Finalize asynchronously built index

Finalize and add schema for index from
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/83664

Changelog: performance

db/post_migrate/20220325000001_finalize_index_for_ci_job_artifacts_unlocked_with_expire_at.rb

+# frozen_string_literal: true
+
+class FinalizeIndexForCiJobArtifactsUnlockedWithExpireAt < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  TABLE_NAME = 'ci_job_artifacts'
+  INDEX_NAME = 'index_ci_job_artifacts_on_expire_at_for_removal'
+  CONDITIONS = 'locked = 0 AND expire_at IS NOT NULL'
+
+  def up
+    add_concurrent_index TABLE_NAME, [:expire_at], where: CONDITIONS, name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index_by_name TABLE_NAME, INDEX_NAME
+  end
+end

db/schema_migrations/20220325000001

+d9ad9c043faf278e33707baeccb5b7733aec408446b3dacf685e126309c4808c
\ No newline at end of file

db/structure.sql

@@ -27002,6 +27002,8 @@ CREATE INDEX index_ci_job_artifacts_id_for_terraform_reports ON ci_job_artifacts
 
 CREATE INDEX index_ci_job_artifacts_on_expire_at_and_job_id ON ci_job_artifacts USING btree (expire_at, job_id);
 
+CREATE INDEX index_ci_job_artifacts_on_expire_at_for_removal ON ci_job_artifacts USING btree (expire_at) WHERE ((locked = 0) AND (expire_at IS NOT NULL));
+
 CREATE INDEX index_ci_job_artifacts_on_file_store ON ci_job_artifacts USING btree (file_store);
 
 CREATE INDEX index_ci_job_artifacts_on_file_type_for_devops_adoption ON ci_job_artifacts USING btree (file_type, project_id, created_at) WHERE (file_type = ANY (ARRAY[5, 6, 8, 23]));