diff --git a/games/__tests__/test_admin.py b/games/__tests__/test_admin.py
index af69463..97b4b29 100644
--- a/games/__tests__/test_admin.py
+++ b/games/__tests__/test_admin.py
@@ -83,26 +83,29 @@ def test_total_price_paid_display_zero(self):
 
     def test_latest_added_date_display(self):
         """Test latest_added_date shows most recent platform addition date"""
-
-        game = GameFactory(name="Test Game")
+        # Prevent factory from creating automatic platform relationship
+        game = GameFactory(name="Test Game", platforms=False)
         older_date = date.today() - timedelta(days=10)
         newer_date = date.today() - timedelta(days=5)
 
         # Add game to platform on different dates
-        GameOnPlatform.objects.create(
+        gop1 = GameOnPlatform.objects.create(
             game=game,
             platform=self.platform,
             vendor=self.vendor1,
-            added=older_date,
             deleted=False,
         )
-        GameOnPlatform.objects.create(
+        # Set the date after creation to bypass auto_now_add
+        GameOnPlatform.objects.filter(pk=gop1.pk).update(added=older_date)
+
+        gop2 = GameOnPlatform.objects.create(
             game=game,
             platform=self.platform,
             vendor=self.vendor2,
-            added=newer_date,
             deleted=False,
         )
+        # Set the date after creation to bypass auto_now_add
+        GameOnPlatform.objects.filter(pk=gop2.pk).update(added=newer_date)
 
         # Annotate as admin would
         game = (
@@ -116,9 +119,20 @@ def test_latest_added_date_display(self):
 
     def test_latest_added_date_display_never(self):
         """Test latest_added_date shows 'Never' for games without dates"""
-        game = GameFactory(name="Undated Game")
+        # Prevent factory from creating automatic platform relationship
+        game = GameFactory(name="Undated Game", platforms=False)
 
-        # Game with no platform relationships
+        # Create GameOnPlatform with added=None
+        gop = GameOnPlatform.objects.create(
+            game=game,
+            platform=self.platform,
+            vendor=self.vendor1,
+            deleted=False,
+        )
+        # Set added to None after creation (bypasses auto_now_add)
+        GameOnPlatform.objects.filter(pk=gop.pk).update(added=None)
+
+        # Annotate as admin would - AFTER updating the added field
         game = (
             Game.objects.all_with_orphaned()
             .annotate(latest_added=models.Max("platforms_meta_data__added"))
diff --git a/games/migrations/0006_alter_gameonplatform_added_and_more.py b/games/migrations/0006_alter_gameonplatform_added_and_more.py
new file mode 100644
index 0000000..5b54c49
--- /dev/null
+++ b/games/migrations/0006_alter_gameonplatform_added_and_more.py
@@ -0,0 +1,29 @@
+# Generated by Django 5.2.5 on 2026-01-24 12:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("games", "0005_rename_source_to_vendor"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="gameonplatform",
+            name="added",
+            field=models.DateField(auto_now_add=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name="gameonplatform",
+            name="price",
+            field=models.DecimalField(
+                blank=True,
+                decimal_places=2,
+                default=0.0,
+                max_digits=6,
+                null=True,
+                verbose_name="Purchase price",
+            ),
+        ),
+    ]
diff --git a/games/models.py b/games/models.py
index c63546b..51c2a48 100644
--- a/games/models.py
+++ b/games/models.py
@@ -115,7 +115,7 @@ class GameOnPlatform(models.Model):
     platform = models.ForeignKey(
         Platform, on_delete=models.CASCADE, related_name="games_meta_data"
     )
-    added = models.DateField(null=True, blank=True)
+    added = models.DateField(null=True, blank=True, auto_now_add=True)
     identifier = models.CharField(
         verbose_name="ID in the platform for generating URLs",
         max_length=255,
@@ -128,6 +128,7 @@ class GameOnPlatform(models.Model):
         max_digits=6,
         blank=True,
         null=True,
+        default=0.0,
     )
     vendor = models.ForeignKey(Vendor, on_delete=models.SET_NULL, null=True, blank=True)
     deleted = models.BooleanField(default=False, db_index=True)