wip for db_migrations for core schema

sql/pgsql/migrations/51.sql

@@ -0,0 +1,18 @@
+begin;
+
+create table ttrss_labels2 (id serial not null primary key, 
+	owner_uid integer not null references ttrss_users(id) ON DELETE CASCADE,
+	caption varchar(250) not null
+);
+
+create table ttrss_user_labels2 (
+	label_id integer not null references ttrss_labels2(id) ON DELETE CASCADE,
+	article_id integer not null references ttrss_entries(id) ON DELETE CASCADE
+);
+
+insert into ttrss_filter_actions (id,name,description) values (7, 'label', 
+	'Assign label');
+
+update ttrss_version set schema_version = 51;
+
+commit;