Function add_comparison_threshold_by_id 

pub(crate) fn add_comparison_threshold_by_id(
    config_json: &str,
    cfunc_id: i64,
    ftype_id: Option<i64>,
    cfunc_rtnval: &str,
    exec_order: Option<i64>,
    same_score: Option<i64>,
    close_score: Option<i64>,
    likely_score: Option<i64>,
    plausible_score: Option<i64>,
    un_likely_score: Option<i64>,
) -> Result<String>

Internal: Add comparison threshold by ID (for FFI use)