[rzmk]

Maybe try the to [1] and sqlp [2] commands from the qsv fork. From the README:

sqlp: Run blazing-fast Polars SQL queries against several CSVs - converting queries to fast LazyFrame expressions, processing larger than memory CSV files.

to: Convert CSV files to PostgreSQL, SQLite, XLSX, Parquet and Data Package.

[1] https://github.com/jqnatividad/qsv/blob/master/src/cmd/sqlp....

[2] https://github.com/jqnatividad/qsv/blob/master/src/cmd/to.rs...