0 = Client submitted a request and it doesnt care what happens.(status sequence : 0->999->delete)
1 = Client submitted a request and is waiting for it to be completed (status
sequence : 1->999->2)
2 = Acknowledgment by the calc engine that a request was completed   (status
sequence :1 becomes 2, Client is responsible for deleting the record from queue)
100 = Ping/pong     (used to see whether calc service is alive and working,
used for communicating between ado calcs)
101 = Ping/pong     (used to see whether calc service is alive and working,
used for communicating between ado calcs)
999 = Request is pending - Calc engine is currently processing this request;
or calc engine crashed during this request (in that case the record is an
orphan and gets deleted next time the calc engine starts)