Implementations of the present disclosure include methods, systems, and computer-readable storage mediums for concurrent production use of an application and training of a modified application. Actions include receiving a change request that provides at least one application change for an application executed by a production system, retrieving, from the production system, a portion of production data associated to the at least one application change, executing training of a model of the application using the one or more production data to generate a trained model of the application, testing the trained model of the application to generate test results, extending the change request by adding the trained model, and providing, by the production system, the extended change request to deploy the at least one application change and the trained model to the production system.