Ensure log cleanup in multiple modes

@@ -53,6 +53,7 @@ from .graphrag.prompts import (
     SYSTEM_PROMPT_CHAPTER_GRAPH_ENHANCEMENT,
     format_graph_results_for_prompt
 )
+from utils.knowledge_logger import init_knowledge_log
 
 
 class StageOutputFormatError(ValueError):
@@ -470,6 +471,8 @@ class ReportAgent:
         self.state.query = query
         self.state.metadata.query = query
         self.state.mark_processing()
+        # 新一轮任务开始时重置知识查询日志，避免跨任务残留
+        init_knowledge_log(force_reset=True)
 
         normalized_reports = self._normalize_reports(reports)
 

@@ -656,7 +656,8 @@
 
                 let data = await fetchGraph(reportId);
                 let usedFallback = false;
-                if ((!data || !data.graph) && allowFallback) {
+                const allowLatestFallback = allowFallback && !reportId;
+                if ((!data || !data.graph) && allowLatestFallback) {
                     data = await fetchGraph(null);
                     usedFallback = !!(data && data.graph);
                 }
@@ -684,9 +685,25 @@
                         showToast(usedFallback ? '未找到指定图谱，已切换至最新版本' : '已刷新最新图谱');
                     }
                 } else {
-                    if (!graphReady) {
-                        showEmpty(true);
+                    showEmpty(true);
+                    graphReady = false;
+                    allNodes = [];
+                    allEdges = [];
+                    resetGraphSearchState();
+                    updateStats({
+                        total_nodes: 0,
+                        total_edges: 0,
+                        topic: 0,
+                        engine: 0,
+                        section: 0,
+                        search_query: 0,
+                        source: 0
+                    });
+                    if (network) {
+                        network.destroy();
+                        network = null;
                     }
+                    hideNodeDetail();
                     showLoading(false);
                     if (fromManual) {
                         showToast('未找到图谱数据');

@@ -5589,13 +5589,14 @@ function getConsoleContainer() {
 
             try {
                 const targetTaskId = graphPanelTaskId || (lastCompletedReportTask ? lastCompletedReportTask.task_id : null);
+                const allowLatestFallback = allowFallback && !targetTaskId;
                 let data = null;
                 let usedFallback = false;
 
                 if (targetTaskId) {
                     data = await fetchGraphData(targetTaskId);
                 }
-                if ((!data || !data.graph) && allowFallback) {
+                if ((!data || !data.graph) && allowLatestFallback) {
                     data = await fetchGraphData(null);
                     usedFallback = !!(data && data.graph);
                 }
@@ -5616,8 +5617,19 @@ function getConsoleContainer() {
                         setGraphPanelPlaceholder('面板已收起，点击“展示详情”查看');
                     }
                 } else {
+                    graphPanelData = { nodes: [], edges: [] };
+                    resetGraphSearchState();
+                    if (graphPanelNetwork) {
+                        graphPanelNetwork.destroy();
+                        graphPanelNetwork = null;
+                    }
+                    const innerCanvas = document.getElementById('graphPanelCanvasInner');
+                    if (innerCanvas) {
+                        innerCanvas.innerHTML = '';
+                    }
                     updateGraphStats({ nodes: [], edges: [] });
-                    setGraphPanelState('idle', '暂未找到知识图谱，请生成报告后刷新');
+                    setGraphPanelState('idle', targetTaskId ? '当前任务的知识图谱尚未生成，请稍后刷新' : '暂未找到知识图谱，请生成报告后刷新');
+                    setGraphPanelPlaceholder(targetTaskId ? '等待当前任务生成新的知识图谱...' : '暂未找到知识图谱，请生成报告后刷新');
                 }
             } catch (error) {
                 console.warn('刷新知识图谱失败:', error);
@@ -5636,6 +5648,16 @@ function getConsoleContainer() {
                 if (!panel) return;
                 panel.style.display = 'flex';
                 bindGraphPanelEvents();
+                graphPanelData = { nodes: [], edges: [] };
+                resetGraphSearchState();
+                if (graphPanelNetwork) {
+                    graphPanelNetwork.destroy();
+                    graphPanelNetwork = null;
+                }
+                const innerCanvas = document.getElementById('graphPanelCanvasInner');
+                if (innerCanvas) {
+                    innerCanvas.innerHTML = '';
+                }
                 updateGraphStats({ nodes: [], edges: [] });
                 setGraphPanelState('loading', '报告生成中，知识图谱生成后自动刷新');
                 setGraphPanelPlaceholder('正在生成知识图谱...');