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54 lines
2.2 KiB
TypeScript
54 lines
2.2 KiB
TypeScript
import { MigrationInterface, QueryRunner } from 'typeorm';
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/**
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* Wagon spec belongs to the wagon TYPE, not to each physical wagon.
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*
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* `wagons.tare_weight` and `wagons.max_payload_weight` duplicated
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* `wagon_types.tare_weight_tons` / `wagon_types.capacity_tons` on all 1100 rows,
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* with nothing keeping them in step. They had drifted completely: every wagon
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* disagreed with its type's tare (seeded ~20T against a real 22.4T NW5), and a
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* third disagreed on payload (NW5 wagons claiming 22T–70T against a flat 70T).
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* None of those numbers came from the railway.
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*
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* Nothing reads them for capacity — that math resolves tare and capacity through
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* `wagon_type_id` — so dropping them removes a source of fiction rather than a
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* source of truth. `wagon_type_id` is NOT NULL with no orphans, so the type is
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* always reachable.
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*
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* A wagon re-tared after repair would need a nullable override column on
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* `wagons` falling back to the type; deliberately not added, since no such
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* per-wagon value exists today.
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*/
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export class DropWagonSpecColumns2080000000000 implements MigrationInterface {
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public async up(queryRunner: QueryRunner): Promise<void> {
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await queryRunner.query(`
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ALTER TABLE freight.wagons
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DROP COLUMN IF EXISTS tare_weight,
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DROP COLUMN IF EXISTS max_payload_weight;
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`);
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}
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public async down(queryRunner: QueryRunner): Promise<void> {
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// Re-add nullable, backfill from the owning type, then restore NOT NULL.
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// The pre-drop values were drifted seed data and are not recoverable — the
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// type's spec is what they should always have held.
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await queryRunner.query(`
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ALTER TABLE freight.wagons
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ADD COLUMN IF NOT EXISTS tare_weight NUMERIC(10, 2),
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ADD COLUMN IF NOT EXISTS max_payload_weight NUMERIC(10, 2);
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`);
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await queryRunner.query(`
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UPDATE freight.wagons w
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SET tare_weight = t.tare_weight_tons,
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max_payload_weight = t.capacity_tons
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FROM freight.wagon_types t
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WHERE t.id = w.wagon_type_id;
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`);
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await queryRunner.query(`
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ALTER TABLE freight.wagons
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ALTER COLUMN tare_weight SET NOT NULL,
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ALTER COLUMN max_payload_weight SET NOT NULL;
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`);
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}
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}
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