("PUMP")
res = client.relationships.update(my_update)

{
  "items": [
    {
      "externalId": "<string>",
      "sourceExternalId": "<string>",
      "sourceType": "asset",
      "targetExternalId": "<string>",
      "targetType": "asset",
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000,
      "startTime": 1730204346000,
      "endTime": 1730204346000,
      "confidence": 0.5,
      "dataSetId": 4503599627370496,
      "labels": [
        {
          "externalId": "my.known.id"
        }
      ]
    }
  ]
}