updated statement for createCustomerTitleUniqueConstraintIfNotExists method

application/src/main/java/org/thingsboard/server/service/install/SqlEntityDatabaseSchemaService.java

@@ -55,8 +55,7 @@ public class SqlEntityDatabaseSchemaService extends SqlAbstractDatabaseSchemaSer
 
     @Override
     public void createCustomerTitleUniqueConstraintIfNotExists() {
-        executeQuery("DO $$ BEGIN IF NOT EXISTS(SELECT FROM information_schema.constraint_column_usage " +
+        executeQuery("DO $$ BEGIN IF NOT EXISTS(SELECT 1 FROM pg_constraint WHERE conname = 'customer_title_unq_key') THEN " +
-                "WHERE table_name = 'customer' AND constraint_name = 'customer_title_unq_key') THEN " +
+                "ALTER TABLE customer ADD CONSTRAINT customer_title_unq_key UNIQUE(tenant_id, title); END IF; END; $$;");
-                "ALTER TABLE customer ADD CONSTRAINT customer_title_unq_key UNIQUE (tenant_id, title); END IF; END $$;");
     }
 }