Add remaining columns to Domain's SQL schema (#702)

db/src/main/resources/sql/flyway/V40__add_columns_to_domain.sql

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+-- Copyright 2020 The Nomulus Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+ALTER TABLE "Domain" ADD COLUMN billing_recurrence_id int8;
+ALTER TABLE "Domain" ADD COLUMN autorenew_poll_message_id int8;
+ALTER TABLE "Domain" ADD COLUMN deletion_poll_message_id int8;
+
+ALTER TABLE IF EXISTS "Domain"
+   ADD CONSTRAINT fk_domain_billing_recurrence_id
+   FOREIGN KEY (billing_recurrence_id)
+   REFERENCES "BillingEvent";
+
+ALTER TABLE IF EXISTS "Domain"
+   ADD CONSTRAINT fk_domain_autorenew_poll_message_id
+   FOREIGN KEY (autorenew_poll_message_id)
+   REFERENCES "PollMessage";
+
+ALTER TABLE IF EXISTS "Domain"
+   ADD CONSTRAINT fk_domain_deletion_poll_message_id
+   FOREIGN KEY (deletion_poll_message_id)
+   REFERENCES "PollMessage";