old_contents: from django.db import models
  
  KEYTYPE_CHOICES = (
      ('RSA', 'ssh-rsa'),
      ('DSA', 'ssh-dsa'),
      ('ECC-256', 'ecdsa-sha2-nistp256'),
      ('ECC-384', 'ecdsa-sha2-nistp384'),
      ('ECC-521', 'ecdsa-sha2-nistp521'),
  )
  
  class Node(models.Model):
      name = models.CharField(unique=True, primary_key=True, max_length=256)
      hostname = models.CharField(blank=True, max_length=256)
      public_keys = models.ManyToManyField('OpensshKey')
  
      def __unicode__(self):
          return self.name
  
  class OpensshKey(models.Model):
      name = models.CharField(unique=True, max_length=256)
      keytype = models.CharField(max_length=6, choices=KEYTYPE_CHOICES)
      key = models.TextField()
      host = models.CharField(max_length=256, blank=True)
  
      def __unicode__(self):
          return self.name
  
new_contents: from django.db import models
  
  KEYTYPE_CHOICES = (
      ('RSA', 'ssh-rsa'),
      ('DSA', 'ssh-dsa'),
      ('ECC256', 'ecdsa-sha2-nistp256'),
      ('ECC384', 'ecdsa-sha2-nistp384'),
      ('ECC521', 'ecdsa-sha2-nistp521'),
  )
  
  class Node(models.Model):
      name = models.CharField(unique=True, primary_key=True, max_length=256)
      hostname = models.CharField(blank=True, max_length=256)
      public_keys = models.ManyToManyField('OpensshKey')
  
      def __unicode__(self):
          return self.name
  
  class OpensshKey(models.Model):
      name = models.CharField(unique=True, max_length=256)
      keytype = models.CharField(max_length=6, choices=KEYTYPE_CHOICES)
      key = models.TextField()
      host = models.CharField(max_length=256, blank=True)
  
      def __unicode__(self):
          return self.name
  
subject: use 6 characters for the db type