Well, if all you want is managed, per request hosting of SQL, use Aurora serverless! It's a game changer. As for Dynamo vs SQL -- you really cannot substitute one for the other. They're different tools for different jobs. Dynamo is extremely low latency and great for that purpose, while SQL is great for being a store of record, and if you use it as long as you can get away with it for as many things as possible, it's usually not a bad idea.
