add some new info to pos distributions list - has sale license-free sale

apps/core/models.py

@@ -56,10 +56,13 @@ class MobileTest(BaseModel):
 class SystemConfig(BaseModel):
     key = models.CharField(max_length=100, null=True)
     value = models.CharField(max_length=100, null=True)
+    quota = models.CharField(max_length=50, null=True)
 
     @classmethod
-    def get(cls, key, default=None):
+    def get(cls, key, quota_identity=None, default=None):
         try:
+            if quota_identity:
+                return cls.objects.get(key=key, quota=quota_identity).value
             return cls.objects.get(key=key).value
         except cls.DoesNotExist:
             return default