Have syndications infer the correct Site from their URL rather than require an explicit Profile reference

entries/migrations/0012_auto_20180628_2044.py

@@ -0,0 +1,29 @@
+# Generated by Django 2.0.6 on 2018-06-28 10:44
+
+import computed_property.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('entries', '0011_auto_20171120_1108'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='syndication',
+            options={'ordering': ['domain']},
+        ),
+        migrations.RemoveField(
+            model_name='syndication',
+            name='profile',
+        ),
+        migrations.AddField(
+            model_name='syndication',
+            name='domain',
+            field=computed_property.fields.ComputedCharField(
+                compute_from='calc_domain', default='', editable=False, max_length=255),
+            preserve_default=False,
+        ),
+    ]