Background tracker.

backend/src/Squidex.Infrastructure/UsageTracking/BackgroundUsageTracker.cs

@@ -95,7 +95,7 @@ namespace Squidex.Infrastructure.UsageTracking
 
             category = GetCategory(category);
 
-            jobs.AddOrUpdate((key, category, date), counters, (k, p) => p.Aggregate(counters));
+            jobs.AddOrUpdate((key, category, date), counters, (k, p) => p.SumUp(counters));
 
             return Task.CompletedTask;
         }
@@ -161,7 +161,7 @@ namespace Squidex.Infrastructure.UsageTracking
 
             foreach (var usage in queried)
             {
-                result.MergeIn(usage.Counters);
+                result.SumUp(usage.Counters);
             }
 
             return result;

backend/src/Squidex.Infrastructure/UsageTracking/Counters.cs

@@ -44,16 +44,7 @@ namespace Squidex.Infrastructure.UsageTracking
             return (long)value;
         }
 
-        public Counters Aggregate(Counters counters)
-        {
-            var result = new Counters(this);
-
-            result.MergeIn(counters);
-
-            return result;
-        }
-
-        public void MergeIn(Counters counters)
+        public Counters SumUp(Counters counters)
         {
             foreach (var (key, value) in counters)
             {
@@ -66,6 +57,8 @@ namespace Squidex.Infrastructure.UsageTracking
 
                 this[key] = newValue;
             }
+
+            return this;
         }
     }
 }