datahub/datahub-web-react/src/graphql/dashboard.graphql

query getDashboard($urn: String!) {
    dashboard(urn: $urn) {
        ...dashboardFields
        downstreamLineage {
            ...downstreamRelationshipFields
        }
        upstreamLineage {
            ...upstreamRelationshipFields
        }
    }
}

mutation updateDashboard($input: DashboardUpdateInput!) {
    updateDashboard(input: $input) {
        ...dashboardFields
        downstreamLineage {
            ...downstreamRelationshipFields
        }
        upstreamLineage {
            ...upstreamRelationshipFields
        }
    }
}