def get_dd_trace_headers() -> dict:
    """Return Datadog trace propagation headers from the current active span.
    Returns empty dict if ddtrace is not active or no span exists."""
    try:
        from ddtrace import tracer
        span = tracer.current_span()
        if not span:
            return {}
        return {
            'x-datadog-trace-id': str(span.trace_id & 0xFFFFFFFFFFFFFFFF),
            'x-datadog-parent-id': str(span.span_id),
            'x-datadog-sampling-priority': '1',
        }
    except ImportError:
        return {}