func (journal *Journal) UpdateUser(username string) (*JournalModel, error) { transaction, err := journal.GetSqlDb().Begin() if err != nil { return nil, err } _, err = transaction.Exec("UPDATE users_tg_gpt SET username = $1", username) if err != nil { transaction.Rollback() } err = transaction.Commit() if err != nil { return nil, err } return journal.FindJournalByUserId(username) } func (journal *Journal) DeleteUser(username string) error { transaction, err := journal.GetSqlDb().Begin() if err != nil { return err } _, err = transaction.Exec("DELETE FROM users_tg_gpt WHERE username = $1", username) if err != nil { transaction.Rollback() } err = transaction.Commit() if err != nil { return err } return nil } */.