diff --git a/etc/db_schema.xml b/etc/db_schema.xml
index b2e2365..065435c 100644
--- a/etc/db_schema.xml
+++ b/etc/db_schema.xml
@@ -27,8 +27,9 @@
     <constraint xsi:type="primary" referenceId="PRIMARY">
       <column name="entity_id"/>
     </constraint>
-    <index referenceId="SWISSUP_EMAIL_HISTORY_CREATED_AT" indexType="btree">
+    <index referenceId="SWISSUP_EMAIL_HISTORY_CREATED_AT_ENTITY_ID" indexType="btree">
       <column name="created_at"/>
+      <column name="entity_id"/>
     </index>
   </table>
 </schema>