storage backend reworked

cookbook/migrations/0003_recipeimport_storage.py

@@ -0,0 +1,20 @@
+# Generated by Django 2.0.5 on 2018-05-25 14:05
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cookbook', '0002_auto_20180525_1558'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='recipeimport',
+            name='storage',
+            field=models.ForeignKey(default=0, on_delete=django.db.models.deletion.PROTECT, to='cookbook.Storage'),
+            preserve_default=False,
+        ),
+    ]