diff --git a/stude/accounts/migrations/0004_alter_customuser_course_alter_customuser_semester_and_more.py b/stude/accounts/migrations/0004_alter_customuser_course_alter_customuser_semester_and_more.py
new file mode 100644
index 0000000..0527dd0
--- /dev/null
+++ b/stude/accounts/migrations/0004_alter_customuser_course_alter_customuser_semester_and_more.py
@@ -0,0 +1,32 @@
+# Generated by Django 4.2.2 on 2023-07-04 10:04
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('semesters', '0001_initial'),
+        ('courses', '0002_initial'),
+        ('year_levels', '0001_initial'),
+        ('accounts', '0003_customuser_subjects'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='customuser',
+            name='course',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='courses.course'),
+        ),
+        migrations.AlterField(
+            model_name='customuser',
+            name='semester',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='semesters.semester'),
+        ),
+        migrations.AlterField(
+            model_name='customuser',
+            name='year_level',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='year_levels.year_level'),
+        ),
+    ]
diff --git a/stude/accounts/models.py b/stude/accounts/models.py
index 24adb8e..80565bf 100644
--- a/stude/accounts/models.py
+++ b/stude/accounts/models.py
@@ -41,17 +41,17 @@ class CustomUser(AbstractUser):
     avatar = models.ImageField(upload_to=_get_upload_to, null=True)
     course = models.ForeignKey(
         Course,
-        on_delete=models.CASCADE,
+        on_delete=models.SET_NULL,
         null=True
     )
     year_level = models.ForeignKey(
         Year_Level,
-        on_delete=models.CASCADE,
+        on_delete=models.SET_NULL,
         null=True
     )
     semester = models.ForeignKey(
         Semester,
-        on_delete=models.CASCADE,
+        on_delete=models.SET_NULL,
         null=True
     )
     subjects = models.ManyToManyField(
diff --git a/stude/config/settings.py b/stude/config/settings.py
index 8ebcd62..a7ccf2b 100644
--- a/stude/config/settings.py
+++ b/stude/config/settings.py
@@ -182,3 +182,5 @@ MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
 # https://docs.djangoproject.com/en/4.2/ref/settings/#default-auto-field
 
 DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+
+DOMAIN = 'stude://'
diff --git a/stude/student_status/migrations/0005_alter_studentstatus_subject.py b/stude/student_status/migrations/0005_alter_studentstatus_subject.py
new file mode 100644
index 0000000..845a322
--- /dev/null
+++ b/stude/student_status/migrations/0005_alter_studentstatus_subject.py
@@ -0,0 +1,20 @@
+# Generated by Django 4.2.2 on 2023-07-04 10:01
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('subjects', '0002_subjectstudent_subject_students'),
+        ('student_status', '0004_alter_studentstatus_study_group'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='studentstatus',
+            name='subject',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='subjects.subject'),
+        ),
+    ]
diff --git a/stude/student_status/models.py b/stude/student_status/models.py
index b2ca891..2787206 100644
--- a/stude/student_status/models.py
+++ b/stude/student_status/models.py
@@ -11,7 +11,7 @@ class StudentStatus(models.Model):
     x = models.FloatField(null=True)
     y = models.FloatField(null=True)
     subject = models.ForeignKey(
-        'subjects.Subject', on_delete=models.CASCADE, null=True)
+        'subjects.Subject', on_delete=models.SET_NULL, null=True)
     active = models.BooleanField(default=False)
     timestamp = models.DateField(auto_now_add=True)
     study_group = models.ManyToManyField(