Prepare deployments table for bigint conversion

Adds bigint column and triggers to prepare for bigint conversion

Changelog: other
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62459

app/models/deployment.rb

@@ -8,6 +8,9 @@ class Deployment < ApplicationRecord
   include Importable
   include Gitlab::Utils::StrongMemoize
   include FastDestroyAll
+  include IgnorableColumns
+
+  ignore_column :deployable_id_convert_to_bigint, remove_with: '14.2', remove_after: '2021-08-22'
 
   belongs_to :project, required: true
   belongs_to :environment, required: true

db/migrate/20210525085158_initialize_conversion_of_deployments_to_bigint.rb

+# frozen_string_literal: true
+
+class InitializeConversionOfDeploymentsToBigint < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  TABLE = :deployments
+  COLUMNS = %i(deployable_id)
+
+  def up
+    initialize_conversion_of_integer_to_bigint(TABLE, COLUMNS)
+  end
+
+  def down
+    revert_initialize_conversion_of_integer_to_bigint(TABLE, COLUMNS)
+  end
+end

db/migrate/20210525085325_backfill_deployments_for_bigint_conversion.rb

+# frozen_string_literal: true
+
+class BackfillDeploymentsForBigintConversion < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  TABLE = :deployments
+  COLUMNS = %i(deployable_id)
+
+  def up
+    backfill_conversion_of_integer_to_bigint TABLE, COLUMNS
+  end
+
+  def down
+    revert_backfill_conversion_of_integer_to_bigint TABLE, COLUMNS
+  end
+end

db/schema_migrations/20210525085158

+a2ce644df46a13d65eb0d01931eeb8e9f43967daadf73eed2f033b6c275ca57d
\ No newline at end of file

db/schema_migrations/20210525085325

+f085c9a7fc2209cf4d3797cda55c2be76b462eff456e7bf92de4545e0b988053
\ No newline at end of file

db/structure.sql

@@ -143,6 +143,15 @@ BEGIN
 END;
 $$;
 
+CREATE FUNCTION trigger_77f5e1d20482() RETURNS trigger
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+  NEW."deployable_id_convert_to_bigint" := NEW."deployable_id";
+  RETURN NEW;
+END;
+$$;
+
 CREATE FUNCTION trigger_8485e97c00e3() RETURNS trigger
     LANGUAGE plpgsql
     AS $$
@@ -12288,7 +12297,8 @@ CREATE TABLE deployments (
     on_stop character varying,
     status smallint NOT NULL,
     finished_at timestamp with time zone,
-    cluster_id integer
+    cluster_id integer,
+    deployable_id_convert_to_bigint bigint
 );
 
 CREATE SEQUENCE deployments_id_seq
@@ -25277,6 +25287,8 @@ CREATE TRIGGER trigger_51ab7cef8934 BEFORE INSERT OR UPDATE ON ci_builds_runner_
 
 CREATE TRIGGER trigger_69523443cc10 BEFORE INSERT OR UPDATE ON events FOR EACH ROW EXECUTE FUNCTION trigger_69523443cc10();
 
+CREATE TRIGGER trigger_77f5e1d20482 BEFORE INSERT OR UPDATE ON deployments FOR EACH ROW EXECUTE FUNCTION trigger_77f5e1d20482();
+
 CREATE TRIGGER trigger_8485e97c00e3 BEFORE INSERT OR UPDATE ON ci_sources_pipelines FOR EACH ROW EXECUTE FUNCTION trigger_8485e97c00e3();
 
 CREATE TRIGGER trigger_8487d4de3e7b BEFORE INSERT OR UPDATE ON ci_builds_metadata FOR EACH ROW EXECUTE FUNCTION trigger_8487d4de3e7b();