code: func (e *Engine) DeleteSeriesRange(itr tsdb.SeriesIterator, min, max int64) error {
  	return e.DeleteSeriesRangeWithPredicate(itr, func(name []byte, tags models.Tags) (int64, int64, bool) {
  		return min, max, true
  	})
  }
docs: // DeleteSeriesRange removes the values between min and max (inclusive) from all series