diff --git a/db/docs/batched_background_migrations/backfill_amazon_instance_audit_event_destinations.yml b/db/docs/batched_background_migrations/backfill_amazon_instance_audit_event_destinations.yml
index d7969c19452c072728a4ab63ffb972746d8184b4..6df3ffeb3b26f02711f8621f18d608c8ef792637 100644
--- a/db/docs/batched_background_migrations/backfill_amazon_instance_audit_event_destinations.yml
+++ b/db/docs/batched_background_migrations/backfill_amazon_instance_audit_event_destinations.yml
@@ -1,8 +1,9 @@
 ---
 migration_job_name: BackfillAmazonInstanceAuditEventDestinations
-description: Backfill the audit_events_instance_amazon_s3_configurations table to audit_events_instance_external_streaming_destinations
+description: Backfill the audit_events_instance_amazon_s3_configurations table to
+  audit_events_instance_external_streaming_destinations
 feature_category: audit_events
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184039
 milestone: '17.11'
 queued_migration_version: 20250310151216
-finalized_by: # version of the migration that finalized this BBM
+finalized_by: '20250902233106'
diff --git a/db/post_migrate/20250902233106_finalize_hk_backfill_amazon_instance_audit_event_destinations.rb b/db/post_migrate/20250902233106_finalize_hk_backfill_amazon_instance_audit_event_destinations.rb
new file mode 100644
index 0000000000000000000000000000000000000000..84ab5c41a2fbb8c108d6aa85c99c182423d80112
--- /dev/null
+++ b/db/post_migrate/20250902233106_finalize_hk_backfill_amazon_instance_audit_event_destinations.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class FinalizeHkBackfillAmazonInstanceAuditEventDestinations < Gitlab::Database::Migration[2.3]
+  milestone '18.4'
+
+  disable_ddl_transaction!
+
+  restrict_gitlab_migration gitlab_schema: :gitlab_main
+
+  def up
+    ensure_batched_background_migration_is_finished(
+      job_class_name: 'BackfillAmazonInstanceAuditEventDestinations',
+      table_name: :audit_events_instance_amazon_s3_configurations,
+      column_name: :id,
+      job_arguments: [],
+      finalize: true
+    )
+  end
+
+  def down; end
+end
diff --git a/db/schema_migrations/20250902233106 b/db/schema_migrations/20250902233106
new file mode 100644
index 0000000000000000000000000000000000000000..994d24c7baf131b4aae1a83bef5e56827b0f6859
--- /dev/null
+++ b/db/schema_migrations/20250902233106
@@ -0,0 +1 @@
+cae1d4aee0130b60b2cdb35e6de6d252c0f4a697d0b2e09b5ac525b527a1314e
\ No newline at end of file