addBackendDataChildren :: HashMap Text (BackendData p m h)
                       -> BackendData p m h
                       -> BackendData p m h
addBackendDataChildren children bd =
    bd { bdChildren = children <> bdChildren bd }
addBackendDataChildren :: HashMap Text (BackendData p m h)
                       -> BackendData p m h
                       -> BackendData p m h
addBackendDataChildren children bd =
    bd { bdChildren = children <> bdChildren bd }
addBackendDataChildren children bd =
    bd { bdChildren = children <> bdChildren bd }