chore: release v0.20.7

internal/qso/qso.go

@@ -1954,23 +1954,21 @@ func (r *Repo) Count(ctx context.Context) (int64, error) {
 // operator who just worked someone before (re)starting OpsLog shows online right
 // away instead of waiting for their next QSO. Empty operator matches every QSO.
 func (r *Repo) LastQSOTime(ctx context.Context, operator string) (time.Time, bool) {
-	rows, err := r.db.QueryContext(ctx, `SELECT operator, qso_date FROM qso ORDER BY id DESC LIMIT 400`)
-	if err != nil {
-		return time.Time{}, false
-	}
-	defer rows.Close()
+	// ONE indexed row, not 400 filtered in Go: this runs every ~5 s (the ON-AIR
+	// badge) and ~15 s (live-status publish), so pulling 400 rows each time over a
+	// remote MySQL hammered the connection pool and, on a busy multi-op event, was a
+	// big part of "after a while nothing updates". Match the operator the same
+	// (case/space-insensitive) way, newest first.
 	opFilter := strings.ToUpper(strings.TrimSpace(operator))
-	for rows.Next() {
-		var oper, dateStr sql.NullString
-		if err := rows.Scan(&oper, &dateStr); err != nil {
-			return time.Time{}, false
-		}
-		if strings.ToUpper(strings.TrimSpace(oper.String)) != opFilter {
-			continue
-		}
-		if t := parseTimeLoose(dateStr.String).UTC(); !t.IsZero() {
-			return t, true
-		}
+	var dateStr sql.NullString
+	err := r.db.QueryRowContext(ctx,
+		`SELECT qso_date FROM qso WHERE UPPER(TRIM(operator)) = ? AND qso_date IS NOT NULL AND qso_date <> '' ORDER BY id DESC LIMIT 1`,
+		opFilter).Scan(&dateStr)
+	if err != nil {
+		return time.Time{}, false // ErrNoRows or a real error — no known last QSO
+	}
+	if t := parseTimeLoose(dateStr.String).UTC(); !t.IsZero() {
+		return t, true
 	}
 	return time.Time{}, false
 }