fix(organizations): reconcile stale demo source links

src/organizations/test_companies.py

@@ -200,6 +200,25 @@ class TestCompanyDatasetService:
                     f"{legacy_module}.{legacy_record.__class__.__name__}"
                 )
                 record.legacy_pk = str(legacy_record.pk)
+                legacy_owner = (
+                    OrganizationSourceRecord.objects.filter(
+                        legacy_model=record.legacy_model,
+                        legacy_pk=record.legacy_pk,
+                    )
+                    .exclude(pk=record.pk)
+                    .select_related("extension")
+                    .first()
+                )
+                if legacy_owner is not None:
+                    if (
+                        legacy_owner.source != source
+                        or legacy_owner.extension.organization_id != organization.pk
+                    ):
+                        raise RuntimeError(
+                            "Legacy parser record is already linked to another "
+                            "organization source record"
+                        )
+                    legacy_owner.delete()
                 record.save(update_fields=["legacy_model", "legacy_pk", "updated_at"])
                 if source == ParserLoadLog.Source.FNS_REPORTS:
                     cls._refresh_financial_lines(