UpdatedAt time.Time
}

func (l *lastDayTierStats) addStats(ts tierStats) {
	now := time.Now()
	l.forwardTo(now)

	nowIdx := now.Hour()
	l.Bins[nowIdx] = l.Bins[nowIdx].add(ts)
}

// forwardTo moves time to t, clearing entries between last update and t.
func (l *lastDayTierStats) forwardTo(t time.Time) {
	if t.IsZero() {
		t = time.Now()
	}

	since := t.Sub(l.UpdatedAt).Hours()

)

var (
	// De-facto standard header keys.
	xForwardedFor    = http.CanonicalHeaderKey("X-Forwarded-For")
	xForwardedHost   = http.CanonicalHeaderKey("X-Forwarded-Host")
	xForwardedPort   = http.CanonicalHeaderKey("X-Forwarded-Port")
	xForwardedProto  = http.CanonicalHeaderKey("X-Forwarded-Proto")
	xForwardedScheme = http.CanonicalHeaderKey("X-Forwarded-Scheme")
	xRealIP          = http.CanonicalHeaderKey("X-Real-IP")
)

var (

		{xForwardedScheme, "http", "http"},
		{xForwardedScheme, "HTTP", "http"},
		{forwarded, `For="[2001:db8:cafe::17]:4711`, ""},                    // No proto
		{forwarded, `for=192.0.2.43, for=198.51.100.17;proto=https`, ""},    // Multiple params, will be empty.
		{forwarded, `for=172.32.10.15; proto=https;by=127.0.0.1;`, "https"}, // Space before proto
		{forwarded, `for=192.0.2.60;proto=http;by=203.0.113.43`, "http"},    // Multiple params
	}

		}
	}

	var dataUsageInfo DataUsageInfo
	json := jsoniter.ConfigCompatibleWithStandardLibrary
	if err = json.Unmarshal(buf, &dataUsageInfo); err != nil {
		return DataUsageInfo{}, err
	}
	// For forward compatibility reasons, we need to add this code.
	if len(dataUsageInfo.BucketsUsage) == 0 {
		dataUsageInfo.BucketsUsage = make(map[string]BucketUsageInfo, len(dataUsageInfo.BucketSizes))

	t.Once.Do(func() {
		t.ttl = ttl
		t.updateFn = update
		t.opts = opts
	})
}

// Get will return a cached value or fetch a new one.
// Tf the Update function returns an error the value is forwarded as is and not cached.
func (t *Cache[T]) Get() (T, error) {
	v := t.valErr.Load()
	ttl := t.ttl
	vTime := t.lastUpdateMs.Load()
	tNow := time.Now().UnixMilli()
	if v != nil && tNow-vTime < ttl.Milliseconds() {