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>

orders/alembic/env.py

@@ -0,0 +1,12 @@
+from alembic import context
+from shared.db.alembic_env import run_alembic
+
+MODELS = [
+    "shared.models.order",
+]
+
+TABLES = frozenset({
+    "orders", "order_items",
+})
+
+run_alembic(context.config, MODELS, TABLES)

orders/alembic/versions/0001_initial.py

@@ -0,0 +1,67 @@
+"""Initial orders tables
+
+Revision ID: orders_0001
+Revises: None
+Create Date: 2026-02-27
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "orders_0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def _table_exists(conn, name):
+    result = conn.execute(sa.text(
+        "SELECT 1 FROM information_schema.tables WHERE table_schema='public' AND table_name=:t"
+    ), {"t": name})
+    return result.scalar() is not None
+
+
+def upgrade():
+    if not _table_exists(op.get_bind(), "orders"):
+        op.create_table(
+            "orders",
+            sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+            sa.Column("user_id", sa.Integer, nullable=True),
+            sa.Column("session_id", sa.String(64), nullable=True),
+            sa.Column("page_config_id", sa.Integer, nullable=True),
+            sa.Column("status", sa.String(32), nullable=False, server_default="pending"),
+            sa.Column("currency", sa.String(16), nullable=False, server_default="GBP"),
+            sa.Column("total_amount", sa.Numeric(12, 2), nullable=False),
+            sa.Column("description", sa.Text, nullable=True),
+            sa.Column("sumup_reference", sa.String(255), nullable=True),
+            sa.Column("sumup_checkout_id", sa.String(128), nullable=True),
+            sa.Column("sumup_status", sa.String(32), nullable=True),
+            sa.Column("sumup_hosted_url", sa.Text, nullable=True),
+            sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+            sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        )
+        op.create_index("ix_orders_session_id", "orders", ["session_id"])
+        op.create_index("ix_orders_page_config_id", "orders", ["page_config_id"])
+        op.create_index("ix_orders_description", "orders", ["description"], postgresql_using="hash")
+        op.create_index("ix_orders_sumup_reference", "orders", ["sumup_reference"])
+        op.create_index("ix_orders_sumup_checkout_id", "orders", ["sumup_checkout_id"])
+
+    if not _table_exists(op.get_bind(), "order_items"):
+        op.create_table(
+            "order_items",
+            sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+            sa.Column("order_id", sa.Integer, sa.ForeignKey("orders.id", ondelete="CASCADE"), nullable=False),
+            sa.Column("product_id", sa.Integer, nullable=False),
+            sa.Column("product_title", sa.String(512), nullable=True),
+            sa.Column("product_slug", sa.String(512), nullable=True),
+            sa.Column("product_image", sa.Text, nullable=True),
+            sa.Column("quantity", sa.Integer, nullable=False, server_default="1"),
+            sa.Column("unit_price", sa.Numeric(12, 2), nullable=False),
+            sa.Column("currency", sa.String(16), nullable=False, server_default="GBP"),
+            sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        )
+
+
+def downgrade():
+    op.drop_table("order_items")
+    op.drop_table("orders")