priceInfoRange is a Relay-style cursor connection over the subscription's
entire price history. With no cursor, first:96 returned the OLDEST 96 slots,
anchored at the subscription start date — a fixed window that never advanced.
For a contract added mid-period this meant refresh_prices kept re-upserting the
same day-one slots forever, so GET /api/energy/prices found nothing in the
today+tomorrow window and the UI showed "No Tibber price points available".
Use last:192 to return the newest 192 quarter-hourly slots (2 days), which ends
at the latest published slot and advances daily, fully covering the prices
endpoint's today+tomorrow window.
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