diff --git a/api/auth.py b/api/auth.py
index 3784dfb..e295404 100644
--- a/api/auth.py
+++ b/api/auth.py
@@ -44,7 +44,7 @@ async def login(
 
 
 @router.post(
-    "/refresh",
+    "/refresh-cookie",
     response_model=persons.Person,
     operation_id="refresh",
     summary="Refresh current user from cookie",
diff --git a/api/shopping_v2.py b/api/shopping_v2.py
index 792d190..8b872a7 100644
--- a/api/shopping_v2.py
+++ b/api/shopping_v2.py
@@ -6,7 +6,7 @@ import aiosqlite
 from fastapi import APIRouter, Depends, Request, Response
 
 import shopping
-from api.deps import error_response, get_db, get_household_from_slug
+from api.deps import error_response, get_db, get_household_from_slug, get_current_user
 from api.shopping import (
     CurrentShoppingList,
     PurchasedShoppingList,
@@ -105,6 +105,7 @@ async def purchase_ingredients_scoped(
     shopping_list: PurchaseListIn,
     request: Request,
     household=Depends(get_household_from_slug),
+    user=Depends(get_current_user),
     conn: aiosqlite.Connection = Depends(get_db),
 ) -> PurchasedShoppingList | Response:
     hid = household["id"]
@@ -123,7 +124,9 @@ async def purchase_ingredients_scoped(
             )
         )
 
-    domain_list = shopping.ShoppingList(items=domain_items, store_name=shopping_list.store_name)
+    domain_list = shopping.ShoppingList(
+        items=domain_items, store_name=shopping_list.store_name, purchased_by_id=user.id
+    )
 
     try:
         # Use household-scoped purchase which ensures requests belong to the same household
diff --git a/backend-spec.md b/backend-spec.md
index a12e97b..a032cbb 100644
--- a/backend-spec.md
+++ b/backend-spec.md
@@ -2,7 +2,7 @@
   - GET `/api/v1/households/{householdSlug}/shopping/{listId}` returning purchased list + lookups scoped to household; cross-household returns 404.
   - POST `/api/v1/households/{householdSlug}/meals/{mealId}/consumed` marks a meal consumed within the household; validates timezone on provided `consumedDate`; clears outstanding meal requests only within that household.
   - Tests: `tests/test_meals_consumed_v2.py` validates scoping (requests cleared in same household, unaffected in other household). PASS.
-  - Tests: `tests/test_shopping_household_v2.py` verifies isolation of outstanding items; `tests/test_shopping_list_by_id_v2.py` verifies list-by-id scoping (PASS).
+  - Tests: `tests/test_shopping_household_v2.py` verifies isolation of outstanding items; `tests/test_shopping_list_by_id_v2.py` verifies list-by-id scoping; `tests/test_shopping_purchase_v2.py` covers scoped purchase (PASS).
 # Backend Specification: Household Multi-Tenancy (v2)
 
 This document has been validated against the current codebase (v1) to ensure the plan captures all required changes. It starts with a concise baseline of what exists today, then details the v2 multi-tenancy/auth refactor with concrete, file-scoped steps and acceptance criteria.
@@ -222,7 +222,7 @@ Impact on existing routes (exact files to refactor):
     - ✅ Refactor `main.py`:
       - Create a new `APIRouter` for household-scoped routes, e.g., `household_router = APIRouter(prefix="/api/v1/households/{householdSlug}")`.
       - Mounted a scoped helper endpoint and a new recipes v2 router under this prefix.
-    - ✅ Recipes scoping:
+  - ✅ Recipes scoping:
       - Added `api/recipes_v2.py` providing `/api/v1/households/{householdSlug}/recipes` with list/get/create.
       - Added scoped repo helpers in `recipes/repository.py` and exported via `recipes/__init__.py`.
       - Tests in `tests/test_recipes_household_v2.py` validate isolation across households (PASS).
@@ -237,7 +237,8 @@ Impact on existing routes (exact files to refactor):
       - GET `/api/v1/households/{householdSlug}/shopping/{listId}` returning purchased list + lookups scoped to household; cross-household returns 404.
       - POST `/api/v1/households/{householdSlug}/shopping` to purchase list items scoped to household; validates invariants and updates outstanding requests.
     - Scoped helpers in `shopping/repository.py` and `shopping/__init__.py` filter by `household_id` (find items, load list, purchased ingredients, and purchase_scoped).
-    - Tests: `tests/test_shopping_household_v2.py` (current isolation), `tests/test_shopping_list_by_id_v2.py` (list-by-id scoping), `tests/test_shopping_purchase_v2.py` (scoped purchase). PASS.
+  - Tests: `tests/test_shopping_household_v2.py` (current isolation), `tests/test_shopping_list_by_id_v2.py` (list-by-id scoping), `tests/test_shopping_purchase_v2.py` (scoped purchase). PASS.
+  - Notes: Normalized Ingredient.preparation to allow NULLs from DB (treated as empty string) to avoid 422 in v2 responses; set purchased_by_id in scoped purchase from JWT user.
   - ⏳ Update Repositories: ingredients, products to accept `household_id` and filter accordingly; extend meals create/update/consumed/delete and shopping write flows (purchase, requests) with scoping.
   - ⏳ Update Routers: move/duplicate remaining routers under the household router and wire `household_id` through.
   - **Acceptance**: The same queries as v1, when run under different household slugs and users, return isolated data sets; cross-household access yields 403.
diff --git a/ingredients/models.py b/ingredients/models.py
index c9178ce..0c9bac9 100644
--- a/ingredients/models.py
+++ b/ingredients/models.py
@@ -46,3 +46,9 @@ class Ingredient(ApiModel):
             except ValueError:
                 return v
         return v
+
+    # Backward compatibility: DB may contain NULL preparation; normalize to empty string
+    @field_validator("preparation", mode="before")
+    @classmethod
+    def _normalize_preparation(cls, v: Any) -> Any:
+        return "" if v is None else v
diff --git a/openapi.json b/openapi.json
index e67d396..2dfd8f1 100644
--- a/openapi.json
+++ b/openapi.json
@@ -1321,27 +1321,45 @@
         }
       }
     },
-    "/api/v1/auth/refresh": {
+    "/api/v1/auth/refresh-cookie": {
       "post": {
         "tags": [
-          "v2",
-          "auth-v2"
+          "v1",
+          "auth"
+        ],
+        "summary": "Refresh current user from cookie",
+        "operationId": "refresh",
+        "parameters": [
+          {
+            "name": "user_id",
+            "in": "cookie",
+            "required": true,
+            "schema": {
+              "type": "integer",
+              "title": "User Id"
+            }
+          }
         ],
-        "summary": "Refresh",
-        "operationId": "refreshV2",
         "responses": {
           "200": {
             "description": "Successful Response",
             "content": {
               "application/json": {
                 "schema": {
-                  "$ref": "#/components/schemas/RefreshResponse"
+                  "$ref": "#/components/schemas/Person"
                 }
               }
             }
           },
           "422": {
-            "$ref": "#/components/responses/Problem422"
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
           }
         },
         "security": [
@@ -1393,6 +1411,36 @@
         }
       }
     },
+    "/api/v1/auth/refresh": {
+      "post": {
+        "tags": [
+          "v2",
+          "auth-v2"
+        ],
+        "summary": "Refresh",
+        "operationId": "refreshV2",
+        "responses": {
+          "200": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/RefreshResponse"
+                }
+              }
+            }
+          },
+          "422": {
+            "$ref": "#/components/responses/Problem422"
+          }
+        },
+        "security": [
+          {
+            "cookieAuth": []
+          }
+        ]
+      }
+    },
     "/api/v1/auth/logout": {
       "post": {
         "tags": [