DuckDB can do exactly this, once you get the API working in your system, it becomes something simple like

    SELECT \* from read_csv('example.csv');

Writing generally involves reading to an in-memory database, making whatever changes you want, then something like

    COPY new_table TO 'example.csv' (HEADER true, DELIMITER ',');

I wrote a CSV DB engine once! I can't remember why. For fun?

Postgres can do that as well.

SQLite can do it