While looking in mdl_assign_submission, I noticed that records are created for some users only, who have not yet submitted anything, with status="new".
For others who have also not yet submitted, there are no records at all.
For ex. if there are two students, both of whom have not submitted an assignment, one of them might have a status=new and the other may not have any record in that table.
(The other status' are self explanatory)
Can anyone please provide some details on the assignment status/workflow for 3.1 (I couldn't find anything in the docs) or point me in the right direction.