stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Provcache/DecisionDigestBuilder.Timestamps.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace StellaOps.Provcache;
+
+public sealed partial class DecisionDigestBuilder
+{
+    /// <summary>
+    /// Sets explicit timestamps for created and expires.
+    /// </summary>
+    public DecisionDigestBuilder WithTimestamps(DateTimeOffset createdAt, DateTimeOffset expiresAt)
+    {
+        _createdAt = createdAt;
+        _expiresAt = expiresAt;
+        return this;
+    }
+
+    /// <summary>
+    /// Sets timestamps using the default TTL from options.
+    /// </summary>
+    public DecisionDigestBuilder WithDefaultTimestamps()
+    {
+        _createdAt = _timeProvider.GetUtcNow();
+        _expiresAt = _createdAt.Value.Add(_options.DefaultTtl);
+        return this;
+    }
+}