Add blob_name to Appointments

We want to avoid reading an incoming data file of
appointments twice - so we need to store some kind
of reference to the original file the Appointment
is from. We can then check whether an Appointment
already exists from the file before saving it
`create_appointments`

Author: Harriethw

manage_breast_screening/notifications/migrations/0013_add_blob_name_to_appointments.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.2.3 on 2025-08-21 14:36
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('notifications', '0012_alter_message_batch_notify_errors'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='appointment',
+            name='blob_name',
+            field=models.TextField(default='/'),
+            preserve_default=False,
+        ),
+    ]

manage_breast_screening/notifications/models.py

@@ -126,6 +126,7 @@ class Appointment(models.Model):
     starts_at = models.DateTimeField(null=False)
     created_at = models.DateTimeField(null=False, auto_now_add=True)
     updated_at = models.DateTimeField(null=True, auto_now=True)
+    blob_name = models.TextField(null=False)
 
     clinic = models.ForeignKey("notifications.Clinic", on_delete=models.PROTECT)