chore(model): add slack user id in admin panel.

This commit adds the `slack_user_id` field to the Django admin panel for the User model.
The field is now configured to be blankable but not nullable, which is the opposite of its
previous configuration.

Author: sandeshit

apps/user/admin.py

@@ -49,6 +49,7 @@ class UserAdmin(DjangoUserAdmin):  # type: ignore[reportMissingTypeArgument]
                     "last_name",
                     "display_name",
                     "contributor_user",
+                    "slack_user_id",
                 ),
             },
         ),

apps/user/migrations/0003_alter_user_slack_user_id.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.5 on 2025-10-08 08:47
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('user', '0002_user_slack_user_id'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='slack_user_id',
+            field=models.CharField(blank=True, max_length=20),
+        ),
+    ]

apps/user/models.py

@@ -43,7 +43,7 @@ class User(AbstractUser):
     )
 
     objects: CustomUserManager = CustomUserManager()  # type: ignore[reportAssignmentType]
-    slack_user_id = models.CharField(max_length=20, null=True, blank=False)
+    slack_user_id = models.CharField(max_length=20, null=False, blank=True)
 
     # type hints
     pk: int