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This seems to do the job of the EAV tables. Besides being EAV, is there room for improvement? Maybe there is something obvious, but how about indexing certain columns?

from django.db import models


class Entity(models.Model):
    entity_id = models.AutoField(primary_key=True)
    entity = models.CharField(max_length=100)


class Attribute(models.Model):
    attribute_id = models.AutoField(primary_key=True)
    entity_id = models.ForeignKey(Entity)
    value = models.CharField(max_length=100)


class EntityTableAbstract(models.Model):
    class Meta:
        abstract = True

    entity_id = models.ForeignKey(Entity)
    attribute_id = models.ForeignKey(Attribute)


class EntityVarchar(EntityTableAbstract):
    value = models.TextField()


class EntityInteger(EntityTableAbstract):
    value = models.IntegerField()
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