ipld-eth-server/db/migrations/1516050071_add_log_fk_constraint.up.sql

BEGIN;
ALTER TABLE logs
    DROP CONSTRAINT log_uc;

ALTER TABLE logs
  ADD COLUMN receipt_id INT;

ALTER TABLE logs
  ADD CONSTRAINT receipts_fk
FOREIGN KEY (receipt_id)
REFERENCES receipts (id)
ON DELETE CASCADE;

COMMIT;