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properly.

=back

=head1 METHODS

=head2 Transaction Management

=over 4

=item txn_do $code, %callbacks

Executes C<$code> within a transaction in an C<eval> block.

If any error is thrown the transaction will be rolled back. Otherwise the
transaction is comitted.

C<%callbacks> can contain entries for C<commit> and C<rollback>, which are
called when the appropriate action is taken.

=item txn_begin

Begin a new transaction. Can be called even if there is already a running
transaction (nested transactions are supported).

=item txn_commit

Commit the current transaction. If it is a nested transaction, it will commit