create table pool_updates (
  epoch_number integer not null,
  block_number bigint not null,
  tx_hash text not null,
  pool_ticker_name text,
  pool_bech32_id text not null,
  certificate_index integer not null,
  vrf_key_hash text not null,
  pledge bigint not null,
  reward_address text not null,
  active_epoch_number bigint not null,
  margin numeric not null,
  fixed_cost bigint not null
);