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app/sync/migrations/0003_auto_20201127_0838.py

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+# Generated by Django 3.1.3 on 2020-11-27 08:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sync', '0002_auto_20201126_0504'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='source',
+            name='key',
+            field=models.CharField(db_index=True, help_text='Source key, such as exact YouTube channel name or playlist ID', max_length=100, unique=True, verbose_name='key'),
+        ),
+    ]

app/sync/migrations/0004_remove_source_url.py

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+# Generated by Django 3.1.3 on 2020-11-28 03:11
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sync', '0003_auto_20201127_0838'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='source',
+            name='url',
+        ),
+    ]