[Update] ops adhoc date_created index (#2223)

apps/ops/migrations/0005_auto_20181219_1807.py

+# Generated by Django 2.1 on 2018-12-19 10:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ops', '0004_adhoc_run_as'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='task',
+            name='date_created',
+            field=models.DateTimeField(auto_now_add=True, db_index=True),
+        ),
+    ]

apps/ops/models/adhoc.py

@@ -42,7 +42,7 @@ class Task(models.Model):
     is_deleted = models.BooleanField(default=False)
     comment = models.TextField(blank=True, verbose_name=_("Comment"))
     created_by = models.CharField(max_length=128, blank=True, default='')
-    date_created = models.DateTimeField(auto_now_add=True)
+    date_created = models.DateTimeField(auto_now_add=True, db_index=True)
     __latest_adhoc = None
     _ignore_auto_created_by = True