diff --git a/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java b/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java
index 27dc39a8..7f6b31ce 100644
--- a/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java
+++ b/cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java
@@ -1,104 +1,61 @@
 package com.cameleer3.server.core.detail;
 
-import com.cameleer3.server.core.storage.ExecutionRepository;
+import com.cameleer3.server.core.storage.ExecutionStore;
+import com.cameleer3.server.core.storage.ExecutionStore.ProcessorRecord;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Optional;
+import java.util.*;
 
-/**
- * Provides execution detail with reconstructed processor tree.
- * <p>
- * This is a plain class (no Spring annotations) -- it lives in the core module
- * and is wired as a bean by the app module configuration.
- */
 public class DetailService {
 
-    private final ExecutionRepository repository;
+    private final ExecutionStore executionStore;
 
-    public DetailService(ExecutionRepository repository) {
-        this.repository = repository;
+    public DetailService(ExecutionStore executionStore) {
+        this.executionStore = executionStore;
     }
 
-    /**
-     * Get the full detail of a route execution, including the nested processor tree.
-     *
-     * @param executionId the execution ID to look up
-     * @return the execution detail, or empty if not found
-     */
     public Optional<ExecutionDetail> getDetail(String executionId) {
-        return repository.findRawById(executionId)
-                .map(this::toDetail);
+        return executionStore.findById(executionId)
+                .map(exec -> {
+                    List<ProcessorRecord> processors = executionStore.findProcessors(executionId);
+                    List<ProcessorNode> roots = buildTree(processors);
+                    return new ExecutionDetail(
+                            exec.executionId(), exec.routeId(), exec.agentId(),
+                            exec.status(), exec.startTime(), exec.endTime(),
+                            exec.durationMs() != null ? exec.durationMs() : 0L,
+                            exec.correlationId(), exec.exchangeId(),
+                            exec.errorMessage(), exec.errorStacktrace(),
+                            exec.diagramContentHash(), roots
+                    );
+                });
     }
 
-    private ExecutionDetail toDetail(RawExecutionRow row) {
-        List<ProcessorNode> roots = reconstructTree(
-                row.processorIds(),
-                row.processorTypes(),
-                row.processorStatuses(),
-                row.processorStarts(),
-                row.processorEnds(),
-                row.processorDurations(),
-                row.processorDiagramNodeIds(),
-                row.processorErrorMessages(),
-                row.processorErrorStacktraces(),
-                row.processorDepths(),
-                row.processorParentIndexes()
-        );
+    List<ProcessorNode> buildTree(List<ProcessorRecord> processors) {
+        if (processors.isEmpty()) return List.of();
 
-        return new ExecutionDetail(
-                row.executionId(),
-                row.routeId(),
-                row.agentId(),
-                row.status(),
-                row.startTime(),
-                row.endTime(),
-                row.durationMs(),
-                row.correlationId(),
-                row.exchangeId(),
-                row.errorMessage(),
-                row.errorStackTrace(),
-                row.diagramContentHash(),
-                roots
-        );
-    }
-
-    /**
-     * Reconstruct the nested processor tree from flat parallel arrays.
-     * <p>
-     * Uses parentIndexes to wire children: parentIndex == -1 means the node is a root.
-     * Otherwise, parentIndex is the array index of the parent node.
-     */
-    List<ProcessorNode> reconstructTree(
-            String[] ids, String[] types, String[] statuses,
-            java.time.Instant[] starts, java.time.Instant[] ends, long[] durations,
-            String[] diagramNodeIds, String[] errorMessages, String[] errorStacktraces,
-            int[] depths, int[] parentIndexes) {
-
-        if (ids == null || ids.length == 0) {
-            return List.of();
-        }
-
-        int len = ids.length;
-        ProcessorNode[] nodes = new ProcessorNode[len];
-
-        for (int i = 0; i < len; i++) {
-            nodes[i] = new ProcessorNode(
-                    ids[i], types[i], statuses[i],
-                    starts[i], ends[i], durations[i],
-                    diagramNodeIds[i], errorMessages[i], errorStacktraces[i]
-            );
+        Map<String, ProcessorNode> nodeMap = new LinkedHashMap<>();
+        for (ProcessorRecord p : processors) {
+            nodeMap.put(p.processorId(), new ProcessorNode(
+                    p.processorId(), p.processorType(), p.status(),
+                    p.startTime(), p.endTime(),
+                    p.durationMs() != null ? p.durationMs() : 0L,
+                    p.diagramNodeId(), p.errorMessage(), p.errorStacktrace()
+            ));
         }
 
         List<ProcessorNode> roots = new ArrayList<>();
-        for (int i = 0; i < len; i++) {
-            if (parentIndexes[i] == -1) {
-                roots.add(nodes[i]);
+        for (ProcessorRecord p : processors) {
+            ProcessorNode node = nodeMap.get(p.processorId());
+            if (p.parentProcessorId() == null) {
+                roots.add(node);
             } else {
-                nodes[parentIndexes[i]].addChild(nodes[i]);
+                ProcessorNode parent = nodeMap.get(p.parentProcessorId());
+                if (parent != null) {
+                    parent.addChild(node);
+                } else {
+                    roots.add(node); // orphan safety
+                }
             }
         }
-
         return roots;
     }
 }