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* Fix kvt headers * Provide differential layers for KVT transaction stack why: Significant performance improvement * Provide abstraction layer for database top cache layer why: This will eventually implemented as a differential database layers or transaction layers. The latter is needed to improve performance. behavioural changes: Zero vertex and keys (i.e. delete requests) are not optimised out until the last layer is written to the database. * Provide differential layers for Aristo transaction stack why: Significant performance improvement