Support OPTIONAL slot numbers for lesson events (only for displaying purposes)

aleksis/apps/chronos/migrations/0017_optional_slot_number.py

+# Generated by Django 5.0.7 on 2024-07-26 19:36
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('chronos', '0016_lessonevent'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='lessonevent',
+            name='slot_number_end',
+            field=models.PositiveSmallIntegerField(blank=True, null=True, verbose_name='End slot number'),
+        ),
+        migrations.AddField(
+            model_name='lessonevent',
+            name='slot_number_start',
+            field=models.PositiveSmallIntegerField(blank=True, null=True, verbose_name='Start slot number'),
+        ),
+    ]