For recurring bills, you can copy the rows for older transactions, then insert the copied rows and change the dates and amounts. (vertex42.com)
Also, such an attack can't be used to steal bitcoins or change older transactions. (cryptonews.com)
Rather, it is several steps (such as auto - importing credit cards, importing a file of older transactions, and manually creating some invoices) that, taken together, may approximate a migration. (lawyerist.com)