feat: add migration to attach notes to existing timeslots

program/migrations/0085_attach_notes.py

+# Generated by Django 4.2.11 on 2024-03-26 22:07
+
+from django.db import migrations
+
+
+def attach_notes(apps, _):
+    Note = apps.get_model("program", "Note")
+    Timeslot = apps.get_model("program", "TimeSlot")
+
+    for timeslot in Timeslot.objects.filter(note=None):
+        Note.objects.create(timeslot=timeslot)
+        timeslot.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("program", "0084_alter_note_title"),
+    ]
+
+    operations = [migrations.RunPython(code=attach_notes)]