add upload times

dotnet/SafelyYou/UploadTimes.cs

@@ -0,0 +1,19 @@
+using System.Collections.Concurrent;
+using System.Numerics;
+
+namespace SafelyYou;
+
+public sealed class UploadTimes
+{
+    private readonly ConcurrentDictionary<DeviceId, (BigInteger TotalUploadTime, int UploadCounts)> _uploadHistories = new();
+
+    public void Add(DeviceId deviceId, BigInteger uploadTimeNanos)
+    {
+        if (!_uploadHistories.TryGetValue(deviceId, out var history))
+        {
+            history = (BigInteger.Zero, 0);
+        }
+
+        _uploadHistories[deviceId] = (history.TotalUploadTime + uploadTimeNanos, history.UploadCounts + 1);
+    }
+}