query getRevisionParents {
  revision(swhid: "swh:1:rev:db44dc9cf7a6af7b56d8ebda8c75be3375c89282") {
    message {
      text
    }
    parents {
      edges {
        node {
          message {
            text
          }
          parents {
            edges {
              node {
                message {
                  text
                }
              }
            }
          }
        }
      }
    }
  }
}