update erd db and add display name to user access table

backend/apps/accounts/migrations/0005_user_display_name.py

@@ -0,0 +1,25 @@
+from django.db import migrations, models
+
+
+def backfill_display_name(apps, schema_editor):
+    User = apps.get_model("accounts", "User")
+    for user in User.objects.all().iterator():
+        if not (user.display_name or "").strip():
+            User.objects.filter(pk=user.pk).update(display_name=user.user_name)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("accounts", "0004_sync_status_flags"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="user",
+            name="display_name",
+            field=models.CharField(default="", max_length=100),
+            preserve_default=False,
+        ),
+        migrations.RunPython(backfill_display_name, migrations.RunPython.noop),
+    ]