Feature/do not save cancelled task events twice (#575)

* do not save cancelled task events again

* actually only process cancelled events that were cancelled during the current run

---------

Co-authored-by: jasquat <jasquat@users.noreply.github.com>

spiffworkflow-backend/src/spiffworkflow_backend/services/task_service.py

@@ -213,6 +213,7 @@ class TaskService:
             event_type = ProcessInstanceEventType.task_completed.value
             if task_model.state == "CANCELLED":
                 event_type = ProcessInstanceEventType.task_cancelled.value
+
             timestamp = task_model.end_in_seconds or task_model.start_in_seconds or time.time()
             (
                 process_instance_event,

spiffworkflow-backend/src/spiffworkflow_backend/services/workflow_execution_service.py

@@ -201,6 +201,8 @@ class TaskModelSavingDelegate(EngineStepDelegate):
         self.spiff_tasks_to_process: set[UUID] = set()
         self.spiff_task_timestamps: dict[UUID, StartAndEndTimes] = {}
 
+        self.run_started_at = time.time()
+
         self.task_service = TaskService(
             process_instance=self.process_instance,
             serializer=self.serializer,
@@ -250,7 +252,6 @@ class TaskModelSavingDelegate(EngineStepDelegate):
         # 1ead87b4b496525df8cc0e27836c3e987d593dc0 if you are curious.
         for waiting_spiff_task in bpmn_process_instance.get_tasks(
             state=TaskState.WAITING
-            | TaskState.CANCELLED
             | TaskState.READY
             | TaskState.MAYBE
             | TaskState.LIKELY
@@ -260,6 +261,18 @@ class TaskModelSavingDelegate(EngineStepDelegate):
         ):
             self.task_service.update_task_model_with_spiff_task(waiting_spiff_task)
 
+        # only process cancelled tasks that were cancelled during this run
+        # NOTE: this could mean we do not add task models that we should be adding
+        # in which case we may have to remove the updated_ts filter here and
+        # instead just avoid creating the event in update_task_model_with_spiff_task
+        cancelled_spiff_tasks = bpmn_process_instance.get_tasks(
+            state=TaskState.CANCELLED, updated_ts=self.run_started_at
+        )
+        for cancelled_spiff_task in cancelled_spiff_tasks:
+            self.task_service.update_task_model_with_spiff_task(
+                spiff_task=cancelled_spiff_task,
+            )
+
         self.task_service.save_objects_to_database()
 
         if self.secondary_engine_step_delegate: