add model migration

Signed-off-by: tdruez <tdruez@aboutcode.org>

Author: tdruez

product_portfolio/migrations/0019_productaffectedbyvulnerability_detected_date.py

@@ -0,0 +1,20 @@
+# Generated by Django 6.0.6 on 2026-07-22 13:35
+
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('product_portfolio', '0018_productpolicyviolation'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='productaffectedbyvulnerability',
+            name='detected_date',
+            field=models.DateTimeField(auto_now_add=True, default=django.utils.timezone.now, help_text='Date and time when this vulnerability was first detected on this object. Used to measure how long a vulnerability has remained unaddressed. Defaults to the time the record was created.'),
+            preserve_default=False,
+        ),
+    ]