--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/db/libervia_pubsub_update_2_3.sql	Fri Oct 15 13:40:59 2021 +0200
@@ -0,0 +1,25 @@
+-- we check version of the database before doing anything
+-- and stop execution if not good
+\set ON_ERROR_STOP
+DO $$
+DECLARE ver text;
+BEGIN
+    SELECT value INTO ver FROM metadata WHERE key='version';
+    IF NOT FOUND OR ver!='2' THEN
+        RAISE EXCEPTION 'This update file needs to be applied on database schema version 2, you use version %',ver;
+    END IF;
+END$$;
+\unset ON_ERROR_STOP
+-- end of version check
+
+/* we add "presence" access model */
+ALTER TABLE nodes DROP CONSTRAINT nodes_access_model_check;
+ALTER TABLE nodes ADD CHECK (access_model IN ('open', 'presence', 'publisher-roster', 'whitelist', 'publish-only', 'self-publisher'));
+
+/* and schema column */
+ALTER TABLE nodes ADD COLUMN schema xml;
+
+/* we want xml types for items data too */
+ALTER TABLE items ALTER data TYPE xml using data::xml;
+
+UPDATE metadata SET value='3' WHERE key='version';