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>

market/bp/browse/services/services.py

@@ -13,8 +13,7 @@ from .blacklist.product_details import is_blacklisted_heading
 from shared.utils import host_url
 
 
-from sqlalchemy import select
-from models import ProductLike
+from shared.infrastructure.data_client import fetch_data
 from ...market.filters.qs import decode
 
 
@@ -171,15 +170,9 @@ async def _is_liked(user_id: int | None, slug: str) -> bool:
     """
     if not user_id:
         return False
-    # because ProductLike has composite PK (user_id, product_slug),
-    # we can fetch it by primary key dict:
-    row = await g.s.execute(
-        select(ProductLike).where(
-            ProductLike.user_id == user_id,
-            ProductLike.product_slug == slug,
-        )
-    )
-    row.scalar_one_or_none()
-    return row is not None
+    liked_data = await fetch_data("likes", "is-liked", params={
+        "user_id": user_id, "target_type": "product", "target_slug": slug,
+    }, required=False)
+    return (liked_data or {}).get("liked", False)