CREATE TABLE IF NOT EXISTS ownership_change (
  id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  tx_id INT REFERENCES tx(id),
  previous_owner VARCHAR(42) NOT NULL DEFAULT '0x0000000000000000000000000000000000000000',
  new_owner VARCHAR(42) NOT NULL DEFAULT '0x0000000000000000000000000000000000000000'.
  contract_address VARCHAR(42) NOT NULL DEFAULT '0x0000000000000000000000000000000000000000'
);