now with a working countdowntimer for each dewar

backend/app/data/slots_data.py

@@ -29,8 +29,6 @@ slots = [
         qr_base=qrcode.split('-')[1] if '-' in qrcode else '',
         occupied=False,
         needs_refill=False,
-        last_refill=datetime.utcnow(),
-        time_until_refill=timedelta_to_str(timedelta(hours=24))  # Serialize timedelta to ISO 8601 string
     )
     for i, qrcode in enumerate(slotQRCodes)
 ]