Use composite primary key for DomainHistory (#767)

* Use composite primary key for DomainHistory

* Move History table's SequenceGenerator to orm.xml

* Rebase on HEAD and remove default value for key in History tables

* Use primitive type for id.

* Revert the cache change

core/src/main/java/google/registry/model/contact/ContactHistory.java

@@ -19,8 +19,13 @@ import com.googlecode.objectify.annotation.EntitySubclass;
 import google.registry.model.EppResource;
 import google.registry.model.reporting.HistoryEntry;
 import google.registry.persistence.VKey;
+import javax.persistence.Access;
+import javax.persistence.AccessType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
 
 /**
  * A persisted history entry representing an EPP modification to a contact.
@@ -38,6 +43,7 @@ import javax.persistence.Entity;
       @javax.persistence.Index(columnList = "historyModificationTime")
     })
 @EntitySubclass
+@Access(AccessType.FIELD)
 public class ContactHistory extends HistoryEntry {
   // Store ContactBase instead of ContactResource so we don't pick up its @Id
   ContactBase contactBase;
@@ -45,6 +51,15 @@ public class ContactHistory extends HistoryEntry {
   @Column(nullable = false)
   VKey<ContactResource> contactRepoId;
 
+  @Id
+  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HistorySequenceGenerator")
+  @Column(name = "historyRevisionId")
+  @Access(AccessType.PROPERTY)
+  @Override
+  public long getId() {
+    return super.getId();
+  }
+
   /** The state of the {@link ContactBase} object at this point in time. */
   public ContactBase getContactBase() {
     return contactBase;

core/src/main/java/google/registry/model/domain/DomainHistory.java

@@ -14,20 +14,32 @@
 
 package google.registry.model.domain;
 
+import static google.registry.util.CollectionUtils.nullToEmptyImmutableCopy;
+
 import com.googlecode.objectify.Key;
 import com.googlecode.objectify.annotation.EntitySubclass;
+import com.googlecode.objectify.annotation.Ignore;
 import google.registry.model.EppResource;
-import google.registry.model.contact.ContactResource;
+import google.registry.model.ImmutableObject;
+import google.registry.model.domain.DomainHistory.DomainHistoryId;
 import google.registry.model.host.HostResource;
 import google.registry.model.reporting.HistoryEntry;
 import google.registry.persistence.VKey;
+import java.io.Serializable;
 import java.util.Set;
 import javax.persistence.Access;
 import javax.persistence.AccessType;
 import javax.persistence.Column;
 import javax.persistence.ElementCollection;
 import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.IdClass;
+import javax.persistence.Index;
 import javax.persistence.JoinTable;
+import javax.persistence.PostLoad;
+import javax.persistence.Table;
 
 /**
  * A persisted history entry representing an EPP modification to a domain.
@@ -37,27 +49,43 @@ import javax.persistence.JoinTable;
  * the foreign-keyed fields in that class can refer to this object.
  */
 @Entity
-@javax.persistence.Table(
+@Table(
     indexes = {
-      @javax.persistence.Index(columnList = "creationTime"),
+      @Index(columnList = "creationTime"),
-      @javax.persistence.Index(columnList = "historyRegistrarId"),
+      @Index(columnList = "historyRegistrarId"),
-      @javax.persistence.Index(columnList = "historyType"),
+      @Index(columnList = "historyType"),
-      @javax.persistence.Index(columnList = "historyModificationTime")
+      @Index(columnList = "historyModificationTime")
     })
 @EntitySubclass
+@Access(AccessType.FIELD)
+@IdClass(DomainHistoryId.class)
 public class DomainHistory extends HistoryEntry {
   // Store DomainContent instead of DomainBase so we don't pick up its @Id
   DomainContent domainContent;
 
-  @Column(nullable = false)
+  @Id String domainRepoId;
-  VKey<DomainBase> domainRepoId;
 
+  // We could have reused domainContent.nsHosts here, but Hibernate throws a weird exception after
+  // we change to use a composite primary key.
+  // TODO(b/166776754): Investigate if we can reuse domainContent.nsHosts for storing host keys.
+  @Ignore
   @ElementCollection
   @JoinTable(name = "DomainHistoryHost")
-  @Access(AccessType.PROPERTY)
   @Column(name = "host_repo_id")
+  Set<VKey<HostResource>> nsHosts;
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HistorySequenceGenerator")
+  @Column(name = "historyRevisionId")
+  @Access(AccessType.PROPERTY)
+  @Override
+  public long getId() {
+    return super.getId();
+  }
+
+  /** Returns keys to the {@link HostResource} that are the nameservers for the domain. */
   public Set<VKey<HostResource>> getNsHosts() {
-    return domainContent.nsHosts;
+    return nsHosts;
   }
 
   /** The state of the {@link DomainContent} object at this point in time. */
@@ -65,16 +93,51 @@ public class DomainHistory extends HistoryEntry {
     return domainContent;
   }
 
-  /** The key to the {@link ContactResource} this is based off of. */
+  /** The key to the {@link DomainBase} this is based off of. */
   public VKey<DomainBase> getDomainRepoId() {
-    return domainRepoId;
+    return VKey.create(DomainBase.class, domainRepoId, Key.create(DomainBase.class, domainRepoId));
   }
 
-  // Hibernate needs this in order to populate nsHosts but no one else should ever use it
+  public VKey<DomainHistory> createVKey() {
-  @SuppressWarnings("UnusedMethod")
+    return VKey.createSql(DomainHistory.class, new DomainHistoryId(domainRepoId, getId()));
-  private void setNsHosts(Set<VKey<HostResource>> nsHosts) {
+  }
+
+  @PostLoad
+  void postLoad() {
     if (domainContent != null) {
-      domainContent.nsHosts = nsHosts;
+      domainContent.nsHosts = nullToEmptyImmutableCopy(nsHosts);
+    }
+  }
+
+  /** Class to represent the composite primary key of {@link DomainHistory} entity. */
+  static class DomainHistoryId extends ImmutableObject implements Serializable {
+
+    private String domainRepoId;
+
+    private Long id;
+
+    /** Hibernate requires this default constructor. */
+    private DomainHistoryId() {}
+
+    DomainHistoryId(String domainRepoId, long id) {
+      this.domainRepoId = domainRepoId;
+      this.id = id;
+    }
+
+    String getDomainRepoId() {
+      return domainRepoId;
+    }
+
+    void setDomainRepoId(String domainRepoId) {
+      this.domainRepoId = domainRepoId;
+    }
+
+    long getId() {
+      return id;
+    }
+
+    void setId(long id) {
+      this.id = id;
     }
   }
 
@@ -93,12 +156,15 @@ public class DomainHistory extends HistoryEntry {
 
     public Builder setDomainContent(DomainContent domainContent) {
       getInstance().domainContent = domainContent;
+      if (domainContent != null) {
+        getInstance().nsHosts = nullToEmptyImmutableCopy(domainContent.nsHosts);
+      }
       return this;
     }
 
-    public Builder setDomainRepoId(VKey<DomainBase> domainRepoId) {
+    public Builder setDomainRepoId(String domainRepoId) {
       getInstance().domainRepoId = domainRepoId;
-      domainRepoId.maybeGetOfyKey().ifPresent(parent -> getInstance().parent = parent);
+      getInstance().parent = Key.create(DomainBase.class, domainRepoId);
       return this;
     }
 
@@ -106,8 +172,7 @@ public class DomainHistory extends HistoryEntry {
     @Override
     public Builder setParent(Key<? extends EppResource> parent) {
       super.setParent(parent);
-      getInstance().domainRepoId =
+      getInstance().domainRepoId = parent.getName();
-          VKey.create(DomainBase.class, parent.getName(), (Key<DomainBase>) parent);
       return this;
     }
   }

core/src/main/java/google/registry/model/host/HostHistory.java

@@ -19,8 +19,13 @@ import com.googlecode.objectify.annotation.EntitySubclass;
 import google.registry.model.EppResource;
 import google.registry.model.reporting.HistoryEntry;
 import google.registry.persistence.VKey;
+import javax.persistence.Access;
+import javax.persistence.AccessType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
 
 /**
  * A persisted history entry representing an EPP modification to a host.
@@ -39,6 +44,7 @@ import javax.persistence.Entity;
       @javax.persistence.Index(columnList = "historyModificationTime")
     })
 @EntitySubclass
+@Access(AccessType.FIELD)
 public class HostHistory extends HistoryEntry {
 
   // Store HostBase instead of HostResource so we don't pick up its @Id
@@ -47,6 +53,15 @@ public class HostHistory extends HistoryEntry {
   @Column(nullable = false)
   VKey<HostResource> hostRepoId;
 
+  @Id
+  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HistorySequenceGenerator")
+  @Column(name = "historyRevisionId")
+  @Access(AccessType.PROPERTY)
+  @Override
+  public long getId() {
+    return super.getId();
+  }
+
   /** The state of the {@link HostBase} object at this point in time. */
   public HostBase getHostBase() {
     return hostBase;

core/src/main/java/google/registry/model/reporting/HistoryEntry.java

@@ -42,15 +42,14 @@ import google.registry.persistence.VKey;
 import google.registry.persistence.WithStringVKey;
 import java.util.Set;
 import javax.annotation.Nullable;
+import javax.persistence.Access;
+import javax.persistence.AccessType;
 import javax.persistence.AttributeOverride;
 import javax.persistence.AttributeOverrides;
 import javax.persistence.Column;
 import javax.persistence.EnumType;
 import javax.persistence.Enumerated;
-import javax.persistence.GeneratedValue;
-import javax.persistence.GenerationType;
 import javax.persistence.MappedSuperclass;
-import javax.persistence.SequenceGenerator;
 import javax.persistence.Transient;
 import org.joda.time.DateTime;
 
@@ -59,6 +58,7 @@ import org.joda.time.DateTime;
 @Entity
 @MappedSuperclass
 @WithStringVKey // TODO(b/162229294): This should be resolved during the course of that bug
+@Access(AccessType.FIELD)
 public class HistoryEntry extends ImmutableObject implements Buildable {
 
   /** Represents the type of history entry. */
@@ -110,17 +110,13 @@ public class HistoryEntry extends ImmutableObject implements Buildable {
     SYNTHETIC
   }
 
-  /** The autogenerated id of this event. */
+  /**
-  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HistorySequenceGenerator")
+   * The autogenerated id of this event. Note that, this field is marked as {@link Transient} in the
-  @SequenceGenerator(
+   * SQL schema, this is because the child class of {@link HistoryEntry}, e.g. {@link
-      name = "HistorySequenceGenerator",
+   * DomainHistory}, uses a composite primary key which the id is part of, and Hibernate requires
-      sequenceName = "history_id_sequence",
+   * that all the {@link javax.persistence.Id} fields must be put in the exact same class.
-      allocationSize = 1)
+   */
-  @Id
+  @Id @Transient @VisibleForTesting public Long id;
-  @javax.persistence.Id
-  @Column(name = "historyRevisionId")
-  @VisibleForTesting
-  public Long id;
 
   /** The resource this event mutated. */
   @Parent @Transient protected Key<? extends EppResource> parent;
@@ -196,8 +192,17 @@ public class HistoryEntry extends ImmutableObject implements Buildable {
   @Transient // domain-specific
   Set<DomainTransactionRecord> domainTransactionRecords;
 
-  public Long getId() {
+  public long getId() {
-    return id;
+    // For some reason, Hibernate throws NPE during some initialization phase if we don't deal with
+    // the null case. Setting the id to 0L when it is null should be fine because 0L for primitive
+    // type is considered as null for wrapper class in the Hibernate context.
+    return id == null ? 0L : id;
+  }
+
+  // This method is required by Hibernate.
+  @SuppressWarnings("UnusedMethod")
+  private void setId(long id) {
+    this.id = id;
   }
 
   public Key<? extends EppResource> getParent() {
@@ -279,11 +284,7 @@ public class HistoryEntry extends ImmutableObject implements Buildable {
     // can't use a switch statement since we're calling getKind()
     if (parentKind.equals(getKind(DomainBase.class))) {
       resultEntity =
-          new DomainHistory.Builder()
+          new DomainHistory.Builder().copyFrom(this).setDomainRepoId(parent.getName()).build();
-              .copyFrom(this)
-              .setDomainRepoId(
-                  VKey.create(DomainBase.class, parent.getName(), (Key<DomainBase>) parent))
-              .build();
     } else if (parentKind.equals(getKind(HostResource.class))) {
       resultEntity =
           new HostHistory.Builder()
@@ -349,6 +350,7 @@ public class HistoryEntry extends ImmutableObject implements Buildable {
       return thisCastToDerived();
     }
 
+    // Until we move completely to SQL, override this in subclasses (e.g. HostHistory) to set VKeys
     public B setParent(Key<? extends EppResource> parent) {
       getInstance().parent = parent;
       return thisCastToDerived();

core/src/main/resources/META-INF/orm.xml

@@ -10,6 +10,9 @@
       <basic name="amount" access="FIELD"/>
     </attributes>
   </embeddable>
+
+  <sequence-generator name="HistorySequenceGenerator" sequence-name="history_id_sequence" />
+
   <persistence-unit-metadata>
     <persistence-unit-defaults>
       <entity-listeners>

core/src/test/java/google/registry/model/history/DomainHistoryTest.java

@@ -14,6 +14,7 @@
 
 package google.registry.model.history;
 
+import static com.google.common.collect.ImmutableSet.toImmutableSet;
 import static com.google.common.truth.Truth.assertThat;
 import static google.registry.model.ImmutableObjectSubject.assertAboutImmutableObjects;
 import static google.registry.persistence.transaction.TransactionManagerFactory.jpaTm;
@@ -71,11 +72,15 @@ public class DomainHistoryTest extends EntityTestCase {
     jpaTm()
         .transact(
             () -> {
-              DomainHistory fromDatabase =
+              DomainHistory fromDatabase = jpaTm().load(domainHistory.createVKey());
-                  jpaTm().load(VKey.createSql(DomainHistory.class, domainHistory.getId()));
               assertDomainHistoriesEqual(fromDatabase, domainHistory);
               assertThat(fromDatabase.getDomainRepoId().getSqlKey())
                   .isEqualTo(domainHistory.getDomainRepoId().getSqlKey());
+              assertThat(fromDatabase.getNsHosts())
+                  .containsExactlyElementsIn(
+                      domainHistory.getNsHosts().stream()
+                          .map(key -> VKey.createSql(HostResource.class, key.getSqlKey()))
+                          .collect(toImmutableSet()));
             });
   }
 
@@ -120,7 +125,7 @@ public class DomainHistoryTest extends EntityTestCase {
   static void assertDomainHistoriesEqual(DomainHistory one, DomainHistory two) {
     assertAboutImmutableObjects()
         .that(one)
-        .isEqualExceptFields(two, "domainContent", "domainRepoId", "parent");
+        .isEqualExceptFields(two, "domainContent", "domainRepoId", "parent", "nsHosts");
   }
 
   private DomainHistory createDomainHistory(DomainContent domain) {
@@ -134,7 +139,7 @@ public class DomainHistoryTest extends EntityTestCase {
         .setReason("reason")
         .setRequestedByRegistrar(true)
         .setDomainContent(domain)
-        .setDomainRepoId(domain.createVKey())
+        .setDomainRepoId(domain.getRepoId())
         .build();
   }
 }

core/src/test/resources/google/registry/model/schema.txt

@@ -270,9 +270,9 @@ class google.registry.model.domain.DomainHistory {
   google.registry.model.domain.Period period;
   google.registry.model.eppcommon.Trid trid;
   google.registry.model.reporting.HistoryEntry$Type type;
-  google.registry.persistence.VKey<google.registry.model.domain.DomainBase> domainRepoId;
   java.lang.Boolean requestedByRegistrar;
   java.lang.String clientId;
+  java.lang.String domainRepoId;
   java.lang.String otherClientId;
   java.lang.String reason;
   java.util.Set<google.registry.model.reporting.DomainTransactionRecord> domainTransactionRecords;

db/src/main/resources/sql/flyway/V51__use_composite_primary_key_for_domain_history_table.sql

@@ -0,0 +1,34 @@
+-- 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 sequence "history_id_sequence" increment 50;
+
+alter table "DomainHistory" alter column history_revision_id drop default;
+alter table "ContactHistory" alter column history_revision_id drop default;
+alter table "HostHistory" alter column history_revision_id drop default;
+
+alter table if exists "DomainHistoryHost"
+    drop constraint fk6b8eqdxwe3guc56tgpm89atx;
+
+alter table "DomainHistory" drop constraint "DomainHistory_pkey";
+
+alter table "DomainHistory"
+    add constraint "DomainHistory_pkey" primary key (domain_repo_id, history_revision_id);
+
+alter table "DomainHistoryHost" add column domain_history_domain_repo_id text not null;
+
+alter table if exists "DomainHistoryHost"
+    add constraint FKa9woh3hu8gx5x0vly6bai327n
+    foreign key (domain_history_domain_repo_id, domain_history_history_revision_id)
+    references "DomainHistory";

db/src/main/resources/sql/schema/db-schema.sql.generated

@@ -11,7 +11,7 @@
 -- 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.
-create sequence history_id_sequence start 1 increment 1;
+create sequence history_id_sequence start 1 increment 50;
 
     create table "AllocationToken" (
        token text not null,
@@ -286,7 +286,8 @@ create sequence history_id_sequence start 1 increment 1;
     );
 
     create table "DomainHistory" (
-       history_revision_id int8 not null,
+       domain_repo_id text not null,
+        history_revision_id int8 not null,
         history_by_superuser boolean not null,
         history_registrar_id text,
         history_modification_time timestamptz not null,
@@ -341,12 +342,12 @@ create sequence history_id_sequence start 1 increment 1;
         last_epp_update_time timestamptz,
         statuses text[],
         update_timestamp timestamptz,
-        domain_repo_id text not null,
+        primary key (domain_repo_id, history_revision_id)
-        primary key (history_revision_id)
     );
 
     create table "DomainHistoryHost" (
-       domain_history_history_revision_id int8 not null,
+       domain_history_domain_repo_id text not null,
+        domain_history_history_revision_id int8 not null,
         host_repo_id text
     );
 
@@ -644,8 +645,8 @@ create index spec11threatmatch_check_date_idx on "Spec11ThreatMatch" (check_date
        references "ClaimsList";
 
     alter table if exists "DomainHistoryHost" 
-       add constraint FK378h8v3j8qd8xtjn2e0bcmrtj 
+       add constraint FKa9woh3hu8gx5x0vly6bai327n 
-       foreign key (domain_history_history_revision_id) 
+       foreign key (domain_history_domain_repo_id, domain_history_history_revision_id) 
        references "DomainHistory";
 
     alter table if exists "DomainHost" 

db/src/main/resources/sql/schema/nomulus.golden.sql

@@ -275,24 +275,12 @@ CREATE TABLE public."Contact" (
 );
 
 
---
--- Name: history_id_sequence; Type: SEQUENCE; Schema: public; Owner: -
---
-
-CREATE SEQUENCE public.history_id_sequence
-    START WITH 1
-    INCREMENT BY 1
-    NO MINVALUE
-    NO MAXVALUE
-    CACHE 1;
-
-
 --
 -- Name: ContactHistory; Type: TABLE; Schema: public; Owner: -
 --
 
 CREATE TABLE public."ContactHistory" (
-    history_revision_id bigint DEFAULT nextval('public.history_id_sequence'::regclass) NOT NULL,
+    history_revision_id bigint NOT NULL,
     history_by_superuser boolean NOT NULL,
     history_registrar_id text,
     history_modification_time timestamp with time zone NOT NULL,
@@ -431,7 +419,7 @@ CREATE TABLE public."Domain" (
 --
 
 CREATE TABLE public."DomainHistory" (
-    history_revision_id bigint DEFAULT nextval('public.history_id_sequence'::regclass) NOT NULL,
+    history_revision_id bigint NOT NULL,
     history_by_superuser boolean NOT NULL,
     history_registrar_id text,
     history_modification_time timestamp with time zone NOT NULL,
@@ -496,7 +484,8 @@ CREATE TABLE public."DomainHistory" (
 
 CREATE TABLE public."DomainHistoryHost" (
     domain_history_history_revision_id bigint NOT NULL,
-    host_repo_id text
+    host_repo_id text,
+    domain_history_domain_repo_id text NOT NULL
 );
 
 
@@ -549,7 +538,7 @@ ALTER SEQUENCE public."GracePeriod_id_seq" OWNED BY public."GracePeriod".id;
 --
 
 CREATE TABLE public."HostHistory" (
-    history_revision_id bigint DEFAULT nextval('public.history_id_sequence'::regclass) NOT NULL,
+    history_revision_id bigint NOT NULL,
     history_by_superuser boolean NOT NULL,
     history_registrar_id text NOT NULL,
     history_modification_time timestamp with time zone NOT NULL,
@@ -929,6 +918,18 @@ CREATE SEQUENCE public."Transaction_id_seq"
 ALTER SEQUENCE public."Transaction_id_seq" OWNED BY public."Transaction".id;
 
 
+--
+-- Name: history_id_sequence; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE public.history_id_sequence
+    START WITH 1
+    INCREMENT BY 50
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
 --
 -- Name: BillingCancellation billing_cancellation_id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -1083,7 +1084,7 @@ ALTER TABLE ONLY public."Cursor"
 --
 
 ALTER TABLE ONLY public."DomainHistory"
-    ADD CONSTRAINT "DomainHistory_pkey" PRIMARY KEY (history_revision_id);
+    ADD CONSTRAINT "DomainHistory_pkey" PRIMARY KEY (domain_repo_id, history_revision_id);
 
 
 --
@@ -1612,14 +1613,6 @@ ALTER TABLE ONLY public."HostHistory"
     ADD CONSTRAINT fk3d09knnmxrt6iniwnp8j2ykga FOREIGN KEY (history_registrar_id) REFERENCES public."Registrar"(registrar_id);
 
 
---
--- Name: DomainHistoryHost fk6b8eqdxwe3guc56tgpm89atx; Type: FK CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."DomainHistoryHost"
-    ADD CONSTRAINT fk6b8eqdxwe3guc56tgpm89atx FOREIGN KEY (domain_history_history_revision_id) REFERENCES public."DomainHistory"(history_revision_id);
-
-
 --
 -- Name: ClaimsEntry fk6sc6at5hedffc0nhdcab6ivuq; Type: FK CONSTRAINT; Schema: public; Owner: -
 --
@@ -1916,6 +1909,14 @@ ALTER TABLE ONLY public."PollMessage"
     ADD CONSTRAINT fk_poll_message_transfer_response_losing_registrar_id FOREIGN KEY (transfer_response_losing_registrar_id) REFERENCES public."Registrar"(registrar_id);
 
 
+--
+-- Name: DomainHistoryHost fka9woh3hu8gx5x0vly6bai327n; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public."DomainHistoryHost"
+    ADD CONSTRAINT fka9woh3hu8gx5x0vly6bai327n FOREIGN KEY (domain_history_domain_repo_id, domain_history_history_revision_id) REFERENCES public."DomainHistory"(domain_repo_id, history_revision_id);
+
+
 --
 -- Name: DomainHost fkfmi7bdink53swivs390m2btxg; Type: FK CONSTRAINT; Schema: public; Owner: -
 --