CREATE TABLE IF NOT EXISTS captchas (
  id                              UUID DEFAULT uuid_generate_v4(),
  token                           TEXT NOT NULL,
  security_code                   TEXT NOT NULL,
  expires_at                      BIGINT NOT NULL DEFAULT (extract(epoch from now()) * 1000),
  created_at                      BIGINT NOT NULL DEFAULT (extract(epoch from now()) * 1000),

  PRIMARY KEY (id)
);

-- index
CREATE UNIQUE INDEX uidx_captchas_token ON captchas (token);