diff --git a/modules/core/vehicle-identity/pom.xml b/modules/core/vehicle-identity/pom.xml
index 723d1a35..00cdf569 100644
--- a/modules/core/vehicle-identity/pom.xml
+++ b/modules/core/vehicle-identity/pom.xml
@@ -48,5 +48,10 @@
             <artifactId>spring-boot-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>
diff --git a/modules/core/vehicle-identity/src/test/java/com/lingniu/ingest/identity/MySqlVehicleIdentityServiceJdbcTest.java b/modules/core/vehicle-identity/src/test/java/com/lingniu/ingest/identity/MySqlVehicleIdentityServiceJdbcTest.java
new file mode 100644
index 00000000..04d2f4b9
--- /dev/null
+++ b/modules/core/vehicle-identity/src/test/java/com/lingniu/ingest/identity/MySqlVehicleIdentityServiceJdbcTest.java
@@ -0,0 +1,73 @@
+package com.lingniu.ingest.identity;
+
+import com.lingniu.ingest.api.ProtocolId;
+import org.h2.jdbcx.JdbcDataSource;
+import org.junit.jupiter.api.Test;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MySqlVehicleIdentityServiceJdbcTest {
+
+    @Test
+    void registrationVinWriteBackIsQueryableThroughRealJdbc() throws Exception {
+        JdbcDataSource dataSource = new JdbcDataSource();
+        dataSource.setURL("jdbc:h2:mem:" + UUID.randomUUID()
+                + ";MODE=MySQL;DATABASE_TO_UPPER=false;DB_CLOSE_DELAY=-1");
+
+        try (MySqlVehicleIdentityService service =
+                     new MySqlVehicleIdentityService(dataSource, "vehicle_identity_binding")) {
+            service.register(new VehicleRegistrationBinding(
+                    ProtocolId.JT808,
+                    "unknown",
+                    "13079961001",
+                    "dev61001",
+                    "粤B61001",
+                    44,
+                    4401,
+                    "maker-a",
+                    "type-a",
+                    1));
+
+            try (Connection connection = dataSource.getConnection();
+                 Statement statement = connection.createStatement()) {
+                ResultSet registered = statement.executeQuery("""
+                        SELECT vin, device_id, plate, province, city, maker, device_type, plate_color
+                        FROM vehicle_identity_binding_registration
+                        WHERE protocol = 'JT808' AND phone = '13079961001'
+                        """);
+                assertThat(registered.next()).isTrue();
+                assertThat(registered.getString("vin")).isEqualTo("unknown");
+                assertThat(registered.getString("device_id")).isEqualTo("DEV61001");
+                assertThat(registered.getString("plate")).isEqualTo("粤B61001");
+                assertThat(registered.getInt("province")).isEqualTo(44);
+                assertThat(registered.getInt("city")).isEqualTo(4401);
+                assertThat(registered.getString("maker")).isEqualTo("MAKER-A");
+                assertThat(registered.getString("device_type")).isEqualTo("TYPE-A");
+                assertThat(registered.getInt("plate_color")).isEqualTo(1);
+
+                statement.executeUpdate("""
+                        UPDATE vehicle_identity_binding_registration
+                        SET vin = 'LNVIN00000061001'
+                        WHERE protocol = 'JT808' AND phone = '13079961001'
+                        """);
+            }
+
+            service.refresh();
+
+            assertThat(service.resolve(new VehicleIdentityLookup(
+                    ProtocolId.JT808, "", "13079961001", "", "")).vin())
+                    .isEqualTo("LNVIN00000061001");
+            assertThat(service.resolve(new VehicleIdentityLookup(
+                    ProtocolId.JT808, "", "", "dev61001", "")).vin())
+                    .isEqualTo("LNVIN00000061001");
+            assertThat(service.resolve(new VehicleIdentityLookup(
+                    ProtocolId.JT808, "", "", "", "粤B61001")).vin())
+                    .isEqualTo("LNVIN00000061001");
+        }
+    }
+}
diff --git a/modules/services/event-history-service/src/main/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryController.java b/modules/services/event-history-service/src/main/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryController.java
index bcb23cbd..4e6c1304 100644
--- a/modules/services/event-history-service/src/main/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryController.java
+++ b/modules/services/event-history-service/src/main/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryController.java
@@ -22,6 +22,7 @@ import java.io.IOException;
 import java.time.Instant;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 
 @RestController
 @ConditionalOnProperty(prefix = "lingniu.ingest.event-history", name = "enabled", havingValue = "true")
@@ -30,6 +31,15 @@ import java.util.Locale;
 @Tag(name = "telemetry-field-history-controller", description = "遥测字段历史分页查询接口。")
 public final class TelemetryFieldHistoryController {
 
+    private static final Map<String, String> JT808_FIELD_ALIASES = Map.of(
+            "location.longitude", "longitude",
+            "location.latitude", "latitude",
+            "location.altitude_m", "altitude_m",
+            "location.speed_kmh", "speed_kmh",
+            "location.direction_deg", "direction_deg",
+            "location.alarm_flag", "location_alarm_flag",
+            "location.status_flag", "location_status_raw");
+
     private final TdengineHistoryReader reader;
 
     public TelemetryFieldHistoryController(TdengineHistoryReader reader) {
@@ -67,7 +77,9 @@ public final class TelemetryFieldHistoryController {
             @Parameter(description = "上一页返回的 nextCursor.id。", example = "event-xxx#0")
             @RequestParam(required = false) String cursorId) throws IOException {
         String normalizedProtocol = require(protocol, "protocol is required for telemetry field query").toUpperCase(Locale.ROOT);
-        String normalizedFieldKey = require(fieldKey, "fieldKey is required for telemetry field query");
+        String normalizedFieldKey = normalizeFieldKey(
+                normalizedProtocol,
+                require(fieldKey, "fieldKey is required for telemetry field query"));
         QueryTimeRange range = QueryTimeRange.parse(dateFrom, dateTo);
         TdenginePage<TdengineTelemetryFieldRow> page = reader.queryTelemetryFields(new TdengineTelemetryFieldQuery(
                 normalizedProtocol,
@@ -81,6 +93,13 @@ public final class TelemetryFieldHistoryController {
         return TelemetryFieldPageResponse.from(page);
     }
 
+    private static String normalizeFieldKey(String protocol, String fieldKey) {
+        if (!"JT808".equals(protocol)) {
+            return fieldKey;
+        }
+        return JT808_FIELD_ALIASES.getOrDefault(fieldKey, fieldKey);
+    }
+
     private static String resolveVehicleKey(String protocol, String vehicleKey, String vin, String phone) {
         String explicitVehicleKey = trimToNull(vehicleKey);
         if (explicitVehicleKey != null) {
diff --git a/modules/services/event-history-service/src/test/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryControllerTest.java b/modules/services/event-history-service/src/test/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryControllerTest.java
index c820a2c5..24213e2e 100644
--- a/modules/services/event-history-service/src/test/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryControllerTest.java
+++ b/modules/services/event-history-service/src/test/java/com/lingniu/ingest/eventhistory/TelemetryFieldHistoryControllerTest.java
@@ -78,6 +78,7 @@ class TelemetryFieldHistoryControllerTest {
                 null);
 
         assertThat(reader.query.vehicleKey()).isEqualTo("jt808:g7gps");
+        assertThat(reader.query.fieldKey()).isEqualTo("speed_kmh");
     }
 
     @Test