feat: complete auth/profile username migration and runtime safeguards

backend/tests/unit/database/test_base_repository.py

@@ -4,7 +4,7 @@ from datetime import datetime, timezone
 from uuid import UUID, uuid4
 
 import pytest
-from sqlalchemy import String
+from sqlalchemy import Column, String, Table
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -21,10 +21,19 @@ class Widget(SoftDeleteMixin, Base):
 
 @pytest.fixture
 async def db_engine():
+    auth_users = Table(
+        "users",
+        Base.metadata,
+        Column("id", String, primary_key=True),
+        schema="auth",
+        extend_existing=True,
+    )
     engine = create_async_engine("sqlite+aiosqlite:///:memory:", echo=False)
     async with engine.begin() as conn:
+        await conn.exec_driver_sql("ATTACH DATABASE ':memory:' AS auth")
         await conn.run_sync(Base.metadata.create_all)
     yield engine
+    Base.metadata.remove(auth_users)
     await engine.dispose()