diff --git a/biscuit/apps/chronos/migrations/0001_initial.py b/biscuit/apps/chronos/migrations/0001_initial.py
index 7f9dd8dce2f7e6b31b26b9d3eddc2d62fbd4a599..3ff7e1713d10955e78117c9b2ada5c2d9e1a9a59 100644
--- a/biscuit/apps/chronos/migrations/0001_initial.py
+++ b/biscuit/apps/chronos/migrations/0001_initial.py
@@ -1,4 +1,4 @@
-# Generated by Django 2.2.3 on 2019-07-16 11:42
+# Generated by Django 2.2.3 on 2019-07-16 22:12
 
 import django.core.validators
 from django.db import migrations, models
@@ -10,69 +10,62 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('core', '0004_group'),
+        ('core', '0005_person_short_name'),
+        ('cambro', '0001_initial'),
     ]
 
     operations = [
+        migrations.CreateModel(
+            name='Lesson',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('date_start', models.DateField(null=True, verbose_name='Effective start date of lesson')),
+                ('date_end', models.DateField(null=True, verbose_name='Effective end date of lesson')),
+                ('groups', models.ManyToManyField(related_name='lessons', to='core.Group')),
+            ],
+        ),
         migrations.CreateModel(
             name='Subject',
             fields=[
-                ('id', models.AutoField(auto_created=True,
-                                        primary_key=True, serialize=False, verbose_name='ID')),
-                ('abbrev', models.CharField(max_length=10,
-                                            verbose_name='Abbreviation of subject in timetable')),
-                ('name', models.CharField(max_length=30,
-                                          verbose_name='Long name of subject')),
-                ('colour_fg', models.CharField(blank=True, max_length=7, validators=[
-                 django.core.validators.RegexValidator('#[0-9A-F]{6}')], verbose_name='Foreground colour in timetable')),
-                ('colour_bg', models.CharField(blank=True, max_length=7, validators=[
-                 django.core.validators.RegexValidator('#[0-9A-F]{6}')], verbose_name='Background colour in timetable')),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('abbrev', models.CharField(max_length=10, verbose_name='Abbreviation of subject in timetable')),
+                ('name', models.CharField(max_length=30, verbose_name='Long name of subject')),
+                ('colour_fg', models.CharField(blank=True, max_length=7, validators=[django.core.validators.RegexValidator('#[0-9A-F]{6}')], verbose_name='Foreground colour in timetable')),
+                ('colour_bg', models.CharField(blank=True, max_length=7, validators=[django.core.validators.RegexValidator('#[0-9A-F]{6}')], verbose_name='Background colour in timetable')),
             ],
         ),
         migrations.CreateModel(
             name='TimePeriod',
             fields=[
-                ('id', models.AutoField(auto_created=True,
-                                        primary_key=True, serialize=False, verbose_name='ID')),
-                ('weekday', models.PositiveSmallIntegerField(choices=[(0, 'Sunday'), (1, 'Monday'), (2, 'Tuesday'), (
-                    3, 'Wednesday'), (4, 'Thursday'), (5, 'Friday'), (6, 'Saturday')], verbose_name='Week day')),
-                ('period', models.PositiveSmallIntegerField(
-                    verbose_name='Number of period')),
-                ('time_start', models.TimeField(
-                    verbose_name='Time the period starts')),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('weekday', models.PositiveSmallIntegerField(choices=[(0, 'Sunday'), (1, 'Monday'), (2, 'Tuesday'), (3, 'Wednesday'), (4, 'Thursday'), (5, 'Friday'), (6, 'Saturday')], verbose_name='Week day')),
+                ('period', models.PositiveSmallIntegerField(verbose_name='Number of period')),
+                ('time_start', models.TimeField(verbose_name='Time the period starts')),
                 ('time_end', models.TimeField(verbose_name='Time the period ends')),
             ],
         ),
         migrations.CreateModel(
             name='LessonPeriod',
             fields=[
-                ('id', models.AutoField(auto_created=True,
-                                        primary_key=True, serialize=False, verbose_name='ID')),
-                ('lesson', models.ForeignKey(
-                    on_delete=django.db.models.deletion.CASCADE, to='chronos.Lesson')),
-                ('period', models.ForeignKey(
-                    on_delete=django.db.models.deletion.CASCADE, to='chronos.TimePeriod')),
-                ('room', models.ForeignKey(
-                    on_delete=django.db.models.deletion.CASCADE, to='cambro.Room', null=True)),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('lesson', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='chronos.Lesson')),
+                ('period', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='chronos.TimePeriod')),
+                ('room', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='cambro.Room')),
             ],
         ),
-        migrations.CreateModel(
-            name='Lesson',
-            fields=[
-                ('id', models.AutoField(auto_created=True,
-                                        primary_key=True, serialize=False, verbose_name='ID')),
-                ('date_start', models.DateField(null=True,
-                                                verbose_name='Effective start date of lesson')),
-                ('date_end', models.DateField(null=True,
-                                              verbose_name='Effective end date of lesson')),
-                ('groups', models.ManyToManyField(
-                    related_name='lessons', to='core.Group')),
-                ('periods', models.ManyToManyField(related_name='lessons',
-                                                   through='chronos.LessonPeriod', to='chronos.TimePeriod')),
-                ('subject', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE,
-                                              related_name='lessons', to='chronos.Subject')),
-                ('teachers', models.ManyToManyField(
-                    related_name='lessons', to='core.Person')),
-            ],
+        migrations.AddField(
+            model_name='lesson',
+            name='periods',
+            field=models.ManyToManyField(related_name='lessons', through='chronos.LessonPeriod', to='chronos.TimePeriod'),
+        ),
+        migrations.AddField(
+            model_name='lesson',
+            name='subject',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='lessons', to='chronos.Subject'),
+        ),
+        migrations.AddField(
+            model_name='lesson',
+            name='teachers',
+            field=models.ManyToManyField(related_name='lessons', to='core.Person'),
         ),
     ]