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>

events/bp/data/routes.py

@@ -1,148 +1,14 @@
 """Events app data endpoints.
 
-Exposes read-only JSON queries at ``/internal/data/<query_name>`` for
-cross-app callers via the internal data client.
+All queries are defined in ``events/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.contracts.dtos import dto_to_dict
-from shared.services.registry import services
+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)
-
-    # --- pending-entries ---
-    async def _pending_entries():
-        user_id = request.args.get("user_id", type=int)
-        session_id = request.args.get("session_id")
-        entries = await services.calendar.pending_entries(
-            g.s, user_id=user_id, session_id=session_id,
-        )
-        return [dto_to_dict(e) for e in entries]
-
-    _handlers["pending-entries"] = _pending_entries
-
-    # --- pending-tickets ---
-    async def _pending_tickets():
-        user_id = request.args.get("user_id", type=int)
-        session_id = request.args.get("session_id")
-        tickets = await services.calendar.pending_tickets(
-            g.s, user_id=user_id, session_id=session_id,
-        )
-        return [dto_to_dict(t) for t in tickets]
-
-    _handlers["pending-tickets"] = _pending_tickets
-
-    # --- entries-for-page ---
-    async def _entries_for_page():
-        page_id = request.args.get("page_id", type=int)
-        user_id = request.args.get("user_id", type=int)
-        session_id = request.args.get("session_id")
-        entries = await services.calendar.entries_for_page(
-            g.s, page_id, user_id=user_id, session_id=session_id,
-        )
-        return [dto_to_dict(e) for e in entries]
-
-    _handlers["entries-for-page"] = _entries_for_page
-
-    # --- tickets-for-page ---
-    async def _tickets_for_page():
-        page_id = request.args.get("page_id", type=int)
-        user_id = request.args.get("user_id", type=int)
-        session_id = request.args.get("session_id")
-        tickets = await services.calendar.tickets_for_page(
-            g.s, page_id, user_id=user_id, session_id=session_id,
-        )
-        return [dto_to_dict(t) for t in tickets]
-
-    _handlers["tickets-for-page"] = _tickets_for_page
-
-    # --- entries-for-order ---
-    async def _entries_for_order():
-        order_id = request.args.get("order_id", type=int)
-        entries = await services.calendar.get_entries_for_order(g.s, order_id)
-        return [dto_to_dict(e) for e in entries]
-
-    _handlers["entries-for-order"] = _entries_for_order
-
-    # --- tickets-for-order ---
-    async def _tickets_for_order():
-        order_id = request.args.get("order_id", type=int)
-        tickets = await services.calendar.get_tickets_for_order(g.s, order_id)
-        return [dto_to_dict(t) for t in tickets]
-
-    _handlers["tickets-for-order"] = _tickets_for_order
-
-    # --- entry-ids-for-content ---
-    async def _entry_ids_for_content():
-        content_type = request.args.get("content_type", "")
-        content_id = request.args.get("content_id", type=int)
-        ids = await services.calendar.entry_ids_for_content(g.s, content_type, content_id)
-        return list(ids)
-
-    _handlers["entry-ids-for-content"] = _entry_ids_for_content
-
-    # --- associated-entries ---
-    async def _associated_entries():
-        content_type = request.args.get("content_type", "")
-        content_id = request.args.get("content_id", type=int)
-        page = request.args.get("page", 1, type=int)
-        entries, has_more = await services.calendar.associated_entries(
-            g.s, content_type, content_id, page,
-        )
-        return {"entries": [dto_to_dict(e) for e in entries], "has_more": has_more}
-
-    _handlers["associated-entries"] = _associated_entries
-
-    # --- calendars-for-container ---
-    async def _calendars_for_container():
-        container_type = request.args.get("type", "")
-        container_id = request.args.get("id", type=int)
-        calendars = await services.calendar.calendars_for_container(
-            g.s, container_type, container_id,
-        )
-        return [dto_to_dict(c) for c in calendars]
-
-    _handlers["calendars-for-container"] = _calendars_for_container
-
-    # --- visible-entries-for-period ---
-    async def _visible_entries_for_period():
-        from datetime import datetime
-        calendar_id = request.args.get("calendar_id", type=int)
-        period_start = datetime.fromisoformat(request.args.get("period_start", ""))
-        period_end = datetime.fromisoformat(request.args.get("period_end", ""))
-        user_id = request.args.get("user_id", type=int)
-        session_id = request.args.get("session_id")
-        # is_admin determined server-side, never from client params
-        is_admin = False
-        entries = await services.calendar.visible_entries_for_period(
-            g.s, calendar_id, period_start, period_end,
-            user_id=user_id, is_admin=is_admin, session_id=session_id,
-        )
-        return [dto_to_dict(e) for e in entries]
-
-    _handlers["visible-entries-for-period"] = _visible_entries_for_period
-
+    bp, _handlers = create_data_blueprint("events")
     return bp