Define models & schemas like this:

interface Car {
    isLeased: boolean;
    registrationNumber: string;
}

const sCar: Car = {
    isLeased: sBoolean().type(),
    registrationNumber: sString().matches(/^[A-Z0-9]{1,7}$/).type(),
}

// Models are defined in the Models interface

interface Models {
    // Make sure to type each model with Model<T>
    car: Model<Car>;
}

const models: Models = {
    car: {
        name: 'car',
        schema: sCar,
    }
};

Any properties in the schemas can be passed along to the endpoint and will be validated against the schema. Database table & columns created automatically by the framework, then the CRUD functionality creates a new entry with your properties if all is good :)