def get_txids_filtered(connection, asset_id, operation=None):
    """Return all transactions for a particular asset id and optional operation.

    Args:
        asset_id (str): ID of transaction that defined the asset
        operation (str) (optional): Operation to filter on
    """

    raise NotImplementedError
Return all transactions for a particular asset id and optional operation.

Args:
asset_id (str): ID of transaction that defined the asset
operation (str) (optional): Operation to filter on
bigchaindb/backend/query.py