Constant INSERT_REQUEST_SQL 

pub const INSERT_REQUEST_SQL: &str = "
INSERT INTO requests (
    request_id, ts, proxy, session_id,
    method, tool,
    latency_us, status, error_code, error_msg,
    bytes_in, bytes_out
) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12);
";

INSERT a new request row. All parameters are positional (?1 .. ?12).