text: ALTER TABLE sht.invoice
    ADD COLUMN contract_id CHARACTER VARYING;
  ALTER TABLE sht.invoice
    ADD COLUMN created_at TIMESTAMP WITHOUT TIME ZONE;
  ALTER TABLE sht.invoice
    ADD COLUMN party_revision BIGINT;
  
  ALTER TABLE sht.payment
    ADD COLUMN contract_id CHARACTER VARYING;
  ALTER TABLE sht.payment
    ADD COLUMN party_revision BIGINT;
  