diff --git a/aleksis/apps/chronos/migrations/0005_auto_20200110_1637.py b/aleksis/apps/chronos/migrations/0005_auto_20200110_1637.py
new file mode 100644
index 0000000000000000000000000000000000000000..ff4239caccbce749d651069a70f3fa7c3281e78a
--- /dev/null
+++ b/aleksis/apps/chronos/migrations/0005_auto_20200110_1637.py
@@ -0,0 +1,74 @@
+# Generated by Django 3.0.2 on 2020-01-10 16:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0007_create_admin_user'),
+        ('chronos', '0004_room_name_not_unique'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='lesson',
+            name='school',
+        ),
+        migrations.RemoveField(
+            model_name='lessonperiod',
+            name='school',
+        ),
+        migrations.AlterField(
+            model_name='lesson',
+            name='teachers',
+            field=models.ManyToManyField(related_name='lessons_as_teacher', to='core.Person'),
+        ),
+        migrations.AlterField(
+            model_name='room',
+            name='short_name',
+            field=models.CharField(max_length=10, unique=True, verbose_name='Short name, e.g. room number'),
+        ),
+        migrations.AlterField(
+            model_name='subject',
+            name='abbrev',
+            field=models.CharField(max_length=10, unique=True, verbose_name='Abbreviation of subject in timetable'),
+        ),
+        migrations.AlterField(
+            model_name='subject',
+            name='name',
+            field=models.CharField(max_length=30, unique=True, verbose_name='Long name of subject'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='lessonsubstitution',
+            unique_together={('lesson_period', 'week')},
+        ),
+        migrations.AlterUniqueTogether(
+            name='room',
+            unique_together=set(),
+        ),
+        migrations.AlterUniqueTogether(
+            name='subject',
+            unique_together=set(),
+        ),
+        migrations.AlterUniqueTogether(
+            name='timeperiod',
+            unique_together={('weekday', 'period')},
+        ),
+        migrations.RemoveField(
+            model_name='lessonsubstitution',
+            name='school',
+        ),
+        migrations.RemoveField(
+            model_name='room',
+            name='school',
+        ),
+        migrations.RemoveField(
+            model_name='subject',
+            name='school',
+        ),
+        migrations.RemoveField(
+            model_name='timeperiod',
+            name='school',
+        ),
+    ]