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}

=head2 updated

Returns the Unix timestamp of the last database update (mtime for
file-based backends, or the time of the most recent C<new()> call for
DSN-based connections).

=cut

sub updated {
	my $self = shift;

	return $self->{'_updated'};
}

=head2 columns

Returns an array reference of column names for the current table.

    my $cols = $db->columns();    # e.g. ['entry', 'name', 'score', 'status']