Seating: Support custom row and seat labels

src/pretix/base/migrations/0143_auto_20200217_1211.py

@@ -0,0 +1,28 @@
+# Generated by Django 2.2.4 on 2020-02-17 12:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0142_auto_20191215_1522'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='seat',
+            name='row_label',
+            field=models.CharField(max_length=190, null=True),
+        ),
+        migrations.AddField(
+            model_name='seat',
+            name='seat_label',
+            field=models.CharField(max_length=190, null=True),
+        ),
+        migrations.AlterField(
+            model_name='giftcard',
+            name='secret',
+            field=models.CharField(db_index=True, max_length=190),
+        ),
+    ]