diff --git a/core/src/main/java/google/registry/model/contact/ContactResource.java b/core/src/main/java/google/registry/model/contact/ContactResource.java
index ec33fe886..6cc66b8f8 100644
--- a/core/src/main/java/google/registry/model/contact/ContactResource.java
+++ b/core/src/main/java/google/registry/model/contact/ContactResource.java
@@ -40,7 +40,7 @@ import org.joda.time.DateTime;
       @javax.persistence.Index(columnList = "creationTime"),
       @javax.persistence.Index(columnList = "currentSponsorRegistrarId"),
       @javax.persistence.Index(columnList = "deletionTime"),
-      @javax.persistence.Index(columnList = "contactId", unique = true),
+      @javax.persistence.Index(columnList = "contactId"),
       @javax.persistence.Index(columnList = "searchName")
     })
 @ExternalMessagingName("contact")
diff --git a/db/src/main/resources/sql/flyway/V46__Contact_contactId_index_to_non_unique.sql b/db/src/main/resources/sql/flyway/V46__Contact_contactId_index_to_non_unique.sql
new file mode 100644
index 000000000..f33dffc0e
--- /dev/null
+++ b/db/src/main/resources/sql/flyway/V46__Contact_contactId_index_to_non_unique.sql
@@ -0,0 +1,18 @@
+-- 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.
+
+create index IDXoqd7n4hbx86hvlgkilq75olas on "Contact" (contact_id);
+
+alter table if exists "Contact"
+    drop constraint if exists ukoqd7n4hbx86hvlgkilq75olas cascade;
diff --git a/db/src/main/resources/sql/schema/db-schema.sql.generated b/db/src/main/resources/sql/schema/db-schema.sql.generated
index 3a849b02e..4c6ff4c6a 100644
--- a/db/src/main/resources/sql/schema/db-schema.sql.generated
+++ b/db/src/main/resources/sql/schema/db-schema.sql.generated
@@ -580,10 +580,8 @@ create index IDXjny8wuot75b5e6p38r47wdawu on "BillingRecurrence" (recurrence_tim
 create index IDX3y752kr9uh4kh6uig54vemx0l on "Contact" (creation_time);
 create index IDXtm415d6fe1rr35stm33s5mg18 on "Contact" (current_sponsor_registrar_id);
 create index IDXn1f711wicdnooa2mqb7g1m55o on "Contact" (deletion_time);
+create index IDXoqd7n4hbx86hvlgkilq75olas on "Contact" (contact_id);
 create index IDX1p3esngcwwu6hstyua6itn6ff on "Contact" (search_name);
-
-    alter table if exists "Contact" 
-       add constraint UKoqd7n4hbx86hvlgkilq75olas unique (contact_id);
 create index IDXo1xdtpij2yryh0skxe9v91sep on "ContactHistory" (creation_time);
 create index IDXhp33wybmb6tbpr1bq7ttwk8je on "ContactHistory" (history_registrar_id);
 create index IDX9q53px6r302ftgisqifmc6put on "ContactHistory" (history_type);
diff --git a/db/src/main/resources/sql/schema/nomulus.golden.sql b/db/src/main/resources/sql/schema/nomulus.golden.sql
index bb46d4ac2..bae8e5ff2 100644
--- a/db/src/main/resources/sql/schema/nomulus.golden.sql
+++ b/db/src/main/resources/sql/schema/nomulus.golden.sql
@@ -1183,14 +1183,6 @@ ALTER TABLE ONLY public."RegistryLock"
     ADD CONSTRAINT idx_registry_lock_repo_id_revision_id UNIQUE (repo_id, revision_id);
 
 
---
--- Name: Contact ukoqd7n4hbx86hvlgkilq75olas; Type: CONSTRAINT; Schema: public; Owner: -
---
-
-ALTER TABLE ONLY public."Contact"
-    ADD CONSTRAINT ukoqd7n4hbx86hvlgkilq75olas UNIQUE (contact_id);
-
-
 --
 -- Name: idx1iy7njgb7wjmj9piml4l2g0qi; Type: INDEX; Schema: public; Owner: -
 --
@@ -1415,6 +1407,13 @@ CREATE INDEX idxn898pb9mwcg359cdwvolb11ck ON public."BillingRecurrence" USING bt
 CREATE INDEX idxo1xdtpij2yryh0skxe9v91sep ON public."ContactHistory" USING btree (creation_time);
 
 
+--
+-- Name: idxoqd7n4hbx86hvlgkilq75olas; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX idxoqd7n4hbx86hvlgkilq75olas ON public."Contact" USING btree (contact_id);
+
+
 --
 -- Name: idxp3usbtvk0v1m14i5tdp4xnxgc; Type: INDEX; Schema: public; Owner: -
 --