Remove dead login_helper.py (replaced by glue/services/cart_adoption.py)

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

bp/cart/login_helper.py

@@ -1,57 +0,0 @@
-# app/cart_merge.py
-
-from __future__ import annotations
-
-from quart import g, session as qsession
-from sqlalchemy import select
-from typing import Optional
-
-from market.models.market import CartItem
-
-
-async def merge_anonymous_cart_into_user(user_id: int) -> None:
-    """
-    When a user logs in, move any anonymous cart (session_id) items onto their user_id.
-    """
-    sid: Optional[str] = qsession.get("cart_sid")
-    if not sid:
-        return
-
-    # get all anon cart items for this session
-    anon_items = (
-        await g.s.execute(
-            select(CartItem).where(
-                CartItem.deleted_at.is_(None),
-                CartItem.session_id == sid,
-            )
-        )
-    ).scalars().all()
-    if not anon_items:
-        return
-
-    # Existing user items keyed by product_id for quick merge
-    user_items_by_product = {
-        ci.product_id: ci
-        for ci in (
-            await g.s.execute(
-                select(CartItem).where(
-                    CartItem.deleted_at.is_(None),
-                    CartItem.user_id == user_id,
-                )
-            )
-        ).scalars().all()
-    }
-
-    for anon in anon_items:
-        existing = user_items_by_product.get(anon.product_id)
-        if existing:
-            # merge quantities then soft-delete the anon row
-            existing.quantity += anon.quantity
-            anon.deleted_at = func.now()
-        else:
-            # reassign anonymous cart row to this user
-            anon.user_id = user_id
-            anon.session_id = None
-
-    # clear the anonymous session id now that it's "claimed"
-    qsession.pop("cart_sid", None)