Cool! I don't understand the exact "schema" issue. Is that your database schema? Having written frameworks for deploying lambda in the past, I can say as recently as 2018 lambda was fairly hard to debug and in general using AWS is difficult for small companies. It's really designed for big business and large organizations where it works really well.
There are some workarounds, for example if your data ingestion is a lot of users uploading excel files, you can just upload from the client side directly to S3 with a pre-signed S3 URL without having to touch lambda. Then you can process the data on S3 using lambda or whatever you want. There are other strategies if you're ingesting real time data.
Yeah, if you're just using plain TypeScript you can certainly re-write crud apps all day and that definitely happens, in fact it's almost certain to happen.
Thanks for sharing. Following along to see how this works for you.