def METHOD_NAME(self) -> Dict[int, Any]:
    """Map DB ids to integer ids.
    Returns:
        a dictionary of document titles and correspondent integer indices
    """
    doc2idx = {doc_id: i for i, doc_id in enumerate(self.doc_ids)}
    logger.info(
        "SQLite iterator: The size of the database is {} documents".format(len(doc2idx)))
    return doc2idx