On we go. Maybe soon this will be done

src/alpine_bits_python/db.py

@@ -395,6 +395,9 @@ class ConversionGuest(Base):
     hashed_country_code = Column(String(64))
     hashed_birth_date = Column(String(64))
 
+    # Matched customer reference (nullable, filled after matching)
+    hashed_customer_id = Column(Integer, ForeignKey("hashed_customers.id"), nullable=True, index=True)
+
     # Guest classification
     is_regular = Column(Boolean, default=False)  # True if guest has many prior stays before appearing in our reservations
 
@@ -404,6 +407,7 @@ class ConversionGuest(Base):
 
     # Relationships
     conversions = relationship("Conversion", back_populates="guest")
+    hashed_customer = relationship("HashedCustomer", backref="conversion_guests")
 
     @staticmethod
     def _normalize_and_hash(value):