pub fn fts_query(q: &str) -> Option<String> {
    let terms: Vec<String> = q
        .split_whitespace()
        .map(|t| t.trim_matches(['"', '\'', '*', '(', ')', ':', '[', ']']))
        .filter(|t| !t.is_empty())
        .map(|t| format!("\"{}\"", t))
        .collect();
    if terms.is_empty() {
        None
    } else {
        Some(terms.join(" AND "))
    }
}