Function aggregateDailyTraffic

internal/usage/summary.go:306–351

aggregateDailyTraffic 将原始节点日记录按日期聚合，填充完整的 days 天窗口，并计算图表高度比例。

(raw []nodes.NodeDailyUsage, days int)

// aggregateDailyTraffic 将原始节点日记录按日期聚合，填充完整的 days 天窗口，并计算图表高度比例。
func aggregateDailyTraffic(raw []nodes.NodeDailyUsage, days int) []DailyTrafficPoint {
	byDate := make(map[string]*DailyTrafficPoint, days)
	for _, r := range raw {
		p, ok := byDate[r.Date]
		if !ok {
			t, _ := time.Parse("2006-01-02", r.Date)
			byDate[r.Date] = &DailyTrafficPoint{
				Date:  r.Date,
				Label: fmt.Sprintf("%d/%d", int(t.Month()), t.Day()),
			}
			p = byDate[r.Date]
		}
		p.UploadBytes += r.UploadBytes
		p.DownloadBytes += r.DownloadBytes
		p.TotalBytes += r.UploadBytes + r.DownloadBytes
	}

	result := make([]DailyTrafficPoint, days)
	now := time.Now().UTC()
	for i := range result {
		d := now.AddDate(0, 0, -(days - 1 - i))
		dateStr := d.Format("2006-01-02")
		if p, ok := byDate[dateStr]; ok {
			result[i] = *p
		} else {
			result[i] = DailyTrafficPoint{
				Date:  dateStr,
				Label: fmt.Sprintf("%d/%d", int(d.Month()), d.Day()),
			}
		}
	}

	var maxBytes int64
	for _, p := range result {
		if p.TotalBytes > maxBytes {
			maxBytes = p.TotalBytes
		}
	}
	if maxBytes > 0 {
		for i := range result {
			result[i].HeightPct = float64(result[i].TotalBytes) / float64(maxBytes) * 100
		}
	}

	return result
}

// aggregateNodePeriodStats 按节点汇总时段内的流量增量（来自 daily_usage 原始记录）。
func aggregateNodePeriodStats(raw []nodes.NodeDailyUsage, nodeList []nodes.Node) []NodePeriodStat {