FEAT #1994 drop before add

core/trunk/sql/150.sql

@@ -241,6 +241,8 @@ ALTER TABLE listinstance DROP COLUMN IF EXISTS process_comment;
 ALTER TABLE listinstance ADD process_comment character varying(255);
 
 ALTER TABLE listmodels RENAME COLUMN description to title;
+
+ALTER TABLE listmodels DROP COLUMN IF EXISTS description;
 ALTER TABLE listmodels ADD COLUMN description varchar(255);
 
 DROP TABLE IF EXISTS listinstance_history;