Good stuff. Not sure if it will help you or not, but I did this tutorial on searching account history by date and making the results for-loop-friendly. You can do:

async function main() {
    const result = seek("anonsteem", "2017-10-11");
    for await (const item of result) {
        console.log("Record %s", JSON.stringify({ operation: item.op[0], timestamp: item.timestamp }));
    }
}

Keep up the good stuff. I may use some of this for our reports in the dashboard.