Add extension upgrade files

repmgr--4.0-4.1.sql

@@ -0,0 +1,8 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION repmgr" to load this file. \quit
+
+ALTER TABLE repmgr.nodes
+  DROP CONSTRAINT nodes_type_check,
+  ADD CONSTRAINT nodes_type_check CHECK (type IN('primary','standby','witness','bdr','bdr_standby'));
+
+ type             TEXT        NOT NULL CHECK (type IN('primary','standby','witness','bdr','bdr_standby')),