Add persistent error logging to the mailer app.

mayan/apps/mailer/models.py

@@ -0,0 +1,27 @@
+from __future__ import unicode_literals
+
+import logging
+
+from django.db import models
+from django.utils.encoding import python_2_unicode_compatible
+from django.utils.translation import ugettext_lazy as _
+
+from djcelery.models import PeriodicTask, IntervalSchedule
+from documents.models import Document
+
+logger = logging.getLogger(__name__)
+
+
+class LogEntry(models.Model):
+    datetime = models.DateTimeField(
+        auto_now_add=True, editable=False, verbose_name=_('Date time')
+    )
+    message = models.TextField(
+        blank=True, editable=False, verbose_name=_('Message')
+    )
+
+    class Meta:
+        get_latest_by = 'datetime'
+        ordering = ('-datetime',)
+        verbose_name = _('Log entry')
+        verbose_name_plural = _('Log entries')