TaskCanceledEvent

EventType: TASK_CANCELEDDomain: collaboration Broker subject: progress.notification.task

Cancels a task by setting its status to CANCELED and optionally recording a cancellation reason.

Trigger

Triggered by: POST /event (universal event dispatcher)

Dispatched via POST /event in backend/api/endpoints/traceability.py with event_type: TASK_CANCELED.

Preconditions

• Task exists with key info.task_key
• Task is not already canceled or completed

State Changes (Transaction)

Collections: Task

• Task updated: status → CANCELED, optional reason stored

Side Effects (post_processing)

Publishes to progress.notification.task after commit.

InfoModel Fields

Field	Type	Description
task_key	str	ArangoDB key of the task to cancel
reason	str | None	Reason for cancellation

Related Events

None.

Source

TaskCanceledEvent on GitHub