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>

blog/bp/blog/services/posts_data.py

@@ -1,8 +1,7 @@
 import re
 
 from ..ghost_db import DBClient  # adjust import path
-from sqlalchemy import select
-from models.ghost_content import PostLike
+from shared.infrastructure.data_client import fetch_data
 from shared.infrastructure.fragments import fetch_fragment
 from quart import g
 
@@ -68,22 +67,15 @@ async def posts_data(
   post_ids = [p["id"] for p in posts]
 
   # Add is_liked field to each post for current user
-  if g.user:
-      # Fetch all likes for this user and these posts in one query
-      liked_posts = await session.execute(
-          select(PostLike.post_id).where(
-              PostLike.user_id == g.user.id,
-              PostLike.post_id.in_(post_ids),
-              PostLike.deleted_at.is_(None),
-          )
-      )
-      liked_post_ids = {row[0] for row in liked_posts}
+  if g.user and post_ids:
+      liked_ids_list = await fetch_data("likes", "liked-ids", params={
+          "user_id": g.user.id, "target_type": "post",
+      }, required=False) or []
+      liked_post_ids = set(liked_ids_list)
 
-      # Add is_liked to each post
       for post in posts:
           post["is_liked"] = post["id"] in liked_post_ids
   else:
-      # Not logged in - no posts are liked
       for post in posts:
           post["is_liked"] = False