Replace inter-service _handlers dicts with declarative sx defquery/defaction

The inter-service data layer (fetch_data/call_action) was the least
structured part of the codebase — Python _handlers dicts with ad-hoc
param extraction scattered across 16 route files. This replaces them
with declarative .sx query/action definitions that make the entire
inter-service protocol self-describing and greppable.

Infrastructure:
- defquery/defaction special forms in the sx evaluator
- Query/action registry with load, lookup, and schema introspection
- Query executor using async_eval with I/O primitives
- Blueprint factories (create_data_blueprint/create_action_blueprint)
  with sx-first dispatch and Python fallback
- /internal/schema endpoint on every service
- parse-datetime and split-ids primitives for type coercion

Service extractions:
- LikesService (toggle, is_liked, liked_slugs, liked_ids)
- PageConfigService (ensure, get_by_container, get_by_id, get_batch, update)
- RelationsService (wraps module-level functions)
- AccountDataService (user_by_email, newsletters)
- CartItemsService, MarketDataService (raw SQLAlchemy lookups)

50 of 54 handlers converted to sx, 4 Python fallbacks remain
(ghost-sync/push-member, clear-cart-for-order, create-order).
Net: -1,383 lines Python, +251 lines modified.

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

likes/actions.sx

@@ -0,0 +1,8 @@
+;; Likes service — inter-service action endpoints
+
+(defaction toggle (&key user-id target-type target-slug target-id)
+  "Toggle a like on a content item. Returns whether now liked."
+  (let ((liked (service "likes" "toggle"
+                 :user-id user-id :target-type target-type
+                 :target-slug target-slug :target-id target-id)))
+    {"liked" liked}))

likes/bp/actions/routes.py

@@ -1,81 +1,14 @@
-"""Likes app action endpoints."""
+"""Likes app action endpoints.
+
+All actions are defined in ``likes/actions.sx``.
+"""
 from __future__ import annotations
 
-from quart import Blueprint, g, jsonify, request
+from quart import Blueprint
 
-from shared.infrastructure.actions import ACTION_HEADER
+from shared.infrastructure.query_blueprint import create_action_blueprint
 
 
 def register() -> Blueprint:
-    bp = Blueprint("actions", __name__, url_prefix="/internal/actions")
-
-    @bp.before_request
-    async def _require_action_header():
-        if not request.headers.get(ACTION_HEADER):
-            return jsonify({"error": "forbidden"}), 403
-        from shared.infrastructure.internal_auth import validate_internal_request
-        if not validate_internal_request():
-            return jsonify({"error": "forbidden"}), 403
-
-    _handlers: dict[str, object] = {}
-
-    @bp.post("/<action_name>")
-    async def handle_action(action_name: str):
-        handler = _handlers.get(action_name)
-        if handler is None:
-            return jsonify({"error": "unknown action"}), 404
-        try:
-            result = await handler()
-            return jsonify(result)
-        except Exception as exc:
-            import logging
-            logging.getLogger(__name__).exception("Action %s failed", action_name)
-            return jsonify({"error": str(exc)}), 500
-
-    # --- toggle ---
-    async def _toggle():
-        """Toggle a like. Returns {"liked": bool}."""
-        from sqlalchemy import select, update, func
-        from likes.models.like import Like
-
-        data = await request.get_json(force=True)
-        user_id = data["user_id"]
-        target_type = data["target_type"]
-        target_slug = data.get("target_slug")
-        target_id = data.get("target_id")
-
-        filters = [
-            Like.user_id == user_id,
-            Like.target_type == target_type,
-            Like.deleted_at.is_(None),
-        ]
-        if target_slug is not None:
-            filters.append(Like.target_slug == target_slug)
-        elif target_id is not None:
-            filters.append(Like.target_id == target_id)
-        else:
-            return {"error": "target_slug or target_id required"}, 400
-
-        existing = await g.s.scalar(select(Like).where(*filters))
-
-        if existing:
-            # Unlike: soft delete
-            await g.s.execute(
-                update(Like).where(Like.id == existing.id).values(deleted_at=func.now())
-            )
-            return {"liked": False}
-        else:
-            # Like: insert new
-            new_like = Like(
-                user_id=user_id,
-                target_type=target_type,
-                target_slug=target_slug,
-                target_id=target_id,
-            )
-            g.s.add(new_like)
-            await g.s.flush()
-            return {"liked": True}
-
-    _handlers["toggle"] = _toggle
-
+    bp, _handlers = create_action_blueprint("likes")
     return bp

likes/bp/data/routes.py

@@ -1,109 +1,14 @@
-"""Likes app data endpoints."""
+"""Likes app data endpoints.
+
+All queries are defined in ``likes/queries.sx``.
+"""
 from __future__ import annotations
 
-from quart import Blueprint, g, jsonify, request
+from quart import Blueprint
 
-from shared.infrastructure.data_client import DATA_HEADER
+from shared.infrastructure.query_blueprint import create_data_blueprint
 
 
 def register() -> Blueprint:
-    bp = Blueprint("data", __name__, url_prefix="/internal/data")
-
-    @bp.before_request
-    async def _require_data_header():
-        if not request.headers.get(DATA_HEADER):
-            return jsonify({"error": "forbidden"}), 403
-        from shared.infrastructure.internal_auth import validate_internal_request
-        if not validate_internal_request():
-            return jsonify({"error": "forbidden"}), 403
-
-    _handlers: dict[str, object] = {}
-
-    @bp.get("/<query_name>")
-    async def handle_query(query_name: str):
-        handler = _handlers.get(query_name)
-        if handler is None:
-            return jsonify({"error": "unknown query"}), 404
-        result = await handler()
-        return jsonify(result)
-
-    # --- is-liked ---
-    async def _is_liked():
-        """Check if a user has liked a specific target."""
-        from sqlalchemy import select
-        from models.like import Like
-
-        user_id = request.args.get("user_id", type=int)
-        target_type = request.args.get("target_type", "")
-        target_slug = request.args.get("target_slug")
-        target_id = request.args.get("target_id", type=int)
-
-        if not user_id or not target_type:
-            return {"liked": False}
-
-        filters = [
-            Like.user_id == user_id,
-            Like.target_type == target_type,
-            Like.deleted_at.is_(None),
-        ]
-        if target_slug is not None:
-            filters.append(Like.target_slug == target_slug)
-        elif target_id is not None:
-            filters.append(Like.target_id == target_id)
-        else:
-            return {"liked": False}
-
-        row = await g.s.scalar(select(Like.id).where(*filters))
-        return {"liked": row is not None}
-
-    _handlers["is-liked"] = _is_liked
-
-    # --- liked-slugs ---
-    async def _liked_slugs():
-        """Return all liked target_slugs for a user + target_type."""
-        from sqlalchemy import select
-        from models.like import Like
-
-        user_id = request.args.get("user_id", type=int)
-        target_type = request.args.get("target_type", "")
-
-        if not user_id or not target_type:
-            return []
-
-        result = await g.s.execute(
-            select(Like.target_slug).where(
-                Like.user_id == user_id,
-                Like.target_type == target_type,
-                Like.target_slug.isnot(None),
-                Like.deleted_at.is_(None),
-            )
-        )
-        return list(result.scalars().all())
-
-    _handlers["liked-slugs"] = _liked_slugs
-
-    # --- liked-ids ---
-    async def _liked_ids():
-        """Return all liked target_ids for a user + target_type."""
-        from sqlalchemy import select
-        from models.like import Like
-
-        user_id = request.args.get("user_id", type=int)
-        target_type = request.args.get("target_type", "")
-
-        if not user_id or not target_type:
-            return []
-
-        result = await g.s.execute(
-            select(Like.target_id).where(
-                Like.user_id == user_id,
-                Like.target_type == target_type,
-                Like.target_id.isnot(None),
-                Like.deleted_at.is_(None),
-            )
-        )
-        return list(result.scalars().all())
-
-    _handlers["liked-ids"] = _liked_ids
-
+    bp, _handlers = create_data_blueprint("likes")
     return bp

likes/queries.sx

@@ -0,0 +1,18 @@
+;; Likes service — inter-service data queries
+
+(defquery is-liked (&key user-id target-type target-slug target-id)
+  "Check if a user has liked a specific target."
+  (let ((result (service "likes" "is-liked"
+                  :user-id user-id :target-type target-type
+                  :target-slug target-slug :target-id target-id)))
+    {"liked" result}))
+
+(defquery liked-slugs (&key user-id target-type)
+  "Return all liked target_slugs for a user + target_type."
+  (service "likes" "liked-slugs"
+    :user-id user-id :target-type target-type))
+
+(defquery liked-ids (&key user-id target-type)
+  "Return all liked target_ids for a user + target_type."
+  (service "likes" "liked-ids"
+    :user-id user-id :target-type target-type))

likes/services/__init__.py

@@ -4,3 +4,6 @@ from __future__ import annotations
 
 def register_domain_services() -> None:
     """Register services for the likes app."""
+    from shared.services.registry import services
+    from shared.services.likes_impl import SqlLikesService
+    services.likes = SqlLikesService()