1 files changed, 28 insertions, 0 deletions
diff --git a/db/post_migrate/20200826220746_schedule_populate_resolved_on_default_branch_column.rb b/db/post_migrate/20200826220746_schedule_populate_resolved_on_default_branch_column.rb
new file mode 100644
index 00000000000..6faa4fc8101
--- /dev/null
+++ b/db/post_migrate/20200826220746_schedule_populate_resolved_on_default_branch_column.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class SchedulePopulateResolvedOnDefaultBranchColumn < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  BATCH_SIZE = 100
+  DELAY_INTERVAL = 5.minutes.to_i
+  MIGRATION_CLASS = 'PopulateResolvedOnDefaultBranchColumn'
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab.ee?
+
+    EE::Gitlab::BackgroundMigration::PopulateResolvedOnDefaultBranchColumn::Vulnerability.distinct.each_batch(of: BATCH_SIZE, column: :project_id) do |batch, index|
+      project_ids = batch.pluck(:project_id)
+      migrate_in(index * DELAY_INTERVAL, MIGRATION_CLASS, project_ids)
+    end
+  end
+
+  def down
+    # no-op
+    # This migration schedules background tasks to populate
+    # `resolved_on_default_branch` column of `vulnerabilities`
+    # table so there is no rollback operation needed for this.
+  end
+end