create table native_assets (
  transaction_id text not null,
  policy_id text not null,
  token_name text not null,
  metadata json not null,
  block_number bigint not null,
  epoch_slot_number bigint not null,
  epoch_number bigint not null,
  invalid_before bigint,
  invalid_hereafter bigint,
  quantity bigint not null
);