def METHOD_NAME(self, source, delfiles=True):
    """Remove a dataset from the persist store
    source : str or DataSource or Lo
        If a str, this is the unique ID of the original source, which is
        the key of the persisted dataset within the store. If a source,
        can be either the original or the persisted source.
    delfiles : bool
        Whether to remove the on-disc artifact
    """
    source = self.get_tok(source)
    with self.fs.open(self.path, "rb") as f:
        data = yaml.safe_load(f.read().decode())
    data["sources"].pop(source, None)
    with self.fs.open(self.path, "wb") as fo:
        fo.write(yaml.dump(data, default_flow_style=False).encode())
    if delfiles:
        path = posixpath.join(self.pdir, source)
        try:
            self.fs.rm(path, True)
        except Exception:
            logger.debug("Failed to delete persisted data dir %s" % path)
    self._entries.pop(source, None)