From 4544c3141f450840818f4619b2ebae3e5c7b7ece Mon Sep 17 00:00:00 2001
From: Nicolas Brichet <32258950+brichet@users.noreply.github.com>
Date: Fri, 1 Sep 2023 09:44:23 +0200
Subject: [PATCH] Backport PR #1823: Revert change breaking sqlalchemy 1.4.x

---
 nbgrader/api.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/nbgrader/api.py b/nbgrader/api.py
index af2fcbd85..6ec585bc3 100644
--- a/nbgrader/api.py
+++ b/nbgrader/api.py
@@ -9,7 +9,7 @@
                         DateTime, Interval, Float, Enum, UniqueConstraint,
                         Boolean, inspect, text)
 from sqlalchemy.orm import (sessionmaker, scoped_session, relationship,
-                            column_property, DeclarativeBase)
+                            column_property, declarative_base)
 from sqlalchemy.orm.exc import NoResultFound, FlushError
 from sqlalchemy.ext.associationproxy import association_proxy
 from sqlalchemy.exc import IntegrityError, StatementError
@@ -25,8 +25,7 @@
 from .auth import Authenticator
 
 
-class Base(DeclarativeBase):
-    pass
+Base = declarative_base()
 
 
 def new_uuid() -> str: