83 lines
2.9 KiB
MySQL
83 lines
2.9 KiB
MySQL
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-- migrate:up
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--
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-- One-shot plate consolidation:
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-- 1. extract plate from each device's device_name (post " - ", strip _cam)
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-- 2. for each plate appearing on >1 device (tracker+camera pair), pick the
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-- lowest existing vehicle_id as canonical
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-- 3. remap state.position_history, state.live_positions, domain.devices
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-- to the canonical vehicle_id
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-- 4. delete orphaned vehicle rows
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-- 5. update canonical vehicles' plate to the extracted plate
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--
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-- After this runs, domain.vehicles holds one row per physical plate. The
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-- PRD F1.6 dedup rule in serve.fn_live_view picks tracker-first when both
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-- a tracker and camera report for the same vehicle.
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--
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-- Idempotent: re-running the migration only updates plates that have moved on.
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DO $migration$
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BEGIN
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CREATE TEMP TABLE _plate_map ON COMMIT DROP AS
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SELECT
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d.imei,
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d.vehicle_id AS current_vehicle_id,
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regexp_replace(
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(regexp_match(lp.device_name, '^.* - (.+)$'))[1],
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'_(cam|CAM)$', ''
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) AS new_plate
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FROM domain.devices d
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JOIN state.live_positions lp ON lp.imei = d.imei
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WHERE lp.device_name LIKE '% - %';
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DELETE FROM _plate_map
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WHERE new_plate IS NULL
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OR new_plate = ''
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OR new_plate !~ '[A-Z]'
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OR new_plate !~ '[0-9]';
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CREATE TEMP TABLE _canonical ON COMMIT DROP AS
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SELECT new_plate, min(current_vehicle_id) AS canonical_vehicle_id
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FROM _plate_map
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GROUP BY new_plate;
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-- Drop UNIQUE so the multi-row plate assignment doesn't transiently violate
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ALTER TABLE domain.vehicles DROP CONSTRAINT IF EXISTS vehicles_plate_key;
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UPDATE state.position_history ph
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SET vehicle_id = c.canonical_vehicle_id
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FROM _plate_map pm
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JOIN _canonical c ON c.new_plate = pm.new_plate
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WHERE ph.imei = pm.imei
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AND ph.vehicle_id != c.canonical_vehicle_id;
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UPDATE state.live_positions lp
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SET vehicle_id = c.canonical_vehicle_id
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FROM _plate_map pm
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JOIN _canonical c ON c.new_plate = pm.new_plate
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WHERE lp.imei = pm.imei
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AND lp.vehicle_id != c.canonical_vehicle_id;
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UPDATE domain.devices d
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SET vehicle_id = c.canonical_vehicle_id
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FROM _plate_map pm
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JOIN _canonical c ON c.new_plate = pm.new_plate
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WHERE d.imei = pm.imei
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AND d.vehicle_id != c.canonical_vehicle_id;
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DELETE FROM domain.vehicles v
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WHERE NOT EXISTS (SELECT 1 FROM domain.devices d WHERE d.vehicle_id = v.vehicle_id)
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AND NOT EXISTS (SELECT 1 FROM state.live_positions lp WHERE lp.vehicle_id = v.vehicle_id)
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AND NOT EXISTS (SELECT 1 FROM state.position_history ph WHERE ph.vehicle_id = v.vehicle_id);
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UPDATE domain.vehicles v
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SET plate = c.new_plate, updated_at = now()
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FROM _canonical c
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WHERE v.vehicle_id = c.canonical_vehicle_id;
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ALTER TABLE domain.vehicles ADD CONSTRAINT vehicles_plate_key UNIQUE (plate);
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END
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$migration$;
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-- migrate:down
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-- No-op: plate consolidation is a one-way operation.
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