diff --git a/combo/data/migrations/0044_validity_info.py b/combo/data/migrations/0044_validity_info.py
new file mode 100644
index 00000000..191dafbc
--- /dev/null
+++ b/combo/data/migrations/0044_validity_info.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('data', '0043_delete_externallinksearchitem'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ValidityInfo',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('object_id', models.PositiveIntegerField()),
+                ('invalid_reason_code', models.CharField(blank=True, editable=False, max_length=100, null=True)),
+                ('invalid_since', models.DateTimeField(blank=True, editable=False, null=True)),
+                ('content_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='contenttypes.ContentType')),
+            ],
+        ),
+        migrations.AlterUniqueTogether(
+            name='validityinfo',
+            unique_together=set([('content_type', 'object_id')]),
+        ),
+    ]
diff --git a/combo/data/models.py b/combo/data/models.py
index 00867d94..93f26212 100644
--- a/combo/data/models.py
+++ b/combo/data/models.py
@@ -30,6 +30,9 @@ import subprocess
 from django.apps import apps
 from django.conf import settings
 from django.contrib.auth.models import Group
+from django.contrib.contenttypes.fields import GenericForeignKey
+from django.contrib.contenttypes.fields import GenericRelation
+from django.contrib.contenttypes.models import ContentType
 from django.core.cache import cache
 from django.core.exceptions import ObjectDoesNotExist, ValidationError, PermissionDenied
 from django.core import serializers
@@ -526,6 +529,18 @@ class Redirect(models.Model):
         ordering = ('creation_timestamp',)
 
 
+class ValidityInfo(models.Model):
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
+    object_id = models.PositiveIntegerField()
+    content_object = GenericForeignKey('content_type', 'object_id')
+
+    invalid_reason_code = models.CharField(max_length=100, blank=True, null=True, editable=False)
+    invalid_since = models.DateTimeField(blank=True, null=True, editable=False)
+
+    class Meta:
+        unique_together = [('content_type', 'object_id')]
+
+
 class CellMeta(MediaDefiningClass, ModelBase):
     pass
 
@@ -548,6 +563,8 @@ class CellBase(six.with_metaclass(CellMeta, models.Model)):
     groups = models.ManyToManyField(Group, verbose_name=_('Groups'), blank=True)
     last_update_timestamp = models.DateTimeField(auto_now=True)
 
+    validity_info = GenericRelation(ValidityInfo)
+
     default_form_class = None
     manager_form_factory_kwargs = {}
     manager_form_template = 'combo/cell_form.html'