In my app I have a main context A and a sub-context B which has A as its parent. In context B I insert many objects that are rarely needed, so I would like to just write them to disk without keeping them in memory. Currently I call contextB.reset() which frees some memory, but those objects still exist in context A. How can I wipe them out of context A without permanently deleting them and without affecting all the other entities that I fetch using context A? I cannot call contextA.reset() because then all the entity references that I still need become invalid, but I couldn't find a way of making a context selectively forget about entities.
