docs: public Deferred<Object> delete(final TSDB tsdb) {
      if (start_time < 1) {
        throw new IllegalArgumentException("The start timestamp has not been set");
      }
      
      final byte[] tsuid_byte = tsuid != null && !tsuid.isEmpty() ? 
          UniqueId.stringToUid(tsuid) : null;
      final DeleteRequest delete = new DeleteRequest(tsdb.dataTable(), 
          getRowKey(start_time, tsuid_byte), FAMILY, 
          getQualifier(start_time));
      return tsdb.getClient().delete(delete);
    }