Improve duration handling for sessions and games

games/migrations/0013_game_playtime.py

@@ -0,0 +1,35 @@
+# Generated by Django 5.1.7 on 2025-03-25 20:33
+
+import datetime
+
+from django.db import migrations, models
+from django.db.models import F, Sum
+
+
+def calculate_game_playtime(apps, schema_editor):
+    Game = apps.get_model("games", "Game")
+    games = Game.objects.all()
+    for game in games:
+        total_playtime = game.sessions.aggregate(
+            total_playtime=Sum(F("duration_total"))
+        )["total_playtime"]
+        if total_playtime:
+            game.playtime = total_playtime
+            game.save(update_fields=["playtime"])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("games", "0012_alter_session_duration_calculated"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="game",
+            name="playtime",
+            field=models.DurationField(
+                blank=True, default=datetime.timedelta(0), editable=False
+            ),
+        ),
+        migrations.RunPython(calculate_game_playtime),
+    ]