Move django-based uncloud to top-level

uncloud_auth/models.py

@@ -0,0 +1,23 @@
+from django.contrib.auth.models import AbstractUser
+from django.db import models
+from django.core.validators import MinValueValidator
+
+from uncloud import AMOUNT_DECIMALS, AMOUNT_MAX_DIGITS
+
+from uncloud_pay.models import get_balance_for_user
+
+class User(AbstractUser):
+    """
+    We use the standard user and add a maximum credit that is allowed
+    to be accumulated. After that we need to have warnings, cancellation, etc.
+    """
+
+    maximum_credit = models.DecimalField(
+            default=0.0,
+            max_digits=AMOUNT_MAX_DIGITS,
+            decimal_places=AMOUNT_DECIMALS,
+            validators=[MinValueValidator(0)])
+
+    @property
+    def balance(self):
+        return get_balance_for_user(self)