Topics should be able to expire so that they don't show up in the standard views for end users anymore. This is important to manage the 'flood' of topics and make it easier for users to find the important topics. Often topics have only a short life cycle (e.g. 'car window is open') and should be cleared up automatically.
There should be separate features available:
- Auto expiration (configurable via policy)- User triggered expiration timer (e.g. expire in x days)
- User triggered immediate expiration and keep active setting
See here for more - idea 012.03