54 lines
1.9 KiB
MySQL
54 lines
1.9 KiB
MySQL
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-- migrate:up
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--
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-- Continuous day track for a vehicle: one GeoJSON LineString of every fix in
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-- the EAT day, in time order. serve.fn_vehicle_trips returns each trip as its
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-- own ST_MakeLine, so on the map a day with reporting-gap trip splits reads as
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-- several disconnected segments. The frontend draws this track as a faint base
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-- line under the coloured per-trip segments, so the route looks like one
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-- continuous drive while individual trips stay highlighted.
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--
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-- EAT day boundary matches serve.fn_vehicle_trips (UTC+3). Light ST_Simplify
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-- (~3 m) trims redundant points to keep the payload small without visibly
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-- changing the shape. Returns NULL when there are fewer than 2 fixes.
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CREATE OR REPLACE FUNCTION serve.fn_vehicle_day_track(
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p_vehicle_id bigint,
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p_date_eat date
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) RETURNS jsonb
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LANGUAGE sql STABLE
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AS $$
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WITH bounds AS (
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SELECT (p_date_eat::timestamp - interval '3 hours') AT TIME ZONE 'UTC' AS day_start
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),
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-- Use one device's fixes (tracker-first, same canonical pick as
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-- fn_vehicle_trips) so a camera-paired vehicle's track doesn't zig-zag
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-- between the tracker and camera positions.
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primary_imei AS (
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SELECT d.imei
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FROM domain.devices d
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WHERE d.vehicle_id = p_vehicle_id
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ORDER BY CASE d.device_type WHEN 'tracker' THEN 0 ELSE 1 END, d.imei
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LIMIT 1
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),
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pts AS (
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SELECT ph.geom, ph.occurred_at
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FROM state.position_history ph, bounds b, primary_imei pi
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WHERE ph.vehicle_id = p_vehicle_id
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AND ph.imei = pi.imei
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AND ph.occurred_at >= b.day_start
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AND ph.occurred_at < b.day_start + interval '24 hours'
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)
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SELECT CASE
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WHEN count(*) >= 2
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THEN ST_AsGeoJSON(
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ST_Simplify(ST_MakeLine(geom ORDER BY occurred_at), 0.00003)
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)::jsonb
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ELSE NULL
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END
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FROM pts;
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$$;
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-- migrate:down
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DROP FUNCTION IF EXISTS serve.fn_vehicle_day_track(bigint, date);
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