IO-1459 DMS Export marks bills as exported.

server/cdk/cdk-job-export.js

@@ -1324,6 +1324,10 @@ async function MarkJobExported(socket, jobid) {
         successful: true,
         useremail: socket.user.email,
       },
+      bill: {
+        exported: true,
+        exported_at: new Date(),
+      },
     });
 
   return result;