diff --git a/db/docs/batched_background_migrations/backfill_members_request_accepted_at.yml b/db/docs/batched_background_migrations/backfill_members_request_accepted_at.yml
new file mode 100644
index 0000000000000000000000000000000000000000..1be05b8459f2b99c6e2e6c5571086afead1fe9e3
--- /dev/null
+++ b/db/docs/batched_background_migrations/backfill_members_request_accepted_at.yml
@@ -0,0 +1,8 @@
+---
+migration_job_name: BackfillMembersRequestAcceptedAt
+description: Backfills `request_accepted_at` column in the `members` table to `created_at` column value for all existing records.
+feature_category: groups_and_projects
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166812
+milestone: '17.5'
+queued_migration_version: 20240920083708
+finalized_by:
diff --git a/db/post_migrate/20240920083708_queue_backfill_members_request_accepted_at.rb b/db/post_migrate/20240920083708_queue_backfill_members_request_accepted_at.rb
new file mode 100644
index 0000000000000000000000000000000000000000..f5f076ca646eea3bb55e2842f3098389cd70d82b
--- /dev/null
+++ b/db/post_migrate/20240920083708_queue_backfill_members_request_accepted_at.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class QueueBackfillMembersRequestAcceptedAt < Gitlab::Database::Migration[2.2]
+ milestone '17.5'
+ restrict_gitlab_migration gitlab_schema: :gitlab_main
+
+ MIGRATION = "BackfillMembersRequestAcceptedAt"
+ DELAY_INTERVAL = 2.minutes
+ BATCH_SIZE = 1000
+ SUB_BATCH_SIZE = 100
+
+ def up
+ queue_batched_background_migration(
+ MIGRATION,
+ :members,
+ :id,
+ job_interval: DELAY_INTERVAL,
+ batch_size: BATCH_SIZE,
+ sub_batch_size: SUB_BATCH_SIZE
+ )
+ end
+
+ def down
+ delete_batched_background_migration(MIGRATION, :members, :id, [])
+ end
+end
diff --git a/db/schema_migrations/20240920083708 b/db/schema_migrations/20240920083708
new file mode 100644
index 0000000000000000000000000000000000000000..48c0148798e55ba849adc2fedd066845715d756b
--- /dev/null
+++ b/db/schema_migrations/20240920083708
@@ -0,0 +1 @@
+487b9bcc614eef44330b4c5024b0b9383a6271981f436fda86a0d95b93689e70
\ No newline at end of file
diff --git a/lib/gitlab/background_migration/backfill_members_request_accepted_at.rb b/lib/gitlab/background_migration/backfill_members_request_accepted_at.rb
new file mode 100644
index 0000000000000000000000000000000000000000..d57d507cf02094ff106eceb8b67edd308efeb968
--- /dev/null
+++ b/lib/gitlab/background_migration/backfill_members_request_accepted_at.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Gitlab
+ module BackgroundMigration
+ class BackfillMembersRequestAcceptedAt < BatchedMigrationJob
+ operation_name :backfill_members_request_accepted_at
+ feature_category :groups_and_projects
+
+ def perform
+ each_sub_batch do |sub_batch|
+ sub_batch
+ .where(requested_at: nil)
+ .where(invite_token: nil)
+ .where(invite_accepted_at: nil)
+ .where(request_accepted_at: nil)
+ .update_all("request_accepted_at = created_at")
+ end
+ end
+ end
+ end
+end
diff --git a/spec/lib/gitlab/background_migration/backfill_members_request_accepted_at_spec.rb b/spec/lib/gitlab/background_migration/backfill_members_request_accepted_at_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..ce983408bdd60e499281b2f2ec9215d16f20db3f
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/backfill_members_request_accepted_at_spec.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::BackgroundMigration::BackfillMembersRequestAcceptedAt, schema: 20240920083708, feature_category: :groups_and_projects do
+ let!(:namespace) { table(:namespaces).create!({ name: "test-1", path: "test-1", owner_id: 1 }) }
+ let!(:member) { table(:members) }
+ let!(:member_data) do
+ {
+ access_level: ::Gitlab::Access::MAINTAINER,
+ member_namespace_id: namespace.id,
+ notification_level: 3,
+ source_type: "Namespace",
+ source_id: 22,
+ created_at: "2024-09-14 06:06:16.649264"
+ }
+ end
+
+ let!(:member1) { member.create!(member_data) }
+ let!(:member2) { member.create!(member_data) }
+ let!(:member3) { member.create!(member_data.merge(requested_at: Time.current)) }
+ let!(:member4) { member.create!(member_data.merge(invite_token: 'token')) }
+ let!(:member5) { member.create!(member_data.merge(request_accepted_at: Time.current)) }
+ let!(:member6) { member.create!(member_data.merge(invite_accepted_at: Time.current)) }
+
+ subject(:migration) do
+ described_class.new(
+ start_id: member1.id,
+ end_id: member6.id,
+ batch_table: :members,
+ batch_column: :id,
+ sub_batch_size: 100,
+ pause_ms: 0,
+ connection: ApplicationRecord.connection
+ )
+ end
+
+ describe '#perform' do
+ context 'when `requested_at`, `invite_token`, `invite_accepted_at` and `request_accepted_at` are set to nil' do
+ it 'backfills `request_accepted_at` column to `created_at` for eligible members' do
+ expect { migration.perform }
+ .to change { member1.reload.request_accepted_at }.from(nil).to(member1.created_at)
+ .and change { member2.reload.request_accepted_at }.from(nil).to(member2.created_at)
+ .and not_change { member3.reload.request_accepted_at }
+ .and not_change { member4.reload.request_accepted_at }
+ .and not_change { member5.reload.request_accepted_at }
+ .and not_change { member6.reload.request_accepted_at }
+ end
+ end
+ end
+end
diff --git a/spec/migrations/20240920083708_queue_backfill_members_request_accepted_at_spec.rb b/spec/migrations/20240920083708_queue_backfill_members_request_accepted_at_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..00235d0d4b1c1970070d8d690fd14376f911f722
--- /dev/null
+++ b/spec/migrations/20240920083708_queue_backfill_members_request_accepted_at_spec.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require_migration!
+
+RSpec.describe QueueBackfillMembersRequestAcceptedAt, feature_category: :groups_and_projects do
+ let!(:batched_migration) { described_class::MIGRATION }
+
+ it 'schedules a new batched migration' do
+ reversible_migration do |migration|
+ migration.before -> {
+ expect(batched_migration).not_to have_scheduled_batched_migration
+ }
+
+ migration.after -> {
+ expect(batched_migration).to have_scheduled_batched_migration(
+ table_name: :members,
+ column_name: :id,
+ interval: described_class::DELAY_INTERVAL,
+ batch_size: described_class::BATCH_SIZE,
+ sub_batch_size: described_class::SUB_BATCH_SIZE
+ )
+ }
+ end
+ end
+end