fix: bug sending LoTW on close

internal/qso/qso.go

@@ -519,6 +519,56 @@ func (r *Repo) ListForUpload(ctx context.Context, column, value string) ([]Uploa
 	return out, rows.Err()
 }
 
+// UploadCandidate is a QSO eligible for an on-close upload: its id plus its
+// STATION_CALLSIGN, so the caller can keep only the rows that belong to the
+// active logbook's callsign (a mixed-call DB — F4BPO, F4BPO/P, TM2Q — must not
+// all be signed under one cert).
+type UploadCandidate struct {
+	ID             int64
+	StationCallsign string
+}
+
+// ListUploadCandidates returns QSOs eligible for an on-close upload to a
+// service, scanning the whole logbook. For LoTW (column "lotw_sent"), statuses
+// is the set of sent-status values to treat as "to send" (e.g. N, R); rows
+// already "Y" are excluded. For QRZ/Club Log, statuses is ignored and anything
+// whose upload status isn't yet "Y" qualifies.
+func (r *Repo) ListUploadCandidates(ctx context.Context, column string, statuses []string) ([]UploadCandidate, error) {
+	if !uploadStatusCols[column] {
+		return nil, fmt.Errorf("invalid upload column %q", column)
+	}
+	var where string
+	var args []any
+	if column == "lotw_sent" {
+		if len(statuses) == 0 {
+			return nil, nil
+		}
+		ph := make([]string, len(statuses))
+		for i, s := range statuses {
+			ph[i] = "?"
+			args = append(args, strings.ToUpper(strings.TrimSpace(s)))
+		}
+		where = "UPPER(COALESCE(lotw_sent,'')) IN (" + strings.Join(ph, ",") + ")"
+	} else {
+		where = "UPPER(COALESCE(" + column + ",'')) <> 'Y'"
+	}
+	rows, err := r.db.QueryContext(ctx,
+		`SELECT id, COALESCE(station_callsign,'') FROM qso WHERE `+where+` ORDER BY qso_date`, args...)
+	if err != nil {
+		return nil, fmt.Errorf("list upload candidates: %w", err)
+	}
+	defer rows.Close()
+	var out []UploadCandidate
+	for rows.Next() {
+		var c UploadCandidate
+		if err := rows.Scan(&c.ID, &c.StationCallsign); err != nil {
+			return nil, err
+		}
+		out = append(out, c)
+	}
+	return out, rows.Err()
+}
+
 // MarkQRZUploaded stamps QRZCOM_QSO_UPLOAD_STATUS=Y and the upload date on
 // a QSO after a successful push to the QRZ.com logbook. date is an ADIF
 // YYYYMMDD string. Only the two QRZ columns are touched — no full-row