Not quite done but mostly starting to remove hashed_customer references

src/alpine_bits_python/db.py

@@ -362,36 +362,6 @@ class Customer(Base):
         self.hashed_birth_date = self._normalize_and_hash(self.birth_date)
 
 
-class HashedCustomer(Base):
-    """Hashed customer data for Meta Conversion API.
-
-    Stores SHA256 hashed versions of customer PII according to Meta's requirements.
-    This allows sending conversion events without exposing raw customer data.
-    """
-
-    __tablename__ = "hashed_customers"
-    id = Column(Integer, primary_key=True)
-    customer_id = Column(
-        Integer,
-        ForeignKey("customers.id", ondelete="SET NULL"),
-        unique=True,
-        nullable=True,
-    )
-    contact_id = Column(String, unique=True)  # Keep unhashed for reference
-    hashed_email = Column(String(64))  # SHA256 produces 64 hex chars
-    hashed_phone = Column(String(64))
-    hashed_given_name = Column(String(64))
-    hashed_surname = Column(String(64))
-    hashed_city = Column(String(64))
-    hashed_postal_code = Column(String(64))
-    hashed_country_code = Column(String(64))
-    hashed_gender = Column(String(64))
-    hashed_birth_date = Column(String(64))
-    created_at = Column(DateTime(timezone=True))
-
-    customer = relationship(
-        "Customer", backref=backref("hashed_version", uselist=False, lazy="joined")
-    )
 
 
 class ConversionGuest(Base):
@@ -430,10 +400,7 @@ 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(
@@ -452,7 +419,6 @@ class ConversionGuest(Base):
         primaryjoin="and_(ConversionGuest.hotel_id == foreign(Conversion.hotel_id), "
                     "ConversionGuest.guest_id == foreign(Conversion.guest_id))",
     )
-    hashed_customer = relationship("HashedCustomer", backref="conversion_guests")
 
     @staticmethod
     def _normalize_and_hash(value):
@@ -613,9 +579,6 @@ class Conversion(Base):
         Integer, ForeignKey("reservations.id"), nullable=True, index=True
     )
     customer_id = Column(Integer, ForeignKey("customers.id"), nullable=True, index=True)
-    hashed_customer_id = Column(
-        Integer, ForeignKey("hashed_customers.id"), nullable=True, index=True
-    )
 
     # Reservation metadata from XML
     hotel_id = Column(
@@ -670,7 +633,6 @@ class Conversion(Base):
     # Relationships
     reservation = relationship("Reservation", backref="conversions")
     customer = relationship("Customer", backref="conversions")
-    hashed_customer = relationship("HashedCustomer", backref="conversions")
     guest = relationship(
         "ConversionGuest",
         back_populates="conversions",