fix(platform): count dashboard frames from tdengine

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")
+}