diff --git a/db/docs/batched_background_migrations/backfill_security_findings_project_id.yml b/db/docs/batched_background_migrations/backfill_security_findings_project_id.yml
index 9c0c87fb91143689ac265505cb20ec80938f281d..3e4a3a1923e1a5ecaf80ca735a8d3515db8f4e78 100644
--- a/db/docs/batched_background_migrations/backfill_security_findings_project_id.yml
+++ b/db/docs/batched_background_migrations/backfill_security_findings_project_id.yml
@@ -5,4 +5,4 @@ feature_category: vulnerability_management
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169121
 milestone: '17.6'
 queued_migration_version: 20241014114624
-finalized_by: # version of the migration that finalized this BBM
+finalized_by: '20250710205206'
diff --git a/db/post_migrate/20250710205206_finalize_backfill_security_findings_project_id.rb b/db/post_migrate/20250710205206_finalize_backfill_security_findings_project_id.rb
new file mode 100644
index 0000000000000000000000000000000000000000..5388d39e6d59a0e5a1ed1200f2f78c115bf204d0
--- /dev/null
+++ b/db/post_migrate/20250710205206_finalize_backfill_security_findings_project_id.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class FinalizeBackfillSecurityFindingsProjectId < Gitlab::Database::Migration[2.3]
+  milestone '18.3'
+  disable_ddl_transaction!
+
+  restrict_gitlab_migration gitlab_schema: :gitlab_main_cell
+
+  def up
+    ensure_batched_background_migration_is_finished(
+      job_class_name: 'BackfillSecurityFindingsProjectId',
+      table_name: :security_findings,
+      column_name: :id,
+      job_arguments: [:project_id, :vulnerability_scanners, :project_id, :scanner_id],
+      finalize: true
+    )
+  end
+
+  def down; end
+end
diff --git a/db/schema_migrations/20250710205206 b/db/schema_migrations/20250710205206
new file mode 100644
index 0000000000000000000000000000000000000000..159594a3452b537cd3bb90939c18cee639bae069
--- /dev/null
+++ b/db/schema_migrations/20250710205206
@@ -0,0 +1 @@
+0f96d4d2b5524800fd2ee2230f9186559f83b994df73e07c2042926f8fa5daf5
\ No newline at end of file