address feedback

openedx/core/djangoapps/content/course_overviews/models.py

@@ -226,11 +226,22 @@ class CourseOverview(TimeStampedModel):
                         ])
                         CourseOverviewImageSet.create_or_update(course_overview, course)
 
+                except IntegrityError:
+                    # There is a rare race condition that will occur if
+                    # CourseOverview.get_from_id is called while a
+                    # another identical overview is already in the process
+                    # of being created.
+                    # One of the overviews will be saved normally, while the
+                    # other one will cause an IntegrityError because it tries
+                    # to save a duplicate.
+                    # (see: https://openedx.atlassian.net/browse/TNL-2854).
+                    pass
                 except Exception:  # pylint: disable=broad-except
                     log.exception(
                         "CourseOverview for course %s failed!",
                         course_id,
                     )
+                    raise
 
                 return course_overview
             elif course is not None: