CREATE TABLE IF NOT EXISTS device_services (
device_number INTEGER,
service_number INTEGER,
+ payload_number INTEGER,
discriminant INTEGER,
last_seen LONG,
FOREIGN KEY(device_number) REFERENCES devices(device_number),
FOREIGN KEY(service_number) REFERENCES services(service_number),
+ FOREIGN KEY(payload_number) REFERENCES payloads(payload_number),
PRIMARY KEY(device_number, service_number)
);