CREATE TABLE IF NOT EXISTS api_kgon_synchronizations (
  id                SERIAL PRIMARY KEY,
  item              TEXT NOT NULL,
  last_code         BIGINT NOT NULL,
  synchronized_at   BIGINT NOT NULL DEFAULT (extract(epoch from now()) * 1000)
);

CREATE UNIQUE INDEX uidx_api_kgon_synchronizations_item ON api_kgon_synchronizations (item);