diff --git a/backend/controller/log_proxy.go b/backend/controller/log_proxy.go
index 04249c2..2449397 100644
--- a/backend/controller/log_proxy.go
+++ b/backend/controller/log_proxy.go
@@ -22,7 +22,7 @@ type LogProxyHandler struct {
 	ds *LogDSHandler
 }
 
-const maxLogQueryLimit = 500 // 单次查询上限，防止平台承载过大数据 // Logan.Li
+const maxLogQueryLimit = 500
 
 func NewLogProxyHandler(ds *LogDSHandler) *LogProxyHandler {
 	return &LogProxyHandler{ds: ds}
@@ -149,19 +149,36 @@ func (h *LogProxyHandler) QueryES(c *gin.Context) {
 			},
 		}
 		if req.Start != "" || req.End != "" {
-			rangeQ := map[string]interface{}{"range": map[string]interface{}{"@timestamp": map[string]string{}}}
-			r := rangeQ["range"].(map[string]interface{})["@timestamp"].(map[string]string)
-			if req.Start != "" {
-				r["gte"] = req.Start
+			// ES 7.2 date_time 格式要求 +00:00 而非 Z；兼容 @timestamp 与 timestamp // Logan.Li
+			buildRangeVal := func(v string) string {
+				return strings.Replace(v, "Z", "+00:00", 1)
 			}
-			if req.End != "" {
-				r["lte"] = req.End
+			rangeCond := map[string]interface{}{
+				"bool": map[string]interface{}{
+					"should": []interface{}{
+						map[string]interface{}{"range": map[string]interface{}{"@timestamp": map[string]string{}}},
+						map[string]interface{}{"range": map[string]interface{}{"timestamp": map[string]string{}}},
+					},
+					"minimum_should_match": 1,
+				},
+			}
+			for _, clause := range rangeCond["bool"].(map[string]interface{})["should"].([]interface{}) {
+				rng := clause.(map[string]interface{})["range"].(map[string]interface{})
+				for _, v := range rng {
+					r := v.(map[string]string)
+					if req.Start != "" {
+						r["gte"] = buildRangeVal(req.Start)
+					}
+					if req.End != "" {
+						r["lte"] = buildRangeVal(req.End)
+					}
+				}
 			}
 			searchBody["query"] = map[string]interface{}{
 				"bool": map[string]interface{}{
 					"must": []interface{}{
 						searchBody["query"],
-						rangeQ,
+						rangeCond,
 					},
 				},
 			}
@@ -200,6 +217,8 @@ func parseLogTime(s string) (time.Time, error) {
 		}
 		return time.Unix(n, 0), nil
 	}
+	// ES 7.2 date_time 不接受 Z，转 +00:00
+	s = strings.Replace(s, "Z", "+00:00", 1)
 	return time.Parse(time.RFC3339, s)
 }
 
@@ -287,4 +306,4 @@ func pickESMessage(src map[string]interface{}) string {
 		return string(b[:500]) + "..."
 	}
 	return string(b)
-}
\ No newline at end of file
+}
diff --git a/frontend/src/components/aiops/AIOpsAssistant.tsx b/frontend/src/components/aiops/AIOpsAssistant.tsx
index 891666d..1f44a33 100644
--- a/frontend/src/components/aiops/AIOpsAssistant.tsx
+++ b/frontend/src/components/aiops/AIOpsAssistant.tsx
@@ -6,23 +6,6 @@ import { Input } from '@/components/ui/input';
 import { Badge } from '@/components/ui/badge';
 import { ScrollArea } from '@/components/ui/scroll-area';
 import { Avatar, AvatarFallback } from '@/components/ui/avatar';
-import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogFooter,
-  DialogHeader,
-  DialogTitle,
-} from '@/components/ui/dialog';
-import { Label } from '@/components/ui/label';
-import {
-  Select,
-  SelectContent,
-  SelectItem,
-  SelectTrigger,
-  SelectValue,
-} from '@/components/ui/select';
-import { Switch } from '@/components/ui/switch';
 import { toast } from 'sonner';
 import { aiApi, alertApi, agentApi, dashboardStatsApi, type LLMConfigData, type ChatHistoryItem } from '@/api';
 import {
@@ -40,7 +23,6 @@ import {
   Brain,
   Loader2,
   CheckCircle2,
-  Wifi,
   Square,
 } from 'lucide-react';
 import type { JsonData } from '@/types/common';
@@ -154,9 +136,6 @@ export function AIOpsAssistant() {
   const abortRef = useRef<AbortController | null>(null);
   // 组件卸载时中止进行中的流式请求，避免 setState on unmounted // Logan.Li
   useEffect(() => () => abortRef.current?.abort(), []);
-  const [isConfigOpen, setIsConfigOpen] = useState(false);
-  const [saving, setSaving] = useState(false);
-  const [testing, setTesting] = useState(false);
   const [config, setConfig] = useState<LLMConfigData>(defaultConfig);
   const [configReady, setConfigReady] = useState(false); // 已配置且启用
   const [contextLoading, setContextLoading] = useState<string | null>(null); // 快捷操作拉取平台数据中
@@ -209,50 +188,6 @@ export function AIOpsAssistant() {
     loadHistory();
   }, []);
 
-  // 切换提供商时自动填充默认 endpoint + 模型 // Logan.Li
-  const handleProviderChange = (provider: string) => {
-    const p = LLM_PROVIDERS.find((x) => x.id === provider);
-    setConfig((prev) => ({
-      ...prev,
-      provider,
-      endpoint: p?.defaultEndpoint || prev.endpoint,
-      model: p?.models[0] || prev.model,
-    }));
-  };
-
-  // 保存配置 // Logan.Li
-  const handleSaveConfig = async () => {
-    if (config.enabled && !config.api_key && config.provider !== 'ollama') {
-      toast.error('请填写 API Key');
-      return;
-    }
-    setSaving(true);
-    try {
-      const saved = await aiApi.saveConfig(config);
-      setConfig(saved);
-      setConfigReady(!!(saved.enabled && (saved as JsonData).configured));
-      toast.success('配置已保存');
-      setIsConfigOpen(false);
-    } catch (e) {
-      toast.error(e instanceof Error ? e.message : '保存失败');
-    } finally {
-      setSaving(false);
-    }
-  };
-
-  // 测试连接 // Logan.Li
-  const handleTest = async () => {
-    setTesting(true);
-    try {
-      await aiApi.testConnection();
-      toast.success('LLM 服务连接成功');
-    } catch (e) {
-      toast.error(e instanceof Error ? e.message : '连接失败');
-    } finally {
-      setTesting(false);
-    }
-  };
-
   // 发送一条消息的核心逻辑（流式输出，逐步填充助手气泡） // Logan.Li
   const sendMessage = async (text: string) => {
     const userMsg: Message = {
@@ -367,7 +302,6 @@ export function AIOpsAssistant() {
     toast.success('已开始新对话');
   };
 
-  const currentProvider = LLM_PROVIDERS.find((p) => p.id === config.provider);
 
   return (
     <div className="space-y-6">
@@ -383,12 +317,21 @@ export function AIOpsAssistant() {
           </div>
         </div>
         <div className="flex items-center gap-3">
-          {configReady && (
+          {configReady ? (
             <Badge variant="outline" className="border-emerald-500/30 text-emerald-400 bg-emerald-500/10">
               <CheckCircle2 className="h-3 w-3 mr-1" />
               {config.model}
             </Badge>
-          )}
+          ) : null}
+          <Button
+            variant="outline"
+            size="sm"
+            className="border-slate-700 text-slate-300 hover:text-purple-400"
+            onClick={() => navigate('/ai-llm-config')}
+          >
+            <Settings className="h-4 w-4 mr-1" />
+            模型配置
+          </Button>
         </div>
       </div>
 
@@ -564,131 +507,6 @@ export function AIOpsAssistant() {
         </Card>
       </div>
 
-      {/* LLM Config Dialog */}
-      <Dialog open={isConfigOpen} onOpenChange={setIsConfigOpen}>
-        <DialogContent className="max-w-2xl bg-slate-900 border-slate-700 text-slate-100">
-          <DialogHeader>
-            <DialogTitle>大模型配置</DialogTitle>
-            <DialogDescription className="text-slate-500">
-              配置 AI 助手使用的大语言模型（支持 OpenAI 兼容接口）
-            </DialogDescription>
-          </DialogHeader>
-          <div className="space-y-4 py-4 max-h-[60vh] overflow-y-auto pr-1">
-            {/* 启用开关 */}
-            <div className="flex items-center justify-between rounded-lg border border-slate-700 p-3">
-              <div>
-                <p className="text-sm font-medium text-slate-200">启用 AI 助手</p>
-                <p className="text-xs text-slate-500">关闭后将无法进行对话</p>
-              </div>
-              <Switch checked={config.enabled} onCheckedChange={(v) => setConfig({ ...config, enabled: v })} />
-            </div>
-
-            <div className="grid grid-cols-2 gap-4">
-              <div>
-                <Label className="text-slate-300">提供商</Label>
-                <Select value={config.provider} onValueChange={handleProviderChange}>
-                  <SelectTrigger className="bg-slate-800 border-slate-700 text-slate-100 mt-1">
-                    <SelectValue />
-                  </SelectTrigger>
-                  <SelectContent className="bg-slate-800 border-slate-700">
-                    {LLM_PROVIDERS.map((p) => (
-                      <SelectItem key={p.id} value={p.id} className="text-slate-100">{p.name}</SelectItem>
-                    ))}
-                  </SelectContent>
-                </Select>
-              </div>
-              <div>
-                <Label className="text-slate-300">模型</Label>
-                {currentProvider && currentProvider.models.length > 0 ? (
-                  <Select value={config.model} onValueChange={(v) => setConfig({ ...config, model: v })}>
-                    <SelectTrigger className="bg-slate-800 border-slate-700 text-slate-100 mt-1">
-                      <SelectValue />
-                    </SelectTrigger>
-                    <SelectContent className="bg-slate-800 border-slate-700">
-                      {currentProvider.models.map((m) => (
-                        <SelectItem key={m} value={m} className="text-slate-100">{m}</SelectItem>
-                      ))}
-                    </SelectContent>
-                  </Select>
-                ) : (
-                  <Input
-                    value={config.model}
-                    onChange={(e) => setConfig({ ...config, model: e.target.value })}
-                    placeholder="输入模型名称"
-                    className="bg-slate-800 border-slate-700 text-slate-100 mt-1"
-                  />
-                )}
-              </div>
-            </div>
-            <div>
-              <Label className="text-slate-300">API Key {config.provider === 'ollama' && <span className="text-xs text-slate-500">(本地 Ollama 通常无需)</span>}</Label>
-              <Input
-                type="password"
-                value={config.api_key}
-                onChange={(e) => setConfig({ ...config, api_key: e.target.value })}
-                placeholder="sk-..."
-                className="bg-slate-800 border-slate-700 text-slate-100 mt-1"
-              />
-            </div>
-            <div>
-              <Label className="text-slate-300">API Endpoint</Label>
-              <Input
-                value={config.endpoint}
-                onChange={(e) => setConfig({ ...config, endpoint: e.target.value })}
-                placeholder="https://api.openai.com/v1"
-                className="bg-slate-800 border-slate-700 text-slate-100 mt-1 font-mono text-sm"
-              />
-              <p className="text-xs text-slate-500 mt-1">基础地址（不含 /chat/completions），OpenAI 兼容格式</p>
-            </div>
-            <div>
-              <Label className="text-slate-300">系统提示词（可选）</Label>
-              <textarea
-                value={config.system_prompt}
-                onChange={(e) => setConfig({ ...config, system_prompt: e.target.value })}
-                placeholder="留空则使用内置 AIOps 运维助手角色提示词"
-                className="w-full bg-slate-800 border border-slate-700 text-slate-100 mt-1 rounded-md p-2 text-sm min-h-[70px] resize-y"
-              />
-            </div>
-            <div className="grid grid-cols-2 gap-4">
-              <div>
-                <Label className="text-slate-300">Temperature</Label>
-                <Input
-                  type="number"
-                  min={0}
-                  max={2}
-                  step={0.1}
-                  value={Math.round(config.temperature * 10) / 10}
-                  onChange={(e) => setConfig({ ...config, temperature: parseFloat(e.target.value) || 0 })}
-                  className="bg-slate-800 border-slate-700 text-slate-100 mt-1"
-                />
-                <p className="text-xs text-slate-500 mt-1">值越高回答越创造性</p>
-              </div>
-              <div>
-                <Label className="text-slate-300">Max Tokens</Label>
-                <Input
-                  type="number"
-                  value={config.max_tokens}
-                  onChange={(e) => setConfig({ ...config, max_tokens: parseInt(e.target.value) || 2000 })}
-                  className="bg-slate-800 border-slate-700 text-slate-100 mt-1"
-                />
-              </div>
-            </div>
-          </div>
-          <DialogFooter className="gap-2">
-            <Button variant="outline" onClick={handleTest} disabled={testing} className="border-slate-700 text-slate-300">
-              {testing ? <Loader2 className="h-4 w-4 mr-2 animate-spin" /> : <Wifi className="h-4 w-4 mr-2" />}
-              测试连接
-            </Button>
-            <Button variant="outline" onClick={() => setIsConfigOpen(false)} className="border-slate-700 text-slate-300">
-              取消
-            </Button>
-            <Button className="bg-purple-600 hover:bg-purple-700" onClick={handleSaveConfig} disabled={saving}>
-              {saving ? <Loader2 className="h-4 w-4 mr-2 animate-spin" /> : null}
-              保存配置
-            </Button>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
     </div>
   );
-}
+}
\ No newline at end of file
diff --git a/frontend/src/components/approval/helpers.tsx b/frontend/src/components/approval/helpers.tsx
index 1f17ed1..73517a9 100644
--- a/frontend/src/components/approval/helpers.tsx
+++ b/frontend/src/components/approval/helpers.tsx
@@ -117,6 +117,16 @@ export function renderStepProgress(instance: JsonData) {
               {isRejected && <XCircle className="h-3 w-3" />}
               {isCurrent && !isRejected && <Loader2 className="h-3 w-3 animate-spin" />}
               <span>{step.name || step.approver_name || `步骤 ${index + 1}`}</span>
+              {step.step_type && step.step_type !== 'submit' && (
+                <span className={cn(
+                  'text-[10px] px-1 py-0 rounded',
+                  step.step_type === 'execute' 
+                    ? 'bg-green-500/15 text-green-400' 
+                    : 'bg-purple-500/15 text-purple-400'
+                )}>
+                  {step.step_type === 'execute' ? '执行' : '审核'}
+                </span>
+              )}
             </div>
             {index < steps.length - 1 && (
               <div className={cn('w-4 h-px', isCompleted ? 'bg-emerald-500/30' : 'bg-[var(--dg-border)]')} />
diff --git a/frontend/src/components/monitor/log-center/UnifiedQueryPanel.tsx b/frontend/src/components/monitor/log-center/UnifiedQueryPanel.tsx
index 92df852..609ddeb 100644
--- a/frontend/src/components/monitor/log-center/UnifiedQueryPanel.tsx
+++ b/frontend/src/components/monitor/log-center/UnifiedQueryPanel.tsx
@@ -166,6 +166,7 @@ export function UnifiedQueryPanel({ engine, onRuleCreated }: Props) {
   const [historyPanelOpen, setHistoryPanelOpen] = useState(false);
   const [alertDialogOpen, setAlertDialogOpen] = useState(false);
   const [saveMenuOpen, setSaveMenuOpen] = useState(false);
+  const [hasQueried, setHasQueried] = useState(false);
 
   // 数据源切换后更新 dsId // Logan.Li
   useEffect(() => {
@@ -194,7 +195,7 @@ export function UnifiedQueryPanel({ engine, onRuleCreated }: Props) {
         const mock = generateMockEntries(effEngine as LogEngine, 120);
         setEntries(mock); setHistogramData(generateHistogramData(mock)); setTotalCount(mock.length * 14);
         setQueryTime(Math.round(performance.now() - t0)); setStatTable(generateMockStatTable(effEngine as LogEngine));
-        setClusters(generateMockClusters()); setPage(1); setLoading(false);
+        setClusters(generateMockClusters()); setPage(1); setLoading(false); setHasQueried(true);
         historyStorage.add({ engine: effEngine as LogEngine, datasourceName: currentSource.name, query, timeRange: timeRange.label, resultCount: mock.length });
       }, 300);
       return;
@@ -243,10 +244,11 @@ export function UnifiedQueryPanel({ engine, onRuleCreated }: Props) {
       setStatTable(generateMockStatTable(effEngine as LogEngine));
       setClusters(generateMockClusters());
       setPage(1);
+      setHasQueried(true);
       historyStorage.add({ engine: effEngine as LogEngine, datasourceName: currentSource.name, query, timeRange: timeRange.label, resultCount: mapped.length });
     } catch (e: any) {
       toast({ title: '查询失败', description: e?.message || String(e), variant: 'destructive' });
-      setEntries([]); setTotalCount(0);
+      setEntries([]); setTotalCount(0); setHasQueried(true);
     } finally {
       setLoading(false);
     }
@@ -373,13 +375,31 @@ export function UnifiedQueryPanel({ engine, onRuleCreated }: Props) {
         </div>
       )}
 
-      {/* 空状态 */}
-      {!loading && entries.length === 0 && (
+      {/* 空状态：从未查询 vs 查询返回 0 结果 */}
+      {!loading && entries.length === 0 && !hasQueried && (
         <div className="border rounded-lg flex flex-col items-center justify-center gap-2" style={{ borderColor: 'var(--dg-border)', minHeight: '300px' }}>
           <span className="text-sm" style={{ color: 'var(--dg-text-muted)' }}>输入查询语句并点击「查询」查看结果</span>
           <span className="text-xs font-mono px-3 py-1 rounded" style={{ color: 'var(--dg-text-muted)', background: 'var(--dg-bg-tertiary)' }}>{meta.queryPlaceholder}</span>
         </div>
       )}
+      {!loading && entries.length === 0 && hasQueried && (
+        <div className="border rounded-lg flex flex-col items-center justify-center gap-3" style={{ borderColor: 'var(--dg-border)', minHeight: '300px' }}>
+          <div className="w-12 h-12 rounded-full flex items-center justify-center" style={{ background: 'var(--dg-bg-tertiary)' }}>
+            <svg className="h-6 w-6" style={{ color: 'var(--dg-text-muted)' }} fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
+              <path strokeLinecap="round" strokeLinejoin="round" d="M21 21l-5.197-5.197m0 0A7.5 7.5 0 105.196 5.196a7.5 7.5 0 0010.607 10.607z" />
+            </svg>
+          </div>
+          <div className="text-center">
+            <p className="text-sm font-medium" style={{ color: 'var(--dg-text-primary)' }}>未找到匹配的日志记录</p>
+            <p className="text-xs mt-1" style={{ color: 'var(--dg-text-muted)' }}>
+              查询已执行（{queryTime}ms），但当前时间范围和筛选条件下无匹配结果
+            </p>
+          </div>
+          <button onClick={handleRun} className="px-4 py-1.5 rounded text-xs font-medium text-white transition-opacity hover:opacity-90" style={{ background: '#22c55e' }}>
+            <Play className="h-3.5 w-3.5 inline mr-1" />重新查询
+          </button>
+        </div>
+      )}
 
       {/* Loading */}
       {loading && entries.length === 0 && (