apart indexes filename and path

lang_menu = {1:_('Cyrillic'), 2:_('Latin'), 3:_('Digits'), 9:_('Other symbols'), 0:_('Show all')}

class Book(models.Model):

    filename = models.CharField(max_length=SIZE_BOOK_FILENAME)

    path = models.CharField(max_length=SIZE_BOOK_PATH)

    filename = models.CharField(max_length=SIZE_BOOK_FILENAME,db_index=True)

    path = models.CharField(max_length=SIZE_BOOK_PATH,db_index=True)

    filesize = models.IntegerField(null=False, default=0)

    format = models.CharField(max_length=SIZE_BOOK_FORMAT)

    catalog = models.ForeignKey('Catalog',db_index=True)

    genres = models.ManyToManyField('Genre', through='bgenre')

    series = models.ManyToManyField('Series', through='bseries')  

    class Meta:

        index_together = [

            ["filename", "path"],

        ]    

class Catalog(models.Model):

    parent = models.ForeignKey('self', null=True, db_index=True)

    cat_name = models.CharField(max_length=SIZE_CAT_CATNAME, db_index=True)