I would like a feature where I can flag a Node as "Archived". By doing this the node would no longer be managed and all of the performance data for that node would be archived and essentially frozen in time for historical reference. By doing this it would prevent the data consolidation process from occurring on any of the performance data for that node and would also allow you to add a new node into the system with the same IP.
have you tried to use "Node External" feature? this will exclude node polling but you can still keep all node related historical data unless you exceed DB retention period. Or this is not enough?