diff --git a/src/KArtSell.Host/Jobs/ShadowRunJob.cs b/src/KArtSell.Host/Jobs/ShadowRunJob.cs
index db672c6c..c42adb80 100644
--- a/src/KArtSell.Host/Jobs/ShadowRunJob.cs
+++ b/src/KArtSell.Host/Jobs/ShadowRunJob.cs
@@ -113,6 +113,13 @@ public sealed class ShadowRunJob(
             var metrics = await calculator.CalculateAsync(
                 replayResult, ohlcvBars, feeSchedule, cancellationToken);
 
+            // CRITICAL: Validate metrics are not null (prevents silent failures)
+            if (metrics == null)
+            {
+                logger.LogError("Shadow run {RunId} metrics calculation returned NULL", command.RunId);
+                throw new InvalidOperationException($"Metrics cannot be null for run {command.RunId}");
+            }
+
             LogPhase3Complete(logger, command.RunId, null);
 
             // Phase 4: Phase segmentation
@@ -182,7 +189,10 @@ public sealed class ShadowRunJob(
     {
         try
         {
+            // CRITICAL: InsertShadowRunAsync MUST be called to persist metrics
+            logger.LogDebug("Inserting shadow run {RunId} with metrics to database", result.RunId);
             await queries.InsertShadowRunAsync(result, cancellationToken);
+            logger.LogDebug("Shadow run {RunId} metrics persisted successfully to database", result.RunId);
 
             var eventMessage = new OutboxMessage(
                 MessageId: Guid.NewGuid(),