Add internal_note field to Show model.

program/models.py

@@ -215,6 +215,7 @@ class Show(models.Model):
     default_playlist_id = models.IntegerField(blank=True, null=True)
     is_active = models.BooleanField(default=True)
     is_public = models.BooleanField(default=False)
+    internal_note = models.TextField(blank=True, null=True)
 
     class Meta:
         ordering = ("slug",)