test(notification-outbox): exercise per-site oldest-age reduction and Retrying status

tests/ScadaLink.ConfigurationDatabase.Tests/NotificationOutboxRepositoryPerSiteKpiTests.cs

@@ -39,6 +39,12 @@ public class NotificationOutboxRepositoryPerSiteKpiTests
         // plant-b: 1 delivered in-window, 1 pending (fresh)
         ctx.Notifications.Add(NewNotification("plant-b", NotificationStatus.Delivered, createdAt: now.AddHours(-2), deliveredAt: now.AddMinutes(-2)));
         ctx.Notifications.Add(NewNotification("plant-b", NotificationStatus.Pending, createdAt: now.AddMinutes(-1)));
+        // plant-c: 2 non-terminal rows of clearly different ages — pending 90m ago,
+        // retrying 40m ago. Both predate the 10m stuck cutoff. Exercises the
+        // in-memory g.Min(CreatedAt) oldest-age reduction and the Retrying branch
+        // of the QueueDepth/StuckCount predicates.
+        ctx.Notifications.Add(NewNotification("plant-c", NotificationStatus.Pending, createdAt: now.AddMinutes(-90)));
+        ctx.Notifications.Add(NewNotification("plant-c", NotificationStatus.Retrying, createdAt: now.AddMinutes(-40)));
         await ctx.SaveChangesAsync();
 
         var repo = new NotificationOutboxRepository(ctx);
@@ -56,6 +62,21 @@ public class NotificationOutboxRepositoryPerSiteKpiTests
         Assert.Equal(1, b.QueueDepth);
         Assert.Equal(0, b.StuckCount);
         Assert.Equal(1, b.DeliveredLastInterval);
+
+        // plant-c: both the Pending and Retrying rows count toward QueueDepth;
+        // both predate the stuck cutoff so both are stuck. OldestPendingAge must
+        // reflect the older (90m) row, not the 10m Retrying one.
+        var c = result.Single(s => s.SourceSiteId == "plant-c");
+        Assert.Equal(2, c.QueueDepth);
+        Assert.Equal(2, c.StuckCount);
+        Assert.Equal(0, c.ParkedCount);
+        Assert.NotNull(c.OldestPendingAge);
+        // Tolerant lower bound to absorb clock skew between seed time and the
+        // `now` captured inside ComputePerSiteKpisAsync.
+        Assert.True(c.OldestPendingAge >= TimeSpan.FromMinutes(85),
+            $"expected OldestPendingAge >= 85m, got {c.OldestPendingAge}");
+        Assert.True(c.OldestPendingAge < TimeSpan.FromMinutes(95),
+            $"expected OldestPendingAge < 95m, got {c.OldestPendingAge}");
     }
 
     [Fact]