make the 'last_activity' field in /tickets show the actual last activity by making it a virtual field

core/files/migrations/0002_alter_file_file.py

@@ -0,0 +1,19 @@
+# Generated by Django 4.2.7 on 2024-01-10 19:04
+
+from django.db import migrations, models
+import files.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('files', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='file',
+            name='file',
+            field=models.FileField(upload_to=files.models.hash_upload),
+        ),
+    ]