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

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

@@ -1091,6 +1091,91 @@ func TestWriterRetriesExpiredMissingPreviousDayBaseline(t *testing.T) {
 	}
 }
 
+func TestWriterRefreshesExpiredFoundPreviousDayBaseline(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	if err != nil {
+		t.Fatalf("sqlmock.New() error = %v", err)
+	}
+	defer db.Close()
+
+	loc := time.FixedZone("Asia/Shanghai", 8*3600)
+	writer := NewWriter(db, loc)
+	writer.SetBaselineHitTTL(time.Minute)
+	candidate := SourceMileageSample{
+		VIN:       "LMRKH9AC6R1004111",
+		StatDate:  "2026-07-17",
+		Protocol:  envelope.ProtocolYutongMQTT,
+		SourceKey: "YUTONG_MQTT:LMRKH9AC6R1004111@PLATFORM:yutong",
+	}
+	cacheKey := mileageCacheKey(MetricSample{
+		VIN:       candidate.VIN,
+		Protocol:  candidate.Protocol,
+		StatDate:  candidate.StatDate,
+		SourceKey: candidate.SourceKey,
+	})
+	staleTime := time.Date(2026, 7, 12, 4, 12, 20, 0, loc)
+	writer.baselineCache[cacheKey] = sourceBaselineCacheEntry{
+		baseline: sourceBaseline{LatestTotalKM: 90778, LatestEventTime: staleTime},
+		found:    true,
+		cachedAt: time.Now().Add(-2 * time.Minute),
+	}
+
+	refreshedTime := time.Date(2026, 7, 16, 23, 59, 59, 0, loc)
+	mock.ExpectQuery(`SELECT latest_total_mileage_km, latest_event_time FROM vehicle_daily_mileage_source`).
+		WithArgs(candidate.VIN, candidate.StatDate, "YUTONG_MQTT", candidate.SourceKey).
+		WillReturnRows(sqlmock.NewRows([]string{"latest_total_mileage_km", "latest_event_time"}).
+			AddRow(91302.0, refreshedTime))
+
+	baseline, found, err := writer.previousBaseline(context.Background(), candidate)
+	if err != nil || !found {
+		t.Fatalf("previousBaseline() found=%v error=%v, want refreshed baseline", found, err)
+	}
+	if baseline.LatestTotalKM != 91302 || !baseline.LatestEventTime.Equal(refreshedTime) {
+		t.Fatalf("baseline = %+v, want nearest refreshed baseline", baseline)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("sql expectations: %v", err)
+	}
+}
+
+func TestWriterMarkBaselineKeepsCacheAgeForUnchangedBoundary(t *testing.T) {
+	db, _, err := sqlmock.New()
+	if err != nil {
+		t.Fatalf("sqlmock.New() error = %v", err)
+	}
+	defer db.Close()
+
+	loc := time.FixedZone("Asia/Shanghai", 8*3600)
+	writer := NewWriter(db, loc)
+	candidate := SourceMileageSample{
+		VIN:            "LMRKH9AC6R1004111",
+		StatDate:       "2026-07-17",
+		Protocol:       envelope.ProtocolYutongMQTT,
+		SourceKey:      "YUTONG_MQTT:LMRKH9AC6R1004111@PLATFORM:yutong",
+		FirstTotalKM:   91302,
+		FirstEventTime: time.Date(2026, 7, 16, 23, 59, 59, 0, loc),
+	}
+	sample := MetricSample{
+		VIN:       candidate.VIN,
+		Protocol:  candidate.Protocol,
+		StatDate:  candidate.StatDate,
+		SourceKey: candidate.SourceKey,
+	}
+	cacheKey := mileageCacheKey(sample)
+	cachedAt := time.Now().Add(-4 * time.Minute)
+	writer.baselineCache[cacheKey] = sourceBaselineCacheEntry{
+		baseline: sourceBaseline{LatestTotalKM: candidate.FirstTotalKM, LatestEventTime: candidate.FirstEventTime},
+		found:    true,
+		cachedAt: cachedAt,
+	}
+
+	writer.markBaselineWritten(sample, candidate)
+
+	if got := writer.baselineCache[cacheKey].cachedAt; !got.Equal(cachedAt) {
+		t.Fatalf("cachedAt = %s, want unchanged %s", got, cachedAt)
+	}
+}
+
 func TestWriterAppendUsesPreviousSourceBaselineForRealtimeCandidate(t *testing.T) {
 	db, mock, err := sqlmock.New()
 	if err != nil {