for nice visual feedback to the user, move each old schedulable unit to the lower_bound

SAS/TMSS/backend/services/scheduling/lib/dynamic_scheduling.py

@@ -351,6 +351,11 @@ class Scheduler:
                         # just advance
                         lower_bound += timedelta(hours=3)
 
+                    # for nice "visual" feedback to the user, move each "old" schedulable unit to the lower_bound
+                    # this also indicates to the user that the unit has been considered for times < lower_bound, and they could not be scheduled there.
+                    for unit in get_dynamically_schedulable_scheduling_units().filter(scheduled_start_time__lt=lower_bound).all():
+                        update_subtasks_start_times_for_scheduling_unit(unit, lower_bound)
+
                 # any units left to be scheduled? If so, loop again, else break out of while loop
                 if not get_dynamically_schedulable_scheduling_units().exists():
                     # there are no more schedulable units. check to-be-re-evaluated scheduled future units.