With NET-395 there is support for Cloud Integration Expressions. It would be nice to support cloud-based expressions more generally, that could be applied to any datum as it is stored.

This would require a managed list of Expression entities, somehow associated with a node + source ID pair. The Expression would need access to the current datum, and ideally things like node/user/stream metadata. Access to datum streams more generally might be considered (i.e. access to datum history), but brings with it much higher infrastructure resource costs and might be left as a possible future task.