drop table if exists users;
drop table if exists shops;
drop table if exists shares;
create table users (
    id integer primary key autoincrement,
    user text not null,
    pass text not null
);
create table shops (
    id integer primary key autoincrement,
    shop text not null,
    owner integer not null
);
create table shares (
    shopid integer not null,
    userid integer not null
);