Make CharFields not nullable. The Right Way.

1. remove the fields
2. re-add the fields as not-nullable.

program/migrations/0055_auto_20230419_0015.py

+# Generated by Django 3.2.18 on 2023-04-18 22:15
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('program', '0054_alter_schedule_last_date'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='host',
+            name='updated_by',
+        ),
+        migrations.RemoveField(
+            model_name='note',
+            name='updated_by',
+        ),
+        migrations.RemoveField(
+            model_name='show',
+            name='updated_by',
+        ),
+        migrations.RemoveField(
+            model_name='userprofile',
+            name='updated_by',
+        ),
+    ]

program/migrations/0056_auto_20230419_0017.py

+# Generated by Django 3.2.18 on 2023-04-18 22:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('program', '0055_auto_20230419_0015'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='host',
+            name='updated_by',
+            field=models.CharField(blank=True, default='', max_length=150),
+        ),
+        migrations.AddField(
+            model_name='note',
+            name='updated_by',
+            field=models.CharField(blank=True, default='', max_length=150),
+        ),
+        migrations.AddField(
+            model_name='show',
+            name='updated_by',
+            field=models.CharField(blank=True, default='', max_length=150),
+        ),
+        migrations.AddField(
+            model_name='userprofile',
+            name='updated_by',
+            field=models.CharField(blank=True, default='', max_length=150),
+        ),
+    ]

program/models.py

@@ -152,7 +152,7 @@ class Host(models.Model):
     is_active = models.BooleanField(default=True)
     name = models.CharField(max_length=128)
     updated_at = models.DateTimeField(auto_now=True, blank=True, null=True)
-    updated_by = models.CharField(blank=True, max_length=150, null=True)
+    updated_by = models.CharField(blank=True, default="", max_length=150)
 
     class Meta:
         ordering = ("name",)
@@ -244,7 +244,7 @@ class Show(models.Model):
         Type, blank=True, null=True, on_delete=models.CASCADE, related_name="shows"
     )
     updated_at = models.DateTimeField(auto_now=True, blank=True, null=True)
-    updated_by = models.CharField(blank=True, max_length=150, null=True)
+    updated_by = models.CharField(blank=True, default="", max_length=150)
 
     class Meta:
         ordering = ("slug",)
@@ -474,7 +474,7 @@ class Note(models.Model):
     timeslot = models.OneToOneField(TimeSlot, on_delete=models.CASCADE, unique=True)
     title = models.CharField(max_length=128)
     updated_at = models.DateTimeField(auto_now=True, blank=True, null=True)
-    updated_by = models.CharField(blank=True, max_length=150, null=True)
+    updated_by = models.CharField(blank=True, default="", max_length=150)
 
     class Meta:
         ordering = ("timeslot",)
@@ -500,7 +500,7 @@ class UserProfile(models.Model):
     created_at = models.DateTimeField(auto_now_add=True)
     created_by = models.CharField(max_length=150)
     updated_at = models.DateTimeField(auto_now=True, blank=True, null=True)
-    updated_by = models.CharField(blank=True, max_length=150, null=True)
+    updated_by = models.CharField(blank=True, default="", max_length=150)
     user = models.OneToOneField(
         User,
         on_delete=models.CASCADE,