Getting docker build ready again

output.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <OTA_ResRetrieveRS xmlns="http://www.opentravel.org/OTA/2003/05" Version="7.000">
   <ReservationsList>
-    <HotelReservation CreateDateTime="2025-09-29T07:33:12.122570+00:00" ResStatus="Requested" RoomStayReservation="true">
+    <HotelReservation CreateDateTime="2025-09-29T07:45:29.620017+00:00" ResStatus="Requested" RoomStayReservation="true">
       <UniqueID Type="14" ID="e084006b-ae83-4e4d-b2f5-074118cdb3b1"/>
       <RoomStays>
         <RoomStay>

src/alpine_bits_python/db.py

@@ -8,6 +8,7 @@ class Customer(Base):
     __tablename__ = 'customers'
     id = Column(Integer, primary_key=True)
     given_name = Column(String)
+    contact_id = Column(String, unique=True)
     surname = Column(String)
     name_prefix = Column(String)
     email_address = Column(String)

src/alpine_bits_python/main.py

@@ -126,10 +126,13 @@ def main():
     utm_comment = " | ".join(utm_comment_text) if utm_comment_text else None
     offer = data.get("field:angebot_auswaehlen")
 
+    contact_id = data.get("contact", {}).get("contactId")
+
     # Save customer and reservation to DB
     db_customer = DBCustomer(
         given_name=first_name,
         surname=last_name,
+        contact_id=contact_id,
         name_prefix=name_prefix,
         email_address=email,
         phone=phone_number,
@@ -189,6 +192,8 @@ def main():
         
     )
 
+    
+
     # CustomerData
     phone_numbers = [(phone_number, PhoneTechType.MOBILE)] if phone_number else []
     customer_data = CustomerData(