51 lines
1.9 KiB
JavaScript
Executable File
51 lines
1.9 KiB
JavaScript
Executable File
"use strict";
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module.exports = {
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async up(queryInterface, Sequelize) {
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// 1) add backup column for original sell_cost (idempotent)
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await queryInterface.sequelize.query(`
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ALTER TABLE IF EXISTS falukant_type.product
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ADD COLUMN IF NOT EXISTS original_sell_cost numeric;
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`);
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// 2) if original_sell_cost is not set, copy current sell_cost into it
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await queryInterface.sequelize.query(`
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UPDATE falukant_type.product
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SET original_sell_cost = sell_cost
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WHERE original_sell_cost IS NULL;
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`);
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// 3) compute max cumulative tax across regions and increase sell_cost accordingly
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// We use the maximum cumulative tax (worst-case) so sellers are neutral across regions.
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// Formula: neutral_sell = CEIL(original_sell_cost * (1 / (1 - max_total/100)))
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await queryInterface.sequelize.query(`
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WITH RECURSIVE ancestors AS (
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SELECT id AS start_id, id, parent_id, tax_percent FROM falukant_data.region
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UNION ALL
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SELECT a.start_id, r.id, r.parent_id, r.tax_percent
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FROM falukant_data.region r
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JOIN ancestors a ON r.id = a.parent_id
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), totals AS (
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SELECT start_id, COALESCE(SUM(tax_percent), 0) AS total FROM ancestors GROUP BY start_id
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), mm AS (
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SELECT COALESCE(MAX(total),0) AS max_total FROM totals
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)
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UPDATE falukant_type.product
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SET sell_cost = CEIL(original_sell_cost * (CASE WHEN (1 - mm.max_total/100) <= 0 THEN 1 ELSE (1 / (1 - mm.max_total/100)) END))
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FROM mm
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WHERE original_sell_cost IS NOT NULL;
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`);
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},
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async down(queryInterface, Sequelize) {
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await queryInterface.sequelize.query(`
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ALTER TABLE IF EXISTS falukant_type.product
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DROP COLUMN IF EXISTS sell_cost_min_neutral;
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`);
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await queryInterface.sequelize.query(`
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ALTER TABLE IF EXISTS falukant_type.product
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DROP COLUMN IF EXISTS sell_cost_max_neutral;
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`);
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}
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};
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