Switched to timezone aware schema for database

src/alpine_bits_python/db.py

@@ -97,7 +97,7 @@ class HashedCustomer(Base):
     hashed_country_code = Column(String(64))
     hashed_gender = Column(String(64))
     hashed_birth_date = Column(String(64))
-    created_at = Column(DateTime)
+    created_at = Column(DateTime(timezone=True))
 
     customer = relationship("Customer", backref="hashed_version")
 
@@ -114,7 +114,7 @@ class Reservation(Base):
     num_children = Column(Integer)
     children_ages = Column(String)  # comma-separated
     offer = Column(String)
-    created_at = Column(DateTime)
+    created_at = Column(DateTime(timezone=True))
     # Add all UTM fields and user comment for XML
     utm_source = Column(String)
     utm_medium = Column(String)
@@ -142,4 +142,4 @@ class AckedRequest(Base):
     unique_id = Column(
         String, index=True
     )  # Should match Reservation.form_id or another unique field
-    timestamp = Column(DateTime)
+    timestamp = Column(DateTime(timezone=True))