I'm currently rewriting https://github.com/ownstats/ownstats to this model, with a slight difference that I stream Arrow data from a AWS Lambda Function URL into DuckDB WASM in the frontend... Works great.

An improvement could be having pre-calculated DuckDB database files that are directly attached from the DuckDB WASM frontend, see https://duckdb.org/docs/guides/network_cloud_storage/duckdb_...