enhancement: add check against deleting of example users

Author: mantle-bearer

app/api/auth.py

@@ -190,6 +190,11 @@ def delete_me(
             status_code=status.HTTP_403_FORBIDDEN,
             detail="Admin users cannot delete themselves",
         )
+    if user.email == "user@example.com" or user.email == "admin@example.com":
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Cannot delete the example users",
+        )
     session.exec(delete(Item).where(Item.owner_id == user.id))
     session.delete(user)
     session.commit()