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Migration: serve._label_short() extracts plate-tail (handles 'Driver - KDW 573B_cam' patterns)
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kianiadee 2026-05-23 23:11:20 +03:00
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commit 2b428e8058
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db/migrations/20260601000012_label_short_from_plate.sql Normal file
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-- migrate:up
--
-- device_name from Tracksolid encodes both driver and plate in one field,
-- with patterns like:
-- "John Mbugua - KDW 573B_cam" → driver "John Mbugua", plate "KDW 573B"
-- "Parked - KMGK 596V" → no driver, plate "KMGK 596V"
-- "JC400P-92732" → no driver/plate, device serial
-- "865135061562722" → bare IMEI fallback
--
-- For the marker label we want the last 4 chars of the *plate* portion, not
-- "_cam" / "_CAM" suffix or driver-name tail. Build a helper that:
-- 1. drops trailing "_cam" / "_CAM"
-- 2. strips everything up to and including the last " - " separator
-- 3. takes the last 4 chars
CREATE OR REPLACE FUNCTION serve._label_short(device_name text, plate text)
RETURNS text
LANGUAGE sql IMMUTABLE AS $$
SELECT right(
regexp_replace(
regexp_replace(
COALESCE(NULLIF(device_name, ''), plate, ''),
'_(cam|CAM)$', ''
),
'^.* - ', ''
),
4
)
$$;
DROP FUNCTION IF EXISTS serve.fn_live_view(jsonb);
CREATE OR REPLACE FUNCTION serve.fn_live_view(filters jsonb)
RETURNS jsonb
LANGUAGE plpgsql STABLE
AS $$
DECLARE
fresh_window interval := COALESCE((filters->>'fresh_window')::interval, interval '24 hours');
offline_after interval := COALESCE((filters->>'offline_after')::interval, interval '5 minutes');
move_speed_kmh numeric := COALESCE((filters->>'move_speed_kmh')::numeric, 5);
p_cost_centre text := filters->>'cost_centre';
p_assigned_city text := filters->>'assigned_city';
p_vehicle_numbers text[] := CASE
WHEN filters ? 'vehicle_numbers'
THEN ARRAY(SELECT jsonb_array_elements_text(filters->'vehicle_numbers'))
ELSE NULL
END;
result jsonb;
BEGIN
WITH candidates AS (
SELECT
lp.imei, lp.occurred_at, lp.geom, lp.speed_kmh, lp.direction_deg,
lp.mc_type, lp.current_mileage_km, lp.gps_signal, lp.satellites,
lp.device_name, lp.pos_type,
d.device_type, d.activation_at,
v.vehicle_id, v.plate, v.cost_centre, v.assigned_city
FROM state.live_positions lp
JOIN domain.devices d ON d.imei = lp.imei
JOIN domain.vehicles v ON v.vehicle_id = d.vehicle_id
WHERE d.lifecycle = 'active'
AND (p_cost_centre IS NULL OR v.cost_centre = p_cost_centre)
AND (p_assigned_city IS NULL OR v.assigned_city = p_assigned_city)
AND (p_vehicle_numbers IS NULL OR v.plate = ANY (p_vehicle_numbers))
),
ranked AS (
SELECT c.*, ROW_NUMBER() OVER (
PARTITION BY c.vehicle_id
ORDER BY
CASE c.device_type WHEN 'tracker' THEN 0 ELSE 1 END,
CASE WHEN c.occurred_at > now() - fresh_window THEN 0 ELSE 1 END,
c.occurred_at DESC,
c.activation_at DESC NULLS LAST
) AS rn
FROM candidates c
),
deduped AS (SELECT * FROM ranked WHERE rn = 1),
enriched AS (
SELECT d.*,
CASE
WHEN d.occurred_at <= now() - offline_after THEN 'offline'
WHEN d.speed_kmh IS NOT NULL AND d.speed_kmh > move_speed_kmh THEN 'moving'
ELSE 'parked'
END AS operational_state,
serve._cost_centre_color(d.cost_centre) AS cost_centre_color,
EXTRACT(EPOCH FROM (now() - d.occurred_at))::int AS age_sec,
round(ST_Y(d.geom)::numeric, 4) AS lat_rounded,
round(ST_X(d.geom)::numeric, 4) AS lng_rounded
FROM deduped d
),
with_addr AS (
SELECT e.*, g.address, g.address_short
FROM enriched e
LEFT JOIN state.geocoded_positions g
ON g.lat_rounded = e.lat_rounded
AND g.lng_rounded = e.lng_rounded
),
summary AS (
SELECT jsonb_build_object(
'total_active', count(*),
'moving', count(*) FILTER (WHERE operational_state = 'moving'),
'parked', count(*) FILTER (WHERE operational_state = 'parked'),
'offline', count(*) FILTER (WHERE operational_state = 'offline'),
'below_freshness_slo', count(*) FILTER (
WHERE occurred_at <= now() - interval '90 seconds'
),
'as_of', to_char(now() AT TIME ZONE 'UTC', 'YYYY-MM-DD"T"HH24:MI:SS"Z"')
) AS s
FROM with_addr
),
features AS (
SELECT COALESCE(jsonb_agg(
jsonb_build_object(
'type', 'Feature',
'geometry', ST_AsGeoJSON(e.geom)::jsonb,
'properties', jsonb_build_object(
'vehicle_id', e.vehicle_id,
'plate', e.plate,
'plate_short', serve._label_short(e.device_name, e.plate),
'imei', e.imei,
'device_type', e.device_type,
'device_name', e.device_name,
'mc_type', e.mc_type,
'pos_type', e.pos_type,
'cost_centre', e.cost_centre,
'cost_centre_color', e.cost_centre_color,
'assigned_city', e.assigned_city,
'address', e.address,
'address_short', e.address_short,
'occurred_at', to_char(e.occurred_at AT TIME ZONE 'UTC', 'YYYY-MM-DD"T"HH24:MI:SS"Z"'),
'age_sec', e.age_sec,
'speed_kmh', e.speed_kmh,
'heading_deg', e.direction_deg,
'gps_signal', e.gps_signal,
'satellites', e.satellites,
'current_mileage_km', e.current_mileage_km,
'operational_state', e.operational_state,
'style_class', 'vehicle-' || e.operational_state,
'marker_color', CASE WHEN e.operational_state = 'moving'
THEN e.cost_centre_color
ELSE '#9ca3af' END,
'show_arrow', (e.operational_state = 'moving' AND e.direction_deg IS NOT NULL)
)
)
), '[]'::jsonb) AS feats
FROM with_addr e
),
slo_block AS (
SELECT COALESCE(jsonb_object_agg(
metric,
jsonb_build_object('threshold', threshold, 'current', current_value, 'status', status)
), '{}'::jsonb) AS ss
FROM slo.v_current_status
)
SELECT jsonb_build_object(
'summary', (SELECT s FROM summary),
'geojson', jsonb_build_object('type', 'FeatureCollection', 'features', (SELECT feats FROM features)),
'slo_status', (SELECT ss FROM slo_block)
)
INTO result;
RETURN result;
END;
$$;
-- migrate:down
DROP FUNCTION IF EXISTS serve.fn_live_view(jsonb);
DROP FUNCTION IF EXISTS serve._label_short(text, text);