feat(sitecall-audit): add SourceNode to SiteCallOperational + SiteCall entity

tests/ScadaLink.Commons.Tests/Entities/Audit/SiteCallTests.cs

@@ -0,0 +1,40 @@
+using ScadaLink.Commons.Entities.Audit;
+using ScadaLink.Commons.Types;
+
+namespace ScadaLink.Commons.Tests.Entities.Audit;
+
+/// <summary>
+/// Verifies the <see cref="SiteCall"/> central operational entity carries the
+/// SourceNode column (additive, nullable) through init-only construction and
+/// <c>with</c> expressions. Sibling to <see cref="AuditEventTests"/>.
+/// </summary>
+public class SiteCallTests
+{
+    private static SiteCall MinimalRow() => new()
+    {
+        TrackedOperationId = TrackedOperationId.New(),
+        Channel = "ApiOutbound",
+        Target = "ERP.GetOrder",
+        SourceSite = "site-01",
+        Status = "Submitted",
+        RetryCount = 0,
+        CreatedAtUtc = new DateTime(2026, 5, 23, 12, 0, 0, DateTimeKind.Utc),
+        UpdatedAtUtc = new DateTime(2026, 5, 23, 12, 0, 0, DateTimeKind.Utc),
+        IngestedAtUtc = new DateTime(2026, 5, 23, 12, 0, 1, DateTimeKind.Utc),
+    };
+
+    [Fact]
+    public void SiteCall_carries_SourceNode()
+    {
+        // SourceNode identifies the cluster node that emitted the cached call
+        // (site node-a/node-b or central-a/central-b). Additive nullable init
+        // property — defaults to null on rows ingested before the column
+        // existed, and round-trips its value via `with` expressions.
+        var row = MinimalRow();
+        Assert.Null(row.SourceNode);
+
+        var stamped = row with { SourceNode = "node-b" };
+        Assert.Equal("node-b", stamped.SourceNode);
+        Assert.Null(row.SourceNode);
+    }
+}