These are amazing questions Streetcat, We do some hyperparameter search using Optuna, we may be moving to Ray Tune because it can be highly parallelized. If MindsDB fails, it depends on how various DBs manage federated storage, but essentially you will get a query error. Funny that you mention automatic retraining, people have been asking for this recently, we will be supporting a retrain_frequency parameter in the coming releases, would you like to give it a test drive?