%ALLOWED_TABLES = map {$_ => 1} qw(company financialDiary);

sub add_data {
    my ( $self, $table, $data ) = @_;
    die "bad table!" unless $ALLOWED_TABLES{$table};
    my $data = $self->_generic_insert( $data, $table );
    $self->{ _dbh }->commit if ! $self->{ _error };
    return $data;
}