[Observium] Moving an interface from one device to another and having the graph follow

I just moved a transit link from router 1 to router 2. I cleared the old interface on router 1 and copied it to router 2. When I went back to my Observium graphs, the aggregate graphs picked up the interface in the transit aggregate graph, but all the old data was lost. I guess this doesn't really surprise me, although it might be kinda cool to have Observium automagically move the graph to the new interface if the new interface description matches, but that might be a little problematic if there was ever a case where a dedupe was required on interface descriptions, so I digress..

Is there a way to get that old data back somehow?

Thanks in advance.