--- a/server/python/django2/renkanmanager/migrations/0007_foreign_key_final.py	Mon Jun 20 14:44:40 2016 +0200
+++ b/server/python/django2/renkanmanager/migrations/0007_foreign_key_final.py	Mon Jun 20 17:50:47 2016 +0200
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2016-06-17 09:50
+# Generated by Django 1.9.4 on 2016-06-20 15:49
 from __future__ import unicode_literals
 
 from django.db import migrations, models
@@ -36,6 +36,11 @@
         ),
         migrations.AlterField(
             model_name='revision',
+            name='modification_date',
+            field=models.DateTimeField(),
+        ),
+        migrations.AlterField(
+            model_name='revision',
             name='parent_renkan',
             field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='revisions', to='renkanmanager.Renkan'),
         ),

--- a/server/python/django2/renkanmanager/models.py	Mon Jun 20 14:44:40 2016 +0200
+++ b/server/python/django2/renkanmanager/models.py	Mon Jun 20 17:50:47 2016 +0200
@@ -59,10 +59,8 @@
         initial_revision.modification_date = creation_date
         initial_revision.creator = creator
         initial_revision.last_updated_by = creator
-        logger.debug("CREATE RENKAN NEW CONTENT %r", new_renkan_content)
         if new_renkan_content:
             new_renkan_content_dict = json.loads(new_renkan.validate_json_content(new_renkan_content))
-            logger.debug("CREATE RENKAN NEW CONTENT AFTER VALIDATE %r", new_renkan_content_dict)
             new_renkan_content_dict["created"] = str(creation_date)
             new_renkan_content_dict["updated"] = str(creation_date)
         else:
@@ -140,7 +138,6 @@
             raise ValidationError(_("Cannot save, provided timestamp is invalid"))
         else:
             dt_timestamp = dateparse.parse_datetime(timestamp)
-        logger.debug("SAVE RENKAN create new revision %r", create_new_revision)
 
         if create_new_revision:
             revision_to_update = Revision(parent_renkan=self)