feat: per-page SumUp models and migration (Phase 3)

- Migration: add market_place_id to cart_items, page_config_id to orders
- Order model: add page_config_id FK and page_config relationship
- CartItem model: add market_place_id FK and market_place relationship

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

alembic/versions/c3d4e5f6a7b8_add_page_tracking_to_orders.py

@@ -0,0 +1,55 @@
+"""add page_config_id to orders, market_place_id to cart_items
+
+Revision ID: c3d4e5f6a7b8
+Revises: b2c3d4e5f6a7
+Create Date: 2026-02-10
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = 'c3d4e5f6a7b8'
+down_revision = 'b2c3d4e5f6a7'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # 1. Add market_place_id to cart_items
+    op.add_column(
+        'cart_items',
+        sa.Column('market_place_id', sa.Integer(), nullable=True),
+    )
+    op.create_foreign_key(
+        'fk_cart_items_market_place_id',
+        'cart_items',
+        'market_places',
+        ['market_place_id'],
+        ['id'],
+        ondelete='SET NULL',
+    )
+    op.create_index('ix_cart_items_market_place_id', 'cart_items', ['market_place_id'])
+
+    # 2. Add page_config_id to orders
+    op.add_column(
+        'orders',
+        sa.Column('page_config_id', sa.Integer(), nullable=True),
+    )
+    op.create_foreign_key(
+        'fk_orders_page_config_id',
+        'orders',
+        'page_configs',
+        ['page_config_id'],
+        ['id'],
+        ondelete='SET NULL',
+    )
+    op.create_index('ix_orders_page_config_id', 'orders', ['page_config_id'])
+
+
+def downgrade() -> None:
+    op.drop_index('ix_orders_page_config_id', table_name='orders')
+    op.drop_constraint('fk_orders_page_config_id', 'orders', type_='foreignkey')
+    op.drop_column('orders', 'page_config_id')
+
+    op.drop_index('ix_cart_items_market_place_id', table_name='cart_items')
+    op.drop_constraint('fk_cart_items_market_place_id', 'cart_items', type_='foreignkey')
+    op.drop_column('cart_items', 'market_place_id')

models/market.py

@@ -413,6 +413,12 @@ class CartItem(Base):
         nullable=False,
         server_default=func.now(),
     )
+    market_place_id: Mapped[int | None] = mapped_column(
+        ForeignKey("market_places.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
+
     deleted_at: Mapped[datetime | None] = mapped_column(
         DateTime(timezone=True),
         nullable=True,
@@ -420,6 +426,10 @@ class CartItem(Base):
 
     # Relationships
 
+    market_place: Mapped["MarketPlace | None"] = relationship(
+        "MarketPlace",
+        foreign_keys=[market_place_id],
+    )
     product: Mapped["Product"] = relationship(
         "Product",
         back_populates="cart_items",

models/order.py

@@ -17,6 +17,12 @@ class Order(Base):
     user_id: Mapped[Optional[int]] = mapped_column(ForeignKey("users.id"), nullable=True)
     session_id: Mapped[Optional[str]] = mapped_column(String(64), index=True, nullable=True)
 
+    page_config_id: Mapped[Optional[int]] = mapped_column(
+        ForeignKey("page_configs.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
+
     status: Mapped[str] = mapped_column(
         String(32),
         nullable=False,
@@ -68,6 +74,11 @@ class Order(Base):
         back_populates="order",
         lazy="selectin",
     )
+    page_config: Mapped[Optional["PageConfig"]] = relationship(
+        "PageConfig",
+        foreign_keys=[page_config_id],
+        lazy="selectin",
+    )
 
 
 class OrderItem(Base):