Watch out with DuckDB that if you have an open reader you can't open a writer. A writer must be the only connection. https://duckdb.org/faq#how-does-duckdb-han

Watch out with DuckDB that if you have an open reader you can't open a writer. A writer must be the only connection. https://duckdb.org/faq#how-does-duckdb-handle-concurrency https://duckdb.org/faq#how-does-duckdb-handle-concurrency