Mgmt commands to clear data from historical tables.

lms/djangoapps/verify_student/management/commands/delete_historical_verify_student_data.py

@@ -0,0 +1,27 @@
+"""
+Command to delete all rows from the verify_student_historicalverificationdeadline table.
+"""
+
+import logging
+from verify_student.models import VerificationDeadline
+from openedx.core.djangoapps.util.row_delete import delete_rows, BaseDeletionCommand
+log = logging.getLogger(__name__)
+
+
+class Command(BaseDeletionCommand):
+    """
+    Example usage: ./manage.py lms --settings=devstack delete_historical_verify_student_data
+    """
+    help = 'Deletes all historical VerificationDeadline rows (in chunks).'
+
+    def handle(self, *args, **options):
+        """
+        Deletes rows, chunking the deletes to avoid long table/row locks.
+        """
+        chunk_size, sleep_between = super(Command, self).handle(*args, **options)
+        delete_rows(
+            VerificationDeadline.objects,
+            'verify_student_historicalverificationdeadline',
+            'history_id',
+            chunk_size, sleep_between
+        )