@@ -50,0 +73,4 @@
+
+        var merged = new Dictionary<DateOnly, RevenueAccumulator>(capacity: 64);
+
+        foreach (var localDict in threadLocalDicts.Values)

@@ -50,2 +79,3 @@
             {
-                Period = g.Key,
+                ref var m = ref CollectionsMarshal.GetValueRefOrAddDefault(merged, date, out _);
+                m.CashAmount += local.CashAmount;

@@ -71,0 +110,4 @@
+                switch (t.PaymentType)
+                {
+                    case PaymentType.Cash: acc.CashAmount -= t.Amount; break;
+                    case PaymentType.Bank: acc.BankAmount -= t.Amount; break;

@@ -65,0 +69,4 @@
+
+                openShifts.Remove(employeeId);
+            }
+        }