text: create table if not exists log (
    id serial not null primary key,
    guid uuid not null default uuid_generate_v4(),
    source text not null,
    input jsonb not null,
    output jsonb not null,
    created_at timestamptz not null default now(),
    updated_at timestamptz not null default now()
  );
  
  create trigger set_timestamp
    before update on log
    for each row
    execute procedure trigger_set_timestamp();
  