Possible to condense primary key/serial?

Question

I have a database where everything is linked with foreign keys, so the Postgres knows exactly how the database is layed out..

Well, Lets say I have Table1 and Table2.

Answer 1

Look into on update cascade and on delete cascade.

create table table_1 (
    id integer
        primary key,
    name char(30)
);
create table table_2 (
    id integer
        primary key,
    table_1_id integer
        references table_1
        on update cascade
        on delete cascade,
    detail char(30)
);