diff --git a/docs/architecture/storage-minimal-contract.md b/docs/architecture/storage-minimal-contract.md
index ca44d2f5..66554e0f 100644
--- a/docs/architecture/storage-minimal-contract.md
+++ b/docs/architecture/storage-minimal-contract.md
@@ -64,6 +64,7 @@
    - 索引：不在 `vehicle_realtime_location` 维护经纬度组合索引；实时表只回答当前态，地理范围和轨迹类查询走 TDengine 历史位置。
    - 查询：`/api/realtime/snapshots`、`/api/realtime/locations` 默认不执行 `COUNT(*)`，`total` 表示本页返回条数；只有需要精确总数时传 `includeTotal=true`。
    - 写入：车牌从 `vehicle_identity_binding` 按 VIN 主键直查，并使用 VIN 级短 TTL 内存缓存，避免实时帧每条都打 MySQL；缓存不作为事实来源。
+   - 不写 MySQL KV 投影表；实时全量字段保留在 Redis KV，历史全量字段走 TDengine raw fields。
    - 生产：项目上线前可直接重建这两张 MySQL 表，实时数据会从 Kafka 新消息继续投影。
 
 7. Redis realtime 只服务已定位 VIN 的正式车辆。
diff --git a/go/vehicle-gateway/cmd/realtime-api/main.go b/go/vehicle-gateway/cmd/realtime-api/main.go
index 0671ecea..62d10c19 100644
--- a/go/vehicle-gateway/cmd/realtime-api/main.go
+++ b/go/vehicle-gateway/cmd/realtime-api/main.go
@@ -115,7 +115,6 @@ func main() {
 		mux.Handle("/api/stats/daily-metrics", stats.NewMetricHandler(stats.NewMetricRepository(db)))
 		mux.Handle("/api/realtime/snapshots", realtime.NewSnapshotQueryHandler(realtime.NewSnapshotQueryRepository(db)))
 		mux.Handle("/api/realtime/locations", realtime.NewLocationQueryHandler(realtime.NewLocationQueryRepository(db)))
-		mux.Handle("/api/realtime/kv", realtime.NewKVQueryHandler(realtime.NewKVQueryRepository(db)))
 		logger.Info("stats mysql query enabled")
 	} else {
 		mysqlUnavailable := func(w http.ResponseWriter, _ *http.Request) {
@@ -126,7 +125,6 @@ func main() {
 		mux.HandleFunc("/api/stats/daily-metrics", mysqlUnavailable)
 		mux.HandleFunc("/api/realtime/snapshots", mysqlUnavailable)
 		mux.HandleFunc("/api/realtime/locations", mysqlUnavailable)
-		mux.HandleFunc("/api/realtime/kv", mysqlUnavailable)
 		logger.Warn("MYSQL_DSN is empty; stats query api disabled")
 	}
 	defer closeStats()
diff --git a/go/vehicle-gateway/cmd/realtime-api/main_test.go b/go/vehicle-gateway/cmd/realtime-api/main_test.go
index 7807505a..3466fe25 100644
--- a/go/vehicle-gateway/cmd/realtime-api/main_test.go
+++ b/go/vehicle-gateway/cmd/realtime-api/main_test.go
@@ -252,6 +252,16 @@ func TestRealtimeAPIExposesOperationalRealtimeRoutes(t *testing.T) {
 	}
 }
 
+func TestRealtimeAPIDoesNotExposeMySQLKVRoute(t *testing.T) {
+	source, err := os.ReadFile("main.go")
+	if err != nil {
+		t.Fatalf("read main.go: %v", err)
+	}
+	if strings.Contains(string(source), `"/api/realtime/kv"`) || strings.Contains(string(source), "NewKVQuery") {
+		t.Fatal("realtime api should not expose MySQL realtime kv route")
+	}
+}
+
 type contextCheckingRealtimeUpdater struct {
 	ctxErr error
 	count  int
diff --git a/go/vehicle-gateway/internal/realtime/mysql_query.go b/go/vehicle-gateway/internal/realtime/mysql_query.go
index 52db3acd..8a0c5845 100644
--- a/go/vehicle-gateway/internal/realtime/mysql_query.go
+++ b/go/vehicle-gateway/internal/realtime/mysql_query.go
@@ -19,8 +19,6 @@ type RealtimeTableQuery struct {
 	Protocol     string
 	VIN          string
 	Plate        string
-	Domain       string
-	Field        string
 	IncludeTotal bool
 	Limit        int
 	Offset       int
@@ -58,19 +56,6 @@ type LocationRow struct {
 	UpdatedAt      string   `json:"updated_at"`
 }
 
-type KVRow struct {
-	Protocol   string `json:"protocol"`
-	VIN        string `json:"vin"`
-	Domain     string `json:"domain"`
-	Field      string `json:"field"`
-	Value      string `json:"value"`
-	ValueType  string `json:"value_type"`
-	EventTime  string `json:"event_time,omitempty"`
-	ReceivedAt string `json:"received_at,omitempty"`
-	EventID    string `json:"event_id"`
-	UpdatedAt  string `json:"updated_at"`
-}
-
 type SnapshotQueryRepository struct {
 	db mysqlQueryer
 }
@@ -123,10 +108,6 @@ type LocationQueryRepository struct {
 	db mysqlQueryer
 }
 
-type KVQueryRepository struct {
-	db mysqlQueryer
-}
-
 func NewLocationQueryRepository(db mysqlQueryer) *LocationQueryRepository {
 	if db == nil {
 		panic("location query db must not be nil")
@@ -134,13 +115,6 @@ func NewLocationQueryRepository(db mysqlQueryer) *LocationQueryRepository {
 	return &LocationQueryRepository{db: db}
 }
 
-func NewKVQueryRepository(db mysqlQueryer) *KVQueryRepository {
-	if db == nil {
-		panic("kv query db must not be nil")
-	}
-	return &KVQueryRepository{db: db}
-}
-
 func (r *LocationQueryRepository) Count(ctx context.Context, query RealtimeTableQuery) (int64, error) {
 	sqlText, args := buildRealtimeCountSQL("vehicle_realtime_location", normalizeRealtimeTableQuery(query))
 	return queryCount(ctx, r.db, sqlText, args)
@@ -200,49 +174,6 @@ func (r *LocationQueryRepository) Query(ctx context.Context, query RealtimeTable
 	return out, rows.Err()
 }
 
-func (r *KVQueryRepository) Count(ctx context.Context, query RealtimeTableQuery) (int64, error) {
-	where, args := buildRealtimeKVWhere(normalizeRealtimeTableQuery(query))
-	sqlText := "SELECT COUNT(*) FROM vehicle_realtime_kv"
-	if len(where) > 0 {
-		sqlText += " WHERE " + strings.Join(where, " AND ")
-	}
-	return queryCount(ctx, r.db, sqlText, args)
-}
-
-func (r *KVQueryRepository) Query(ctx context.Context, query RealtimeTableQuery) ([]KVRow, error) {
-	query = normalizeRealtimeTableQuery(query)
-	where, args := buildRealtimeKVWhere(query)
-	sqlText := "SELECT protocol, vin, domain_name, field_name, field_value, value_type, event_time, received_at, event_id, updated_at FROM vehicle_realtime_kv"
-	if len(where) > 0 {
-		sqlText += " WHERE " + strings.Join(where, " AND ")
-	}
-	sqlText += " ORDER BY updated_at DESC LIMIT ? OFFSET ?"
-	args = append(args, query.Limit, query.Offset)
-	rows, err := r.db.QueryContext(ctx, sqlText, args...)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	out := make([]KVRow, 0)
-	for rows.Next() {
-		var row KVRow
-		var eventTime, receivedAt, updatedAt scanSQLDateTime
-		var value sql.NullString
-		if err := rows.Scan(&row.Protocol, &row.VIN, &row.Domain, &row.Field, &value, &row.ValueType, &eventTime, &receivedAt, &row.EventID, &updatedAt); err != nil {
-			return nil, err
-		}
-		if value.Valid {
-			row.Value = value.String
-		}
-		row.EventTime = eventTime.String
-		row.ReceivedAt = receivedAt.String
-		row.UpdatedAt = updatedAt.String
-		out = append(out, row)
-	}
-	return out, rows.Err()
-}
-
 type SnapshotQueryHandler struct {
 	repository *SnapshotQueryRepository
 }
@@ -291,10 +222,6 @@ type LocationQueryHandler struct {
 	repository *LocationQueryRepository
 }
 
-type KVQueryHandler struct {
-	repository *KVQueryRepository
-}
-
 func NewLocationQueryHandler(repository *LocationQueryRepository) *LocationQueryHandler {
 	if repository == nil {
 		panic("location query repository must not be nil")
@@ -302,13 +229,6 @@ func NewLocationQueryHandler(repository *LocationQueryRepository) *LocationQuery
 	return &LocationQueryHandler{repository: repository}
 }
 
-func NewKVQueryHandler(repository *KVQueryRepository) *KVQueryHandler {
-	if repository == nil {
-		panic("kv query repository must not be nil")
-	}
-	return &KVQueryHandler{repository: repository}
-}
-
 func (h *LocationQueryHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodGet {
 		writeError(w, http.StatusMethodNotAllowed, "method not allowed")
@@ -342,39 +262,6 @@ func (h *LocationQueryHandler) ServeHTTP(w http.ResponseWriter, r *http.Request)
 	writePage(w, rows, total, query)
 }
 
-func (h *KVQueryHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if r.Method != http.MethodGet {
-		writeError(w, http.StatusMethodNotAllowed, "method not allowed")
-		return
-	}
-	if strings.Trim(r.URL.Path, "/") != "api/realtime/kv" {
-		writeError(w, http.StatusNotFound, "route not found")
-		return
-	}
-	query, err := parseRealtimeTableQuery(r)
-	if err != nil {
-		writeError(w, http.StatusBadRequest, err.Error())
-		return
-	}
-	var total int64
-	if query.IncludeTotal {
-		total, err = h.repository.Count(r.Context(), query)
-		if err != nil {
-			writeError(w, http.StatusInternalServerError, err.Error())
-			return
-		}
-	}
-	rows, err := h.repository.Query(r.Context(), query)
-	if err != nil {
-		writeError(w, http.StatusInternalServerError, err.Error())
-		return
-	}
-	if !query.IncludeTotal {
-		total = int64(len(rows))
-	}
-	writePage(w, rows, total, query)
-}
-
 func parseRealtimeTableQuery(r *http.Request) (RealtimeTableQuery, error) {
 	values := r.URL.Query()
 	limit, err := parseRealtimeBoundedInt(values.Get("limit"), 50, 1, 1000, "limit")
@@ -389,8 +276,6 @@ func parseRealtimeTableQuery(r *http.Request) (RealtimeTableQuery, error) {
 		Protocol:     values.Get("protocol"),
 		VIN:          values.Get("vin"),
 		Plate:        values.Get("plate"),
-		Domain:       values.Get("domain"),
-		Field:        values.Get("field"),
 		IncludeTotal: strings.EqualFold(strings.TrimSpace(values.Get("includeTotal")), "true"),
 		Limit:        limit,
 		Offset:       offset,
@@ -401,36 +286,12 @@ func normalizeRealtimeTableQuery(query RealtimeTableQuery) RealtimeTableQuery {
 	query.Protocol = strings.ToUpper(strings.TrimSpace(query.Protocol))
 	query.VIN = strings.TrimSpace(query.VIN)
 	query.Plate = strings.TrimSpace(query.Plate)
-	query.Domain = strings.TrimSpace(query.Domain)
-	query.Field = strings.TrimSpace(query.Field)
 	if query.Limit <= 0 {
 		query.Limit = 50
 	}
 	return query
 }
 
-func buildRealtimeKVWhere(query RealtimeTableQuery) ([]string, []any) {
-	var where []string
-	var args []any
-	if query.Protocol != "" {
-		where = append(where, "protocol = ?")
-		args = append(args, query.Protocol)
-	}
-	if query.VIN != "" {
-		where = append(where, "vin = ?")
-		args = append(args, query.VIN)
-	}
-	if query.Domain != "" {
-		where = append(where, "domain_name = ?")
-		args = append(args, query.Domain)
-	}
-	if query.Field != "" {
-		where = append(where, "field_name = ?")
-		args = append(args, query.Field)
-	}
-	return where, args
-}
-
 func buildRealtimeCountSQL(table string, query RealtimeTableQuery) (string, []any) {
 	where, args := buildRealtimeWhere(query)
 	sqlText := "SELECT COUNT(*) FROM " + table
diff --git a/go/vehicle-gateway/internal/realtime/mysql_query_test.go b/go/vehicle-gateway/internal/realtime/mysql_query_test.go
index 8f0ca4f3..17d5adbe 100644
--- a/go/vehicle-gateway/internal/realtime/mysql_query_test.go
+++ b/go/vehicle-gateway/internal/realtime/mysql_query_test.go
@@ -94,44 +94,6 @@ func TestLocationQueryHandlerReturnsRealtimeLocations(t *testing.T) {
 	}
 }
 
-func TestKVQueryHandlerReturnsRealtimeKVFields(t *testing.T) {
-	db, mock, err := sqlmock.New()
-	if err != nil {
-		t.Fatalf("sqlmock.New() error = %v", err)
-	}
-	defer db.Close()
-
-	mock.ExpectQuery("SELECT COUNT\\(\\*\\) FROM vehicle_realtime_kv").
-		WithArgs("GB32960", "VIN001", "gd_fc_stack", "stack_water_outlet_temp_c").
-		WillReturnRows(sqlmock.NewRows([]string{"total"}).AddRow(1))
-	mock.ExpectQuery("SELECT protocol, vin, domain_name, field_name, field_value, value_type, event_time, received_at, event_id, updated_at FROM vehicle_realtime_kv").
-		WithArgs("GB32960", "VIN001", "gd_fc_stack", "stack_water_outlet_temp_c", 10, 0).
-		WillReturnRows(sqlmock.NewRows([]string{
-			"protocol", "vin", "domain_name", "field_name", "field_value", "value_type", "event_time", "received_at", "event_id", "updated_at",
-		}).AddRow(
-			"GB32960", "VIN001", "gd_fc_stack", "stack_water_outlet_temp_c", "63", "number", "2026-07-03 11:18:45.000", "2026-07-03 11:18:45.123", "evt-kv", "2026-07-03 11:18:46",
-		))
-
-	handler := NewKVQueryHandler(NewKVQueryRepository(db))
-	request := httptest.NewRequest(http.MethodGet, "/api/realtime/kv?protocol=gb32960&vin=VIN001&domain=gd_fc_stack&field=stack_water_outlet_temp_c&includeTotal=true&limit=10", nil)
-	response := httptest.NewRecorder()
-
-	handler.ServeHTTP(response, request)
-
-	if response.Code != http.StatusOK {
-		t.Fatalf("status = %d body=%s", response.Code, response.Body.String())
-	}
-	body := response.Body.String()
-	for _, want := range []string{`"protocol":"GB32960"`, `"domain":"gd_fc_stack"`, `"field":"stack_water_outlet_temp_c"`, `"value":"63"`, `"value_type":"number"`, `"total":1`} {
-		if !strings.Contains(body, want) {
-			t.Fatalf("response missing %s: %s", want, body)
-		}
-	}
-	if err := mock.ExpectationsWereMet(); err != nil {
-		t.Fatalf("sql expectations: %v", err)
-	}
-}
-
 func TestSnapshotQueryHandlerSkipsTotalCountByDefault(t *testing.T) {
 	db, mock, err := sqlmock.New()
 	if err != nil {
diff --git a/go/vehicle-gateway/internal/realtime/openapi.go b/go/vehicle-gateway/internal/realtime/openapi.go
index 9457606d..f10c6b54 100644
--- a/go/vehicle-gateway/internal/realtime/openapi.go
+++ b/go/vehicle-gateway/internal/realtime/openapi.go
@@ -38,7 +38,7 @@ func realtimeOpenAPISpec() map[string]any {
 		"info": map[string]any{
 			"title":       "Lingniu Vehicle Realtime API",
 			"version":     "1.0.0",
-			"description": "MySQL realtime query APIs for vehicle_realtime_snapshot, vehicle_realtime_location, and vehicle_realtime_kv.",
+			"description": "MySQL realtime query APIs for vehicle_realtime_snapshot and vehicle_realtime_location.",
 		},
 		"paths": map[string]any{
 			"/api/realtime/snapshots": map[string]any{
@@ -79,31 +79,11 @@ func realtimeOpenAPISpec() map[string]any {
 					},
 				},
 			},
-			"/api/realtime/kv": map[string]any{
-				"get": map[string]any{
-					"summary":     "查询车辆实时 KV 字段",
-					"description": "从 vehicle_realtime_kv 查询实时字段投影，支持协议、VIN、domain、field 过滤和分页。适合 UI 局部刷新、快速字段查询和统计输入。",
-					"tags":        []string{"Realtime KV API"},
-					"x-table":     "vehicle_realtime_kv",
-					"parameters":  kvRealtimeParameters(),
-					"responses": map[string]any{
-						"200": map[string]any{
-							"description": "KV page",
-							"content": map[string]any{
-								"application/json": map[string]any{
-									"schema": map[string]any{"$ref": "#/components/schemas/KVPage"},
-								},
-							},
-						},
-					},
-				},
-			},
 		},
 		"components": map[string]any{
 			"schemas": map[string]any{
 				"SnapshotPage": pageSchema("#/components/schemas/SnapshotRow"),
 				"LocationPage": pageSchema("#/components/schemas/LocationRow"),
-				"KVPage":       pageSchema("#/components/schemas/KVRow"),
 				"SnapshotRow": map[string]any{
 					"type": "object",
 					"properties": map[string]any{
@@ -137,35 +117,11 @@ func realtimeOpenAPISpec() map[string]any {
 						"updated_at":       stringSchema("2026-07-02 16:11:04"),
 					},
 				},
-				"KVRow": map[string]any{
-					"type": "object",
-					"properties": map[string]any{
-						"protocol":    stringSchema("GB32960"),
-						"vin":         stringSchema("LNXNEGRR0SR321372"),
-						"domain":      stringSchema("gd_fc_stack"),
-						"field":       stringSchema("stack_water_outlet_temp_c"),
-						"value":       stringSchema("63"),
-						"value_type":  stringSchema("number"),
-						"event_time":  stringSchema("2026-07-03 11:18:45.000"),
-						"received_at": stringSchema("2026-07-03 11:18:45.123"),
-						"event_id":    stringSchema("event id"),
-						"updated_at":  stringSchema("2026-07-03 11:18:46"),
-					},
-				},
 			},
 		},
 	}
 }
 
-func kvRealtimeParameters() []map[string]any {
-	params := commonRealtimeParameters()
-	params = append(params,
-		map[string]any{"name": "domain", "in": "query", "schema": map[string]any{"type": "string", "example": "gd_fc_stack"}, "required": false},
-		map[string]any{"name": "field", "in": "query", "schema": map[string]any{"type": "string", "example": "stack_water_outlet_temp_c"}, "required": false},
-	)
-	return params
-}
-
 func commonRealtimeParameters() []map[string]any {
 	return []map[string]any{
 		{"name": "protocol", "in": "query", "schema": map[string]any{"type": "string", "enum": []string{"GB32960", "JT808", "YUTONG_MQTT"}}, "required": false},
diff --git a/go/vehicle-gateway/internal/realtime/openapi_test.go b/go/vehicle-gateway/internal/realtime/openapi_test.go
index a9960e86..e86cebd3 100644
--- a/go/vehicle-gateway/internal/realtime/openapi_test.go
+++ b/go/vehicle-gateway/internal/realtime/openapi_test.go
@@ -22,6 +22,11 @@ func TestOpenAPIHandlerDocumentsRealtimeSnapshotAndLocation(t *testing.T) {
 			t.Fatalf("openapi missing %s: %s", want, body)
 		}
 	}
+	for _, removed := range []string{`"/api/realtime/kv"`, `"vehicle_realtime_kv"`, `"Realtime KV API"`} {
+		if strings.Contains(body, removed) {
+			t.Fatalf("openapi should not expose removed MySQL realtime kv API %s: %s", removed, body)
+		}
+	}
 	for _, want := range []string{`"includeTotal"`, `默认不执行 COUNT(*)`, `total 默认表示本页返回条数`} {
 		if !strings.Contains(body, want) {
 			t.Fatalf("openapi should document lightweight total semantics, missing %s: %s", want, body)
diff --git a/go/vehicle-gateway/internal/realtime/snapshot_writer.go b/go/vehicle-gateway/internal/realtime/snapshot_writer.go
index 57d8c411..a4a82943 100644
--- a/go/vehicle-gateway/internal/realtime/snapshot_writer.go
+++ b/go/vehicle-gateway/internal/realtime/snapshot_writer.go
@@ -111,9 +111,6 @@ func (w *SnapshotWriter) EnsureSchema(ctx context.Context) error {
 	if _, err := w.exec.ExecContext(ctx, realtimeLocationTableSQL); err != nil {
 		return err
 	}
-	if _, err := w.exec.ExecContext(ctx, realtimeKVTableSQL); err != nil {
-		return err
-	}
 	return nil
 }
 
@@ -152,9 +149,6 @@ func (w *SnapshotWriter) Update(ctx context.Context, env envelope.FrameEnvelope)
 	); err != nil {
 		return err
 	}
-	if err := w.upsertKV(ctx, env, parsed); err != nil {
-		return err
-	}
 	location, ok := realtimeLocationFromEnvelope(env, vin, plate)
 	if !ok {
 		return nil
@@ -196,31 +190,6 @@ func (w *SnapshotWriter) parsedForEnvelope(ctx context.Context, env envelope.Fra
 	return parsed, nil
 }
 
-func (w *SnapshotWriter) upsertKV(ctx context.Context, env envelope.FrameEnvelope, parsed map[string]any) error {
-	rows := realtimeKVFields(env, parsed)
-	if len(rows) == 0 {
-		return nil
-	}
-	placeholders := make([]string, 0, len(rows))
-	args := make([]any, 0, len(rows)*9)
-	for _, row := range rows {
-		placeholders = append(placeholders, "(?, ?, ?, ?, ?, ?, ?, ?, ?)")
-		args = append(args,
-			string(row.Protocol),
-			row.VIN,
-			row.Domain,
-			row.Field,
-			row.Value,
-			row.ValueType,
-			nullableTime(row.EventTimeMS),
-			nullableTime(row.ReceivedAtMS),
-			row.EventID,
-		)
-	}
-	_, err := w.exec.ExecContext(ctx, upsertRealtimeKVSQLPrefix+strings.Join(placeholders, ",")+upsertRealtimeKVSQLSuffix, args...)
-	return err
-}
-
 func platformNameFromEnvelope(env envelope.FrameEnvelope) string {
 	if env.Fields != nil {
 		if value := strings.TrimSpace(stringValue(env.Fields["platform_account"])); value != "" {
@@ -533,37 +502,6 @@ const realtimeLocationTableSQL = `CREATE TABLE IF NOT EXISTS vehicle_realtime_lo
   KEY idx_protocol_updated (protocol, updated_at)
 )`
 
-const realtimeKVTableSQL = `CREATE TABLE IF NOT EXISTS vehicle_realtime_kv (
-  protocol VARCHAR(32) NOT NULL,
-  vin VARCHAR(32) NOT NULL,
-  domain_name VARCHAR(64) NOT NULL,
-  field_name VARCHAR(160) NOT NULL,
-  field_value TEXT NULL,
-  value_type VARCHAR(16) NOT NULL DEFAULT '',
-  event_time DATETIME(3) NULL,
-  received_at DATETIME(3) NULL,
-  event_id VARCHAR(64) NOT NULL DEFAULT '',
-  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
-  PRIMARY KEY (protocol, vin, domain_name, field_name),
-  KEY idx_vin_domain (vin, domain_name),
-  KEY idx_protocol_domain (protocol, domain_name)
-)`
-
-const upsertRealtimeKVSQLPrefix = `
-INSERT INTO vehicle_realtime_kv
-  (protocol, vin, domain_name, field_name, field_value, value_type, event_time, received_at, event_id)
-VALUES `
-
-const upsertRealtimeKVSQLSuffix = `
-ON DUPLICATE KEY UPDATE
-  field_value = IF(VALUES(event_time) IS NOT NULL AND (vehicle_realtime_kv.event_time IS NULL OR VALUES(event_time) >= vehicle_realtime_kv.event_time), VALUES(field_value), field_value),
-  value_type = IF(VALUES(event_time) IS NOT NULL AND (vehicle_realtime_kv.event_time IS NULL OR VALUES(event_time) >= vehicle_realtime_kv.event_time), VALUES(value_type), value_type),
-  event_time = IF(VALUES(event_time) IS NOT NULL AND (vehicle_realtime_kv.event_time IS NULL OR VALUES(event_time) >= vehicle_realtime_kv.event_time), VALUES(event_time), event_time),
-  received_at = IF(VALUES(event_time) IS NOT NULL AND (vehicle_realtime_kv.event_time IS NULL OR VALUES(event_time) >= vehicle_realtime_kv.event_time), VALUES(received_at), received_at),
-  event_id = IF(VALUES(event_time) IS NOT NULL AND (vehicle_realtime_kv.event_time IS NULL OR VALUES(event_time) >= vehicle_realtime_kv.event_time), VALUES(event_id), event_id),
-  updated_at = IF(VALUES(event_time) IS NOT NULL AND (vehicle_realtime_kv.event_time IS NULL OR VALUES(event_time) >= vehicle_realtime_kv.event_time), CURRENT_TIMESTAMP, updated_at)
-`
-
 const upsertRealtimeLocationSQL = `
 INSERT INTO vehicle_realtime_location
   (protocol, vin, plate, event_time, latitude, longitude, speed_kmh, total_mileage_km,
diff --git a/go/vehicle-gateway/internal/realtime/snapshot_writer_test.go b/go/vehicle-gateway/internal/realtime/snapshot_writer_test.go
index 3a898c87..595438f9 100644
--- a/go/vehicle-gateway/internal/realtime/snapshot_writer_test.go
+++ b/go/vehicle-gateway/internal/realtime/snapshot_writer_test.go
@@ -42,8 +42,8 @@ func TestSnapshotWriterEnsuresSchemaAndUpsertsCoreSnapshot(t *testing.T) {
 		t.Fatalf("Update() error = %v", err)
 	}
 
-	if len(exec.calls) != 8 {
-		t.Fatalf("exec calls = %d, want 8", len(exec.calls))
+	if len(exec.calls) != 6 {
+		t.Fatalf("exec calls = %d, want 6", len(exec.calls))
 	}
 	if !strings.Contains(exec.calls[0].query, "CREATE TABLE IF NOT EXISTS vehicle_realtime_snapshot") {
 		t.Fatalf("schema query = %s", exec.calls[0].query)
@@ -51,8 +51,10 @@ func TestSnapshotWriterEnsuresSchemaAndUpsertsCoreSnapshot(t *testing.T) {
 	if !strings.Contains(exec.calls[4].query, "CREATE TABLE IF NOT EXISTS vehicle_realtime_location") {
 		t.Fatalf("location schema query = %s", exec.calls[4].query)
 	}
-	if !strings.Contains(exec.calls[5].query, "CREATE TABLE IF NOT EXISTS vehicle_realtime_kv") {
-		t.Fatalf("kv schema query = %s", exec.calls[5].query)
+	for _, call := range exec.calls {
+		if strings.Contains(call.query, "vehicle_realtime_kv") {
+			t.Fatalf("snapshot writer should not create or write MySQL realtime kv: %s", call.query)
+		}
 	}
 	for _, call := range []snapshotExecCall{exec.calls[0], exec.calls[4]} {
 		if strings.Contains(call.query, "fields_json") {
@@ -75,7 +77,7 @@ func TestSnapshotWriterEnsuresSchemaAndUpsertsCoreSnapshot(t *testing.T) {
 	if strings.Contains(exec.calls[4].query, "idx_location") {
 		t.Fatalf("realtime location table should not keep unused geo index: %s", exec.calls[4].query)
 	}
-	upsert := exec.calls[6]
+	upsert := exec.calls[5]
 	if !strings.Contains(upsert.query, "ON DUPLICATE KEY UPDATE") {
 		t.Fatalf("upsert query = %s", upsert.query)
 	}
@@ -102,10 +104,6 @@ func TestSnapshotWriterEnsuresSchemaAndUpsertsCoreSnapshot(t *testing.T) {
 	if len(upsert.args) != 9 {
 		t.Fatalf("snapshot upsert args = %d, want 9", len(upsert.args))
 	}
-	kvUpsert := exec.calls[7]
-	if !strings.Contains(kvUpsert.query, "INSERT INTO vehicle_realtime_kv") || !strings.Contains(kvUpsert.query, "ON DUPLICATE KEY UPDATE") {
-		t.Fatalf("kv upsert query = %s", kvUpsert.query)
-	}
 }
 
 func TestSnapshotWriterEnsureSchemaOnlyCreatesTargetTables(t *testing.T) {
@@ -126,8 +124,6 @@ func TestSnapshotWriterEnsureSchemaOnlyCreatesTargetTables(t *testing.T) {
 		WillReturnResult(sqlmock.NewResult(0, 0))
 	mock.ExpectExec("CREATE TABLE IF NOT EXISTS vehicle_realtime_location").
 		WillReturnResult(sqlmock.NewResult(0, 0))
-	mock.ExpectExec("CREATE TABLE IF NOT EXISTS vehicle_realtime_kv").
-		WillReturnResult(sqlmock.NewResult(0, 0))
 
 	if err := writer.EnsureSchema(context.Background()); err != nil {
 		t.Fatalf("EnsureSchema() error = %v", err)
@@ -169,10 +165,10 @@ func TestSnapshotWriterUpsertsRealtimeLocationWhenCoordinatesExist(t *testing.T)
 		t.Fatalf("Update() error = %v", err)
 	}
 
-	if len(exec.calls) != 3 {
-		t.Fatalf("exec calls = %d, want 3", len(exec.calls))
+	if len(exec.calls) != 2 {
+		t.Fatalf("exec calls = %d, want 2", len(exec.calls))
 	}
-	locationUpsert := exec.calls[2]
+	locationUpsert := exec.calls[1]
 	if !strings.Contains(locationUpsert.query, "INSERT INTO vehicle_realtime_location") {
 		t.Fatalf("location upsert query = %s", locationUpsert.query)
 	}
@@ -235,8 +231,6 @@ func TestSnapshotWriterMergesGB32960ParsedJSONAcrossSplitRealtimeFrames(t *testi
 			sqlmock.AnyArg(),
 		).
 		WillReturnResult(sqlmock.NewResult(0, 1))
-	mock.ExpectExec("INSERT INTO vehicle_realtime_kv").
-		WillReturnResult(sqlmock.NewResult(0, 2))
 
 	err = writer.Update(context.Background(), envelope.FrameEnvelope{
 		Protocol:     envelope.ProtocolGB32960,
@@ -283,8 +277,6 @@ func TestSnapshotWriterCollapsesGB32960StackFragmentsWhenMergingParsedJSON(t *te
 			sqlmock.AnyArg(),
 		).
 		WillReturnResult(sqlmock.NewResult(0, 1))
-	mock.ExpectExec("INSERT INTO vehicle_realtime_kv").
-		WillReturnResult(sqlmock.NewResult(0, 3))
 
 	err = writer.Update(context.Background(), envelope.FrameEnvelope{
 		Protocol:     envelope.ProtocolGB32960,
@@ -379,13 +371,13 @@ func TestSnapshotWriterBackfillsPlateFromBindingByVIN(t *testing.T) {
 	if resolver.vin != "VIN001" {
 		t.Fatalf("resolver vin = %q", resolver.vin)
 	}
-	if len(exec.calls) != 3 {
-		t.Fatalf("exec calls = %d, want 3", len(exec.calls))
+	if len(exec.calls) != 2 {
+		t.Fatalf("exec calls = %d, want 2", len(exec.calls))
 	}
 	if got, want := exec.calls[0].args[2], "沪A12345"; got != want {
 		t.Fatalf("snapshot plate arg = %#v, want %q", got, want)
 	}
-	if got, want := exec.calls[2].args[2], "沪A12345"; got != want {
+	if got, want := exec.calls[1].args[2], "沪A12345"; got != want {
 		t.Fatalf("location plate arg = %#v, want %q", got, want)
 	}
 }
@@ -441,10 +433,10 @@ func TestSnapshotWriterCachesBindingPlateByVIN(t *testing.T) {
 	if resolver.calls != 1 {
 		t.Fatalf("plate resolver calls = %d, want 1", resolver.calls)
 	}
-	if len(exec.calls) != 6 {
-		t.Fatalf("exec calls = %d, want 6", len(exec.calls))
+	if len(exec.calls) != 4 {
+		t.Fatalf("exec calls = %d, want 4", len(exec.calls))
 	}
-	for _, index := range []int{0, 3} {
+	for _, index := range []int{0, 2} {
 		if got, want := exec.calls[index].args[2], "沪A12345"; got != want {
 			t.Fatalf("snapshot %d plate arg = %#v, want %q", index, got, want)
 		}