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/post/admin/routes.py

@@ -22,23 +22,27 @@ def register():
   @require_admin
   async def admin(slug: str):
     from shared.browser.app.utils.htmx import is_htmx_request
-    from shared.infrastructure.data_client import fetch_data
+    from sqlalchemy import select
+    from shared.models.page_config import PageConfig
 
-    # Load features for page admin (page_configs lives in db_cart)
+    # Load features for page admin (page_configs now lives in db_blog)
     post = (g.post_data or {}).get("post", {})
     features = {}
     sumup_configured = False
     sumup_merchant_code = ""
     sumup_checkout_prefix = ""
     if post.get("is_page"):
-        raw_pc = await fetch_data("cart", "page-config",
-            params={"container_type": "page", "container_id": post["id"]},
-            required=False)
-        if raw_pc:
-            features = raw_pc.get("features") or {}
-            sumup_configured = bool(raw_pc.get("sumup_api_key"))
-            sumup_merchant_code = raw_pc.get("sumup_merchant_code") or ""
-            sumup_checkout_prefix = raw_pc.get("sumup_checkout_prefix") or ""
+        pc = (await g.s.execute(
+            select(PageConfig).where(
+                PageConfig.container_type == "page",
+                PageConfig.container_id == post["id"],
+            )
+        )).scalar_one_or_none()
+        if pc:
+            features = pc.features or {}
+            sumup_configured = bool(pc.sumup_api_key)
+            sumup_merchant_code = pc.sumup_merchant_code or ""
+            sumup_checkout_prefix = pc.sumup_checkout_prefix or ""
 
     ctx = {
         "features": features,
@@ -84,7 +88,7 @@ def register():
         return jsonify({"error": "Expected JSON object with feature flags."}), 400
 
     # Update via cart action (page_configs lives in db_cart)
-    result = await call_action("cart", "update-page-config", payload={
+    result = await call_action("blog", "update-page-config", payload={
         "container_type": "page",
         "container_id": post_id,
         "features": body,
@@ -129,7 +133,7 @@ def register():
     if api_key:
         payload["sumup_api_key"] = api_key
 
-    result = await call_action("cart", "update-page-config", payload=payload)
+    result = await call_action("blog", "update-page-config", payload=payload)
 
     features = result.get("features", {})
     html = await render_template(

blog/bp/post/routes.py

@@ -11,8 +11,8 @@ from quart import (
     request,
 )
 from .services.post_data import post_data
-from .services.post_operations import toggle_post_like
 from shared.infrastructure.data_client import fetch_data
+from shared.infrastructure.actions import call_action
 from shared.contracts.dtos import CartSummaryDTO, dto_from_dict
 from shared.infrastructure.fragments import fetch_fragment, fetch_fragments
 
@@ -144,11 +144,10 @@ def register():
       post_id = g.post_data["post"]["id"]
       user_id = g.user.id
 
-      liked, error = await toggle_post_like(g.s, user_id, post_id)
-
-      if error:
-          resp = make_response(error, 404)
-          return resp
+      result = await call_action("likes", "toggle", payload={
+          "user_id": user_id, "target_type": "post", "target_id": post_id,
+      })
+      liked = result["liked"]
 
       html = await render_template(
           "_types/browse/like/button.html",

blog/bp/post/services/markets.py

@@ -41,7 +41,7 @@ async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPl
     if not post.is_page:
         raise MarketError("Markets can only be created on pages, not posts.")
 
-    raw_pc = await fetch_data("cart", "page-config",
+    raw_pc = await fetch_data("blog", "page-config",
         params={"container_type": "page", "container_id": post_id},
         required=False)
     if raw_pc is None or not (raw_pc.get("features") or {}).get("market"):

blog/bp/post/services/post_data.py

@@ -1,6 +1,5 @@
 from ...blog.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 quart import g
 
 async def post_data(slug, session, include_drafts=False):
@@ -15,14 +14,10 @@ async def post_data(slug, session, include_drafts=False):
   # Check if current user has liked this post
   is_liked = False
   if g.user:
-      liked_record = await session.scalar(
-          select(PostLike).where(
-              PostLike.user_id == g.user.id,
-              PostLike.post_id == post["id"],
-              PostLike.deleted_at.is_(None),
-          )
-      )
-      is_liked = liked_record is not None
+      liked_data = await fetch_data("likes", "is-liked", params={
+          "user_id": g.user.id, "target_type": "post", "target_id": post["id"],
+      }, required=False)
+      is_liked = (liked_data or {}).get("liked", False)
 
   # Add is_liked to post dict
   post["is_liked"] = is_liked

blog/bp/post/services/post_operations.py

@@ -1,58 +0,0 @@
-from __future__ import annotations
-
-from typing import Optional
-
-from sqlalchemy import select, func, update
-from sqlalchemy.ext.asyncio import AsyncSession
-
-from models.ghost_content import Post, PostLike
-
-
-async def toggle_post_like(
-    session: AsyncSession,
-    user_id: int,
-    post_id: int,
-) -> tuple[bool, Optional[str]]:
-    """
-    Toggle a post like for a given user using soft deletes.
-    Returns (liked_state, error_message).
-    - If error_message is not None, an error occurred.
-    - liked_state indicates whether post is now liked (True) or unliked (False).
-    """
-
-    # Verify post exists
-    post_exists = await session.scalar(
-        select(Post.id).where(Post.id == post_id, Post.deleted_at.is_(None))
-    )
-    if not post_exists:
-        return False, "Post not found"
-
-    # Check if like exists (not deleted)
-    existing = await session.scalar(
-        select(PostLike).where(
-            PostLike.user_id == user_id,
-            PostLike.post_id == post_id,
-            PostLike.deleted_at.is_(None),
-        )
-    )
-
-    if existing:
-        # Unlike: soft delete the like
-        await session.execute(
-            update(PostLike)
-            .where(
-                PostLike.user_id == user_id,
-                PostLike.post_id == post_id,
-                PostLike.deleted_at.is_(None),
-            )
-            .values(deleted_at=func.now())
-        )
-        return False, None
-    else:
-        # Like: add a new like
-        new_like = PostLike(
-            user_id=user_id,
-            post_id=post_id,
-        )
-        session.add(new_like)
-        return True, None