curl --request DELETE \
  --url http://localhost:8080/api/workspaces/{id}/projects/{project_id}/phases/{phase_order} \
  --header 'Authorization: Bearer <token>'

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