Refactor merge dialog and improve search history sync

- Extract MergeDialog to separate component
- Update search history on entity rename
- Add dropdown refresh trigger mechanism
- Sync query label with entity changes
- Force graph re-render after updates

lightrag_webui/src/components/graph/EditablePropertyRow.tsx

@@ -4,17 +4,10 @@ import { toast } from 'sonner'
 import { updateEntity, updateRelation, checkEntityNameExists } from '@/api/lightrag'
 import { useGraphStore } from '@/stores/graph'
 import { useSettingsStore } from '@/stores/settings'
-import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogFooter,
-  DialogHeader,
-  DialogTitle
-} from '@/components/ui/Dialog'
-import Button from '@/components/ui/Button'
+import { SearchHistoryManager } from '@/utils/SearchHistoryManager'
 import { PropertyName, EditIcon, PropertyValue } from './PropertyRowComponents'
 import PropertyEditDialog from './PropertyEditDialog'
+import MergeDialog from './MergeDialog'
 
 /**
  * Interface for the EditablePropertyRow component props
@@ -123,6 +116,12 @@ const EditablePropertyRow = ({
               sourceEntity: entityId,
             })
             setMergeDialogOpen(true)
+
+            // Remove old entity name from search history
+            SearchHistoryManager.removeLabel(entityId)
+
+            // Note: Search Label update is deferred until user clicks refresh button in merge dialog
+
             toast.success(t('graphPanel.propertiesView.success.entityMerged'))
           } else {
             // Node was updated/renamed normally
@@ -134,6 +133,23 @@ const EditablePropertyRow = ({
               console.error('Error updating node in graph:', error)
               throw new Error('Failed to update node in graph')
             }
+
+            // Update search history: remove old name, add new name
+            if (name === 'entity_id') {
+              const currentLabel = useSettingsStore.getState().queryLabel
+
+              SearchHistoryManager.removeLabel(entityId)
+              SearchHistoryManager.addToHistory(finalValue)
+
+              // Trigger dropdown refresh to show updated search history
+              useSettingsStore.getState().triggerSearchLabelDropdownRefresh()
+
+              // If current queryLabel is the old entity name, update to new name
+              if (currentLabel === entityId) {
+                useSettingsStore.getState().setQueryLabel(finalValue)
+              }
+            }
+
             toast.success(t('graphPanel.propertiesView.success.entityUpdated'))
           }
 
@@ -207,17 +223,28 @@ const EditablePropertyRow = ({
     const info = mergeDialogInfo
     const graphState = useGraphStore.getState()
     const settingsState = useSettingsStore.getState()
+    const currentLabel = settingsState.queryLabel
 
+    // Clear graph state
     graphState.clearSelection()
     graphState.setGraphDataFetchAttempted(false)
     graphState.setLastSuccessfulQueryLabel('')
 
     if (useMergedStart && info?.targetEntity) {
+      // Use merged entity as new start point (might already be set in handleSave)
       settingsState.setQueryLabel(info.targetEntity)
     } else {
-      graphState.incrementGraphDataVersion()
+      // Keep current start point - refresh by resetting and restoring label
+      // This handles the case where user wants to stay with current label
+      settingsState.setQueryLabel('')
+      setTimeout(() => {
+        settingsState.setQueryLabel(currentLabel)
+      }, 50)
     }
 
+    // Force graph re-render and reset zoom/scale (same as refresh button behavior)
+    graphState.incrementGraphDataVersion()
+
     setMergeDialogOpen(false)
     setMergeDialogInfo(null)
     toast.info(t('graphPanel.propertiesView.mergeDialog.refreshing'))
@@ -242,42 +269,17 @@ const EditablePropertyRow = ({
         errorMessage={errorMessage}
       />
 
-      <Dialog
-        open={mergeDialogOpen}
+      <MergeDialog
+        mergeDialogOpen={mergeDialogOpen}
+        mergeDialogInfo={mergeDialogInfo}
         onOpenChange={(open) => {
           setMergeDialogOpen(open)
           if (!open) {
             setMergeDialogInfo(null)
           }
         }}
-      >
-        <DialogContent>
-          <DialogHeader>
-            <DialogTitle>{t('graphPanel.propertiesView.mergeDialog.title')}</DialogTitle>
-            <DialogDescription>
-              {t('graphPanel.propertiesView.mergeDialog.description', {
-                source: mergeDialogInfo?.sourceEntity ?? '',
-                target: mergeDialogInfo?.targetEntity ?? '',
-              })}
-            </DialogDescription>
-          </DialogHeader>
-          <p className="text-sm text-muted-foreground">
-            {t('graphPanel.propertiesView.mergeDialog.refreshHint')}
-          </p>
-          <DialogFooter className="mt-4 flex-col gap-2 sm:flex-row sm:justify-end">
-            <Button
-              type="button"
-              variant="outline"
-              onClick={() => handleMergeRefresh(false)}
-            >
-              {t('graphPanel.propertiesView.mergeDialog.keepCurrentStart')}
-            </Button>
-            <Button type="button" onClick={() => handleMergeRefresh(true)}>
-              {t('graphPanel.propertiesView.mergeDialog.useMergedStart')}
-            </Button>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
+        onRefresh={handleMergeRefresh}
+      />
     </div>
   )
 }

lightrag_webui/src/components/graph/GraphLabels.tsx

@@ -17,6 +17,7 @@ import { getPopularLabels, searchLabels } from '@/api/lightrag'
 const GraphLabels = () => {
   const { t } = useTranslation()
   const label = useSettingsStore.use.queryLabel()
+  const dropdownRefreshTrigger = useSettingsStore.use.searchLabelDropdownRefreshTrigger()
   const [isRefreshing, setIsRefreshing] = useState(false)
   const [refreshTrigger, setRefreshTrigger] = useState(0)
   const [selectKey, setSelectKey] = useState(0)
@@ -54,6 +55,18 @@ const GraphLabels = () => {
     initializeHistory()
   }, [])
 
+  // Force AsyncSelect to re-render when label changes externally (e.g., from entity rename/merge)
+  useEffect(() => {
+    setSelectKey(prev => prev + 1)
+  }, [label])
+
+  // Force AsyncSelect to re-render when dropdown refresh is triggered (e.g., after entity rename)
+  useEffect(() => {
+    if (dropdownRefreshTrigger > 0) {
+      setSelectKey(prev => prev + 1)
+    }
+  }, [dropdownRefreshTrigger])
+
   const fetchData = useCallback(
     async (query?: string): Promise<string[]> => {
       let results: string[] = [];
@@ -223,6 +236,9 @@ const GraphLabels = () => {
 
             // Update the label to trigger data loading
             useSettingsStore.getState().setQueryLabel(newLabel);
+
+            // Force graph re-render and reset zoom/scale (must be AFTER setQueryLabel)
+            useGraphStore.getState().incrementGraphDataVersion();
           }}
           clearable={false}  // Prevent clearing value on reselect
           debounceTime={500}

lightrag_webui/src/components/graph/MergeDialog.tsx

@@ -0,0 +1,70 @@
+import { useTranslation } from 'react-i18next'
+import { useSettingsStore } from '@/stores/settings'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle
+} from '@/components/ui/Dialog'
+import Button from '@/components/ui/Button'
+
+interface MergeDialogProps {
+  mergeDialogOpen: boolean
+  mergeDialogInfo: {
+    targetEntity: string
+    sourceEntity: string
+  } | null
+  onOpenChange: (open: boolean) => void
+  onRefresh: (useMergedStart: boolean) => void
+}
+
+/**
+ * MergeDialog component that appears after a successful entity merge
+ * Allows user to choose whether to use the merged entity or keep current start point
+ */
+const MergeDialog = ({
+  mergeDialogOpen,
+  mergeDialogInfo,
+  onOpenChange,
+  onRefresh
+}: MergeDialogProps) => {
+  const { t } = useTranslation()
+  const currentQueryLabel = useSettingsStore.use.queryLabel()
+
+  return (
+    <Dialog open={mergeDialogOpen} onOpenChange={onOpenChange}>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>{t('graphPanel.propertiesView.mergeDialog.title')}</DialogTitle>
+          <DialogDescription>
+            {t('graphPanel.propertiesView.mergeDialog.description', {
+              source: mergeDialogInfo?.sourceEntity ?? '',
+              target: mergeDialogInfo?.targetEntity ?? '',
+            })}
+          </DialogDescription>
+        </DialogHeader>
+        <p className="text-sm text-muted-foreground">
+          {t('graphPanel.propertiesView.mergeDialog.refreshHint')}
+        </p>
+        <DialogFooter className="mt-4 flex-col gap-2 sm:flex-row sm:justify-end">
+          {currentQueryLabel !== mergeDialogInfo?.sourceEntity && (
+            <Button
+              type="button"
+              variant="outline"
+              onClick={() => onRefresh(false)}
+            >
+              {t('graphPanel.propertiesView.mergeDialog.keepCurrentStart')}
+            </Button>
+          )}
+          <Button type="button" onClick={() => onRefresh(true)}>
+            {t('graphPanel.propertiesView.mergeDialog.useMergedStart')}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+export default MergeDialog

lightrag_webui/src/stores/settings.ts

@@ -78,6 +78,10 @@ interface SettingsState {
 
   currentTab: Tab
   setCurrentTab: (tab: Tab) => void
+
+  // Search label dropdown refresh trigger (non-persistent, runtime only)
+  searchLabelDropdownRefreshTrigger: number
+  triggerSearchLabelDropdownRefresh: () => void
 }
 
 const useSettingsStoreBase = create<SettingsState>()(
@@ -229,7 +233,14 @@ const useSettingsStoreBase = create<SettingsState>()(
         })
       },
 
-      setUserPromptHistory: (history: string[]) => set({ userPromptHistory: history })
+      setUserPromptHistory: (history: string[]) => set({ userPromptHistory: history }),
+
+      // Search label dropdown refresh trigger (not persisted)
+      searchLabelDropdownRefreshTrigger: 0,
+      triggerSearchLabelDropdownRefresh: () =>
+        set((state) => ({
+          searchLabelDropdownRefreshTrigger: state.searchLabelDropdownRefreshTrigger + 1
+        }))
     }),
     {
       name: 'settings-storage',