Re Reschedule Delete Orphaned Deployments BG migration

This commit re-re schedule delete orphaned deployments BG migration.

Changelog: other

db/post_migrate/20211005010101_rereschedule_delete_orphaned_deployments.rb

+# frozen_string_literal: true
+
+class RerescheduleDeleteOrphanedDeployments < Gitlab::Database::Migration[1.0]
+  MIGRATION = 'DeleteOrphanedDeployments'
+  DELAY_INTERVAL = 2.minutes
+
+  disable_ddl_transaction!
+
+  # This is the third time to schedule `DeleteOrphanedDeployments` migration.
+  # The first time failed by an inappropriate batch size and the second time failed by a retry bug.
+  # Since there is no issue in this migration itself, we can simply requeue the
+  # migration jobs **without** no-op-ing the previous migration.
+  # See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69051#note_669230405 for more information.
+  def up
+    delete_queued_jobs(MIGRATION)
+
+    requeue_background_migration_jobs_by_range_at_intervals(MIGRATION, DELAY_INTERVAL)
+  end
+
+  def down
+    # no-op
+  end
+end

db/schema_migrations/20211005010101

+40e15593d9ee0fb5a59d1576c6da5a1eece265730f7ae15c5c81c2c5343b362c
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