Remove all foreign key constraints pointing to contact tables

This affects FKs pointing to both Contact and ContactHistory. This is in
preparation to us deleting all rows in those two tables, and then subsequently
removing all application logic having to do with contacts entirely.

Author: CydeWeys

db/src/main/resources/sql/er_diagram/brief_er_diagram.html

@@ -212,3 +212,6 @@ V211__domainhistoryhost_history_revision_id_hash.sql
 V212__domaindsdatahistory_history_revision_id_hash.sql
 V213__graceperiodhistory_history_revision_id_hash.sql
 V214__domain_unique_domain_name_active.sql
+V215__drop_contact_fks_contacthistory.sql
+V216__drop_contact_fks_domain.sql
+V217__drop_contact_fks_pollmessage.sql

db/src/main/resources/sql/er_diagram/full_er_diagram.html

@@ -0,0 +1,16 @@
+-- Copyright 2025 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 ONLY "ContactHistory"
+  DROP CONSTRAINT fk_contact_history_contact_repo_id;

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

@@ -0,0 +1,19 @@
+-- Copyright 2025 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 ONLY "Domain"
+  DROP CONSTRAINT fk_domain_admin_contact,
+  DROP CONSTRAINT fk_domain_billing_contact,
+  DROP CONSTRAINT fk_domain_registrant_contact,
+  DROP CONSTRAINT fk_domain_tech_contact;

db/src/main/resources/sql/flyway/V215__drop_contact_fks_contacthistory.sql

@@ -0,0 +1,17 @@
+-- Copyright 2025 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 ONLY "PollMessage"
+  DROP CONSTRAINT fk_poll_message_contact_history,
+  DROP CONSTRAINT fk_poll_message_contact_repo_id;

db/src/main/resources/sql/flyway/V216__drop_contact_fks_domain.sql

@@ -2940,14 +2940,6 @@ ALTER TABLE ONLY public."ConsoleUpdateHistory"
     ADD CONSTRAINT fk_console_update_history_acting_user FOREIGN KEY (acting_user) REFERENCES public."User"(email_address);
 
 
---
--- Name: ContactHistory fk_contact_history_contact_repo_id; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."ContactHistory"
-    ADD CONSTRAINT fk_contact_history_contact_repo_id FOREIGN KEY (contact_repo_id) REFERENCES public."Contact"(repo_id) DEFERRABLE INITIALLY DEFERRED;
-
-
 --
 -- Name: ContactHistory fk_contact_history_registrar_id; Type: FK CONSTRAINT; Schema: public; Owner: -
 --
@@ -2972,22 +2964,6 @@ ALTER TABLE ONLY public."Contact"
     ADD CONSTRAINT fk_contact_transfer_losing_registrar_id FOREIGN KEY (transfer_losing_registrar_id) REFERENCES public."Registrar"(registrar_id) DEFERRABLE INITIALLY DEFERRED;
 
 
---
--- Name: Domain fk_domain_admin_contact; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."Domain"
-    ADD CONSTRAINT fk_domain_admin_contact FOREIGN KEY (admin_contact) REFERENCES public."Contact"(repo_id) DEFERRABLE INITIALLY DEFERRED;
-
-
---
--- Name: Domain fk_domain_billing_contact; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."Domain"
-    ADD CONSTRAINT fk_domain_billing_contact FOREIGN KEY (billing_contact) REFERENCES public."Contact"(repo_id) DEFERRABLE INITIALLY DEFERRED;
-
-
 --
 -- Name: Domain fk_domain_billing_recurrence_id; Type: FK CONSTRAINT; Schema: public; Owner: -
 --
@@ -3028,22 +3004,6 @@ ALTER TABLE ONLY public."DomainHistory"
     ADD CONSTRAINT fk_domain_history_registrar_id FOREIGN KEY (history_registrar_id) REFERENCES public."Registrar"(registrar_id) DEFERRABLE INITIALLY DEFERRED;
 
 
---
--- Name: Domain fk_domain_registrant_contact; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."Domain"
-    ADD CONSTRAINT fk_domain_registrant_contact FOREIGN KEY (registrant_contact) REFERENCES public."Contact"(repo_id) DEFERRABLE INITIALLY DEFERRED;
-
-
---
--- Name: Domain fk_domain_tech_contact; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."Domain"
-    ADD CONSTRAINT fk_domain_tech_contact FOREIGN KEY (tech_contact) REFERENCES public."Contact"(repo_id) DEFERRABLE INITIALLY DEFERRED;
-
-
 --
 -- Name: Domain fk_domain_tld; Type: FK CONSTRAINT; Schema: public; Owner: -
 --
@@ -3188,22 +3148,6 @@ ALTER TABLE ONLY public."HostHistory"
     ADD CONSTRAINT fk_hosthistory_host FOREIGN KEY (host_repo_id) REFERENCES public."Host"(repo_id) DEFERRABLE INITIALLY DEFERRED;
 
 
---
--- Name: PollMessage fk_poll_message_contact_history; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."PollMessage"
-    ADD CONSTRAINT fk_poll_message_contact_history FOREIGN KEY (contact_repo_id, contact_history_revision_id) REFERENCES public."ContactHistory"(contact_repo_id, history_revision_id) DEFERRABLE INITIALLY DEFERRED;
-
-
---
--- Name: PollMessage fk_poll_message_contact_repo_id; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."PollMessage"
-    ADD CONSTRAINT fk_poll_message_contact_repo_id FOREIGN KEY (contact_repo_id) REFERENCES public."Contact"(repo_id) DEFERRABLE INITIALLY DEFERRED;
-
-
 --
 -- Name: PollMessage fk_poll_message_domain_repo_id; Type: FK CONSTRAINT; Schema: public; Owner: -
 --