docs: def clear_from(self, timestamp):
          """Clear all data from `timestamp` onwards. Note that the timestamp
          is rounded down to the nearest block boundary"""
          block_size = self.config.block_size
          offset, remainder = timestamp // block_size, timestamp % block_size
          if remainder:
              raise ValueError('Timestamp must be on a block boundary')
          self.driver.clear_from(offset, timestamp)