text: \set nbranches :scale
  \set ntellers 10 * :scale
  \set naccounts 100000 * :scale
  \setrandom aid 1 :naccounts
  \setrandom bid 1 :nbranches
  \setrandom tid 1 :ntellers
  \setrandom delta -5000 5000
  BEGIN;
  UPDATE pgbench_accounts SET abalance = abalance + :delta WHERE aid = :aid;
  SELECT abalance FROM pgbench_accounts WHERE aid = :aid;
  INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP);
  END;
  