https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20325

            Bug ID: 20325
           Summary: C4::Accounts::purge_zero_balance_fees does not check
                    account_offsets.
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: koha-bugs@lists.koha-community.org
          Reporter: bar...@bywatersolutions.com
        QA Contact: testo...@bugs.koha-community.org

purge_zero_balance_fees is used in cleanup_database.pl to determine which fees
can be cleaned up.

It uses a simple SQL query to determine which rows in accountlines need to be
removed:

463     my $sth = $dbh->prepare(
464         q{
465             DELETE FROM accountlines
466             WHERE date < date_sub(curdate(), INTERVAL ? DAY)
467               AND ( amountoutstanding = 0 or amountoutstanding IS NULL );
468         }

The function comes with the following warning:

451 B<Warning:> Because fines and payments are not linked in accountlines, it
is
452 possible for a fine to be deleted without the accompanying payment,
453 or vise versa. This won't affect the account balance, but might be
454 confusing to staff.

This was a reasonable solution prior to the addition of account_offsets in
17.11. The problem now is that rows in accountlines which are linked as credits
in accountlines will *always* have amountoutstanding marked as 0. These are
linked to debits via account_offsets. purge_zero_balance_fees will delete
credits and leave rows in account_offsets which link to deleted credits.

Sites using the --fees option cleanup_database.pl which upgrade to 17.11 may
have all of their credits removed without warning.

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