fix(platform): count dashboard frames from tdengine

vehicle-data-platform/apps/api/internal/platform/production_store.go

@@ -50,7 +50,11 @@ func (s *ProductionStore) DashboardSummary(ctx context.Context) (DashboardSummar
 	if err := s.db.QueryRowContext(ctx, `SELECT COUNT(*) FROM jt808_registration r LEFT JOIN vehicle_identity_binding b ON b.phone = r.phone WHERE r.vin = '' OR r.vin = 'unknown' OR r.vin IS NULL`).Scan(&summary.IssueVehicles); err != nil {
 		return DashboardSummary{}, err
 	}
-	summary.FrameToday = summary.ActiveToday
+	frameToday, err := s.frameToday(ctx, time.Now())
+	if err != nil {
+		return DashboardSummary{}, err
+	}
+	summary.FrameToday = frameToday
 	protocols, err := s.protocolStats(ctx)
 	if err != nil {
 		return DashboardSummary{}, err
@@ -65,6 +69,18 @@ func (s *ProductionStore) DashboardSummary(ctx context.Context) (DashboardSummar
 	return summary, nil
 }
 
+func (s *ProductionStore) frameToday(ctx context.Context, now time.Time) (int, error) {
+	if s.tdengine == nil {
+		return 0, nil
+	}
+	built := buildTodayRawFrameCountSQL(s.tdDatabase, now)
+	total := 0
+	if err := s.tdengine.QueryRowContext(ctx, built.Text).Scan(&total); err != nil {
+		return 0, err
+	}
+	return total, nil
+}
+
 func (s *ProductionStore) Vehicles(ctx context.Context, query url.Values) (Page[VehicleRow], error) {
 	built := buildVehicleListSQL(query)
 	total := 0

vehicle-data-platform/apps/api/internal/platform/query_builders_test.go

@@ -4,6 +4,7 @@ import (
 	"net/url"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestBuildVehicleListSQL(t *testing.T) {
@@ -120,3 +121,13 @@ func TestBuildHistoryLocationSQL(t *testing.T) {
 		t.Fatalf("SQL should keep stable pagination order: %s", built.Text)
 	}
 }
+
+func TestBuildTodayRawFrameCountSQL(t *testing.T) {
+	now := time.Date(2026, 7, 3, 22, 30, 0, 0, time.FixedZone("Asia/Shanghai", 8*3600))
+	built := buildTodayRawFrameCountSQL("lingniu_vehicle_ts", now)
+	for _, want := range []string{"SELECT COUNT(*)", "lingniu_vehicle_ts.raw_frames", "ts >= '2026-07-02 16:00:00'"} {
+		if !strings.Contains(built.Text, want) {
+			t.Fatalf("SQL missing %q: %s", want, built.Text)
+		}
+	}
+}

vehicle-data-platform/apps/api/internal/platform/tdengine_queries.go

@@ -83,6 +83,13 @@ func buildHistoryLocationSQL(database string, query map[string]string) SQLQuery
 	return SQLQuery{Text: text, Args: args, CountText: countText}
 }
 
+func buildTodayRawFrameCountSQL(database string, now time.Time) SQLQuery {
+	start := shanghaiDayStartUTC(now)
+	return SQLQuery{
+		Text: `SELECT COUNT(*) FROM ` + qualifyTDengine(database, "raw_frames") + ` WHERE ts >= '` + quoteTDengine(start) + `'`,
+	}
+}
+
 func qualifyTDengine(database, table string) string {
 	if strings.TrimSpace(database) == "" {
 		return table
@@ -136,3 +143,10 @@ func normalizeTDengineTime(value string) string {
 	}
 	return value
 }
+
+func shanghaiDayStartUTC(now time.Time) string {
+	shanghai := time.FixedZone("Asia/Shanghai", 8*3600)
+	local := now.In(shanghai)
+	start := time.Date(local.Year(), local.Month(), local.Day(), 0, 0, 0, 0, shanghai)
+	return start.UTC().Format("2006-01-02 15:04:05")
+}