diff --git a/jupyter_cache/cache/db.py b/jupyter_cache/cache/db.py
index fd5cfc7..a2d9ba7 100644
--- a/jupyter_cache/cache/db.py
+++ b/jupyter_cache/cache/db.py
@@ -128,7 +128,9 @@ class NbProjectRecord(OrmBase):
     """A list of file assets required for the notebook to run."""
     exec_data = Column(JSON(), nullable=True)
     """Data on how to execute the notebook."""
-    created = Column(DateTime, nullable=False, default=lambda: datetime.datetime.now(datetime.UTC) )
+    created = Column(
+        DateTime, nullable=False, default=lambda: datetime.datetime.now(datetime.UTC)
+    )
     traceback = Column(Text(), nullable=True, default="")
     """A traceback is added if a notebook fails to execute fully."""
 
@@ -288,9 +290,14 @@ class NbCacheRecord(OrmBase):
     description = Column(String(255), nullable=False, default="")
     data = Column(JSON())
     """Extra data, such as the execution time."""
-    created = Column(DateTime, nullable=False, default=lambda: datetime.datetime.now(datetime.UTC))
+    created = Column(
+        DateTime, nullable=False, default=lambda: datetime.datetime.now(datetime.UTC)
+    )
     accessed = Column(
-        DateTime, nullable=False, default=lambda: datetime.datetime.now(datetime.UTC), onupdate=lambda: datetime.datetime.now(datetime.UTC)
+        DateTime,
+        nullable=False,
+        default=lambda: datetime.datetime.now(datetime.UTC),
+        onupdate=lambda: datetime.datetime.now(datetime.UTC),
     )
 
     def __repr__(self):