feat(devops): Prevent deletion of software when it has feature flagging enabled and/or feature flags

ref: #670 closes #659

app/devops/migrations/0006_alter_featureflag_software_and_more.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.1.5 on 2025-03-07 07:03
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('devops', '0005_alter_featureflag_software'),
+        ('itam', '0010_alter_software_organization'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='featureflag',
+            name='software',
+            field=models.ForeignKey(help_text='Software this feature flag is for', limit_choices_to={'feature_flagging__enabled': True}, on_delete=django.db.models.deletion.PROTECT, related_name='feature_flags', to='itam.software', verbose_name='Software'),
+        ),
+        migrations.AlterField(
+            model_name='softwareenablefeatureflag',
+            name='software',
+            field=models.ForeignKey(help_text='Software this feature flag is for', on_delete=django.db.models.deletion.PROTECT, related_name='feature_flagging', to='itam.software', verbose_name='Software'),
+        ),
+    ]

app/devops/models/feature_flag.py

@@ -38,7 +38,7 @@ class FeatureFlag(
         limit_choices_to = {
             'feature_flagging__enabled': True
         },
-        on_delete = models.CASCADE,
+        on_delete = models.PROTECT,
         related_name = 'feature_flags',
         verbose_name = 'Software',
     )

app/devops/models/software_enable_feature_flag.py

@@ -47,7 +47,7 @@ class SoftwareEnableFeatureFlag(
         Software,
         blank = False,
         help_text = 'Software this feature flag is for',
-        on_delete = models.CASCADE,
+        on_delete = models.PROTECT,
         null = False,
         related_name = 'feature_flagging',
         verbose_name = 'Software'