I have not seen anything open source that really separates compute and storage like that in one package. You can setup Clickhouse to use an object store but there's a bunch of nuance there. People are starting to hack together something similar using DuckDB on Lambda, basically as a query engine on top of S3. I wonder if you can use DuckDb to get a SQL interface going?
Going to have to take a close look for sure. SQL is definitely a blocker. With Supabase we give people the ability to query their logs with full SQL. And with Logflare Endpoints you create an API endpoint with a SQL query.