     parent tinyint default 1,-- 0 or 1
     child tinyint default 0,
     tag_enable tinyint default 0 -- user suggested tag to be ebabled.
-);
+) engine=innodb;
 
 create table if not exists tag_alias (
     id int not null auto_increment primary key,

    alias_id2 int  not null,
    foreign key (alias_id1) references tag(id),
    foreign key (alias_id2) references tag(id)
);


create table if not exists tag_post_rel (

    target_id int,
    foreign key post_id references post(id),
    foreign key target_id references post(id),
) engine=innodb;

create table if not exists post_revision (
    id int not null auto_increment primary key,
