update user model charfield max length more than 767 bug

apps/assets/models/user.py

@@ -35,13 +35,13 @@ class AdminUser(models.Model):
     username = models.CharField(max_length=16, verbose_name=_('Username'))
     _password = models.CharField(
         max_length=256, blank=True, null=True, verbose_name=_('Password'))
-    _private_key = models.CharField(max_length=4096, blank=True, null=True, verbose_name=_('SSH private key'),
+    _private_key = models.TextField(max_length=4096, blank=True, null=True, verbose_name=_('SSH private key'),
                                     validators=[private_key_validator,])
     become = models.BooleanField(default=True)
     become_method = models.CharField(choices=BECOME_METHOD_CHOICES, default='sudo', max_length=4)
     become_user = models.CharField(default='root', max_length=64)
     become_pass = models.CharField(default='', max_length=128)
-    _public_key = models.CharField(
+    _public_key = models.TextField(
         max_length=4096, blank=True, verbose_name=_('SSH public key'))
     comment = models.TextField(blank=True, verbose_name=_('Comment'))
     date_created = models.DateTimeField(auto_now_add=True, null=True)
@@ -138,9 +138,9 @@ class SystemUser(models.Model):
         max_length=256, blank=True, verbose_name=_('Password'))
     protocol = models.CharField(
         max_length=16, choices=PROTOCOL_CHOICES, default='ssh', verbose_name=_('Protocol'))
-    _private_key = models.CharField(
+    _private_key = models.TextField(
         max_length=8192, blank=True, verbose_name=_('SSH private key'))
-    _public_key = models.CharField(
+    _public_key = models.TextField(
         max_length=8192, blank=True, verbose_name=_('SSH public key'))
     auth_method = models.CharField(choices=AUTH_METHOD_CHOICES, default='K',
                                    max_length=1, verbose_name=_('Auth method'))