diff --git a/finance/migrations/0011_auto_20180507_1412.py b/finance/migrations/0011_auto_20180507_1412.py
new file mode 100644
index 0000000..e11255a
--- /dev/null
+++ b/finance/migrations/0011_auto_20180507_1412.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2018-05-07 14:12
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('finance', '0010_auto_20180412_1628'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='bill',
+            name='opener',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to=settings.AUTH_USER_MODEL, verbose_name='Ответственный сотрудник'),
+        ),
+    ]
diff --git a/finance/models.py b/finance/models.py
index e824ea3..2edf8fe 100755
--- a/finance/models.py
+++ b/finance/models.py
@@ -17,7 +17,9 @@ logger_business_rules = logging.getLogger('business_rules')
 class Bill(models.Model):
     course_token = models.UUIDField(verbose_name="Токен курса", editable=False)
     user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name='Плательщик', related_name='bill_user')
-    opener = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name='Ответственный сотрудник', null=True)
+    opener = models.ForeignKey(
+        settings.AUTH_USER_MODEL, verbose_name='Ответственный сотрудник', null=True, blank=True,
+        on_delete=models.SET_NULL)
     comment = models.TextField(verbose_name='Комментарий продавца', help_text='Будет показано пользователю',
                                blank=True, editable=False)
     description = models.TextField(verbose_name='Внутренняя заметка', blank=True)
diff --git a/progress/migrations/0014_auto_20180507_1412.py b/progress/migrations/0014_auto_20180507_1412.py
new file mode 100644
index 0000000..07cf083
--- /dev/null
+++ b/progress/migrations/0014_auto_20180507_1412.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2018-05-07 14:12
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('progress', '0013_progresslesson_dif_check_timestamps'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='progresslesson',
+            name='last_update',
+            field=models.DateTimeField(auto_now_add=True, verbose_name='Дата последней сдачи'),
+        ),
+    ]