adding model

lms/djangoapps/instructor_task/admin.py

@@ -5,8 +5,10 @@ This will mostly involve searching by course_id or task_id and manually failing
 a task.
 
 """
+from config_models.admin import ConfigurationModelAdmin
 from django.contrib import admin
 from .models import InstructorTask
+from .config.models import GradeReportSetting
 
 
 class InstructorTaskAdmin(admin.ModelAdmin):
@@ -34,3 +36,4 @@ class InstructorTaskAdmin(admin.ModelAdmin):
     email.admin_order_field = 'requester__username'
 
 admin.site.register(InstructorTask, InstructorTaskAdmin)
+admin.site.register(GradeReportSetting, ConfigurationModelAdmin)

lms/djangoapps/instructor_task/config/models.py

+"""
+Models for configuration of settings relevant
+to instructor tasks.
+"""
+from config_models.models import ConfigurationModel
+from django.db.models import IntegerField
+
+
+class GradeReportSetting(ConfigurationModel):
+    """
+    Sets the batch size used when running grade reports
+    with multiple celery workers.
+    """
+    batch_size = IntegerField(default=100)

lms/djangoapps/instructor_task/migrations/0002_gradereportsetting.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('instructor_task', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='GradeReportSetting',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('change_date', models.DateTimeField(auto_now_add=True, verbose_name='Change date')),
+                ('enabled', models.BooleanField(default=False, verbose_name='Enabled')),
+                ('batch_size', models.IntegerField(default=100)),
+                ('changed_by', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, editable=False, to=settings.AUTH_USER_MODEL, null=True, verbose_name='Changed by')),
+            ],
+            options={
+                'ordering': ('-change_date',),
+                'abstract': False,
+            },
+        ),
+    ]