feat: move errata tags

ietf/doc/migrations/0019_move_errata_tags.py

@@ -0,0 +1,29 @@
+# Copyright The IETF Trust 2023, All Rights Reserved
+
+from django.db import migrations
+
+from django.db.models import Subquery, OuterRef, F
+
+
+def forward(apps, schema_editor):
+    Document = apps.get_model("doc", "Document")
+    RelatedDocument = apps.get_model("doc", "RelatedDocument")
+    Document.tags.through.objects.filter(
+        doctagname_id__in=["errata", "verified-errata"], document__type_id="draft"
+    ).annotate(
+        rfcdoc=Subquery(
+            RelatedDocument.objects.filter(
+                relationship_id="became_rfc", source_id=OuterRef("document__pk")
+            ).values_list("target__pk", flat=True)[:1]
+        )
+    ).update(
+        document_id=F("rfcdoc")
+    )
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("doc", "0018_subseries"),
+    ]
+
+    operations = [migrations.RunPython(forward)]