Calibrated against a full-day legacy report for vehicle KDE 638J:
without this rule we collapsed 15 dispatcher-visible trips into 3
(the algorithm waited for explicit ACC_OFF + stationary fixes that never
came in the polled data — the device just stops reporting between trips).
New rule: if mid-trip and the next fix arrives >=5 min after the previous
one (but <=30 min, which is still long_gap), close the trip at the prior
fix with end_reason='nofix_stop'.
Validation:
638J full day: legacy 15 trips, mine 15 trips, perfect alignment
728K half day: legacy 33 noisy trips, mine 9 clean trips
(stop-and-go traffic still consolidates because fixes
keep coming, just slow/stationary — not silence)
Also commits scripts/simulate_trips_from_legacy.py which runs the same
state machine in Python against REPORTS/*.json dumps for offline tuning.
Migration 19: serve.fn_vehicle_trips(vehicle_id, date) — PL/pgSQL state
machine that walks state.position_history for one vehicle on one EAT day
and emits the trip breakdown. Rules:
- reporting_time = first ACC_ON of the day
- trip starts at ACC_ON (or first fix if already ACC_ON / moving)
- trip ends:
* ACC_OFF + stationary (<5 km/h) for >=5 min → end_reason 'work_stop'
* fix gap >30 min → end_reason 'long_gap'
* end of day's data → end_reason 'day_end'
- within a trip, ACC_ON + stationary >=5 min is logged as an idling
segment (no trip split — engine still on)
- distance only accumulates when speed >= 5 km/h (excludes GPS jitter)
- falls back to movement-only segmentation when acc_state is null
across the day (has_acc_data=false in the response)
Returns one jsonb document: vehicle, date, reporting_time, day totals
(distance, driving/idling/stopped/unknown minutes), data_quality flags,
trips[] with start/end/duration/distance/idling/end_reason/stops/path
where path is a GeoJSON LineString ready for the map.
New endpoints (read:fleet, rate-limited):
GET /api/views/vehicle/{id}/trips?date=YYYY-MM-DD JSON
GET /api/views/vehicle/{id}/trips.csv?date=YYYY-MM-DD one row per trip
Defaults date to today in EAT (UTC+3) regardless of host TZ.
