def save_last_sync(self, ids, process):
        try:
            spec = {'_id': 'last_sync'}
            document = {'$set': {process: ids}}
            self.db.internal.update(spec, document, upsert=True)
        except Exception as e:
            raise DatabaseException(e)
def __init__(self, table=None, n_classes=2, class_names=("1", "0")):
        self.table = table
        self.n_classes = n_classes
        self.class_names = class_names
        if table is None:
            self.table = np.zeros((self.n_classes, self.n_classes), dtype=int)