fixing bugs with ci pipeline

backend/app/routers/dewar.py

@@ -1,4 +1,8 @@
-import os, tempfile, time, random, hashlib
+import os
+import tempfile
+import time
+import random
+import hashlib
 from fastapi import APIRouter, HTTPException, status, Depends, Response
 from sqlalchemy.orm import Session, joinedload
 from typing import List
@@ -21,14 +25,12 @@ from app.models import (
     Sample as SampleModel,
     DewarType as DewarTypeModel,
     DewarSerialNumber as DewarSerialNumberModel,
-    Shipment as ShipmentModel,  # Clearer name for model
 )
 from app.dependencies import get_db
-import uuid
 import qrcode
 import io
 from io import BytesIO
-from PIL import ImageFont, ImageDraw, Image
+from PIL import Image
 from reportlab.lib.pagesizes import A5, landscape
 from reportlab.lib.units import cm
 from reportlab.pdfgen import canvas
@@ -211,7 +213,7 @@ def generate_label(dewar):
         c.drawString(2 * cm, y_position, f"Country: {return_address.country}")
         y_position -= line_height
 
-    c.drawString(2 * cm, y_position, f"Beamtime Information: Placeholder")
+    c.drawString(2 * cm, y_position, "Beamtime Information: Placeholder")
 
     # Generate QR code
     qr = qrcode.QRCode(version=1, box_size=10, border=4)