Add backlog decrease count

CHANGELOG.md

@@ -22,6 +22,7 @@
   * Finished (count)
   * Unfinished (count)
   * Refunded (count)
+  * Backlog Decrease (count)
 
 ### Improved
 * game overview: simplify playtime range display

games/templates/stats.html

@@ -64,6 +64,10 @@
                             <td class="px-2 sm:px-4 md:px-6 md:py-2">Unfinished</td>
                             <td class="px-2 sm:px-4 md:px-6 md:py-2 font-mono">{{ purchased_unfinished.count }} ({{ unfinished_purchases_percent }}%)</td>
                         </tr>
+                        <tr>
+                            <td class="px-2 sm:px-4 md:px-6 md:py-2">Backlog Decrease</td>
+                            <td class="px-2 sm:px-4 md:px-6 md:py-2 font-mono">{{ backlog_decrease_count }}</td>
+                        </tr>
                         <tr>
                             <td class="px-2 sm:px-4 md:px-6 md:py-2">Spendings ({{ total_spent_currency }})</td>
                             <td class="px-2 sm:px-4 md:px-6 md:py-2 font-mono">{{ total_spent }} ({{ spent_per_game }}/game)</td>

games/views.py

@@ -356,6 +356,12 @@ def stats(request, year: int = 0):
     for item in total_playtime_per_platform:
         item["formatted_playtime"] = format_duration(item["total_playtime"], "%2.0H")
 
+    backlog_decrease_count = (
+        Purchase.objects.filter(date_purchased__year__lt=year)
+        .filter(date_finished__year=year)
+        .count()
+    )
+
     context = {
         "total_hours": format_duration(
             year_sessions.total_duration_unformatted(), "%2.0H"
@@ -390,6 +396,7 @@ def stats(request, year: int = 0):
         ),
         "all_purchased_refunded_this_year": all_purchased_refunded_this_year,
         "all_purchased_this_year": all_purchased_this_year,
+        "backlog_decrease_count": backlog_decrease_count,
     }
 
     request.session["return_path"] = request.path