#define CREATE_DEVICE_SERVICES_TABLE "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) " \
"); "