diff -r 2cb8d11aa9ca -r 8ff8e2aee0f9 src/notes/migrations/0001_initial.py
--- a/src/notes/migrations/0001_initial.py	Tue Jul 18 17:59:28 2017 +0200
+++ b/src/notes/migrations/0001_initial.py	Wed Jul 19 15:57:13 2017 +0200
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Generated by Django 1.11.2 on 2017-07-07 09:59
+# Generated by Django 1.11.2 on 2017-07-19 13:26
 from __future__ import unicode_literals
 
 import colorful.fields
@@ -78,8 +78,8 @@
             name='Note',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('created', models.DateTimeField(auto_now_add=True, verbose_name='Model|created')),
-                ('updated', models.DateTimeField(auto_now=True, verbose_name='Model|updated')),
+                ('created', models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='Model|created')),
+                ('updated', models.DateTimeField(auto_now=True, db_index=True, verbose_name='Model|updated')),
                 ('ext_id', models.UUIDField(default=uuid.uuid4, unique=True, verbose_name='Model|ext_id')),
                 ('version', concurrency.fields.AutoIncVersionField(default=1, help_text='record revision number', verbose_name='Model|version')),
                 ('tc_start', models.DateTimeField(verbose_name='Note|tc_start')),
@@ -100,8 +100,8 @@
             name='Protocol',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('created', models.DateTimeField(auto_now_add=True, verbose_name='Model|created')),
-                ('updated', models.DateTimeField(auto_now=True, verbose_name='Model|updated')),
+                ('created', models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='Model|created')),
+                ('updated', models.DateTimeField(auto_now=True, db_index=True, verbose_name='Model|updated')),
                 ('ext_id', models.UUIDField(default=uuid.uuid4, unique=True, verbose_name='Model|ext_id')),
                 ('version', concurrency.fields.AutoIncVersionField(default=1, help_text='record revision number', verbose_name='Model|version')),
                 ('title', models.CharField(max_length=255, verbose_name='Protocol|title')),
@@ -116,8 +116,8 @@
             name='Session',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('created', models.DateTimeField(auto_now_add=True, verbose_name='Model|created')),
-                ('updated', models.DateTimeField(auto_now=True, verbose_name='Model|updated')),
+                ('created', models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='Model|created')),
+                ('updated', models.DateTimeField(auto_now=True, db_index=True, verbose_name='Model|updated')),
                 ('ext_id', models.UUIDField(default=uuid.uuid4, unique=True, verbose_name='Model|ext_id')),
                 ('version', concurrency.fields.AutoIncVersionField(default=1, help_text='record revision number', verbose_name='Model|version')),
                 ('date', models.DateTimeField(default=django.utils.timezone.now, verbose_name='Session|date')),