Use BigInt primary keys on squashable models

casepro/statistics/migrations/0012_auto_20170904_1408.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.2 on 2017-09-04 14:08
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('statistics', '0011_auto_20170605_0657'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='dailycount',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+        migrations.AlterField(
+            model_name='dailysecondtotalcount',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+        migrations.AlterField(
+            model_name='totalcount',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+    ]

casepro/statistics/models.py

@@ -35,6 +35,8 @@ class BaseCount(models.Model):
     TYPE_CASE_OPENED = 'C'
     TYPE_CASE_CLOSED = 'D'
 
+    id = models.BigAutoField(auto_created=True, primary_key=True, verbose_name='ID')
+
     squash_sql = """
         WITH removed as (
             DELETE FROM %(table_name)s WHERE %(delete_cond)s RETURNING "count"