diff --git a/analytics/migrations/0001_initial.py b/analytics/migrations/0001_initial.py
index 0329afe3e1..0e037375e3 100644
--- a/analytics/migrations/0001_initial.py
+++ b/analytics/migrations/0001_initial.py
@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 from django.db import models, migrations
+import django.db.models.deletion
 from django.conf import settings
 import zerver.lib.str_utils
 
@@ -26,13 +27,13 @@ class Migration(migrations.Migration):
             name='HuddleCount',
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('huddle', models.ForeignKey(to='zerver.Recipient')),
-                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
+                ('huddle', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='zerver.Recipient')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
                 ('property', models.CharField(max_length=40)),
                 ('end_time', models.DateTimeField()),
                 ('interval', models.CharField(max_length=20)),
                 ('value', models.BigIntegerField()),
-                ('anomaly', models.ForeignKey(to='analytics.Anomaly', null=True)),
+                ('anomaly', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='analytics.Anomaly', null=True)),
             ],
             bases=(zerver.lib.str_utils.ModelReprMixin, models.Model),
         ),
@@ -44,7 +45,7 @@ class Migration(migrations.Migration):
                 ('end_time', models.DateTimeField()),
                 ('interval', models.CharField(max_length=20)),
                 ('value', models.BigIntegerField()),
-                ('anomaly', models.ForeignKey(to='analytics.Anomaly', null=True)),
+                ('anomaly', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='analytics.Anomaly', null=True)),
             ],
             bases=(zerver.lib.str_utils.ModelReprMixin, models.Model),
         ),
@@ -52,12 +53,12 @@ class Migration(migrations.Migration):
             name='RealmCount',
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('realm', models.ForeignKey(to='zerver.Realm')),
+                ('realm', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='zerver.Realm')),
                 ('property', models.CharField(max_length=40)),
                 ('end_time', models.DateTimeField()),
                 ('interval', models.CharField(max_length=20)),
                 ('value', models.BigIntegerField()),
-                ('anomaly', models.ForeignKey(to='analytics.Anomaly', null=True)),
+                ('anomaly', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='analytics.Anomaly', null=True)),
 
             ],
             bases=(zerver.lib.str_utils.ModelReprMixin, models.Model),
@@ -66,13 +67,13 @@ class Migration(migrations.Migration):
             name='StreamCount',
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('realm', models.ForeignKey(to='zerver.Realm')),
-                ('stream', models.ForeignKey(to='zerver.Stream')),
+                ('realm', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='zerver.Realm')),
+                ('stream', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='zerver.Stream')),
                 ('property', models.CharField(max_length=40)),
                 ('end_time', models.DateTimeField()),
                 ('interval', models.CharField(max_length=20)),
                 ('value', models.BigIntegerField()),
-                ('anomaly', models.ForeignKey(to='analytics.Anomaly', null=True)),
+                ('anomaly', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='analytics.Anomaly', null=True)),
             ],
             bases=(zerver.lib.str_utils.ModelReprMixin, models.Model),
         ),
@@ -80,13 +81,13 @@ class Migration(migrations.Migration):
             name='UserCount',
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('realm', models.ForeignKey(to='zerver.Realm')),
-                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
+                ('realm', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='zerver.Realm')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
                 ('property', models.CharField(max_length=40)),
                 ('end_time', models.DateTimeField()),
                 ('interval', models.CharField(max_length=20)),
                 ('value', models.BigIntegerField()),
-                ('anomaly', models.ForeignKey(to='analytics.Anomaly', null=True)),
+                ('anomaly', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='analytics.Anomaly', null=True)),
             ],
             bases=(zerver.lib.str_utils.ModelReprMixin, models.Model),
         ),