sqlx/examples/postgres/axum-social-with-tests/migrations/3_comment.sql

create table comment (
    comment_id uuid primary key default gen_random_uuid(),
    post_id uuid not null references post(post_id),
    user_id uuid not null references "user"(user_id),
    content text not null,
    created_at timestamptz not null default now()
);

create index on comment(post_id, created_at);