Update an incident retrospective

curl --request PUT \
  --url https://api.rootly.com/v1/post_mortems/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "incident_post_mortems",
    "attributes": {
      "title": "<string>",
      "status": "draft",
      "started_at": "<string>",
      "mitigated_at": "<string>",
      "resolved_at": "<string>",
      "show_timeline": true,
      "show_timeline_trail": true,
      "show_timeline_genius": true,
      "show_timeline_tasks": true,
      "show_timeline_action_items": true,
      "show_services_impacted": true,
      "show_functionalities_impacted": true,
      "show_groups_impacted": true,
      "show_alerts_attached": true,
      "show_action_items": true,
      "cause_ids": [
        "<string>"
      ]
    }
  }
}'

{
  "data": {
    "id": "788af2e1-312e-4b9e-a2b2-a9529c077e0f",
    "type": "incident_post_mortems",
    "attributes": {
      "incident_id": "3151fafa-6ad4-40be-9a9f-25a3d88d9493",
      "title": "Retrospective updated",
      "status": "draft",
      "url": "https://test.rootly.com/account/post_mortems/a-voluptas-enim-natus",
      "short_url": null,
      "content": null,
      "published_at": null,
      "started_at": "2025-10-31T18:57:00.379-07:00",
      "mitigated_at": null,
      "resolved_at": null,
      "cancelled_at": null,
      "show_timeline": false,
      "show_timeline_starred_only": false,
      "show_timeline_genius": true,
      "show_timeline_trail": true,
      "show_timeline_tasks": true,
      "show_timeline_action_items": true,
      "show_timeline_order": "desc",
      "show_functionalities_impacted": true,
      "show_services_impacted": true,
      "show_groups_impacted": true,
      "show_action_items": true,
      "created_at": "2025-10-31T18:57:01.050-07:00",
      "updated_at": "2025-10-31T18:57:11.026-07:00"
    },
    "relationships": {
      "incident_retrospective_steps": {
        "data": []
      }
    }
  }
}