diff --git a/docs/project_context.md b/docs/project_context.md
index 34e3f59..761eb52 100644
--- a/docs/project_context.md
+++ b/docs/project_context.md
@@ -1,5 +1,12 @@
 # 项目上下文记录
 
+## 2026-05-19：修复数据管理表格滚动和字段结构收起
+
+- `frontend/src/components/DatabasePanel.vue` 为数据表增加明确的 `scroll-x` 宽度和底部外置横向滚动条，滚动条会与 Naive UI 表格内部横向滚动位置双向同步，避免字段结构区域或分页区域遮挡表格底部横向滚动入口。
+- 字段结构区域从默认 `n-collapse` 改为受控折叠头，展开后标题显示“收起字段结构”，再次点击恢复“字段结构”，并使用本地图标箭头表示展开状态。
+- 字段结构明细使用内部滚动容器限制高度，数据表主体保持 flex 占位，避免展开字段结构后挤掉分页或整页出现不必要滚动。
+- 已执行 `npm run build`；已通过本机 Chrome DevTools 验证 `/database` 中表格横向滚动条可见且与表格滚动同步，字段结构展开/收起文案正常切换。
+
 ## 2026-05-19：压缩系统设置页布局高度
 
 - `frontend/src/styles.css` 调整系统设置页为固定高度布局，外层 `settings-workspace` 减小 padding 并隐藏溢出，避免主内容区出现整页滚动条。
diff --git a/frontend/src/components/DatabasePanel.vue b/frontend/src/components/DatabasePanel.vue
index 96d3a5c..8e33acf 100644
--- a/frontend/src/components/DatabasePanel.vue
+++ b/frontend/src/components/DatabasePanel.vue
@@ -98,19 +98,37 @@
       <div class="database-data-body" :class="{ empty: !selectedTable }">
         <n-empty v-if="!selectedTable" description="请选择左侧的数据表" />
         <template v-else>
-          <n-data-table
-            size="small"
-            class="database-data-table"
-            :columns="columns"
-            :data="rows"
-            :loading="loadingData"
-            :bordered="false"
-            :single-line="false"
-            flex-height
-          />
+          <div ref="dataTableWrapperRef" class="database-data-table-wrap">
+            <n-data-table
+              size="small"
+              class="database-data-table"
+              :columns="columns"
+              :data="rows"
+              :loading="loadingData"
+              :bordered="false"
+              :single-line="false"
+              :scroll-x="dataTableScrollX"
+              flex-height
+            />
+          </div>
+          <div
+            v-if="hasDataColumns"
+            ref="horizontalScrollRef"
+            class="database-horizontal-scrollbar"
+            aria-label="数据表横向滚动条"
+            @scroll="syncTableScrollFromBar"
+          >
+            <div class="database-horizontal-scrollbar-inner" :style="{ width: `${dataTableScrollX}px` }"></div>
+          </div>
 
-          <n-collapse v-if="tableInfo" class="columns-collapse">
-            <n-collapse-item title="字段结构" name="columns">
+          <section v-if="tableInfo" class="columns-collapse">
+            <button type="button" class="columns-collapse-header" @click="toggleColumnSchema">
+              <n-icon class="columns-collapse-icon" :class="{ expanded: columnSchemaExpanded }">
+                <ChevronForwardOutline />
+              </n-icon>
+              <span>{{ columnSchemaExpanded ? '收起字段结构' : '字段结构' }}</span>
+            </button>
+            <div v-if="columnSchemaExpanded" class="columns-schema-scroll">
               <n-table size="small" :bordered="false">
                 <thead>
                   <tr>
@@ -133,8 +151,8 @@
                   </tr>
                 </tbody>
               </n-table>
-            </n-collapse-item>
-          </n-collapse>
+            </div>
+          </section>
         </template>
       </div>
 
@@ -155,11 +173,17 @@
 </template>
 
 <script setup lang="ts">
-import { computed, onActivated, onBeforeUnmount, onMounted, ref } from 'vue';
+import { computed, nextTick, onActivated, onBeforeUnmount, onMounted, ref, watch } from 'vue';
 import { onBeforeRouteLeave } from 'vue-router';
 import { useDialog, useMessage } from 'naive-ui';
 import type { DataTableColumns, DropdownOption } from 'naive-ui';
-import { ChevronDownOutline, CloudDownloadOutline, RefreshOutline, TrashOutline } from '@vicons/ionicons5';
+import {
+  ChevronDownOutline,
+  ChevronForwardOutline,
+  CloudDownloadOutline,
+  RefreshOutline,
+  TrashOutline
+} from '@vicons/ionicons5';
 
 import { apiGet, apiPost, download } from '../api/client';
 import type { ApiMessage, DatabaseInfo, TableData, TableInfo } from '../types';
@@ -168,6 +192,7 @@ import { resetPageHeader, setPageHeader } from '../composables/pageHeader';
 type RowData = Record<string, unknown>;
 type DownloadFormat = 'csv' | 'xlsx';
 
+const COLUMN_MIN_WIDTH = 140;
 const message = useMessage();
 const dialog = useDialog();
 const databaseInfo = ref<DatabaseInfo | null>(null);
@@ -182,7 +207,12 @@ const loadingTables = ref(false);
 const loadingData = ref(false);
 const testing = ref(false);
 const downloadingFormat = ref<DownloadFormat | null>(null);
+const dataTableWrapperRef = ref<HTMLElement | null>(null);
+const horizontalScrollRef = ref<HTMLElement | null>(null);
+const columnSchemaExpanded = ref(false);
 let tableLoadToken = 0;
+let removeTableScrollListener: (() => void) | null = null;
+let syncingHorizontalScroll = false;
 
 const totalPages = computed(() => Math.max(1, Math.ceil(total.value / pageSize.value)));
 const downloading = computed(() => Boolean(downloadingFormat.value));
@@ -201,20 +231,29 @@ const loadDataInfileClass = computed(() => {
   if (testing.value || !databaseInfo.value) return 'unknown';
   return databaseInfo.value.load_data_infile ? 'success' : 'warning';
 });
-const columns = computed<DataTableColumns<RowData>>(() => {
-  const keys = rows.value.length
+const columnKeys = computed(() => (
+  rows.value.length
     ? Object.keys(rows.value[0])
-    : tableInfo.value?.columns.map(column => String(column.Field || '')).filter(Boolean) || [];
+    : tableInfo.value?.columns.map(column => String(column.Field || '')).filter(Boolean) || []
+));
+const hasDataColumns = computed(() => columnKeys.value.length > 0);
+const dataTableScrollX = computed(() => Math.max(columnKeys.value.length * COLUMN_MIN_WIDTH, COLUMN_MIN_WIDTH));
+const columns = computed<DataTableColumns<RowData>>(() => {
+  const keys = columnKeys.value;
 
   return keys.map(key => ({
     title: key,
     key,
-    minWidth: 120,
+    minWidth: COLUMN_MIN_WIDTH,
     ellipsis: { tooltip: true },
     render: row => formatCell(row[key])
   }));
 });
 
+watch([dataTableScrollX, rows, tableInfo], () => {
+  void refreshHorizontalScrollBinding();
+}, { flush: 'post' });
+
 onMounted(() => {
   setPageHeader({
     actions: [
@@ -242,6 +281,7 @@ onBeforeRouteLeave(() => {
 });
 
 onBeforeUnmount(() => {
+  removeHorizontalScrollListener();
   resetPageHeader();
 });
 
@@ -274,6 +314,8 @@ async function loadTables() {
       tableInfo.value = null;
       rows.value = [];
       total.value = 0;
+      columnSchemaExpanded.value = false;
+      removeHorizontalScrollListener();
     }
   } catch (error) {
     if (currentToken !== tableLoadToken) return;
@@ -293,13 +335,16 @@ function resetTableState() {
   rows.value = [];
   total.value = 0;
   page.value = 1;
+  columnSchemaExpanded.value = false;
   loadingTables.value = false;
   loadingData.value = false;
+  removeHorizontalScrollListener();
 }
 
 async function loadTable(table: string) {
   selectedTable.value = table;
   page.value = 1;
+  columnSchemaExpanded.value = false;
   await Promise.all([loadTableInfo(table), loadTableData()]);
 }
 
@@ -331,9 +376,68 @@ async function loadTableData() {
     message.error(error instanceof Error ? error.message : '加载表数据失败');
   } finally {
     loadingData.value = false;
+    void refreshHorizontalScrollBinding();
   }
 }
 
+function toggleColumnSchema() {
+  columnSchemaExpanded.value = !columnSchemaExpanded.value;
+  void refreshHorizontalScrollBinding();
+}
+
+function findTableScrollContainer(): HTMLElement | null {
+  const wrapper = dataTableWrapperRef.value;
+  if (!wrapper) return null;
+
+  const candidates = Array.from(
+    wrapper.querySelectorAll<HTMLElement>('.n-scrollbar-container, .n-data-table-base-table-body, .n-data-table-base-table-header')
+  );
+  return candidates.find(element => element.scrollWidth > element.clientWidth + 1) || null;
+}
+
+function removeHorizontalScrollListener() {
+  removeTableScrollListener?.();
+  removeTableScrollListener = null;
+}
+
+async function refreshHorizontalScrollBinding() {
+  await nextTick();
+  removeHorizontalScrollListener();
+
+  const tableScroller = findTableScrollContainer();
+  const horizontalScroller = horizontalScrollRef.value;
+  if (!tableScroller || !horizontalScroller) return;
+
+  horizontalScroller.scrollLeft = tableScroller.scrollLeft;
+  const handleTableScroll = () => {
+    if (syncingHorizontalScroll) return;
+    syncingHorizontalScroll = true;
+    horizontalScroller.scrollLeft = tableScroller.scrollLeft;
+    requestAnimationFrame(() => {
+      syncingHorizontalScroll = false;
+    });
+  };
+
+  tableScroller.addEventListener('scroll', handleTableScroll, { passive: true });
+  removeTableScrollListener = () => {
+    tableScroller.removeEventListener('scroll', handleTableScroll);
+  };
+}
+
+function syncTableScrollFromBar() {
+  if (syncingHorizontalScroll) return;
+
+  const tableScroller = findTableScrollContainer();
+  const horizontalScroller = horizontalScrollRef.value;
+  if (!tableScroller || !horizontalScroller) return;
+
+  syncingHorizontalScroll = true;
+  tableScroller.scrollLeft = horizontalScroller.scrollLeft;
+  requestAnimationFrame(() => {
+    syncingHorizontalScroll = false;
+  });
+}
+
 function changePage(value: number) {
   page.value = value;
   void loadTableData();
@@ -401,6 +505,8 @@ async function dropTable() {
     tableInfo.value = null;
     rows.value = [];
     total.value = 0;
+    columnSchemaExpanded.value = false;
+    removeHorizontalScrollListener();
     await loadTables();
   } catch (error) {
     message.error(error instanceof Error ? error.message : '删除失败');
@@ -426,6 +532,8 @@ async function dropAllTables() {
     tableInfo.value = null;
     rows.value = [];
     total.value = 0;
+    columnSchemaExpanded.value = false;
+    removeHorizontalScrollListener();
     await loadTables();
   } catch (error) {
     message.error(error instanceof Error ? error.message : '删除全部数据表失败');
@@ -693,7 +801,7 @@ function formatCell(value: unknown): string {
   display: flex;
   flex: 1;
   min-height: 0;
-  overflow: auto;
+  overflow: hidden;
   flex-direction: column;
 }
 
@@ -702,17 +810,122 @@ function formatCell(value: unknown): string {
   justify-content: center;
 }
 
-.database-data-table {
-  flex: 1;
+.database-data-table-wrap {
+  display: flex;
+  flex: 1 1 0;
+  min-width: 0;
   min-height: 0;
 }
 
+.database-data-table {
+  flex: 1 1 0;
+  min-width: 0;
+  min-height: 0;
+}
+
+.database-horizontal-scrollbar {
+  height: 14px;
+  flex: 0 0 14px;
+  overflow-x: auto;
+  overflow-y: hidden;
+  background: var(--td-bg-color-container);
+  border-top: 1px solid var(--td-border-color-light);
+  scrollbar-color: var(--td-scrollbar-color) transparent;
+  scrollbar-width: thin;
+}
+
+.database-horizontal-scrollbar::-webkit-scrollbar {
+  height: 10px;
+}
+
+.database-horizontal-scrollbar::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.database-horizontal-scrollbar::-webkit-scrollbar-thumb {
+  background: var(--td-scrollbar-color);
+  border-radius: 8px;
+}
+
+.database-horizontal-scrollbar::-webkit-scrollbar-thumb:hover {
+  background: var(--td-text-color-placeholder);
+}
+
+.database-horizontal-scrollbar-inner {
+  height: 1px;
+}
+
 .columns-collapse {
   flex: 0 0 auto;
-  padding: 0 14px 12px;
+  max-height: 40%;
+  overflow: hidden;
   border-top: 1px solid var(--td-border-color-light);
 }
 
+.columns-collapse-header {
+  display: flex;
+  width: 100%;
+  min-height: 36px;
+  align-items: center;
+  gap: 8px;
+  padding: 0 14px;
+  color: var(--td-text-color-primary);
+  font: inherit;
+  font-size: 13px;
+  font-weight: 500;
+  text-align: left;
+  background: var(--td-bg-color-container);
+  border: 0;
+  cursor: pointer;
+  transition: background-color var(--td-transition), color var(--td-transition);
+}
+
+.columns-collapse-header:hover {
+  color: var(--td-brand-color);
+  background: var(--td-bg-color-container-hover);
+}
+
+.columns-collapse-icon {
+  flex: 0 0 auto;
+  color: var(--td-text-color-secondary);
+  font-size: 15px;
+  transition: transform var(--td-transition), color var(--td-transition);
+}
+
+.columns-collapse-header:hover .columns-collapse-icon {
+  color: var(--td-brand-color);
+}
+
+.columns-collapse-icon.expanded {
+  transform: rotate(90deg);
+}
+
+.columns-schema-scroll {
+  max-height: min(360px, 36vh);
+  overflow: auto;
+  padding: 0 14px 12px;
+  scrollbar-color: var(--td-scrollbar-color) transparent;
+  scrollbar-width: thin;
+}
+
+.columns-schema-scroll::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+.columns-schema-scroll::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.columns-schema-scroll::-webkit-scrollbar-thumb {
+  background: var(--td-scrollbar-color);
+  border-radius: 8px;
+}
+
+.columns-schema-scroll::-webkit-scrollbar-thumb:hover {
+  background: var(--td-text-color-placeholder);
+}
+
 .database-pagination {
   display: flex;
   align-items: center;