fix: migrate the legacy StreamName

ietf/name/fixtures/names.json

@@ -3464,7 +3464,7 @@
       "parent_types": [],
       "req_subm_approval": true,
       "role_order": "[\n    \"chair\",\n    \"delegate\"\n]",
-      "session_purposes": "[\n    \"officehours\"\n]",
+      "session_purposes": "[\n    \"officehours\",\n    \"regular\"\n]",
       "show_on_agenda": true
     },
     "model": "group.groupfeatures",

ietf/name/migrations/0014_change_legacy_stream_desc.py

@@ -0,0 +1,21 @@
+# Copyright The IETF Trust 2024, All Rights Reserved
+
+from django.db import migrations
+
+def forward(apps, schema_editor):
+    StreamName = apps.get_model("name", "StreamName")
+    StreamName.objects.filter(pk="legacy").update(desc="Legacy")
+
+def reverse(apps, schema_editor):
+    StreamName = apps.get_model("name", "StreamName")
+    StreamName.objects.filter(pk="legacy").update(desc="Legacy stream")
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("name", "0013_narrativeminutes"),
+    ]
+
+    operations = [
+        migrations.RunPython(forward, reverse)
+    ]