A stray montzar tick landed in the prices table, which stores no source, so
the database_last fallback served a ~168M quote on a shop whose Zaarbox board
was at ~217M. Last price and today's high/low now come from price_sync_logs
filtered by price_provider, the database fallback no longer counts as today's
price, and daily extremes reset when the provider changes.
Co-authored-by: Cursor <cursoragent@cursor.com>