onRecordCreate((e) => {
    if (e.record.getString("quote_number") !== "") {
        e.next();
        return;
    }

    try {
        var now = new Date();
        var year = now.getFullYear();
        var month = String(now.getMonth() + 1).padStart(2, '0');
        var prefix = "Q" + year + month;

        let attempts = 0;
        let candidate;

        do {
            // findRecordsByFilter accepts sort as the 3rd arg.
            // findFirstRecordByFilter's 3rd arg is params (dbx.Params),
            // which is why the old "-quote_number" sort string threw
            // "could not convert -quote_number to dbx.Params".
            const records = $app.findRecordsByFilter(
                "quotes",
                "quote_number != ''",
                "-quote_number",
                1,
                0
            );

            let newNum = 1;
            if (records && records.length > 0) {
                var raw = records[0].getString("quote_number");
                // Extract trailing digits (handles Q202607011,
                // legacy Q-2026-07-011, Q1782862717620, etc.).
                var m = raw.match(/(\d+)$/);
                if (m) {
                    newNum = parseInt(m[1], 10) + 1 + attempts;
                }
            }

            candidate = prefix + String(newNum).padStart(3, '0');
            attempts++;

            // check if this candidate already exists
            var exists;
            try {
                exists = $app.findFirstRecordByFilter(
                    "quotes",
                    "quote_number = {:num}",
                    { num: candidate }
                );
            } catch (e) {
                exists = null; // not found throws in some versions
            }
        } while (exists && attempts < 5);

        e.record.set("quote_number", candidate);
    } catch (err) {
        console.error("Auto-numbering error:", err);
        e.record.set("quote_number", "Q" + Date.now()); // fallback that's at least unique
    }

    e.next();
}, "quotes");