Another point that it is necessary to deep: if the actual Entities and Associations caches use the Entity model? It would seem not. Rather, generic OGM model POJOs are used, both for the keys and for the values.

This model must be available server side, in order to work on the caches and execute the batch of operations.

If this were not confirmed, and there were also the Entities serialized in the caches, the feature would not be applicable to the use case, because OGM is a framework and the Entities used by the client are obviously not known a priori.