1. A method, comprising: deprecating a first class of an object-oriented model of a computer-implemented database; selecting a second class of the object-oriented model as a replacement for the first class; migrating data associated with a first instance of the first class to a second instance of the second class by: marking the first class as deprecated in the object-oriented model, creating a mapping between the first class and the second class, based on the mapping between the first class and the second class, creating the second instance of the second class, and moving the data from the first instance of the first class to the second instance of the second class; and manipulating a call from an existing application for the first instance of the first class to use the second instance of the second class based on the mapping, so that the existing application continues to function.