code: public void add(String column, Object value) {
          add(System.currentTimeMillis(), column, value);
      }
docs: Add a data row, consisting of one column, to the store at the current time.
  
  See {@link #add(long, Map)} for more information.
  
  @param column The column for a field to value mapping
  @param value  The value for a field to value mapping