code: private byte[] getDataSourceMetadataWithHandleAsBytes(
        final Handle handle,
        final String dataSource
    )
    {
      return connector.lookupWithHandle(
          handle,
          dbTables.getDataSourceTable(),
          "dataSource",
          "commit_metadata_payload",
          dataSource
      );
    }
docs: Read dataSource metadata as bytes, from a specific handle. Returns null if there is no metadata.