create table account (
    user_id serial primary key,
    username varchar(255) unique not null,
    password varchar(60) not null,
    is_admin bool not null default false,
    created_at timestamp with time zone default current_timestamp,
    updated_at timestamp with time zone default current_timestamp
);

create table website (
    website_id serial primary key,
    website_uuid uuid unique not null,
    user_id int not null references account(user_id) on delete cascade,
    name varchar(100) not null,
    domain varchar(500),
    created_at timestamp with time zone default current_timestamp
);

create table session (
    session_id serial primary key,
    session_uuid uuid unique not null,
    website_id int not null references website(website_id) on delete cascade,
    created_at timestamp with time zone default current_timestamp,
    hostname varchar(100),
    browser varchar(20),
    os varchar(20),
    device varchar(20),
    screen varchar(11),
    language varchar(35),
    country char(2)
);

create table pageview (
    view_id serial primary key,
    website_id int not null references website(website_id) on delete cascade,
    session_id int not null references session(session_id) on delete cascade,
    created_at timestamp with time zone default current_timestamp,
    url varchar(500) not null,
    referrer varchar(500)
);

create table event (
    event_id serial primary key,
    website_id int not null references website(website_id) on delete cascade,
    session_id int not null references session(session_id) on delete cascade,
    created_at timestamp with time zone default current_timestamp,
    url varchar(500) not null,
    event_type varchar(50) not null,
    event_value varchar(50) not null
);

create index on account(username);

create index on session(created_at);
create index on session(website_id);

create index on pageview(created_at);
create index on pageview(website_id);
create index on pageview(session_id);

create index on event(created_at);
create index on event(website_id);
create index on event(session_id);