diff --git a/src/dotnet/QuantEngine.Application/Services/KisDataCollectionOrchestrator.cs b/src/dotnet/QuantEngine.Application/Services/KisDataCollectionOrchestrator.cs
index c6da4209..2a4d43a7 100644
--- a/src/dotnet/QuantEngine.Application/Services/KisDataCollectionOrchestrator.cs
+++ b/src/dotnet/QuantEngine.Application/Services/KisDataCollectionOrchestrator.cs
@@ -168,6 +168,7 @@ public class KisDataCollectionOrchestrator : ICollectionOrchestrator
                 }
             };
             File.WriteAllText(outputPath, JsonSerializer.Serialize(outputData, new JsonSerializerOptions { WriteIndented = true }));
+            LogLineageEvent(runId, result.Status, result.SuccessCount, result.ErrorCount);
 
             _logger.LogInformation("Collection run {RunId} finished with status {Status}: {Success} ok, {Errors} errors",
                 runId, result.Status, result.SuccessCount, result.ErrorCount);
@@ -220,6 +221,46 @@ public class KisDataCollectionOrchestrator : ICollectionOrchestrator
 
         return false;
     }
+
+    private static void LogLineageEvent(string runId, string status, int successCount, int errorCount)
+    {
+        try
+        {
+            var baseDir = AppContext.BaseDirectory;
+            var current = new DirectoryInfo(baseDir);
+            string? repoRoot = null;
+
+            while (current != null)
+            {
+                if (Directory.Exists(Path.Combine(current.FullName, ".git")))
+                {
+                    repoRoot = current.FullName;
+                    break;
+                }
+                current = current.Parent;
+            }
+
+            if (repoRoot != null)
+            {
+                var runtimeDir = Path.Combine(repoRoot, "runtime");
+                Directory.CreateDirectory(runtimeDir);
+                var lineagePath = Path.Combine(runtimeDir, "lineage_events.jsonl");
+
+                var ev = new
+                {
+                    @event = "collection_run_completed",
+                    run_id = runId,
+                    status = status,
+                    success_count = successCount,
+                    error_count = errorCount,
+                    timestamp = DataNormalizationHelper.KstNowIso()
+                };
+
+                File.AppendAllText(lineagePath, JsonSerializer.Serialize(ev) + "\n");
+            }
+        }
+        catch { /* Robust fallback */ }
+    }
 }