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docs: simplify jt808 mileage runtime state

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lingniu
2026-07-01 13:29:08 +08:00
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commit cea8ceeabe
3 changed files with 31 additions and 9 deletions
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docs/operations/jt808-daily-mileage-runbook.md
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@@ -6,7 +6,7 @@ The analytics app can calculate daily mileage from JT808 telemetry only. It cons
## Storage
There is no separate JT808 daily-mileage table and no Redis mileage state. The derived value is stored as one `daily_mileage_km` metric row in the common JDBC/MySQL table `vehicle_stat_metric`; the local-day minimum and maximum GPS total mileage values are kept on that same row as calculation source columns.
Runtime state: none outside `vehicle_stat_metric`. There is no separate JT808 daily-mileage table. The derived value is stored as one `daily_mileage_km` metric row in the common JDBC/MySQL table `vehicle_stat_metric`; the local-day minimum and maximum GPS total mileage values are kept on that same row as calculation source columns.
The JT808 daily-mileage value is calculated from the GPS total mileage reported in location additional information:
@@ -29,4 +29,4 @@ MYSQL_USERNAME=<user>
MYSQL_PASSWORD=<password>
```
Algorithm defaults use the Asia/Shanghai daily boundary. Restart recovery reads the same `daily_mileage_km` metric row, so no separate mileage state store is required.
Algorithm defaults use the Asia/Shanghai daily boundary. Restart recovery reads the same `daily_mileage_km` metric row.