The only long term answer is to detach the data stores from the applications which process them. It is the migration between apps that leads to this data orphan

The only long term answer is to detach the data stores from the applications which process them. It is the migration between apps that leads to this data orphaning. This also leads to the conclusion that a standard mechanism for interfacing to the data from multiple apps on multiple data backends is needed. The Android storage framework is probably the best effort at this so far, but it's far from clear how used it is.