Split cart into 4 microservices: relations, likes, orders, page-config→blog

Phase 1 - Relations service (internal): owns ContainerRelation, exposes
get-children data + attach/detach-child actions. Retargeted events, blog,
market callers from cart to relations.

Phase 2 - Likes service (internal): unified Like model replaces ProductLike
and PostLike with generic target_type/target_slug/target_id. Exposes
is-liked, liked-slugs, liked-ids data + toggle action.

Phase 3 - PageConfig → blog: moved ownership to blog with direct DB queries,
removed proxy endpoints from cart.

Phase 4 - Orders service (public): owns Order/OrderItem + SumUp checkout
flow. Cart checkout now delegates to orders via create-order action.
Webhook/return routes and reconciliation moved to orders.

Phase 5 - Infrastructure: docker-compose, deploy.sh, Dockerfiles updated
for all 3 new services. Added orders_url helper and factory model imports.

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

shared/infrastructure/factory.py

@@ -12,7 +12,7 @@ from shared.config import init_config, config, pretty
 from shared.models import KV  # ensure shared models imported
 # Register all app model classes with SQLAlchemy so cross-domain
 # relationship() string references resolve correctly.
-for _mod in ("blog.models", "market.models", "cart.models", "events.models", "federation.models", "account.models"):
+for _mod in ("blog.models", "market.models", "cart.models", "events.models", "federation.models", "account.models", "relations.models", "likes.models", "orders.models"):
     try:
         __import__(_mod)
     except ImportError:

shared/infrastructure/urls.py

@@ -41,6 +41,10 @@ def federation_url(path: str = "/") -> str:
     return app_url("federation", path)
 
 
+def orders_url(path: str = "/") -> str:
+    return app_url("orders", path)
+
+
 def account_url(path: str = "/") -> str:
     return app_url("account", path)
 

shared/models/__init__.py

@@ -10,11 +10,11 @@ from .ghost_membership_entities import (
     GhostNewsletter, UserNewsletter,
     GhostTier, GhostSubscription,
 )
-from .ghost_content import Tag, Post, Author, PostAuthor, PostTag, PostLike
+from .ghost_content import Tag, Post, Author, PostAuthor, PostTag
 from .page_config import PageConfig
 from .order import Order, OrderItem
 from .market import (
-    Product, ProductLike, ProductImage, ProductSection,
+    Product, ProductImage, ProductSection,
     NavTop, NavSub, Listing, ListingItem,
     LinkError, LinkExternal, SubcategoryRedirect, ProductLog,
     ProductLabel, ProductSticker, ProductAttribute, ProductNutrition, ProductAllergen,

shared/models/ghost_content.py

@@ -131,12 +131,6 @@ class Post(Base):
         back_populates="posts",
         order_by="PostTag.sort_order",
     )
-    likes: Mapped[List["PostLike"]] = relationship(
-        "PostLike",
-        back_populates="post",
-        cascade="all, delete-orphan",
-        passive_deletes=True,
-    )
 
 class Author(Base):
     __tablename__ = "authors"
@@ -198,15 +192,3 @@ class PostTag(Base):
     sort_order: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
 
 
-class PostLike(Base):
-    __tablename__ = "post_likes"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    user_id = Column(Integer, nullable=False)
-    post_id: Mapped[int] = mapped_column(ForeignKey("posts.id", ondelete="CASCADE"), nullable=False)
-
-    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
-    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
-    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-
-    post: Mapped["Post"] = relationship("Post", back_populates="likes", foreign_keys=[post_id])

shared/models/market.py

@@ -107,28 +107,9 @@ class Product(Base):
         cascade="all, delete-orphan",
     )
 
-    likes = relationship(
-        "ProductLike",
-        back_populates="product",
-        cascade="all, delete-orphan",
-    )
     # cart_items and order_items live in a separate domain (cart DB)
     # — cross-domain relationships removed
 
-from sqlalchemy import Column
-
-class ProductLike(Base):
-    __tablename__ = "product_likes"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    user_id = Column(Integer, nullable=False)
-    product_slug: Mapped[str] = mapped_column(ForeignKey("products.slug", ondelete="CASCADE"))
-
-    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
-    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
-    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
-    product: Mapped["Product"] = relationship("Product", back_populates="likes", foreign_keys=[product_slug])
-
 
 class ProductImage(Base):
     __tablename__ = "product_images"

shared/services/market_impl.py

@@ -93,7 +93,7 @@ class SqlMarketService:
                 existing.deleted_at = None  # revive
                 existing.name = name
                 await session.flush()
-                await call_action("cart", "attach-child", payload={
+                await call_action("relations", "attach-child", payload={
                     "parent_type": container_type, "parent_id": container_id,
                     "child_type": "market", "child_id": existing.id,
                 })
@@ -106,7 +106,7 @@ class SqlMarketService:
         )
         session.add(market)
         await session.flush()
-        await call_action("cart", "attach-child", payload={
+        await call_action("relations", "attach-child", payload={
             "parent_type": container_type, "parent_id": container_id,
             "child_type": "market", "child_id": market.id,
         })
@@ -130,7 +130,7 @@ class SqlMarketService:
 
         market.deleted_at = utcnow()
         await session.flush()
-        await call_action("cart", "detach-child", payload={
+        await call_action("relations", "detach-child", payload={
             "parent_type": container_type, "parent_id": container_id,
             "child_type": "market", "child_id": market.id,
         })