Previous logic fired an alert whenever prices_6h=0, even when prices
were genuinely stable (content hash dedup prevents duplicate inserts).
This caused Flexoptix, ATGBICS and others to trigger alerts every 3h
despite their scrapers running successfully.
New logic:
🔴 CRITICAL: last price > 7 days (genuine failure)
🟡 WARNING: last price 48h–7 days (possibly stale)
✅ STABLE: last price ≤48h, 0 new (prices unchanged, scraper OK)
Also shows pg-boss job state/time alongside each vendor for faster
root-cause diagnosis. Trimmed EXPECTED_VENDORS to vendors with actual
scraper implementations (removed never-scraped placeholders).
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