Remove artifact expiry temp index

changelogs/unreleased/mc-backstage-remove-artifact-expiry-temp-index.yml

+---
+title: Remove artifact expiry backfill temp index.
+merge_request: 54252
+author:
+type: changed

db/migrate/20210215172449_remove_artifact_expiry_temp_index.rb

+# frozen_string_literal: true
+
+class RemoveArtifactExpiryTempIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'expired_artifacts_temp_index'
+  INDEX_CONDITION = "expire_at IS NULL AND date(created_at AT TIME ZONE 'UTC') < '2020-06-22'::date"
+
+  def up
+    remove_concurrent_index_by_name :ci_job_artifacts, INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index(:ci_job_artifacts, %i(id created_at), where: INDEX_CONDITION, name: INDEX_NAME)
+  end
+end

db/schema_migrations/20210215172449

+f72f0a31bca545d2528030019695b03e0858d7ae9a0fb32d407c25580731fa6b
\ No newline at end of file

db/structure.sql

@@ -21775,8 +21775,6 @@ CREATE UNIQUE INDEX epic_user_mentions_on_epic_id_and_note_id_index ON epic_user
 
 CREATE UNIQUE INDEX epic_user_mentions_on_epic_id_index ON epic_user_mentions USING btree (epic_id) WHERE (note_id IS NULL);
 
-CREATE INDEX expired_artifacts_temp_index ON ci_job_artifacts USING btree (id, created_at) WHERE ((expire_at IS NULL) AND (date(timezone('UTC'::text, created_at)) < '2020-06-22'::date));
-
 CREATE INDEX finding_evidence_requests_on_finding_evidence_id ON vulnerability_finding_evidence_requests USING btree (vulnerability_finding_evidence_id);
 
 CREATE INDEX finding_evidences_on_vulnerability_occurrence_id ON vulnerability_finding_evidences USING btree (vulnerability_occurrence_id);