1. A computer-implemented method, comprising: during uptime processing: generating at least one shadow database table corresponding to a new business object (BO) persistency model; establishing change recording for at least one database table associated with an old BO persistency model; retrieving, as changed data and using at least one computer, changed BO data from the at least one database table; transforming, as transformed data, the changed data to correspond to the new BO persistency model; writing the transformed data to the generated at least one shadow database table; and retrieving, as further changed data during a final uptime retrieval of the BO data, BO data from the at least one database table upon a determination that the BO data has changed in the at least one database table after a prior retrieval of the BO data from the at least one database table.