Say I have a User model mapped to an actual DB table. But I want "extend" that user by pulling some extra meta data from an external API. Are there any examples of this online to look at? I tried adding my custom/extra fields to my graphql.schema file and got some resolver functions auto generated to process those fields, but not sure how to write the code in an optimized way so that I am not hitting the API for each and every field. Is there a better pattern to do this?