diff --git a/backend-spec.md b/backend-spec.md
index e6f1de6..f785382 100644
--- a/backend-spec.md
+++ b/backend-spec.md
@@ -353,3 +353,4 @@ Implementation policy updates (2025-11-01):
 Outstanding cleanup:
 - Remove remaining `Person` fallbacks in domain repositories and delete the `persons/` package once tests are migrated. Ensure no code paths depend on `cookie_person`.
 - Consider adding versioning endpoints for recipes explicitly rather than overloading POST.
+ - Add a temporary test helper to seed `User`/`HouseholdMember` rows from legacy `Person` when needed (now available as `tests/user_fixtures.py`). Use this to migrate tests off `persons` before deleting the package.
diff --git a/tests/user_fixtures.py b/tests/user_fixtures.py
new file mode 100644
index 0000000..777dd1c
--- /dev/null
+++ b/tests/user_fixtures.py
@@ -0,0 +1,47 @@
+from __future__ import annotations
+
+import aiosqlite
+
+
+async def seed_users_from_legacy_persons(conn: aiosqlite.Connection):
+    """Seed User and HouseholdMember from legacy test persons if present.
+
+    This is a no-op if the Person table is empty or missing.
+    """
+    # Ensure required tables exist
+    try:
+        await conn.execute("SELECT 1 FROM User LIMIT 1")
+        await conn.execute("SELECT 1 FROM Household LIMIT 1")
+        await conn.execute("SELECT 1 FROM HouseholdMember LIMIT 1")
+    except Exception:
+        return
+
+    # If any users exist already, do nothing
+    async with conn.execute("SELECT COUNT(1) FROM User") as c:
+        row = await c.fetchone()
+        if row and int(row[0]) > 0:
+            return
+
+    # Default household id (created by migration/bootstrap)
+    async with conn.execute("SELECT id FROM Household WHERE slug = 'default' LIMIT 1") as c:
+        row = await c.fetchone()
+        if not row:
+            return
+        hid = int(row[0])
+
+    # Copy over Person rows into User and create membership
+    try:
+        async with conn.execute("SELECT id, name FROM Person") as cur:
+            async for pid, name in cur:
+                email = f"{str(name).lower()}@example.com"
+                await conn.execute(
+                    "INSERT OR IGNORE INTO User (id, email, display_name) VALUES (?, ?, ?)",
+                    (int(pid), email, str(name)),
+                )
+                await conn.execute(
+                    "INSERT OR IGNORE INTO HouseholdMember (user_id, household_id, role) VALUES (?, ?, 'admin')",
+                    (int(pid), hid),
+                )
+    except Exception:
+        # Person table may not exist in some contexts; ignore
+        return
diff --git a/users/repository.py b/users/repository.py
index 2b1f9ce..908004f 100644
--- a/users/repository.py
+++ b/users/repository.py
@@ -91,6 +91,16 @@ async def insert_user(conn, email: str, display_name: str, profile_photo_url: st
     return user_id
 
 
+async def insert_user_with_id(
+    conn, user_id: int, email: str, display_name: str, profile_photo_url: str | None = None
+):
+    """Insert a user with an explicit id (primarily for tests/fixtures)."""
+    await conn.execute(
+        "INSERT OR REPLACE INTO User (id, email, display_name, profile_photo_url) VALUES (?, ?, ?, ?)",
+        (user_id, email, display_name, profile_photo_url),
+    )
+
+
 async def set_local_credentials(conn, user_id: int, hashed_password: str):
     await conn.execute(
         "INSERT OR REPLACE INTO LocalCredentials (user_id, hashed_password) VALUES (?, ?)",