Function run_query 

pub fn run_query(
    db_dir: &Path,
    cypher: &str,
    role: Option<&str>,
    namespace: Option<&str>,
) -> Result<String, CliError>

Run a Cypher read or write and print columns/rows like run_asof.

role answers as one of the store’s roles and namespace from one namespace; together they intersect, so a role bound to one namespace never sees another and naming a namespace outside its binding answers with nothing. Either one makes the query a read: a restricted write is refused.