fix(Item): id should be of type serial

winixd/models/item.cpp

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2010-2021, Tomasz Sowa
+ * Copyright (c) 2010-2022, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -208,6 +208,7 @@ bool Item::do_migration_to_1()
 {
 	const char * str = R"sql(
 		CREATE TABLE core.item (
+			id serial,
 			user_id integer,
 			group_id integer,
 			privileges integer,
@@ -215,7 +216,6 @@ bool Item::do_migration_to_1()
 			date_modification timestamp without time zone,
 			parent_id bigint,
 			type smallint,
-			id integer NOT NULL,
 			url character varying(255),
 			content_id bigint,
 			subject character varying(255),