feat(platform): harden telemetry pipeline and unify Semi UI workspaces

go/vehicle-gateway/internal/stats/daily_metric.go

@@ -18,6 +18,7 @@ const (
 	defaultCacheRetention       = 72 * time.Hour
 	defaultCacheCleanupInterval = 10 * time.Minute
 	defaultBaselineMissTTL      = time.Minute
+	defaultBaselineHitTTL       = 5 * time.Minute
 	defaultMaxCacheEntries      = 1000000
 )
 
@@ -34,6 +35,7 @@ type Writer struct {
 	cacheRetention         time.Duration
 	cacheCleanupInterval   time.Duration
 	baselineMissTTL        time.Duration
+	baselineHitTTL         time.Duration
 	maxCacheEntries        int
 	lastCacheCleanup       time.Time
 	lastCacheCleanupStats  cacheCleanupStats
@@ -122,6 +124,7 @@ func NewWriter(exec Execer, loc *time.Location) *Writer {
 		cacheRetention:         defaultCacheRetention,
 		cacheCleanupInterval:   defaultCacheCleanupInterval,
 		baselineMissTTL:        defaultBaselineMissTTL,
+		baselineHitTTL:         defaultBaselineHitTTL,
 		maxCacheEntries:        defaultMaxCacheEntries,
 		lastTotalMileage:       map[string]float64{},
 		lastSourceSeen:         map[string]time.Time{},
@@ -182,6 +185,15 @@ func (w *Writer) SetBaselineMissTTL(ttl time.Duration) {
 	w.baselineMissTTL = ttl
 }
 
+func (w *Writer) SetBaselineHitTTL(ttl time.Duration) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if ttl < 0 {
+		ttl = 0
+	}
+	w.baselineHitTTL = ttl
+}
+
 func (w *Writer) SetMaxCacheEntries(maxEntries int) {
 	w.mu.Lock()
 	defer w.mu.Unlock()
@@ -517,8 +529,12 @@ func (w *Writer) previousBaseline(ctx context.Context, candidate SourceMileageSa
 	now := time.Now()
 	w.mu.Lock()
 	if cached, ok := w.baselineCache[cacheKey]; ok {
-		missExpired := !cached.found && (w.baselineMissTTL == 0 || cached.cachedAt.IsZero() || now.Sub(cached.cachedAt) >= w.baselineMissTTL)
-		if !missExpired {
+		ttl := w.baselineMissTTL
+		if cached.found {
+			ttl = w.baselineHitTTL
+		}
+		expired := ttl == 0 || cached.cachedAt.IsZero() || now.Sub(cached.cachedAt) >= ttl
+		if !expired {
 			w.mu.Unlock()
 			return cached.baseline, cached.found, nil
 		}
@@ -570,6 +586,16 @@ func (w *Writer) cacheBaseline(candidate SourceMileageSample, cacheKey string, e
 		return
 	}
 	w.mu.Lock()
+	if previous, ok := w.baselineCache[cacheKey]; ok &&
+		previous.found && entry.found &&
+		previous.baseline.LatestTotalKM == entry.baseline.LatestTotalKM &&
+		previous.baseline.LatestEventTime.Equal(entry.baseline.LatestEventTime) &&
+		!previous.cachedAt.IsZero() {
+		// markBaselineWritten runs for every accepted sample. Preserve the
+		// original cache age when the durable day-boundary baseline has not
+		// changed, otherwise an active vehicle would keep stale history forever.
+		entry.cachedAt = previous.cachedAt
+	}
 	if entry.cachedAt.IsZero() {
 		entry.cachedAt = time.Now()
 	}