Python 3 port: /!\ Python 3.6+ is now needed to use SàT Pubsub /!\ instability may occur and features may not be working anymore, this will improve with time The same procedure as in backend has been applied (check backend commit ab2696e34d29 logs for details). Python minimal version has been updated in setup.py

create table callbacks (
    service text not null,
    node text not null,
    uri text not null,
    PRIMARY KEY (service, node, uri)
);