def insert(self, doc, synced=False):
        doc.id = self.get_next_id()
        doc.synced = synced
        try:
            self.db.docs.insert(doc)
        except Exception as e:
            raise DatabaseException(e)
        return doc
def __init__(self):
        self._cache = {}
        self._bucket_client = None
        self._param_client = None
        self._secret_client = None