diff --git a/src/catalog/backends/pgconfig/src/main/resources/db/pgconfig/migration/postgresql/V1_8__ServiceInfoSettingsInfoConstraints.sql b/src/catalog/backends/pgconfig/src/main/resources/db/pgconfig/migration/postgresql/V1_8__ServiceInfoSettingsInfoConstraints.sql
index e5ce1b9c3..b2e2f6984 100644
--- a/src/catalog/backends/pgconfig/src/main/resources/db/pgconfig/migration/postgresql/V1_8__ServiceInfoSettingsInfoConstraints.sql
+++ b/src/catalog/backends/pgconfig/src/main/resources/db/pgconfig/migration/postgresql/V1_8__ServiceInfoSettingsInfoConstraints.sql
@@ -10,21 +10,21 @@
  * - serviceinfo("@type", workspace)
  */
 
-
-ALTER TABLE settingsinfo
-  ADD CONSTRAINT fk_settingsinfo_workspace
-  FOREIGN KEY (workspace)
-  REFERENCES workspaceinfo(id)
-  ON DELETE CASCADE;
-
-CREATE UNIQUE INDEX settingsinfo_workspace_key
-  ON settingsinfo (workspace)
-  NULLS NOT DISTINCT;
+/*
+ * Delete possible duplicate settingsinfo by workspace before enforcing uniqueness.
+ */
+DELETE FROM settingsinfo WHERE id IN( SELECT id FROM (
+  SELECT id,
+  ROW_NUMBER() OVER(PARTITION BY workspace ORDER BY id ASC) AS duprow
+  FROM settingsinfo
+) dups
+WHERE
+dups.duprow > 1);
 
 /*
  * Delete possible duplicate serviceinfos by type and workspace before enforcing uniqueness.
  */
-DELETE FROM serviceinfo WHERE id IN( select id FROM (
+DELETE FROM serviceinfo WHERE id IN( SELECT id FROM (
   SELECT id,
   ROW_NUMBER() OVER(PARTITION BY "@type", workspace ORDER BY id ASC) AS duprow
   FROM serviceinfo
@@ -32,6 +32,16 @@ DELETE FROM serviceinfo WHERE id IN( select id FROM (
 WHERE
 dups.duprow > 1);
 
+ALTER TABLE settingsinfo
+  ADD CONSTRAINT fk_settingsinfo_workspace
+  FOREIGN KEY (workspace)
+  REFERENCES workspaceinfo(id)
+  ON DELETE CASCADE;
+
+CREATE UNIQUE INDEX settingsinfo_workspace_key
+  ON settingsinfo (workspace)
+  NULLS NOT DISTINCT;
+
 ALTER TABLE serviceinfo
   ADD CONSTRAINT fk_serviceinfo_workspace
   FOREIGN KEY (workspace)