-- Migration 027: Fix FS.COM price observations currency
--
-- FS.COM scraper previously scraped www.fs.com (USD) and tried to convert USD→EUR.
-- Now scrapes de.fs.com (EUR) directly — prices are real EUR values.
-- This migration cleans up any existing FS.COM prices that were derived (USD→EUR)
-- and marks them for re-scraping on next run.
--
-- Applied: 2026-04-06 (after fs-com.ts BASE_URL switch to de.fs.com)

-- Delete price observations from FS.COM that look like converted USD prices
-- (prices stored as USD but attributed to de.fs.com source after the switch)
-- We just delete them all so the next scrape gets fresh EUR prices
DELETE FROM price_observations po
USING vendors v
WHERE po.source_vendor_id = v.id
  AND v.slug = 'fs-com'
  AND po.time < NOW() - INTERVAL '7 days';

-- Reset verification for affected transceivers so they get re-verified
UPDATE transceivers t
SET
  price_verified = FALSE,
  price_verified_eur = NULL,
  fully_verified = FALSE,
  updated_at = NOW()
FROM vendors v
WHERE t.vendor_id = v.id
  AND v.slug = 'fs-com'
  AND t.price_verified = TRUE
  AND t.price_verified_eur IS NOT NULL;

-- Report remaining FS.COM observations
SELECT
  v.name AS vendor,
  po.currency,
  COUNT(*) AS count,
  ROUND(AVG(po.price), 2) AS avg_price,
  MIN(po.time) AS oldest,
  MAX(po.time) AS newest
FROM price_observations po
JOIN vendors v ON po.source_vendor_id = v.id
WHERE v.slug = 'fs-com'
GROUP BY v.name, po.currency
ORDER BY count DESC;