Merge pull request #20222 from edx/bmedx/course_enrollment_history

Re-adding django-simple-history for CourseEnrollment

common/djangoapps/student/models.py

@@ -47,6 +47,7 @@ from model_utils.models import TimeStampedModel
 from opaque_keys.edx.django.models import CourseKeyField
 from opaque_keys.edx.keys import CourseKey
 from pytz import UTC
+from simple_history.models import HistoricalRecords
 from six import text_type
 from six.moves import range
 from six.moves.urllib.parse import urlencode
@@ -1130,6 +1131,14 @@ class CourseEnrollment(models.Model):
     # list of possible values.
     mode = models.CharField(default=CourseMode.DEFAULT_MODE_SLUG, max_length=100)
 
+    # An audit row will be created for every change to a CourseEnrollment. This
+    # will create a new model behind the scenes - HistoricalCourseEnrollment and a
+    # table named 'student_courseenrollment_history'.
+    history = HistoricalRecords(
+        history_id_field=models.UUIDField(default=uuid.uuid4),
+        table_name='student_courseenrollment_history'
+    )
+
     objects = CourseEnrollmentManager()
 
     # cache key format e.g enrollment.<username>.<course_key>.mode = 'honor'