code: def export_schema_to_dict(back_references):
      
      databases = [Database.export_schema(recursive=True,
                   include_parent_ref=back_references)]
      clusters = [DruidCluster.export_schema(recursive=True,
                  include_parent_ref=back_references)]
      data = dict()
      if databases:
          data[DATABASES_KEY] = databases
      if clusters:
          data[DRUID_CLUSTERS_KEY] = clusters
      return data
docs: Exports the supported import/export schema to a dictionary