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chore: enforce kafka-only stat path

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lingniu
2026-07-01 14:35:58 +08:00
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docs/operations/jt808-daily-mileage-runbook.md
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The analytics app can calculate daily mileage from JT808 telemetry only. It consumes `vehicle.event.jt808.v1` and saves the current daily result into the common `vehicle-stat` metric repository.
Only supported message backbone: Kafka.
## Storage
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.