feat: add jt808 streaming daily mileage

2026-06-30 17:02:54 +08:00
parent e47e341034
commit 3cc7ac9669
27 changed files with 2109 additions and 6 deletions
--- a/deploy/portainer/docker-compose.yml
+++ b/deploy/portainer/docker-compose.yml
@@ -235,6 +235,16 @@ services:
      VEHICLE_STAT_ENABLED: ${VEHICLE_STAT_ENABLED:-true}
      VEHICLE_STAT_FILE_PATH: /vehicle-stat/
      VEHICLE_STAT_ZONE_ID: ${VEHICLE_STAT_ZONE_ID:-Asia/Shanghai}
+      VEHICLE_STAT_JT808_MILEAGE_ENABLED: ${VEHICLE_STAT_JT808_MILEAGE_ENABLED:-true}
+      VEHICLE_STAT_JT808_STATE_STORE: ${VEHICLE_STAT_JT808_STATE_STORE:-redis}
+      VEHICLE_STAT_JT808_STATE_TTL_DAYS: ${VEHICLE_STAT_JT808_STATE_TTL_DAYS:-3}
+      MYSQL_JDBC_URL: ${MYSQL_JDBC_URL:-}
+      MYSQL_USERNAME: ${MYSQL_USERNAME:-}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD:-}
+      REDIS_HOST: ${REDIS_HOST:-}
+      REDIS_PORT: ${REDIS_PORT:-6379}
+      REDIS_DATABASE: ${REDIS_DATABASE:-50}
+      REDIS_PASSWORD: ${REDIS_PASSWORD:-}
    ports:
      - "${VEHICLE_ANALYTICS_HTTP_PORT:-20300}:20300"
    volumes:
--- a/docs/operations/jt808-daily-mileage-runbook.md
+++ b/docs/operations/jt808-daily-mileage-runbook.md
@@ -0,0 +1,49 @@
+# JT808 Daily Mileage Streaming
+
+## Scope
+
+The analytics app can calculate daily mileage from JT808 telemetry only. It consumes `vehicle.event.jt808.v1`, keeps the rolling per-vehicle daily state in Redis or memory, and upserts the current daily result into MySQL.
+
+## Required MySQL Table
+
+```sql
+create table if not exists vehicle_daily_mileage_jt808 (
+  stat_date date not null,
+  vehicle_key varchar(64) not null,
+  vin varchar(32) null,
+  phone varchar(32) null,
+  first_event_time timestamp null,
+  last_event_time timestamp null,
+  gps_mileage_km decimal(12,3) not null,
+  speed_integral_km decimal(12,3) not null,
+  odometer_mileage_km decimal(12,3) null,
+  accepted_points int not null,
+  bad_jump_segments int not null,
+  long_gap_segments int not null,
+  out_of_order_points int not null,
+  odometer_anomalies int not null,
+  data_quality varchar(16) not null,
+  updated_at timestamp not null default current_timestamp on update current_timestamp,
+  primary key (stat_date, vehicle_key),
+  key idx_vehicle_daily_mileage_jt808_vehicle_date (vehicle_key, stat_date)
+);
+```
+
+## Runtime Settings
+
+Set these in Portainer or Nacos, without committing secrets:
+
+```text
+KAFKA_TOPIC_JT808_EVENT=vehicle.event.jt808.v1
+VEHICLE_STAT_JT808_MILEAGE_ENABLED=true
+VEHICLE_STAT_JT808_STATE_STORE=redis
+MYSQL_JDBC_URL=jdbc:mysql://<host>:3306/<database>?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
+MYSQL_USERNAME=<user>
+MYSQL_PASSWORD=<password>
+REDIS_HOST=<host>
+REDIS_PORT=6379
+REDIS_DATABASE=50
+REDIS_PASSWORD=<password>
+```
+
+Algorithm defaults are Asia/Shanghai daily boundary, 5 minute max segment gap, 200 km/h max implied speed, and short-gap jump guard of 300 meters within 10 seconds.
--- a/docs/superpowers/plans/2026-06-30-kafka-streaming-mileage.md
+++ b/docs/superpowers/plans/2026-06-30-kafka-streaming-mileage.md
@@ -0,0 +1,457 @@
+# JT808 Kafka Streaming Mileage Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Consume only JT808 Kafka location events, calculate daily mileage in real time, keep rolling state in Redis or memory, and upsert final/current daily results into MySQL.
+
+**Architecture:** Reuse `vehicle-analytics-app` and `vehicle-stat-service` instead of adding a new runtime. The Kafka consumer subscribes to `vehicle.event.jt808.v1`, extracts JT808 location points from `VehicleEnvelope.telemetry_snapshot`, updates one rolling state per `(vehicleKey, statDate)`, stores that state in Redis DB 50 when available, and writes the current daily aggregate to MySQL table `vehicle_daily_mileage_jt808`. No GB32960 comparison and no historical backfill are required for v1.
+
+**Tech Stack:** Java 21, Spring Boot auto-configuration, existing `sink-mq` Kafka consumer, protobuf `VehicleEnvelope`, Spring Data Redis `StringRedisTemplate`, Spring JDBC `JdbcTemplate`, MySQL `INSERT ... ON DUPLICATE KEY UPDATE`.
+
+---
+
+## Confirmed Runtime Inputs
+
+- Kafka topic: `vehicle.event.jt808.v1`
+- Statistics source: JT808 only
+- MySQL database: reuse the configured production vehicle database
+- MySQL user: use the configured production vehicle database user
+- Redis endpoint: configure through `REDIS_HOST` and `REDIS_PORT`
+- Redis DB: use `50` by default; `50-60` are available
+- Date zone: `Asia/Shanghai`
+- Segment rules:
+  - max segment gap: `PT5M`
+  - max implied speed: `200 km/h`
+  - short-gap jump filter: `PT10S` and `300 m`
+- Historical backfill: not needed for v1
+- Vehicle key:
+  - if VIN is present and not `unknown`, use VIN
+  - otherwise use `jt808:{phone}`
+
+## Configuration To Add
+
+Add these deployment properties to `vehicle-analytics-app`:
+
+```yaml
+spring:
+  data:
+    redis:
+      host: ${REDIS_HOST:}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      database: ${REDIS_DATABASE:50}
+
+lingniu:
+  ingest:
+    sink:
+      mq:
+        consumer:
+          bindings:
+            vehicleStatEnvelopeConsumerProcessor:
+              topics:
+                - ${KAFKA_TOPIC_JT808_EVENT:vehicle.event.jt808.v1}
+    vehicle-stat:
+      jt808-mileage:
+        enabled: ${JT808_MILEAGE_ENABLED:true}
+        mysql:
+          jdbc-url: ${JT808_MILEAGE_MYSQL_JDBC_URL:}
+          username: ${JT808_MILEAGE_MYSQL_USERNAME:}
+          password: ${JT808_MILEAGE_MYSQL_PASSWORD:}
+          table-name: ${JT808_MILEAGE_MYSQL_TABLE:vehicle_daily_mileage_jt808}
+          initialize-schema: ${JT808_MILEAGE_MYSQL_INITIALIZE_SCHEMA:true}
+        state:
+          store: ${JT808_MILEAGE_STATE_STORE:redis}
+          redis-key-prefix: ${JT808_MILEAGE_REDIS_KEY_PREFIX:vehicle:mileage:jt808:daily:}
+          ttl: ${JT808_MILEAGE_REDIS_TTL:P3D}
+        max-segment-gap: ${JT808_MILEAGE_MAX_SEGMENT_GAP:PT5M}
+        max-implied-speed-kmh: ${JT808_MILEAGE_MAX_IMPLIED_SPEED_KMH:200}
+        short-gap: ${JT808_MILEAGE_SHORT_GAP:PT10S}
+        short-gap-jump-meters: ${JT808_MILEAGE_SHORT_GAP_JUMP_METERS:300}
+```
+
+Do not commit real passwords to `application.yml`; pass them through Nacos or environment variables.
+
+## MySQL Table
+
+Create automatically when `initialize-schema=true`:
+
+```sql
+CREATE TABLE IF NOT EXISTS vehicle_daily_mileage_jt808 (
+  id BIGINT AUTO_INCREMENT PRIMARY KEY,
+  stat_date DATE NOT NULL,
+  vehicle_key VARCHAR(64) NOT NULL,
+  vin VARCHAR(32) NOT NULL DEFAULT '',
+  phone VARCHAR(32) NOT NULL DEFAULT '',
+  first_event_time DATETIME(3) NULL,
+  last_event_time DATETIME(3) NULL,
+  gps_mileage_km DECIMAL(12,3) NOT NULL DEFAULT 0,
+  speed_integral_km DECIMAL(12,3) NOT NULL DEFAULT 0,
+  odometer_mileage_km DECIMAL(12,3) NULL,
+  accepted_points INT NOT NULL DEFAULT 0,
+  bad_jump_segments INT NOT NULL DEFAULT 0,
+  long_gap_segments INT NOT NULL DEFAULT 0,
+  out_of_order_points INT NOT NULL DEFAULT 0,
+  odometer_anomalies INT NOT NULL DEFAULT 0,
+  data_quality VARCHAR(16) NOT NULL DEFAULT 'PARTIAL',
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  UNIQUE KEY uk_jt808_daily_mileage (stat_date, vehicle_key),
+  KEY idx_jt808_daily_mileage_vin_date (vin, stat_date),
+  KEY idx_jt808_daily_mileage_phone_date (phone, stat_date)
+);
+```
+
+## File Structure
+
+- Modify `modules/services/vehicle-stat-service/pom.xml`
+  - Add `spring-boot-starter-data-redis`, `spring-jdbc`, and `mysql-connector-j` if not already present through module dependencies.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageProperties.java`
+  - Configuration properties for MySQL, Redis state, and GPS filters.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPoint.java`
+  - Normalized JT808 point.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPointExtractor.java`
+  - Extracts only JT808 location snapshots from Kafka envelopes.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808GpsMileageCalculator.java`
+  - Haversine segment calculator with filtering.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageState.java`
+  - Rolling mutable daily state.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageResult.java`
+  - Persisted result model.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStateStore.java`
+  - State load/save abstraction.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/RedisJt808MileageStateStore.java`
+  - Redis JSON state store using `StringRedisTemplate`.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/InMemoryJt808MileageStateStore.java`
+  - Local fallback state store.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/JdbcJt808DailyMileageRepository.java`
+  - MySQL schema initialization and upsert.
+- Create `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStreamProcessor.java`
+  - One-envelope processing flow.
+- Modify `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/VehicleStatEnvelopeIngestor.java`
+  - Fan out to existing odometer processor and optional JT808 mileage stream processor.
+- Modify `modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/config/VehicleStatAutoConfiguration.java`
+  - Wire the new JT808 mileage beans.
+- Modify `modules/apps/vehicle-analytics-app/src/main/resources/application.yml`
+  - Change stat binding topic to `vehicle.event.jt808.v1` when JT808 mileage is enabled.
+
+## Task 1: JT808 Point Extraction
+
+**Files:**
+- Create: `.../jt808/Jt808LocationPoint.java`
+- Create: `.../jt808/Jt808LocationPointExtractor.java`
+- Test: `.../Jt808LocationPointExtractorTest.java`
+
+- [ ] **Step 1: Write failing tests**
+
+Test cases:
+- Extracts a `source=JT808`, `eventType=LOCATION` envelope with `longitude`, `latitude`, `speed_kmh`, `location_status_raw`, and `total_mileage_km`.
+- Returns empty for `source=GB32960`.
+- Returns empty when longitude or latitude is missing.
+- Uses VIN as `vehicleKey` when VIN is not blank and not `unknown`.
+- Uses `jt808:{phone}` when VIN is `unknown`.
+
+- [ ] **Step 2: Implement extractor**
+
+The normalized record should contain:
+
+```java
+public record Jt808LocationPoint(
+        String vehicleKey,
+        String vin,
+        String phone,
+        Instant eventTime,
+        double longitude,
+        double latitude,
+        Double speedKmh,
+        Long statusFlag,
+        Double totalMileageKm
+) {}
+```
+
+- [ ] **Step 3: Verify**
+
+Run:
+
+```bash
+mvn -pl :vehicle-stat-service -Dtest=Jt808LocationPointExtractorTest test
+```
+
+Expected: tests pass.
+
+## Task 2: GPS Segment Calculator
+
+**Files:**
+- Create: `.../jt808/Jt808GpsMileageCalculator.java`
+- Test: `.../Jt808GpsMileageCalculatorTest.java`
+
+- [ ] **Step 1: Write failing tests**
+
+Cover:
+- Valid adjacent points accumulate Haversine distance.
+- `dt <= 0` increments out-of-order/non-positive counter.
+- `dt > PT5M` increments long-gap counter and does not accumulate.
+- implied speed `> 200 km/h` increments bad-jump counter and does not accumulate.
+- speed integral uses adjacent average speed.
+
+- [ ] **Step 2: Implement calculator**
+
+Return a segment result with:
+- `gpsKm`
+- `speedIntegralKm`
+- `used`
+- `badJump`
+- `longGap`
+- `outOfOrder`
+
+- [ ] **Step 3: Verify**
+
+Run:
+
+```bash
+mvn -pl :vehicle-stat-service -Dtest=Jt808GpsMileageCalculatorTest test
+```
+
+Expected: tests pass.
+
+## Task 3: Rolling State In Redis/Memory
+
+**Files:**
+- Create: `.../jt808/Jt808DailyMileageState.java`
+- Create: `.../jt808/Jt808MileageStateStore.java`
+- Create: `.../jt808/RedisJt808MileageStateStore.java`
+- Create: `.../jt808/InMemoryJt808MileageStateStore.java`
+- Test: `.../Jt808DailyMileageStateTest.java`
+- Test: `.../RedisJt808MileageStateStoreTest.java`
+
+- [ ] **Step 1: Write failing state tests**
+
+Cover:
+- First point initializes state without distance.
+- Ordered point updates GPS and speed mileage.
+- Duplicate/older point is ignored.
+- Monotonic `totalMileageKm` updates `odometerMileageKm`.
+- Odometer rollback increments anomaly counter.
+
+- [ ] **Step 2: Implement state key**
+
+Use Redis key:
+
+```text
+vehicle:mileage:jt808:daily:{statDate}:{vehicleKey}
+```
+
+Example:
+
+```text
+vehicle:mileage:jt808:daily:2026-06-30:LKLG7C4E7NA774755
+vehicle:mileage:jt808:daily:2026-06-30:jt808:40692934289
+```
+
+- [ ] **Step 3: Implement Redis store**
+
+Use JSON value and TTL `P3D`. Use DB selection through Spring Redis database config, not by issuing `SELECT` manually.
+
+- [ ] **Step 4: Verify**
+
+Run:
+
+```bash
+mvn -pl :vehicle-stat-service -Dtest=Jt808DailyMileageStateTest,RedisJt808MileageStateStoreTest test
+```
+
+Expected: tests pass.
+
+## Task 4: MySQL Result Repository
+
+**Files:**
+- Create: `.../jt808/Jt808DailyMileageResult.java`
+- Create: `.../jt808/JdbcJt808DailyMileageRepository.java`
+- Test: `.../JdbcJt808DailyMileageRepositoryTest.java`
+
+- [ ] **Step 1: Write failing repository tests**
+
+Use H2 MySQL mode. Cover:
+- Schema initialization creates `vehicle_daily_mileage_jt808`.
+- Upsert inserts first result.
+- Upsert updates same `(stat_date, vehicle_key)`.
+- Query by date and vehicle key returns latest result.
+
+- [ ] **Step 2: Implement repository**
+
+Use `JdbcTemplate` and:
+
+```sql
+INSERT INTO vehicle_daily_mileage_jt808 (...)
+VALUES (...)
+ON DUPLICATE KEY UPDATE
+  vin = VALUES(vin),
+  phone = VALUES(phone),
+  first_event_time = VALUES(first_event_time),
+  last_event_time = VALUES(last_event_time),
+  gps_mileage_km = VALUES(gps_mileage_km),
+  speed_integral_km = VALUES(speed_integral_km),
+  odometer_mileage_km = VALUES(odometer_mileage_km),
+  accepted_points = VALUES(accepted_points),
+  bad_jump_segments = VALUES(bad_jump_segments),
+  long_gap_segments = VALUES(long_gap_segments),
+  out_of_order_points = VALUES(out_of_order_points),
+  odometer_anomalies = VALUES(odometer_anomalies),
+  data_quality = VALUES(data_quality)
+```
+
+- [ ] **Step 3: Verify**
+
+Run:
+
+```bash
+mvn -pl :vehicle-stat-service -Dtest=JdbcJt808DailyMileageRepositoryTest test
+```
+
+Expected: tests pass.
+
+## Task 5: Kafka Processor Fan-Out
+
+**Files:**
+- Create: `.../jt808/Jt808MileageStreamProcessor.java`
+- Modify: `.../VehicleStatEnvelopeIngestor.java`
+- Test: `.../Jt808MileageStreamProcessorTest.java`
+- Test: `.../VehicleStatEnvelopeIngestorTest.java`
+
+- [ ] **Step 1: Write failing processor tests**
+
+Cover:
+- Two JT808 location envelopes update state and upsert MySQL result.
+- GB32960 envelope is ignored.
+- VIN unknown uses phone key.
+- Different natural days create different states.
+
+- [ ] **Step 2: Implement processor flow**
+
+Flow:
+
+```text
+VehicleEnvelope bytes
+-> Jt808LocationPointExtractor
+-> statDate from eventTime at Asia/Shanghai
+-> stateStore.load(key) or new state
+-> state.apply(point, calculator)
+-> stateStore.save(state)
+-> mysqlRepository.upsert(state.toResult())
+```
+
+- [ ] **Step 3: Modify ingestor**
+
+Keep the old `VehicleStatEventProcessor` path for compatibility, but add optional `Jt808MileageStreamProcessor`. The new processor ignores non-JT808 envelopes internally.
+
+- [ ] **Step 4: Verify**
+
+Run:
+
+```bash
+mvn -pl :vehicle-stat-service -Dtest=Jt808MileageStreamProcessorTest,VehicleStatEnvelopeIngestorTest test
+```
+
+Expected: tests pass.
+
+## Task 6: Auto-Configuration And App Properties
+
+**Files:**
+- Modify: `.../config/VehicleStatAutoConfiguration.java`
+- Modify: `modules/apps/vehicle-analytics-app/src/main/resources/application.yml`
+- Test: `.../config/VehicleStatAutoConfigurationTest.java`
+
+- [ ] **Step 1: Write failing auto-config tests**
+
+Cover:
+- JT808 mileage beans are present when `lingniu.ingest.vehicle-stat.jt808-mileage.enabled=true`.
+- Redis state store is used when `state.store=redis` and `StringRedisTemplate` exists.
+- Memory state store is used when `state.store=memory`.
+- MySQL repository initializes when config is present.
+
+- [ ] **Step 2: Wire beans**
+
+Create beans for:
+- `Jt808LocationPointExtractor`
+- `Jt808GpsMileageCalculator`
+- `Jt808MileageStateStore`
+- `JdbcJt808DailyMileageRepository`
+- `Jt808MileageStreamProcessor`
+
+- [ ] **Step 3: Update analytics app Kafka binding**
+
+For `vehicleStatEnvelopeConsumerProcessor`, topic must be:
+
+```yaml
+- ${KAFKA_TOPIC_JT808_EVENT:vehicle.event.jt808.v1}
+```
+
+- [ ] **Step 4: Verify**
+
+Run:
+
+```bash
+mvn -pl :vehicle-stat-service,:vehicle-analytics-app -am test
+```
+
+Expected: tests pass.
+
+## Task 7: Deployment Smoke Test
+
+**Files:**
+- Modify: `deploy/portainer/docker-compose.yml`
+- Modify: `docs/operations/gb32960-service-split-runbook.md`
+
+- [ ] **Step 1: Add environment variables**
+
+Add to `vehicle-analytics-app`:
+
+```yaml
+REDIS_HOST: ${REDIS_HOST:-}
+REDIS_PORT: ${REDIS_PORT:-6379}
+REDIS_DATABASE: ${REDIS_DATABASE:-50}
+REDIS_PASSWORD: ${REDIS_PASSWORD:-}
+KAFKA_TOPIC_JT808_EVENT: ${KAFKA_TOPIC_JT808_EVENT:-vehicle.event.jt808.v1}
+JT808_MILEAGE_ENABLED: ${JT808_MILEAGE_ENABLED:-true}
+JT808_MILEAGE_STATE_STORE: ${JT808_MILEAGE_STATE_STORE:-redis}
+JT808_MILEAGE_MYSQL_JDBC_URL: ${JT808_MILEAGE_MYSQL_JDBC_URL:-}
+JT808_MILEAGE_MYSQL_USERNAME: ${JT808_MILEAGE_MYSQL_USERNAME:-}
+JT808_MILEAGE_MYSQL_PASSWORD: ${JT808_MILEAGE_MYSQL_PASSWORD:-}
+```
+
+- [ ] **Step 2: Run live smoke**
+
+Start analytics app and verify:
+- Redis keys appear under `vehicle:mileage:jt808:daily:*`.
+- MySQL table `vehicle_daily_mileage_jt808` receives/upserts rows.
+- Kafka consumer group `vehicle-stat` advances on `vehicle.event.jt808.v1`.
+
+- [ ] **Step 3: Check one vehicle**
+
+For a known active 808 vehicle, query:
+
+```sql
+SELECT *
+FROM vehicle_daily_mileage_jt808
+WHERE stat_date = CURRENT_DATE
+ORDER BY gps_mileage_km DESC
+LIMIT 20;
+```
+
+Expected: rows show increasing `accepted_points`, `last_event_time`, and mileage during the day.
+
+## Remaining Needed Support
+
+- MySQL password should be supplied through Nacos/env as `JT808_MILEAGE_MYSQL_PASSWORD`; do not commit it.
+- Redis password value should be supplied through Nacos/env as `REDIS_PASSWORD`; do not commit it.
+
+## Risks And Decisions
+
+- Redis is rolling state, not the source of truth. MySQL is the durable daily result.
+- Memory state is acceptable only for local/dev or emergency Redis outage; restart loses segment continuity until the next point.
+- No historical backfill means the first deployment day only calculates from the consumer start offset unless Kafka group is reset.
+- JT808 GPS-only mileage is an estimate. Rows with high `bad_jump_segments`, high `long_gap_segments`, or no VIN should be marked `PARTIAL`.
+
+## Self-Review
+
+- Spec coverage: JT808-only Kafka streaming, Redis/memory state, MySQL result persistence, confirmed topic, confirmed daily algorithm defaults, and no backfill are covered.
+- Placeholder scan: The only open item is deliberately listed under Remaining Needed Support: MySQL connection identity if not already inherited from deployment.
+- Type consistency: The plan uses the `Jt808*` class family throughout and removes cross-protocol verifier scope.
--- a/modules/apps/vehicle-analytics-app/src/main/resources/application.yml
+++ b/modules/apps/vehicle-analytics-app/src/main/resources/application.yml
@@ -17,6 +17,17 @@ spring:
  threads:
    virtual:
      enabled: true
+  datasource:
+    url: ${MYSQL_JDBC_URL:}
+    username: ${MYSQL_USERNAME:}
+    password: ${MYSQL_PASSWORD:}
+    driver-class-name: com.mysql.cj.jdbc.Driver
+  data:
+    redis:
+      host: ${REDIS_HOST:}
+      port: ${REDIS_PORT:6379}
+      password: ${REDIS_PASSWORD:}
+      database: ${REDIS_DATABASE:50}

 server:
  port: ${HTTP_PORT:20300}
@@ -37,8 +48,8 @@ lingniu:
        type: kafka
        bootstrap-servers: ${KAFKA_BROKERS:114.55.58.251:9092}
        topics:
-          realtime: ${KAFKA_TOPIC_GB32960_EVENT:vehicle.event.gb32960.v1}
-          dlq: ${KAFKA_TOPIC_GB32960_DLQ:vehicle.dlq.gb32960.v1}
+          realtime: ${KAFKA_TOPIC_JT808_EVENT:vehicle.event.jt808.v1}
+          dlq: ${KAFKA_TOPIC_JT808_DLQ:vehicle.dlq.jt808.v1}
        consumer:
          enabled: ${KAFKA_CONSUMER_ENABLED:true}
          client-id-prefix: ${KAFKA_CONSUMER_CLIENT_ID_PREFIX:vehicle-analytics}
@@ -49,12 +60,12 @@ lingniu:
              enabled: ${VEHICLE_STATE_ENABLED:false}
              group-id: ${KAFKA_GROUP_STATE:vehicle-state}
              topics:
-                - ${KAFKA_TOPIC_GB32960_EVENT:vehicle.event.gb32960.v1}
+                - ${KAFKA_TOPIC_JT808_EVENT:vehicle.event.jt808.v1}
            vehicleStatEnvelopeConsumerProcessor:
              enabled: ${VEHICLE_STAT_ENABLED:true}
              group-id: ${KAFKA_GROUP_STAT:vehicle-stat}
              topics:
-                - ${KAFKA_TOPIC_GB32960_EVENT:vehicle.event.gb32960.v1}
+                - ${KAFKA_TOPIC_JT808_EVENT:vehicle.event.jt808.v1}
      archive:
        enabled: false
    event-file-store:
@@ -67,6 +78,15 @@ lingniu:
      enabled: ${VEHICLE_STAT_ENABLED:true}
      file-path: ${VEHICLE_STAT_FILE_PATH:./target/vehicle-stat/}
      zone-id: ${VEHICLE_STAT_ZONE_ID:Asia/Shanghai}
+      jt808:
+        enabled: ${VEHICLE_STAT_JT808_MILEAGE_ENABLED:false}
+        state-store: ${VEHICLE_STAT_JT808_STATE_STORE:redis}
+        redis-key-prefix: ${VEHICLE_STAT_JT808_REDIS_KEY_PREFIX:vehicle:mileage:jt808:daily:}
+        state-ttl-days: ${VEHICLE_STAT_JT808_STATE_TTL_DAYS:3}
+        max-segment-gap-seconds: ${VEHICLE_STAT_JT808_MAX_SEGMENT_GAP_SECONDS:300}
+        max-implied-speed-kmh: ${VEHICLE_STAT_JT808_MAX_IMPLIED_SPEED_KMH:200}
+        short-gap-seconds: ${VEHICLE_STAT_JT808_SHORT_GAP_SECONDS:10}
+        short-gap-jump-meters: ${VEHICLE_STAT_JT808_SHORT_GAP_JUMP_METERS:300}

 management:
  endpoints:
--- a/modules/services/vehicle-stat-service/pom.xml
+++ b/modules/services/vehicle-stat-service/pom.xml
@@ -28,6 +28,18 @@
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-redis</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-jdbc</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
@@ -53,5 +65,10 @@
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>test</scope>
+        </dependency>
    </dependencies>
 </project>
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/VehicleStatEnvelopeIngestor.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/VehicleStatEnvelopeIngestor.java
@@ -4,16 +4,24 @@ import com.google.protobuf.InvalidProtocolBufferException;
 import com.lingniu.ingest.api.consumer.EnvelopeIngestResult;
 import com.lingniu.ingest.api.consumer.EnvelopeIngestor;
 import com.lingniu.ingest.sink.mq.proto.VehicleEnvelope;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808MileageStreamProcessor;

 public final class VehicleStatEnvelopeIngestor implements EnvelopeIngestor {

    private final VehicleStatEventProcessor processor;
+    private final Jt808MileageStreamProcessor jt808MileageProcessor;

    public VehicleStatEnvelopeIngestor(VehicleStatEventProcessor processor) {
+        this(processor, null);
+    }
+
+    public VehicleStatEnvelopeIngestor(VehicleStatEventProcessor processor,
+                                       Jt808MileageStreamProcessor jt808MileageProcessor) {
        if (processor == null) {
            throw new IllegalArgumentException("processor must not be null");
        }
        this.processor = processor;
+        this.jt808MileageProcessor = jt808MileageProcessor;
    }

    public void ingest(byte[] kafkaValue) {
@@ -22,6 +30,7 @@ public final class VehicleStatEnvelopeIngestor implements EnvelopeIngestor {
            return;
        }
        processor.process(envelope);
+        processJt808Mileage(envelope);
    }

    @Override
@@ -34,6 +43,7 @@ public final class VehicleStatEnvelopeIngestor implements EnvelopeIngestor {
                        envelope.getEventId(), envelope.getVin(), "envelope telemetry_snapshot is required");
            }
            processor.process(envelope);
+            processJt808Mileage(envelope);
            return EnvelopeIngestResult.processed(envelope.getEventId(), envelope.getVin());
        } catch (IllegalArgumentException ex) {
            return envelope == null
@@ -42,6 +52,12 @@ public final class VehicleStatEnvelopeIngestor implements EnvelopeIngestor {
        }
    }

+    private void processJt808Mileage(VehicleEnvelope envelope) {
+        if (jt808MileageProcessor != null) {
+            jt808MileageProcessor.process(envelope);
+        }
+    }
+
    private static VehicleEnvelope parse(byte[] kafkaValue) {
        if (kafkaValue == null || kafkaValue.length == 0) {
            throw new IllegalArgumentException("VehicleEnvelope bytes must not be empty");
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/config/VehicleStatAutoConfiguration.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/config/VehicleStatAutoConfiguration.java
@@ -13,14 +13,27 @@ import com.lingniu.ingest.vehiclestat.VehicleStatEventProcessor;
 import com.lingniu.ingest.vehiclestat.VehicleStatRepository;
 import com.lingniu.ingest.vehiclestat.VehicleStatRule;
 import com.lingniu.ingest.vehiclestat.VehicleStatRuleRepository;
+import com.lingniu.ingest.vehiclestat.jt808.InMemoryJt808MileageStateStore;
+import com.lingniu.ingest.vehiclestat.jt808.JdbcJt808DailyMileageRepository;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808DailyMileageRepository;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808GpsMileageCalculator;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808LocationPointExtractor;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808MileageStateStore;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808MileageStreamProcessor;
+import com.lingniu.ingest.vehiclestat.jt808.RedisJt808MileageStateStore;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.context.annotation.Bean;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.jdbc.core.JdbcTemplate;

 import java.nio.file.Path;
+import java.time.Duration;
 import java.time.ZoneId;

@AutoConfiguration
@@ -66,8 +79,70 @@ public class VehicleStatAutoConfiguration {
    @Bean
    @ConditionalOnBean(VehicleStatEventProcessor.class)
    @ConditionalOnMissingBean
-    public VehicleStatEnvelopeIngestor vehicleStatEnvelopeIngestor(VehicleStatEventProcessor processor) {
-        return new VehicleStatEnvelopeIngestor(processor);
+    public VehicleStatEnvelopeIngestor vehicleStatEnvelopeIngestor(
+            VehicleStatEventProcessor processor,
+            ObjectProvider<Jt808MileageStreamProcessor> jt808MileageProcessor) {
+        return new VehicleStatEnvelopeIngestor(processor, jt808MileageProcessor.getIfAvailable());
+    }
+
+    @Bean
+    @ConditionalOnProperty(prefix = "lingniu.ingest.vehicle-stat.jt808", name = "enabled", havingValue = "true")
+    @ConditionalOnMissingBean
+    public Jt808LocationPointExtractor jt808LocationPointExtractor() {
+        return new Jt808LocationPointExtractor();
+    }
+
+    @Bean
+    @ConditionalOnProperty(prefix = "lingniu.ingest.vehicle-stat.jt808", name = "enabled", havingValue = "true")
+    @ConditionalOnMissingBean
+    public Jt808GpsMileageCalculator jt808GpsMileageCalculator(VehicleStatProperties props) {
+        VehicleStatProperties.Jt808 jt808 = props.getJt808();
+        return new Jt808GpsMileageCalculator(
+                Duration.ofSeconds(jt808.getMaxSegmentGapSeconds()),
+                jt808.getMaxImpliedSpeedKmh(),
+                Duration.ofSeconds(jt808.getShortGapSeconds()),
+                jt808.getShortGapJumpMeters());
+    }
+
+    @Bean
+    @ConditionalOnBean(JdbcTemplate.class)
+    @ConditionalOnProperty(prefix = "lingniu.ingest.vehicle-stat.jt808", name = "enabled", havingValue = "true")
+    @ConditionalOnMissingBean
+    public Jt808DailyMileageRepository jt808DailyMileageRepository(JdbcTemplate jdbcTemplate) {
+        return new JdbcJt808DailyMileageRepository(jdbcTemplate);
+    }
+
+    @Bean
+    @ConditionalOnBean({StringRedisTemplate.class, ObjectMapper.class})
+    @ConditionalOnProperty(prefix = "lingniu.ingest.vehicle-stat.jt808", name = "enabled", havingValue = "true")
+    @ConditionalOnProperty(prefix = "lingniu.ingest.vehicle-stat.jt808", name = "state-store", havingValue = "redis")
+    @ConditionalOnMissingBean(Jt808MileageStateStore.class)
+    public Jt808MileageStateStore redisJt808MileageStateStore(StringRedisTemplate redis,
+                                                              ObjectMapper objectMapper,
+                                                              VehicleStatProperties props) {
+        VehicleStatProperties.Jt808 jt808 = props.getJt808();
+        return new RedisJt808MileageStateStore(redis, objectMapper,
+                jt808.getRedisKeyPrefix(), Duration.ofDays(jt808.getStateTtlDays()));
+    }
+
+    @Bean
+    @ConditionalOnProperty(prefix = "lingniu.ingest.vehicle-stat.jt808", name = "enabled", havingValue = "true")
+    @ConditionalOnMissingBean(Jt808MileageStateStore.class)
+    public Jt808MileageStateStore inMemoryJt808MileageStateStore() {
+        return new InMemoryJt808MileageStateStore();
+    }
+
+    @Bean
+    @ConditionalOnBean({Jt808LocationPointExtractor.class, Jt808GpsMileageCalculator.class,
+            Jt808MileageStateStore.class, Jt808DailyMileageRepository.class})
+    @ConditionalOnMissingBean
+    public Jt808MileageStreamProcessor jt808MileageStreamProcessor(Jt808LocationPointExtractor extractor,
+                                                                    Jt808GpsMileageCalculator calculator,
+                                                                    Jt808MileageStateStore stateStore,
+                                                                    Jt808DailyMileageRepository repository,
+                                                                    VehicleStatProperties props) {
+        return new Jt808MileageStreamProcessor(extractor, calculator, stateStore, repository,
+                ZoneId.of(props.getZoneId()));
    }

    @Bean
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/config/VehicleStatProperties.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/config/VehicleStatProperties.java
@@ -11,6 +11,8 @@ public class VehicleStatProperties {
    /** 统计自然日口径，默认按国内业务使用东八区。 */
    private String zoneId = "Asia/Shanghai";

+    private Jt808 jt808 = new Jt808();
+
    public String getFilePath() {
        return filePath;
    }
@@ -26,4 +28,87 @@ public class VehicleStatProperties {
    public void setZoneId(String zoneId) {
        this.zoneId = zoneId;
    }
+
+    public Jt808 getJt808() {
+        return jt808;
+    }
+
+    public void setJt808(Jt808 jt808) {
+        this.jt808 = jt808;
+    }
+
+    public static class Jt808 {
+        private boolean enabled;
+        private String stateStore = "memory";
+        private String redisKeyPrefix = "vehicle:mileage:jt808:daily:";
+        private long stateTtlDays = 3;
+        private long maxSegmentGapSeconds = 300;
+        private double maxImpliedSpeedKmh = 200.0;
+        private long shortGapSeconds = 10;
+        private double shortGapJumpMeters = 300.0;
+
+        public boolean isEnabled() {
+            return enabled;
+        }
+
+        public void setEnabled(boolean enabled) {
+            this.enabled = enabled;
+        }
+
+        public String getStateStore() {
+            return stateStore;
+        }
+
+        public void setStateStore(String stateStore) {
+            this.stateStore = stateStore;
+        }
+
+        public String getRedisKeyPrefix() {
+            return redisKeyPrefix;
+        }
+
+        public void setRedisKeyPrefix(String redisKeyPrefix) {
+            this.redisKeyPrefix = redisKeyPrefix;
+        }
+
+        public long getStateTtlDays() {
+            return stateTtlDays;
+        }
+
+        public void setStateTtlDays(long stateTtlDays) {
+            this.stateTtlDays = stateTtlDays;
+        }
+
+        public long getMaxSegmentGapSeconds() {
+            return maxSegmentGapSeconds;
+        }
+
+        public void setMaxSegmentGapSeconds(long maxSegmentGapSeconds) {
+            this.maxSegmentGapSeconds = maxSegmentGapSeconds;
+        }
+
+        public double getMaxImpliedSpeedKmh() {
+            return maxImpliedSpeedKmh;
+        }
+
+        public void setMaxImpliedSpeedKmh(double maxImpliedSpeedKmh) {
+            this.maxImpliedSpeedKmh = maxImpliedSpeedKmh;
+        }
+
+        public long getShortGapSeconds() {
+            return shortGapSeconds;
+        }
+
+        public void setShortGapSeconds(long shortGapSeconds) {
+            this.shortGapSeconds = shortGapSeconds;
+        }
+
+        public double getShortGapJumpMeters() {
+            return shortGapJumpMeters;
+        }
+
+        public void setShortGapJumpMeters(double shortGapJumpMeters) {
+            this.shortGapJumpMeters = shortGapJumpMeters;
+        }
+    }
 }
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/InMemoryJt808MileageStateStore.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/InMemoryJt808MileageStateStore.java
@@ -0,0 +1,25 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import java.time.LocalDate;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+public final class InMemoryJt808MileageStateStore implements Jt808MileageStateStore {
+
+    private final Map<String, Jt808DailyMileageState> states = new ConcurrentHashMap<>();
+
+    @Override
+    public Optional<Jt808DailyMileageState> load(String vehicleKey, LocalDate statDate) {
+        return Optional.ofNullable(states.get(key(vehicleKey, statDate)));
+    }
+
+    @Override
+    public void save(Jt808DailyMileageState state) {
+        states.put(key(state.vehicleKey(), state.statDate()), state);
+    }
+
+    private static String key(String vehicleKey, LocalDate statDate) {
+        return statDate + ":" + vehicleKey;
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/JdbcJt808DailyMileageRepository.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/JdbcJt808DailyMileageRepository.java
@@ -0,0 +1,61 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import org.springframework.jdbc.core.JdbcTemplate;
+
+import java.sql.Timestamp;
+import java.time.Instant;
+
+public final class JdbcJt808DailyMileageRepository implements Jt808DailyMileageRepository {
+
+    private final JdbcTemplate jdbc;
+
+    public JdbcJt808DailyMileageRepository(JdbcTemplate jdbc) {
+        this.jdbc = jdbc;
+    }
+
+    @Override
+    public void upsert(Jt808DailyMileageResult result) {
+        jdbc.update("""
+                        insert into vehicle_daily_mileage_jt808 (
+                          stat_date, vehicle_key, vin, phone, first_event_time, last_event_time,
+                          gps_mileage_km, speed_integral_km, odometer_mileage_km,
+                          accepted_points, bad_jump_segments, long_gap_segments, out_of_order_points,
+                          odometer_anomalies, data_quality
+                        ) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                        on duplicate key update
+                          vin = values(vin),
+                          phone = values(phone),
+                          first_event_time = values(first_event_time),
+                          last_event_time = values(last_event_time),
+                          gps_mileage_km = values(gps_mileage_km),
+                          speed_integral_km = values(speed_integral_km),
+                          odometer_mileage_km = values(odometer_mileage_km),
+                          accepted_points = values(accepted_points),
+                          bad_jump_segments = values(bad_jump_segments),
+                          long_gap_segments = values(long_gap_segments),
+                          out_of_order_points = values(out_of_order_points),
+                          odometer_anomalies = values(odometer_anomalies),
+                          data_quality = values(data_quality),
+                          updated_at = current_timestamp
+                        """,
+                result.statDate(),
+                result.vehicleKey(),
+                result.vin(),
+                result.phone(),
+                timestamp(result.firstEventTime()),
+                timestamp(result.lastEventTime()),
+                result.gpsMileageKm(),
+                result.speedIntegralKm(),
+                result.odometerMileageKm(),
+                result.acceptedPoints(),
+                result.badJumpSegments(),
+                result.longGapSegments(),
+                result.outOfOrderPoints(),
+                result.odometerAnomalies(),
+                result.dataQuality());
+    }
+
+    private static Timestamp timestamp(Instant instant) {
+        return instant == null ? null : Timestamp.from(instant);
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageRepository.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageRepository.java
@@ -0,0 +1,6 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+public interface Jt808DailyMileageRepository {
+
+    void upsert(Jt808DailyMileageResult result);
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageResult.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageResult.java
@@ -0,0 +1,22 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import java.time.Instant;
+import java.time.LocalDate;
+
+public record Jt808DailyMileageResult(
+        LocalDate statDate,
+        String vehicleKey,
+        String vin,
+        String phone,
+        Instant firstEventTime,
+        Instant lastEventTime,
+        double gpsMileageKm,
+        double speedIntegralKm,
+        Double odometerMileageKm,
+        int acceptedPoints,
+        int badJumpSegments,
+        int longGapSegments,
+        int outOfOrderPoints,
+        int odometerAnomalies,
+        String dataQuality
+) {}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageState.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageState.java
@@ -0,0 +1,223 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import java.time.Instant;
+import java.time.LocalDate;
+
+public final class Jt808DailyMileageState {
+
+    private final String vehicleKey;
+    private final String vin;
+    private final String phone;
+    private final LocalDate statDate;
+    private Instant firstEventTime;
+    private Instant lastEventTime;
+    private Jt808LocationPoint lastPoint;
+    private double lastTotalMileageKm = Double.NaN;
+    private double gpsMileageKm;
+    private double speedIntegralKm;
+    private double odometerMileageKm;
+    private int acceptedPoints;
+    private int badJumpSegments;
+    private int longGapSegments;
+    private int outOfOrderPoints;
+    private int odometerAnomalies;
+
+    private Jt808DailyMileageState(String vehicleKey, String vin, String phone, LocalDate statDate) {
+        if (vehicleKey == null || vehicleKey.isBlank()) {
+            throw new IllegalArgumentException("vehicleKey must not be blank");
+        }
+        if (statDate == null) {
+            throw new IllegalArgumentException("statDate must not be null");
+        }
+        this.vehicleKey = vehicleKey;
+        this.vin = vin == null ? "" : vin;
+        this.phone = phone == null ? "" : phone;
+        this.statDate = statDate;
+    }
+
+    public static Jt808DailyMileageState empty(String vehicleKey, String vin, String phone, LocalDate statDate) {
+        return new Jt808DailyMileageState(vehicleKey, vin, phone, statDate);
+    }
+
+    public static Jt808DailyMileageState restore(
+            String vehicleKey,
+            String vin,
+            String phone,
+            LocalDate statDate,
+            Instant firstEventTime,
+            Instant lastEventTime,
+            Jt808LocationPoint lastPoint,
+            double lastTotalMileageKm,
+            double gpsMileageKm,
+            double speedIntegralKm,
+            double odometerMileageKm,
+            int acceptedPoints,
+            int badJumpSegments,
+            int longGapSegments,
+            int outOfOrderPoints,
+            int odometerAnomalies) {
+        Jt808DailyMileageState state = new Jt808DailyMileageState(vehicleKey, vin, phone, statDate);
+        state.firstEventTime = firstEventTime;
+        state.lastEventTime = lastEventTime;
+        state.lastPoint = lastPoint;
+        state.lastTotalMileageKm = lastTotalMileageKm;
+        state.gpsMileageKm = gpsMileageKm;
+        state.speedIntegralKm = speedIntegralKm;
+        state.odometerMileageKm = odometerMileageKm;
+        state.acceptedPoints = acceptedPoints;
+        state.badJumpSegments = badJumpSegments;
+        state.longGapSegments = longGapSegments;
+        state.outOfOrderPoints = outOfOrderPoints;
+        state.odometerAnomalies = odometerAnomalies;
+        return state;
+    }
+
+    public void apply(Jt808LocationPoint point, Jt808GpsMileageCalculator calculator) {
+        if (point == null || calculator == null) {
+            return;
+        }
+        if (lastPoint != null && !point.eventTime().isAfter(lastPoint.eventTime())) {
+            outOfOrderPoints++;
+            return;
+        }
+        if (lastPoint == null) {
+            firstEventTime = point.eventTime();
+            updateOdometer(point);
+            accept(point);
+            return;
+        }
+
+        Jt808GpsMileageCalculator.SegmentResult segment = calculator.calculateSegment(lastPoint, point);
+        if (segment.outOfOrder()) {
+            outOfOrderPoints++;
+            return;
+        }
+        if (segment.longGap()) {
+            longGapSegments++;
+        } else if (segment.badJump()) {
+            badJumpSegments++;
+        } else if (segment.used()) {
+            gpsMileageKm += segment.gpsKm();
+            speedIntegralKm += segment.speedIntegralKm();
+        }
+        updateOdometer(point);
+        accept(point);
+    }
+
+    public Jt808DailyMileageResult toResult() {
+        return new Jt808DailyMileageResult(
+                statDate,
+                vehicleKey,
+                vin,
+                phone,
+                firstEventTime,
+                lastEventTime,
+                gpsMileageKm,
+                speedIntegralKm,
+                odometerMileageKm > 0.0 ? odometerMileageKm : null,
+                acceptedPoints,
+                badJumpSegments,
+                longGapSegments,
+                outOfOrderPoints,
+                odometerAnomalies,
+                dataQuality());
+    }
+
+    private void accept(Jt808LocationPoint point) {
+        lastPoint = point;
+        lastEventTime = point.eventTime();
+        acceptedPoints++;
+    }
+
+    private void updateOdometer(Jt808LocationPoint point) {
+        if (point.totalMileageKm() == null || !Double.isFinite(point.totalMileageKm())) {
+            return;
+        }
+        double current = point.totalMileageKm();
+        if (!Double.isFinite(lastTotalMileageKm)) {
+            lastTotalMileageKm = current;
+            return;
+        }
+        if (current < lastTotalMileageKm) {
+            odometerAnomalies++;
+            lastTotalMileageKm = current;
+            return;
+        }
+        odometerMileageKm += current - lastTotalMileageKm;
+        lastTotalMileageKm = current;
+    }
+
+    private String dataQuality() {
+        if (acceptedPoints < 2) {
+            return "PARTIAL";
+        }
+        if (badJumpSegments > 0 || longGapSegments > 0 || vehicleKey.startsWith("jt808:")) {
+            return "PARTIAL";
+        }
+        return "GOOD";
+    }
+
+    public String vehicleKey() {
+        return vehicleKey;
+    }
+
+    public String vin() {
+        return vin;
+    }
+
+    public String phone() {
+        return phone;
+    }
+
+    public LocalDate statDate() {
+        return statDate;
+    }
+
+    public Instant firstEventTime() {
+        return firstEventTime;
+    }
+
+    public Instant lastEventTime() {
+        return lastEventTime;
+    }
+
+    public Jt808LocationPoint lastPoint() {
+        return lastPoint;
+    }
+
+    public double gpsMileageKm() {
+        return gpsMileageKm;
+    }
+
+    public double speedIntegralKm() {
+        return speedIntegralKm;
+    }
+
+    public double odometerMileageKm() {
+        return odometerMileageKm;
+    }
+
+    public double lastTotalMileageKm() {
+        return lastTotalMileageKm;
+    }
+
+    public int acceptedPoints() {
+        return acceptedPoints;
+    }
+
+    public int badJumpSegments() {
+        return badJumpSegments;
+    }
+
+    public int longGapSegments() {
+        return longGapSegments;
+    }
+
+    public int outOfOrderPoints() {
+        return outOfOrderPoints;
+    }
+
+    public int odometerAnomalies() {
+        return odometerAnomalies;
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808GpsMileageCalculator.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808GpsMileageCalculator.java
@@ -0,0 +1,93 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import java.time.Duration;
+
+public final class Jt808GpsMileageCalculator {
+
+    private static final double EARTH_RADIUS_KM = 6371.0088;
+
+    private final Duration maxSegmentGap;
+    private final double maxImpliedSpeedKmh;
+    private final Duration shortGap;
+    private final double shortGapJumpMeters;
+
+    public Jt808GpsMileageCalculator(Duration maxSegmentGap,
+                                     double maxImpliedSpeedKmh,
+                                     Duration shortGap,
+                                     double shortGapJumpMeters) {
+        if (maxSegmentGap == null || maxSegmentGap.isNegative() || maxSegmentGap.isZero()) {
+            throw new IllegalArgumentException("maxSegmentGap must be positive");
+        }
+        if (shortGap == null || shortGap.isNegative() || shortGap.isZero()) {
+            throw new IllegalArgumentException("shortGap must be positive");
+        }
+        if (!Double.isFinite(maxImpliedSpeedKmh) || maxImpliedSpeedKmh <= 0) {
+            throw new IllegalArgumentException("maxImpliedSpeedKmh must be positive");
+        }
+        if (!Double.isFinite(shortGapJumpMeters) || shortGapJumpMeters <= 0) {
+            throw new IllegalArgumentException("shortGapJumpMeters must be positive");
+        }
+        this.maxSegmentGap = maxSegmentGap;
+        this.maxImpliedSpeedKmh = maxImpliedSpeedKmh;
+        this.shortGap = shortGap;
+        this.shortGapJumpMeters = shortGapJumpMeters;
+    }
+
+    public SegmentResult calculateSegment(Jt808LocationPoint previous, Jt808LocationPoint current) {
+        if (previous == null || current == null) {
+            return SegmentResult.rejectedOutOfOrder();
+        }
+        Duration elapsed = Duration.between(previous.eventTime(), current.eventTime());
+        if (elapsed.isZero() || elapsed.isNegative()) {
+            return SegmentResult.rejectedOutOfOrder();
+        }
+        if (elapsed.compareTo(maxSegmentGap) > 0) {
+            return SegmentResult.rejectedLongGap();
+        }
+
+        double gpsKm = haversineKm(previous.longitude(), previous.latitude(), current.longitude(), current.latitude());
+        double hours = elapsed.toMillis() / 3_600_000.0;
+        double impliedSpeed = gpsKm / hours;
+        if (impliedSpeed > maxImpliedSpeedKmh
+                || (elapsed.compareTo(shortGap) <= 0 && gpsKm * 1000.0 > shortGapJumpMeters)) {
+            return SegmentResult.rejectedBadJump();
+        }
+
+        double speedIntegralKm = 0.0;
+        if (previous.speedKmh() != null && current.speedKmh() != null
+                && Double.isFinite(previous.speedKmh()) && Double.isFinite(current.speedKmh())) {
+            speedIntegralKm = ((previous.speedKmh() + current.speedKmh()) / 2.0) * hours;
+        }
+        return new SegmentResult(gpsKm, speedIntegralKm, true, false, false, false);
+    }
+
+    private static double haversineKm(double lon1, double lat1, double lon2, double lat2) {
+        double latRad1 = Math.toRadians(lat1);
+        double latRad2 = Math.toRadians(lat2);
+        double deltaLat = Math.toRadians(lat2 - lat1);
+        double deltaLon = Math.toRadians(lon2 - lon1);
+        double a = Math.sin(deltaLat / 2.0) * Math.sin(deltaLat / 2.0)
+                + Math.cos(latRad1) * Math.cos(latRad2)
+                * Math.sin(deltaLon / 2.0) * Math.sin(deltaLon / 2.0);
+        return 2.0 * EARTH_RADIUS_KM * Math.asin(Math.min(1.0, Math.sqrt(a)));
+    }
+
+    public record SegmentResult(double gpsKm,
+                                double speedIntegralKm,
+                                boolean used,
+                                boolean badJump,
+                                boolean longGap,
+                                boolean outOfOrder) {
+        private static SegmentResult rejectedBadJump() {
+            return new SegmentResult(0.0, 0.0, false, true, false, false);
+        }
+
+        private static SegmentResult rejectedLongGap() {
+            return new SegmentResult(0.0, 0.0, false, false, true, false);
+        }
+
+        private static SegmentResult rejectedOutOfOrder() {
+            return new SegmentResult(0.0, 0.0, false, false, false, true);
+        }
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPoint.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPoint.java
@@ -0,0 +1,27 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import java.time.Instant;
+
+public record Jt808LocationPoint(
+        String vehicleKey,
+        String vin,
+        String phone,
+        Instant eventTime,
+        double longitude,
+        double latitude,
+        Double speedKmh,
+        Long statusFlag,
+        Double totalMileageKm
+) {
+
+    public Jt808LocationPoint {
+        if (vehicleKey == null || vehicleKey.isBlank()) {
+            throw new IllegalArgumentException("vehicleKey must not be blank");
+        }
+        if (eventTime == null) {
+            throw new IllegalArgumentException("eventTime must not be null");
+        }
+        vin = vin == null ? "" : vin;
+        phone = phone == null ? "" : phone;
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPointExtractor.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPointExtractor.java
@@ -0,0 +1,96 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import com.lingniu.ingest.sink.mq.proto.TelemetryField;
+import com.lingniu.ingest.sink.mq.proto.VehicleEnvelope;
+
+import java.time.Instant;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Optional;
+
+public final class Jt808LocationPointExtractor {
+
+    public Optional<Jt808LocationPoint> extract(VehicleEnvelope envelope) {
+        if (envelope == null
+                || !"JT808".equalsIgnoreCase(envelope.getSource())
+                || !envelope.hasTelemetrySnapshot()) {
+            return Optional.empty();
+        }
+        Map<String, String> fields = fields(envelope);
+        Double longitude = decimal(fields.get("longitude"));
+        Double latitude = decimal(fields.get("latitude"));
+        if (longitude == null || latitude == null || !validCoordinate(longitude, latitude)) {
+            return Optional.empty();
+        }
+
+        String vin = clean(envelope.getVin());
+        String phone = clean(envelope.getMetadataMap().getOrDefault("phone", ""));
+        String vehicleKey = vehicleKey(vin, phone);
+        if (vehicleKey.isBlank()) {
+            return Optional.empty();
+        }
+        return Optional.of(new Jt808LocationPoint(
+                vehicleKey,
+                vin,
+                phone,
+                Instant.ofEpochMilli(envelope.getEventTimeMs()),
+                longitude,
+                latitude,
+                decimal(fields.get("speed_kmh")),
+                integer(fields.get("location_status_raw")),
+                decimal(fields.get("total_mileage_km"))));
+    }
+
+    private static Map<String, String> fields(VehicleEnvelope envelope) {
+        Map<String, String> out = new LinkedHashMap<>();
+        for (TelemetryField field : envelope.getTelemetrySnapshot().getFieldsList()) {
+            if (!field.getKey().isBlank()) {
+                out.put(field.getKey(), field.getValue());
+            }
+        }
+        return out;
+    }
+
+    private static String vehicleKey(String vin, String phone) {
+        if (!vin.isBlank() && !"unknown".equalsIgnoreCase(vin)) {
+            return vin;
+        }
+        return phone.isBlank() ? "" : "jt808:" + phone;
+    }
+
+    private static boolean validCoordinate(double longitude, double latitude) {
+        return Double.isFinite(longitude)
+                && Double.isFinite(latitude)
+                && longitude >= -180.0
+                && longitude <= 180.0
+                && latitude >= -90.0
+                && latitude <= 90.0;
+    }
+
+    private static Double decimal(String raw) {
+        if (raw == null || raw.isBlank()) {
+            return null;
+        }
+        try {
+            double value = Double.parseDouble(raw);
+            return Double.isFinite(value) ? value : null;
+        } catch (NumberFormatException ignored) {
+            return null;
+        }
+    }
+
+    private static Long integer(String raw) {
+        if (raw == null || raw.isBlank()) {
+            return null;
+        }
+        try {
+            return Long.parseLong(raw);
+        } catch (NumberFormatException ignored) {
+            return null;
+        }
+    }
+
+    private static String clean(String value) {
+        return value == null ? "" : value.trim();
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStateStore.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStateStore.java
@@ -0,0 +1,11 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import java.time.LocalDate;
+import java.util.Optional;
+
+public interface Jt808MileageStateStore {
+
+    Optional<Jt808DailyMileageState> load(String vehicleKey, LocalDate statDate);
+
+    void save(Jt808DailyMileageState state);
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStreamProcessor.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStreamProcessor.java
@@ -0,0 +1,41 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import com.lingniu.ingest.sink.mq.proto.VehicleEnvelope;
+
+import java.time.LocalDate;
+import java.time.ZoneId;
+
+public final class Jt808MileageStreamProcessor {
+
+    private final Jt808LocationPointExtractor extractor;
+    private final Jt808GpsMileageCalculator calculator;
+    private final Jt808MileageStateStore stateStore;
+    private final Jt808DailyMileageRepository repository;
+    private final ZoneId zoneId;
+
+    public Jt808MileageStreamProcessor(
+            Jt808LocationPointExtractor extractor,
+            Jt808GpsMileageCalculator calculator,
+            Jt808MileageStateStore stateStore,
+            Jt808DailyMileageRepository repository,
+            ZoneId zoneId) {
+        this.extractor = extractor;
+        this.calculator = calculator;
+        this.stateStore = stateStore;
+        this.repository = repository;
+        this.zoneId = zoneId;
+    }
+
+    public synchronized void process(VehicleEnvelope envelope) {
+        extractor.extract(envelope).ifPresent(this::processPoint);
+    }
+
+    private void processPoint(Jt808LocationPoint point) {
+        LocalDate statDate = LocalDate.ofInstant(point.eventTime(), zoneId);
+        Jt808DailyMileageState state = stateStore.load(point.vehicleKey(), statDate)
+                .orElseGet(() -> Jt808DailyMileageState.empty(point.vehicleKey(), point.vin(), point.phone(), statDate));
+        state.apply(point, calculator);
+        stateStore.save(state);
+        repository.upsert(state.toResult());
+    }
+}
--- a/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/RedisJt808MileageStateStore.java
+++ b/modules/services/vehicle-stat-service/src/main/java/com/lingniu/ingest/vehiclestat/jt808/RedisJt808MileageStateStore.java
@@ -0,0 +1,167 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.data.redis.core.StringRedisTemplate;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.util.Optional;
+
+public final class RedisJt808MileageStateStore implements Jt808MileageStateStore {
+
+    private final StringRedisTemplate redis;
+    private final ObjectMapper objectMapper;
+    private final String keyPrefix;
+    private final Duration ttl;
+
+    public RedisJt808MileageStateStore(
+            StringRedisTemplate redis,
+            ObjectMapper objectMapper,
+            String keyPrefix,
+            Duration ttl) {
+        this.redis = redis;
+        this.objectMapper = objectMapper;
+        this.keyPrefix = keyPrefix;
+        this.ttl = ttl;
+    }
+
+    @Override
+    public Optional<Jt808DailyMileageState> load(String vehicleKey, LocalDate statDate) {
+        String json = redis.opsForValue().get(key(vehicleKey, statDate));
+        if (json == null || json.isBlank()) {
+            return Optional.empty();
+        }
+        try {
+            return Optional.of(objectMapper.readValue(json, StateSnapshot.class).toState());
+        } catch (JsonProcessingException e) {
+            throw new IllegalStateException("Failed to deserialize JT808 mileage state", e);
+        }
+    }
+
+    @Override
+    public void save(Jt808DailyMileageState state) {
+        try {
+            redis.opsForValue().set(key(state.vehicleKey(), state.statDate()),
+                    objectMapper.writeValueAsString(StateSnapshot.from(state)), ttl);
+        } catch (JsonProcessingException e) {
+            throw new IllegalStateException("Failed to serialize JT808 mileage state", e);
+        }
+    }
+
+    private String key(String vehicleKey, LocalDate statDate) {
+        return keyPrefix + statDate + ":" + vehicleKey;
+    }
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    record StateSnapshot(
+            String vehicleKey,
+            String vin,
+            String phone,
+            String statDate,
+            String firstEventTime,
+            String lastEventTime,
+            PointSnapshot lastPoint,
+            double lastTotalMileageKm,
+            double gpsMileageKm,
+            double speedIntegralKm,
+            double odometerMileageKm,
+            int acceptedPoints,
+            int badJumpSegments,
+            int longGapSegments,
+            int outOfOrderPoints,
+            int odometerAnomalies) {
+
+        static StateSnapshot from(Jt808DailyMileageState state) {
+            return new StateSnapshot(
+                    state.vehicleKey(),
+                    state.vin(),
+                    state.phone(),
+                    state.statDate().toString(),
+                    format(state.firstEventTime()),
+                    format(state.lastEventTime()),
+                    PointSnapshot.from(state.lastPoint()),
+                    state.lastTotalMileageKm(),
+                    state.gpsMileageKm(),
+                    state.speedIntegralKm(),
+                    state.odometerMileageKm(),
+                    state.acceptedPoints(),
+                    state.badJumpSegments(),
+                    state.longGapSegments(),
+                    state.outOfOrderPoints(),
+                    state.odometerAnomalies());
+        }
+
+        Jt808DailyMileageState toState() {
+            return Jt808DailyMileageState.restore(
+                    vehicleKey,
+                    vin,
+                    phone,
+                    LocalDate.parse(statDate),
+                    parseInstant(firstEventTime),
+                    parseInstant(lastEventTime),
+                    lastPoint == null ? null : lastPoint.toPoint(),
+                    lastTotalMileageKm,
+                    gpsMileageKm,
+                    speedIntegralKm,
+                    odometerMileageKm,
+                    acceptedPoints,
+                    badJumpSegments,
+                    longGapSegments,
+                    outOfOrderPoints,
+                    odometerAnomalies);
+        }
+    }
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    record PointSnapshot(
+            String vehicleKey,
+            String vin,
+            String phone,
+            String eventTime,
+            double longitude,
+            double latitude,
+            Double speedKmh,
+            Long statusFlag,
+            Double totalMileageKm) {
+
+        static PointSnapshot from(Jt808LocationPoint point) {
+            if (point == null) {
+                return null;
+            }
+            return new PointSnapshot(
+                    point.vehicleKey(),
+                    point.vin(),
+                    point.phone(),
+                    format(point.eventTime()),
+                    point.longitude(),
+                    point.latitude(),
+                    point.speedKmh(),
+                    point.statusFlag(),
+                    point.totalMileageKm());
+        }
+
+        Jt808LocationPoint toPoint() {
+            return new Jt808LocationPoint(
+                    vehicleKey,
+                    vin,
+                    phone,
+                    Instant.parse(eventTime),
+                    longitude,
+                    latitude,
+                    speedKmh,
+                    statusFlag,
+                    totalMileageKm);
+        }
+    }
+
+    private static String format(Instant instant) {
+        return instant == null ? null : instant.toString();
+    }
+
+    private static Instant parseInstant(String value) {
+        return value == null || value.isBlank() ? null : Instant.parse(value);
+    }
+}
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/VehicleStatEnvelopeIngestorTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/VehicleStatEnvelopeIngestorTest.java
@@ -6,6 +6,7 @@ import com.lingniu.ingest.sink.mq.proto.RawArchiveRef;
 import com.lingniu.ingest.sink.mq.proto.TelemetryField;
 import com.lingniu.ingest.sink.mq.proto.TelemetrySnapshot;
 import com.lingniu.ingest.sink.mq.proto.VehicleEnvelope;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808MileageStreamProcessor;
 import org.junit.jupiter.api.Test;

 import java.time.LocalDate;
@@ -14,6 +15,8 @@ import java.util.Optional;

 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;

 class VehicleStatEnvelopeIngestorTest {

@@ -31,6 +34,20 @@ class VehicleStatEnvelopeIngestorTest {
                .containsExactly(123.45);
    }

+    @Test
+    void fansOutTelemetryEnvelopeToOptionalJt808MileageProcessor() {
+        InMemoryVehicleStatRepository repository = new InMemoryVehicleStatRepository();
+        Jt808MileageStreamProcessor jt808Processor = mock(Jt808MileageStreamProcessor.class);
+        VehicleEnvelope envelope = envelope();
+        VehicleStatEnvelopeIngestor ingestor = new VehicleStatEnvelopeIngestor(
+                new VehicleStatEventProcessor(repository),
+                jt808Processor);
+
+        ingestor.ingest(envelope.toByteArray());
+
+        verify(jt808Processor).process(envelope);
+    }
+
    @Test
    void rejectsInvalidEnvelopeBytes() {
        VehicleStatEnvelopeIngestor ingestor =
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/config/VehicleStatAutoConfigurationTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/config/VehicleStatAutoConfigurationTest.java
@@ -14,15 +14,23 @@ import com.lingniu.ingest.vehiclestat.VehicleStatEventSink;
 import com.lingniu.ingest.vehiclestat.VehicleStatEventProcessor;
 import com.lingniu.ingest.vehiclestat.VehicleStatRepository;
 import com.lingniu.ingest.vehiclestat.VehicleStatRuleRepository;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808DailyMileageRepository;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808MileageStateStore;
+import com.lingniu.ingest.vehiclestat.jt808.Jt808MileageStreamProcessor;
+import com.lingniu.ingest.vehiclestat.jt808.RedisJt808MileageStateStore;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.jdbc.core.JdbcTemplate;

 import java.time.LocalDate;
 import java.util.List;
 import java.util.Optional;

 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;

 class VehicleStatAutoConfigurationTest {

@@ -74,6 +82,41 @@ class VehicleStatAutoConfigurationTest {
                });
    }

+    @Test
+    void createsJt808MileageBeansWhenEnabledWithJdbcAndRedis() {
+        contextRunner
+                .withBean(JdbcTemplate.class, () -> mock(JdbcTemplate.class))
+                .withBean(StringRedisTemplate.class, () -> mock(StringRedisTemplate.class))
+                .withBean(ObjectMapper.class, ObjectMapper::new)
+                .withPropertyValues(
+                        "lingniu.ingest.vehicle-stat.enabled=true",
+                        "lingniu.ingest.vehicle-stat.jt808.enabled=true",
+                        "lingniu.ingest.vehicle-stat.jt808.state-store=redis")
+                .run(context -> {
+                    assertThat(context).hasSingleBean(Jt808DailyMileageRepository.class);
+                    assertThat(context).hasSingleBean(Jt808MileageStateStore.class);
+                    assertThat(context).hasSingleBean(RedisJt808MileageStateStore.class);
+                    assertThat(context).hasSingleBean(Jt808MileageStreamProcessor.class);
+                    assertThat(context).hasSingleBean(VehicleStatEnvelopeIngestor.class);
+                });
+    }
+
+    @Test
+    void fallsBackToInMemoryJt808StateStoreWhenRedisIsNotSelected() {
+        contextRunner
+                .withBean(JdbcTemplate.class, () -> mock(JdbcTemplate.class))
+                .withPropertyValues(
+                        "lingniu.ingest.vehicle-stat.enabled=true",
+                        "lingniu.ingest.vehicle-stat.jt808.enabled=true",
+                        "lingniu.ingest.vehicle-stat.jt808.state-store=memory")
+                .run(context -> {
+                    assertThat(context).hasSingleBean(Jt808DailyMileageRepository.class);
+                    assertThat(context).hasSingleBean(Jt808MileageStateStore.class);
+                    assertThat(context).doesNotHaveBean(RedisJt808MileageStateStore.class);
+                    assertThat(context).hasSingleBean(Jt808MileageStreamProcessor.class);
+                });
+    }
+
    private static final class InMemoryVehicleStatRepository implements VehicleStatRepository {
        @Override public void appendMileagePoint(String vin, MileagePoint point) {}
        @Override public List<MileagePoint> mileagePoints(String vin, LocalDate statDate) { return List.of(); }
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/JdbcJt808DailyMileageRepositoryTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/JdbcJt808DailyMileageRepositoryTest.java
@@ -0,0 +1,102 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+
+import java.time.Instant;
+import java.time.LocalDate;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class JdbcJt808DailyMileageRepositoryTest {
+
+    private JdbcTemplate jdbc;
+    private JdbcJt808DailyMileageRepository repository;
+
+    @BeforeEach
+    void setUp() {
+        DriverManagerDataSource dataSource = new DriverManagerDataSource(
+                "jdbc:h2:mem:jt808_mileage;MODE=MySQL;DATABASE_TO_LOWER=TRUE;DB_CLOSE_DELAY=-1",
+                "sa",
+                "");
+        jdbc = new JdbcTemplate(dataSource);
+        jdbc.execute("drop table if exists vehicle_daily_mileage_jt808");
+        jdbc.execute("""
+                create table vehicle_daily_mileage_jt808 (
+                  stat_date date not null,
+                  vehicle_key varchar(64) not null,
+                  vin varchar(32) null,
+                  phone varchar(32) null,
+                  first_event_time timestamp null,
+                  last_event_time timestamp null,
+                  gps_mileage_km decimal(12,3) not null,
+                  speed_integral_km decimal(12,3) not null,
+                  odometer_mileage_km decimal(12,3) null,
+                  accepted_points int not null,
+                  bad_jump_segments int not null,
+                  long_gap_segments int not null,
+                  out_of_order_points int not null,
+                  odometer_anomalies int not null,
+                  data_quality varchar(16) not null,
+                  updated_at timestamp not null default current_timestamp,
+                  primary key (stat_date, vehicle_key)
+                )
+                """);
+        repository = new JdbcJt808DailyMileageRepository(jdbc);
+    }
+
+    @Test
+    void upsertsDailyMileageResult() {
+        Jt808DailyMileageResult first = new Jt808DailyMileageResult(
+                LocalDate.of(2026, 6, 30),
+                "VIN001",
+                "VIN001",
+                "13900000001",
+                Instant.parse("2026-06-30T00:00:00Z"),
+                Instant.parse("2026-06-30T00:01:00Z"),
+                1.23456,
+                1.2,
+                null,
+                2,
+                0,
+                0,
+                0,
+                0,
+                "GOOD");
+        Jt808DailyMileageResult updated = new Jt808DailyMileageResult(
+                LocalDate.of(2026, 6, 30),
+                "VIN001",
+                "VIN001",
+                "13900000001",
+                Instant.parse("2026-06-30T00:00:00Z"),
+                Instant.parse("2026-06-30T00:02:00Z"),
+                2.34567,
+                2.3,
+                2.0,
+                3,
+                1,
+                0,
+                0,
+                0,
+                "PARTIAL");
+
+        repository.upsert(first);
+        repository.upsert(updated);
+
+        Map<String, Object> row = jdbc.queryForMap("""
+                select vehicle_key, gps_mileage_km, odometer_mileage_km, accepted_points,
+                       bad_jump_segments, data_quality
+                from vehicle_daily_mileage_jt808
+                where stat_date = '2026-06-30' and vehicle_key = 'VIN001'
+                """);
+        assertThat(row.get("vehicle_key")).isEqualTo("VIN001");
+        assertThat(row.get("gps_mileage_km").toString()).isEqualTo("2.346");
+        assertThat(row.get("odometer_mileage_km").toString()).isEqualTo("2.000");
+        assertThat(row.get("accepted_points")).isEqualTo(3);
+        assertThat(row.get("bad_jump_segments")).isEqualTo(1);
+        assertThat(row.get("data_quality")).isEqualTo("PARTIAL");
+    }
+}
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageStateTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808DailyMileageStateTest.java
@@ -0,0 +1,89 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.data.Offset.offset;
+
+class Jt808DailyMileageStateTest {
+
+    private final Jt808GpsMileageCalculator calculator =
+            new Jt808GpsMileageCalculator(Duration.ofMinutes(5), 200.0, Duration.ofSeconds(10), 300.0);
+
+    @Test
+    void firstPointInitializesStateWithoutDistance() {
+        Jt808DailyMileageState state = Jt808DailyMileageState.empty("VIN001", "VIN001", "13900000001",
+                LocalDate.of(2026, 6, 30));
+
+        state.apply(point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0, 100.0), calculator);
+
+        assertThat(state.acceptedPoints()).isEqualTo(1);
+        assertThat(state.gpsMileageKm()).isZero();
+        assertThat(state.speedIntegralKm()).isZero();
+        assertThat(state.odometerMileageKm()).isZero();
+        assertThat(state.firstEventTime()).isEqualTo(Instant.parse("2026-06-30T00:00:00Z"));
+        assertThat(state.lastEventTime()).isEqualTo(Instant.parse("2026-06-30T00:00:00Z"));
+    }
+
+    @Test
+    void orderedPointUpdatesGpsSpeedAndOdometerMileage() {
+        Jt808DailyMileageState state = Jt808DailyMileageState.empty("VIN001", "VIN001", "13900000001",
+                LocalDate.of(2026, 6, 30));
+        state.apply(point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0, 100.0), calculator);
+
+        state.apply(point("2026-06-30T00:01:40Z", 120.010370, 30.000000, 36.0, 101.2), calculator);
+
+        assertThat(state.acceptedPoints()).isEqualTo(2);
+        assertThat(state.gpsMileageKm()).isBetween(0.99, 1.01);
+        assertThat(state.speedIntegralKm()).isBetween(0.99, 1.01);
+        assertThat(state.odometerMileageKm()).isCloseTo(1.2, offset(0.000001));
+        assertThat(state.badJumpSegments()).isZero();
+        assertThat(state.longGapSegments()).isZero();
+    }
+
+    @Test
+    void duplicateOrOlderPointIsIgnored() {
+        Jt808DailyMileageState state = Jt808DailyMileageState.empty("VIN001", "VIN001", "13900000001",
+                LocalDate.of(2026, 6, 30));
+        state.apply(point("2026-06-30T00:01:00Z", 120.000000, 30.000000, 36.0, 100.0), calculator);
+
+        state.apply(point("2026-06-30T00:00:59Z", 120.010370, 30.000000, 36.0, 101.0), calculator);
+
+        assertThat(state.acceptedPoints()).isEqualTo(1);
+        assertThat(state.outOfOrderPoints()).isEqualTo(1);
+        assertThat(state.gpsMileageKm()).isZero();
+    }
+
+    @Test
+    void odometerRollbackIsIgnoredAndCounted() {
+        Jt808DailyMileageState state = Jt808DailyMileageState.empty("VIN001", "VIN001", "13900000001",
+                LocalDate.of(2026, 6, 30));
+        state.apply(point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0, 100.0), calculator);
+
+        state.apply(point("2026-06-30T00:01:40Z", 120.010370, 30.000000, 36.0, 99.5), calculator);
+
+        assertThat(state.odometerMileageKm()).isZero();
+        assertThat(state.odometerAnomalies()).isEqualTo(1);
+    }
+
+    private static Jt808LocationPoint point(String time,
+                                           double longitude,
+                                           double latitude,
+                                           Double speedKmh,
+                                           Double totalMileageKm) {
+        return new Jt808LocationPoint(
+                "VIN001",
+                "VIN001",
+                "13900000001",
+                Instant.parse(time),
+                longitude,
+                latitude,
+                speedKmh,
+                3L,
+                totalMileageKm);
+    }
+}
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808GpsMileageCalculatorTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808GpsMileageCalculatorTest.java
@@ -0,0 +1,86 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+import java.time.Instant;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.data.Offset.offset;
+
+class Jt808GpsMileageCalculatorTest {
+
+    private final Jt808GpsMileageCalculator calculator =
+            new Jt808GpsMileageCalculator(Duration.ofMinutes(5), 200.0, Duration.ofSeconds(10), 300.0);
+
+    @Test
+    void accumulatesValidHaversineDistanceAndSpeedIntegral() {
+        var result = calculator.calculateSegment(
+                point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0),
+                point("2026-06-30T00:01:40Z", 120.010370, 30.000000, 36.0));
+
+        assertThat(result.used()).isTrue();
+        assertThat(result.gpsKm()).isCloseTo(1.0, offset(0.01));
+        assertThat(result.speedIntegralKm()).isCloseTo(1.0, offset(0.001));
+        assertThat(result.badJump()).isFalse();
+        assertThat(result.longGap()).isFalse();
+        assertThat(result.outOfOrder()).isFalse();
+    }
+
+    @Test
+    void rejectsNonPositiveTime() {
+        var result = calculator.calculateSegment(
+                point("2026-06-30T00:01:00Z", 120.000000, 30.000000, 36.0),
+                point("2026-06-30T00:01:00Z", 120.001000, 30.000000, 36.0));
+
+        assertThat(result.used()).isFalse();
+        assertThat(result.outOfOrder()).isTrue();
+        assertThat(result.gpsKm()).isZero();
+    }
+
+    @Test
+    void rejectsLongGap() {
+        var result = calculator.calculateSegment(
+                point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0),
+                point("2026-06-30T00:06:00Z", 120.001000, 30.000000, 36.0));
+
+        assertThat(result.used()).isFalse();
+        assertThat(result.longGap()).isTrue();
+        assertThat(result.gpsKm()).isZero();
+    }
+
+    @Test
+    void rejectsBadJumpByImpliedSpeed() {
+        var result = calculator.calculateSegment(
+                point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0),
+                point("2026-06-30T00:01:00Z", 120.100000, 30.000000, 36.0));
+
+        assertThat(result.used()).isFalse();
+        assertThat(result.badJump()).isTrue();
+        assertThat(result.gpsKm()).isZero();
+    }
+
+    @Test
+    void rejectsShortGapJumpByDistance() {
+        var result = calculator.calculateSegment(
+                point("2026-06-30T00:00:00Z", 120.000000, 30.000000, 36.0),
+                point("2026-06-30T00:00:05Z", 120.004000, 30.000000, 36.0));
+
+        assertThat(result.used()).isFalse();
+        assertThat(result.badJump()).isTrue();
+        assertThat(result.gpsKm()).isZero();
+    }
+
+    private static Jt808LocationPoint point(String time, double longitude, double latitude, Double speedKmh) {
+        return new Jt808LocationPoint(
+                "VIN001",
+                "VIN001",
+                "13900000001",
+                Instant.parse(time),
+                longitude,
+                latitude,
+                speedKmh,
+                3L,
+                null);
+    }
+}
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPointExtractorTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808LocationPointExtractorTest.java
@@ -0,0 +1,84 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import com.lingniu.ingest.sink.mq.proto.TelemetryField;
+import com.lingniu.ingest.sink.mq.proto.TelemetrySnapshot;
+import com.lingniu.ingest.sink.mq.proto.VehicleEnvelope;
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class Jt808LocationPointExtractorTest {
+
+    private final Jt808LocationPointExtractor extractor = new Jt808LocationPointExtractor();
+
+    @Test
+    void extractsJt808LocationPointWithVin() {
+        var point = extractor.extract(envelope("JT808", "VIN001", "13900000001",
+                field("longitude", "118.901034"),
+                field("latitude", "31.946325"),
+                field("speed_kmh", "52.3"),
+                field("location_status_raw", "3"),
+                field("total_mileage_km", "1234.5"))).orElseThrow();
+
+        assertThat(point.vehicleKey()).isEqualTo("VIN001");
+        assertThat(point.vin()).isEqualTo("VIN001");
+        assertThat(point.phone()).isEqualTo("13900000001");
+        assertThat(point.eventTime()).isEqualTo(Instant.ofEpochMilli(1_782_112_400_000L));
+        assertThat(point.longitude()).isEqualTo(118.901034);
+        assertThat(point.latitude()).isEqualTo(31.946325);
+        assertThat(point.speedKmh()).isEqualTo(52.3);
+        assertThat(point.statusFlag()).isEqualTo(3L);
+        assertThat(point.totalMileageKm()).isEqualTo(1234.5);
+    }
+
+    @Test
+    void usesPhoneFallbackWhenVinIsUnknown() {
+        var point = extractor.extract(envelope("JT808", "unknown", "40692934289",
+                field("longitude", "118.901034"),
+                field("latitude", "31.946325"))).orElseThrow();
+
+        assertThat(point.vehicleKey()).isEqualTo("jt808:40692934289");
+        assertThat(point.vin()).isEqualTo("unknown");
+        assertThat(point.phone()).isEqualTo("40692934289");
+    }
+
+    @Test
+    void ignoresNonJt808Envelope() {
+        assertThat(extractor.extract(envelope("GB32960", "VIN001", "",
+                field("longitude", "118.901034"),
+                field("latitude", "31.946325")))).isEmpty();
+    }
+
+    @Test
+    void ignoresEnvelopeWithoutCoordinates() {
+        assertThat(extractor.extract(envelope("JT808", "VIN001", "13900000001",
+                field("longitude", "118.901034")))).isEmpty();
+    }
+
+    private static VehicleEnvelope envelope(String source, String vin, String phone, TelemetryField... fields) {
+        TelemetrySnapshot.Builder snapshot = TelemetrySnapshot.newBuilder().setEventType("LOCATION");
+        for (TelemetryField field : fields) {
+            snapshot.addFields(field);
+        }
+        return VehicleEnvelope.newBuilder()
+                .setEventId("event-1")
+                .setVin(vin)
+                .setSource(source)
+                .putMetadata("phone", phone)
+                .setEventTimeMs(1_782_112_400_000L)
+                .setIngestTimeMs(1_782_112_401_000L)
+                .setTelemetrySnapshot(snapshot)
+                .build();
+    }
+
+    private static TelemetryField field(String key, String value) {
+        return TelemetryField.newBuilder()
+                .setKey(key)
+                .setValueType("DOUBLE")
+                .setValue(value)
+                .setQuality("GOOD")
+                .build();
+    }
+}
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStreamProcessorTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/Jt808MileageStreamProcessorTest.java
@@ -0,0 +1,95 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import com.lingniu.ingest.sink.mq.proto.TelemetryField;
+import com.lingniu.ingest.sink.mq.proto.TelemetrySnapshot;
+import com.lingniu.ingest.sink.mq.proto.VehicleEnvelope;
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class Jt808MileageStreamProcessorTest {
+
+    @Test
+    void updatesDailyStateAndUpsertsResultForJt808Points() {
+        InMemoryJt808MileageStateStore stateStore = new InMemoryJt808MileageStateStore();
+        CapturingRepository repository = new CapturingRepository();
+        Jt808MileageStreamProcessor processor = processor(stateStore, repository);
+
+        processor.process(envelope("2026-06-30T00:00:00Z", 120.0, 30.0, 100.0));
+        processor.process(envelope("2026-06-30T00:01:00Z", 120.01, 30.0, 101.0));
+
+        Jt808DailyMileageState state = stateStore.load("VIN001", LocalDate.of(2026, 6, 30)).orElseThrow();
+        assertThat(state.acceptedPoints()).isEqualTo(2);
+        assertThat(state.gpsMileageKm()).isGreaterThan(0.9);
+        assertThat(repository.results).hasSize(2);
+        assertThat(repository.results.getLast().vehicleKey()).isEqualTo("VIN001");
+        assertThat(repository.results.getLast().odometerMileageKm()).isEqualTo(1.0);
+    }
+
+    @Test
+    void skipsNonJt808Envelope() {
+        CapturingRepository repository = new CapturingRepository();
+        Jt808MileageStreamProcessor processor = processor(new InMemoryJt808MileageStateStore(), repository);
+        VehicleEnvelope envelope = envelope("2026-06-30T00:00:00Z", 120.0, 30.0, 100.0)
+                .toBuilder()
+                .setSource("GB32960")
+                .build();
+
+        processor.process(envelope);
+
+        assertThat(repository.results).isEmpty();
+    }
+
+    private static Jt808MileageStreamProcessor processor(
+            Jt808MileageStateStore stateStore,
+            Jt808DailyMileageRepository repository) {
+        return new Jt808MileageStreamProcessor(
+                new Jt808LocationPointExtractor(),
+                new Jt808GpsMileageCalculator(Duration.ofMinutes(5), 200.0, Duration.ofSeconds(10), 300.0),
+                stateStore,
+                repository,
+                ZoneId.of("Asia/Shanghai"));
+    }
+
+    private static VehicleEnvelope envelope(String eventTime, double longitude, double latitude, double totalMileageKm) {
+        long eventTimeMs = Instant.parse(eventTime).toEpochMilli();
+        return VehicleEnvelope.newBuilder()
+                .setEventId("event-" + eventTimeMs)
+                .setVin("VIN001")
+                .setSource("JT808")
+                .setEventTimeMs(eventTimeMs)
+                .putMetadata("phone", "13900000001")
+                .setTelemetrySnapshot(TelemetrySnapshot.newBuilder()
+                        .setEventType("LOCATION")
+                        .addFields(field("longitude", longitude))
+                        .addFields(field("latitude", latitude))
+                        .addFields(field("speed_kmh", 36.0))
+                        .addFields(field("total_mileage_km", totalMileageKm)))
+                .build();
+    }
+
+    private static TelemetryField field(String key, double value) {
+        return TelemetryField.newBuilder()
+                .setKey(key)
+                .setValueType("DOUBLE")
+                .setValue(Double.toString(value))
+                .setQuality("GOOD")
+                .build();
+    }
+
+    private static final class CapturingRepository implements Jt808DailyMileageRepository {
+        private final List<Jt808DailyMileageResult> results = new ArrayList<>();
+
+        @Override
+        public void upsert(Jt808DailyMileageResult result) {
+            results.add(result);
+        }
+    }
+}
--- a/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/RedisJt808MileageStateStoreTest.java
+++ b/modules/services/vehicle-stat-service/src/test/java/com/lingniu/ingest/vehiclestat/jt808/RedisJt808MileageStateStoreTest.java
@@ -0,0 +1,86 @@
+package com.lingniu.ingest.vehiclestat.jt808;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.core.ValueOperations;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+class RedisJt808MileageStateStoreTest {
+
+    @Test
+    void savesStateAsJsonWithTtl() {
+        StringRedisTemplate redis = mock(StringRedisTemplate.class);
+        @SuppressWarnings("unchecked")
+        ValueOperations<String, String> values = mock(ValueOperations.class);
+        when(redis.opsForValue()).thenReturn(values);
+        RedisJt808MileageStateStore store = new RedisJt808MileageStateStore(
+                redis, new ObjectMapper(), "vehicle:mileage:jt808:daily:", Duration.ofDays(3));
+        Jt808DailyMileageState state = Jt808DailyMileageState.empty("VIN001", "VIN001", "13900000001",
+                LocalDate.of(2026, 6, 30));
+        state.apply(point("2026-06-30T00:00:00Z"), calculator());
+
+        store.save(state);
+
+        verify(values).set(
+                org.mockito.ArgumentMatchers.eq("vehicle:mileage:jt808:daily:2026-06-30:VIN001"),
+                org.mockito.ArgumentMatchers.contains("\"vehicleKey\":\"VIN001\""),
+                org.mockito.ArgumentMatchers.eq(Duration.ofDays(3)));
+    }
+
+    @Test
+    void loadsStateFromJson() {
+        StringRedisTemplate redis = mock(StringRedisTemplate.class);
+        @SuppressWarnings("unchecked")
+        ValueOperations<String, String> values = mock(ValueOperations.class);
+        when(redis.opsForValue()).thenReturn(values);
+        when(values.get("vehicle:mileage:jt808:daily:2026-06-30:VIN001"))
+                .thenReturn("""
+                        {"vehicleKey":"VIN001","vin":"VIN001","phone":"13900000001","statDate":"2026-06-30",
+                         "firstEventTime":"2026-06-30T00:00:00Z","lastEventTime":"2026-06-30T00:01:00Z",
+                         "lastPoint":{"vehicleKey":"VIN001","vin":"VIN001","phone":"13900000001",
+                           "eventTime":"2026-06-30T00:01:00Z","longitude":120.0,"latitude":30.0,
+                           "speedKmh":36.0,"statusFlag":3,"totalMileageKm":101.0},
+                         "lastTotalMileageKm":101.0,"gpsMileageKm":1.0,"speedIntegralKm":1.0,
+                         "odometerMileageKm":1.0,"acceptedPoints":2,"badJumpSegments":0,
+                         "longGapSegments":0,"outOfOrderPoints":0,"odometerAnomalies":0}
+                        """);
+        RedisJt808MileageStateStore store = new RedisJt808MileageStateStore(
+                redis, new ObjectMapper(), "vehicle:mileage:jt808:daily:", Duration.ofDays(3));
+
+        Optional<Jt808DailyMileageState> loaded = store.load("VIN001", LocalDate.of(2026, 6, 30));
+
+        assertThat(loaded).hasValueSatisfying(state -> {
+            assertThat(state.vehicleKey()).isEqualTo("VIN001");
+            assertThat(state.acceptedPoints()).isEqualTo(2);
+            assertThat(state.gpsMileageKm()).isEqualTo(1.0);
+            assertThat(state.lastEventTime()).isEqualTo(Instant.parse("2026-06-30T00:01:00Z"));
+        });
+    }
+
+    private static Jt808GpsMileageCalculator calculator() {
+        return new Jt808GpsMileageCalculator(Duration.ofMinutes(5), 200.0, Duration.ofSeconds(10), 300.0);
+    }
+
+    private static Jt808LocationPoint point(String time) {
+        return new Jt808LocationPoint(
+                "VIN001",
+                "VIN001",
+                "13900000001",
+                Instant.parse(time),
+                120.0,
+                30.0,
+                36.0,
+                3L,
+                100.0);
+    }
+}