create table if not exists projects (
  id uuid default gen_random_uuid() primary key,
  name text not null unique,
  description text,
  created_at timestamptz default now(),
  last_active_at timestamptz default now()
);

alter table thoughts add column if not exists project_id uuid references projects(id);
alter table thoughts add column if not exists archived_at timestamptz;

create index if not exists thoughts_project_id_idx on thoughts (project_id);
create index if not exists thoughts_archived_at_idx on thoughts (archived_at);