1. Creating a question.
2. Duplicating a question (may not have a separate event, just make sure question_created is triggered)
3. Updating question, including moving it to new category.
4. Deleting a question.
5. Updating/moving a question category
6. Deleting a category.
7. Importing questions (may not have a separate event but make sure that question_created events are triggered for each imported question)
8. Exporting questions (crud=r)

There is an existing event for creating question category