code: def close(self):
          
          if self.conn:
              self.conn.close()
              self.conn = None
  
          fname = os.path.basename(self._path)
          checksum_persister = _get_checksum_persister(self._path)
          hasher = _initialize_hasher(self._path)
          with contextlib.closing(checksum_persister):
              checksum_persister[fname] = hasher.hexdigest()
docs: Close the event store.
  
          Important to close to not have any file descriptor leakages.