Add per POP email source interval, add per email source log

apps/sources/managers.py

@@ -1,8 +1,12 @@
+from __future__ import absolute_import
+
 from ast import literal_eval
 
 from django.db import models
 from django.contrib.contenttypes.models import ContentType
 
+from .conf.settings import POP3_EMAIL_LOG_SIZE
+
 
 class SourceTransformationManager(models.Manager):
     def get_for_object(self, obj):
@@ -24,3 +28,12 @@ class SourceTransformationManager(models.Manager):
                 warnings.append(e)
 
         return transformations, warnings
+
+
+class POP3EmailLogManager(models.Manager):
+    def save_status(self, pop3_email, status):
+        new_recent = self.model(pop3_email=pop3_email, status=status)
+        new_recent.save()
+        to_delete = self.model.objects.filter(pop3_email=pop3_email).order_by('-creation_datetime')[POP3_EMAIL_LOG_SIZE:]
+        for recent_to_delete in to_delete:
+            recent_to_delete.delete()