Change Details

Add new methods `entity_add` and `location_add` to the interface. Extend all backend implementations to support the new methods. Add pre-condition to `relation_add` (relying on the new methods) which simplifies its different implementations.

All entities now have a single `<entity>_add` method in the interface, with optional associated date if applicable. A new `location_add` is also added to the interface. Extend all backend implementations to support the new methods. Add pre-condition to `relation_add` (relying on the new methods) which simplifies its different implementations.

Add new methods `entity_add` and `locationAll entities now have a single `<entity>_add` tomethod in the interface., with optional Extend all backend implementassociated date if applicable. A new `locations to support_add` is also added to the new methodsinterface. Add pre-condiExtend all backend implementations to `relation_add` (relying on the new methods)support the new methods. Add pre-condition to `relation_add` (relying on the new methods) which simplifies its different implementations.