I’m a great fan of both Redis and GraphQL. You’ll find plenty of articles about them around on this site. Although I’ve showed many examples of GraphQL and Apps Script, it was never possible to connect up Apps Script to Redis, because redis doesn’t use HTTP to communicate between Client and Server. I’ve come across upstash.com (with a free tier), that fronts a redis database with a GraphQL API.
The upstash.com service looks like a nice find from Bruce Mcpherson and his post details how you can use this for cross platform caching.