A delta handler can allow calculation of difference between an already generated set of backend entities and a set of new entities necessary to support a primary object affected by a change made in a development environment supporting extensions to a backend model of a software architecture. Improved stability and robustness can be provided via an approach in which a target list of activities relating to creating, changing, or deleting of entities in backend repositories necessary to support the affected primary object is created and a sequence for performance of the activities in the target list is determined in a manner that can allow handling of such activities in a unified manner rather than on a per object type basis. Related methods, systems, articles of manufacture, and the like are described.