Add missing foreign key constraints (#845)

* Add missing foreign key constraints

* Fix failed unit tests

db/src/main/resources/sql/flyway/V72__add_missing_foreign_keys.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 if exists "RegistrarPoc"
+   add constraint fk_registrar_poc_registrar_id
+   foreign key (registrar_id)
+   references "Registrar";
+
+alter table if exists "Spec11ThreatMatch"
+   add constraint fk_spec11_threat_match_domain_repo_id
+   foreign key (domain_repo_id)
+   references "Domain";
+
+alter table if exists "Spec11ThreatMatch"
+   add constraint fk_spec11_threat_match_registrar_id
+   foreign key (registrar_id)
+   references "Registrar";
+
+alter table if exists "Spec11ThreatMatch"
+   add constraint fk_spec11_threat_match_tld
+   foreign key (tld)
+   references "Tld";
+
+alter table if exists "BillingEvent"
+   add constraint fk_billing_event_domain_history
+   foreign key (domain_repo_id, domain_history_revision_id)
+   references "DomainHistory";
+
+alter table "BillingEvent" rename allocation_token_id to allocation_token;
+
+alter table if exists "BillingEvent"
+   add constraint fk_billing_event_allocation_token
+   foreign key (allocation_token)
+   references "AllocationToken";
+
+alter table if exists "BillingRecurrence"
+   add constraint fk_billing_recurrence_domain_history
+   foreign key (domain_repo_id, domain_history_revision_id)
+   references "DomainHistory";
+
+alter table if exists "BillingCancellation"
+   add constraint fk_billing_cancellation_domain_history
+   foreign key (domain_repo_id, domain_history_revision_id)
+   references "DomainHistory";
+
+alter table if exists "Contact"
+   add constraint fk_contact_transfer_gaining_poll_message_id
+   foreign key (transfer_gaining_poll_message_id)
+   references "PollMessage";
+
+alter table if exists "Contact"
+   add constraint fk_contact_transfer_losing_poll_message_id
+   foreign key (transfer_losing_poll_message_id)
+   references "PollMessage";
+
+alter table if exists "Domain"
+   add constraint fk_domain_tld
+   foreign key (tld)
+   references "Tld";
+
+alter table if exists "DomainTransactionRecord"
+   add constraint fk_domain_transaction_record_tld
+   foreign key (tld)
+   references "Tld";
+
+alter table if exists "GracePeriod"
+   add constraint fk_grace_period_registrar_id
+   foreign key (registrar_id)
+   references "Registrar";
+
+alter table if exists "Host"
+   add constraint fk_host_creation_registrar_id
+   foreign key (creation_registrar_id)
+   references "Registrar";
+
+alter table if exists "Host"
+   add constraint fk_host_current_sponsor_registrar_id
+   foreign key (current_sponsor_registrar_id)
+   references "Registrar";
+
+alter table if exists "Host"
+   add constraint fk_host_last_epp_update_registrar_id
+   foreign key (last_epp_update_registrar_id)
+   references "Registrar";