Restore accidentally removed files, a few additional import/calculation fixes

inventory-server/db/migrations/add-date-online-and-shop-score.sql

@@ -0,0 +1,20 @@
+-- Migration: Add date_online and shop_score columns to products table
+-- These fields are imported from production to improve newsletter recommendation accuracy:
+--   date_online  = products.date_ol in production (date product went live on the shop)
+--   shop_score   = products.score in production (sales-based popularity score)
+--
+-- After running this migration, do a full (non-incremental) import to backfill:
+--   INCREMENTAL_UPDATE=false node scripts/import-from-prod.js
+
+-- Add date_online column (production: products.date_ol)
+ALTER TABLE products ADD COLUMN IF NOT EXISTS date_online TIMESTAMP WITH TIME ZONE;
+
+-- Add shop_score column (production: products.score)
+-- Using NUMERIC(10,2) to preserve the decimal precision from production
+ALTER TABLE products ADD COLUMN IF NOT EXISTS shop_score NUMERIC(10, 2) DEFAULT 0;
+
+-- If shop_score was previously created as INTEGER, convert it
+ALTER TABLE products ALTER COLUMN shop_score TYPE NUMERIC(10, 2);
+
+-- Index on date_online for the newsletter "new products" filter
+CREATE INDEX IF NOT EXISTS idx_products_date_online ON products(date_online);