stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Provcache/WriteBehindMetrics.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace StellaOps.Provcache;
+
+/// <summary>
+/// Metrics for the write-behind queue.
+/// </summary>
+public sealed record WriteBehindMetrics
+{
+    public required long TotalEnqueued { get; init; }
+    public required long TotalPersisted { get; init; }
+    public required long TotalFailed { get; init; }
+    public required long TotalRetries { get; init; }
+    public required long TotalBatches { get; init; }
+    public required long CurrentQueueDepth { get; init; }
+    public required DateTimeOffset Timestamp { get; init; }
+}