diff --git a/apps/desktop/src/components/editor/EditorSettingsDialog.vue b/apps/desktop/src/components/editor/EditorSettingsDialog.vue
index e1ec1b8b1..45a19d8c6 100644
--- a/apps/desktop/src/components/editor/EditorSettingsDialog.vue
+++ b/apps/desktop/src/components/editor/EditorSettingsDialog.vue
@@ -39,6 +39,7 @@ import {
   type InterfaceLayout,
   type DisconnectTabHandlingMode,
   type OpenTabsRestoreMode,
+  type SidebarObjectInfoMode,
   type SqlSemanticDiagnosticsMode,
   type UpdateDownloadSource,
   type CustomThemeColors,
@@ -356,7 +357,7 @@ const editReuseDataTab = ref(settingsStore.editorSettings.reuseDataTab);
 const editPrefillNewQueryWithSelect = ref(settingsStore.editorSettings.prefillNewQueryWithSelect);
 const editUpdateNotificationsEnabled = ref(settingsStore.editorSettings.updateNotificationsEnabled);
 const editSidebarHiddenTablePrefixes = ref(settingsStore.editorSettings.sidebarHiddenTablePrefixes.join("\n"));
-const editSidebarHideTableComments = ref(settingsStore.editorSettings.sidebarHideTableComments);
+const editSidebarObjectInfoMode = ref<SidebarObjectInfoMode>(settingsStore.editorSettings.sidebarObjectInfoMode);
 const editSidebarAllowHorizontalScroll = ref(settingsStore.editorSettings.sidebarAllowHorizontalScroll);
 const editExportBatchSize = ref(settingsStore.editorSettings.exportBatchSize);
 const editGlobalDateTimeDisplayFormat = ref(settingsStore.editorSettings.globalDateTimeDisplayFormat);
@@ -456,7 +457,7 @@ function currentEditorSettingsDraft(): EditorSettingsDraft {
     reuseDataTab: editReuseDataTab.value,
     prefillNewQueryWithSelect: editPrefillNewQueryWithSelect.value,
     updateNotificationsEnabled: editUpdateNotificationsEnabled.value,
-    sidebarHideTableComments: editSidebarHideTableComments.value,
+    sidebarObjectInfoMode: editSidebarObjectInfoMode.value,
     sidebarAllowHorizontalScroll: editSidebarAllowHorizontalScroll.value,
     sidebarHiddenTablePrefixes: normalizeSidebarHiddenTablePrefixes(editSidebarHiddenTablePrefixes.value),
     exportBatchSize: editExportBatchSize.value,
@@ -709,7 +710,7 @@ function syncEditorSettingsDraftFromStore() {
   editPrefillNewQueryWithSelect.value = settingsStore.editorSettings.prefillNewQueryWithSelect;
   editUpdateNotificationsEnabled.value = settingsStore.editorSettings.updateNotificationsEnabled;
   editSidebarHiddenTablePrefixes.value = settingsStore.editorSettings.sidebarHiddenTablePrefixes.join("\n");
-  editSidebarHideTableComments.value = settingsStore.editorSettings.sidebarHideTableComments;
+  editSidebarObjectInfoMode.value = settingsStore.editorSettings.sidebarObjectInfoMode;
   editSidebarAllowHorizontalScroll.value = settingsStore.editorSettings.sidebarAllowHorizontalScroll;
   editExportBatchSize.value = settingsStore.editorSettings.exportBatchSize;
   editGlobalDateTimeDisplayFormat.value = settingsStore.editorSettings.globalDateTimeDisplayFormat;
@@ -817,6 +818,7 @@ async function persistSettings() {
   const sidebarTablePageSizeChanged = editSidebarTablePageSize.value !== (settingsStore.desktopSettings.sidebar_table_page_size ?? DEFAULT_SIDEBAR_TABLE_PAGE_SIZE);
   if (Object.keys(editorSettingsPatch).length > 0) {
     settingsStore.updateEditorSettings(editorSettingsPatch);
+    await settingsStore.persistEditorSettings();
     editEditorSettingsBase.value = editorSettingsDraftFromSettings(settingsStore.editorSettings);
   }
   await settingsStore.updateDesktopSettings({
@@ -907,7 +909,7 @@ function resetDefaultsForTab(tab: SettingsCategory) {
     editReuseDataTab.value = DEFAULT_EDITOR_SETTINGS.reuseDataTab;
     editPrefillNewQueryWithSelect.value = DEFAULT_EDITOR_SETTINGS.prefillNewQueryWithSelect;
     editUpdateNotificationsEnabled.value = DEFAULT_EDITOR_SETTINGS.updateNotificationsEnabled;
-    editSidebarHideTableComments.value = DEFAULT_EDITOR_SETTINGS.sidebarHideTableComments;
+    editSidebarObjectInfoMode.value = DEFAULT_EDITOR_SETTINGS.sidebarObjectInfoMode;
     editSidebarAllowHorizontalScroll.value = DEFAULT_EDITOR_SETTINGS.sidebarAllowHorizontalScroll;
     editSidebarHiddenTablePrefixes.value = DEFAULT_EDITOR_SETTINGS.sidebarHiddenTablePrefixes.join("\n");
     editToolbarItems.value = { ...DEFAULT_EDITOR_SETTINGS.toolbarItems };
@@ -992,7 +994,7 @@ function resetAllDefaults() {
   editReuseDataTab.value = DEFAULT_EDITOR_SETTINGS.reuseDataTab;
   editPrefillNewQueryWithSelect.value = DEFAULT_EDITOR_SETTINGS.prefillNewQueryWithSelect;
   editUpdateNotificationsEnabled.value = DEFAULT_EDITOR_SETTINGS.updateNotificationsEnabled;
-  editSidebarHideTableComments.value = DEFAULT_EDITOR_SETTINGS.sidebarHideTableComments;
+  editSidebarObjectInfoMode.value = DEFAULT_EDITOR_SETTINGS.sidebarObjectInfoMode;
   editSidebarAllowHorizontalScroll.value = DEFAULT_EDITOR_SETTINGS.sidebarAllowHorizontalScroll;
   editSidebarHiddenTablePrefixes.value = DEFAULT_EDITOR_SETTINGS.sidebarHiddenTablePrefixes.join("\n");
   editExportBatchSize.value = DEFAULT_EDITOR_SETTINGS.exportBatchSize;
@@ -4002,14 +4004,24 @@ onUnmounted(cleanupPreviewEditor);
                   {{ t(`settings.${disconnectTabHandlingModeDescriptionKey}`) }}
                 </p>
               </div>
-              <div class="flex items-center justify-between gap-4 rounded-md border bg-muted/20 px-3 py-2">
+              <div class="space-y-2 rounded-md border bg-muted/20 px-3 py-2">
                 <div class="flex items-center gap-2">
-                  <Label for="sidebar-hide-table-comments">{{ t("settings.sidebarHideTableComments") }}</Label>
-                  <HelpTooltip :label="t('settings.sidebarHideTableComments')">
-                    {{ t("settings.sidebarHideTableCommentsDescription") }}
+                  <Label for="sidebar-object-info-mode">{{ t("settings.sidebarObjectInfoMode") }}</Label>
+                  <HelpTooltip :label="t('settings.sidebarObjectInfoMode')">
+                    {{ t("settings.sidebarObjectInfoModeDescription") }}
                   </HelpTooltip>
                 </div>
-                <Switch id="sidebar-hide-table-comments" v-model="editSidebarHideTableComments" />
+                <Select :model-value="editSidebarObjectInfoMode" @update:model-value="(value) => (editSidebarObjectInfoMode = value as SidebarObjectInfoMode)">
+                  <SelectTrigger id="sidebar-object-info-mode" class="w-full">
+                    <SelectValue />
+                  </SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value="comment-aligned">{{ t("settings.sidebarObjectInfoModeCommentAligned") }}</SelectItem>
+                    <SelectItem value="comment-inline">{{ t("settings.sidebarObjectInfoModeCommentInline") }}</SelectItem>
+                    <SelectItem value="size">{{ t("settings.sidebarObjectInfoModeSize") }}</SelectItem>
+                    <SelectItem value="hidden">{{ t("settings.sidebarObjectInfoModeHidden") }}</SelectItem>
+                  </SelectContent>
+                </Select>
               </div>
               <div class="flex items-center justify-between gap-4 rounded-md border bg-muted/20 px-3 py-2">
                 <div class="flex items-center gap-2">
diff --git a/apps/desktop/src/components/sidebar/ConnectionTree.vue b/apps/desktop/src/components/sidebar/ConnectionTree.vue
index 1e6e6e60b..7ea976ae5 100644
--- a/apps/desktop/src/components/sidebar/ConnectionTree.vue
+++ b/apps/desktop/src/components/sidebar/ConnectionTree.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, computed, nextTick, watch, provide, onMounted, onUnmounted, type Component, type ComponentPublicInstance, type CSSProperties } from "vue";
+import { ref, shallowRef, computed, nextTick, watch, provide, onMounted, onUnmounted, type Component, type ComponentPublicInstance, type CSSProperties } from "vue";
 import { useI18n } from "vue-i18n";
 import { Search, X, ListFilter, ListOrdered, ArrowDownAZ, ArrowUpZA, Crosshair, Server, Database, FolderTree, Table2, Eye, RotateCcw } from "@lucide/vue";
 import { useConnectionStore } from "@/stores/connectionStore";
@@ -38,6 +38,9 @@ import type { SidebarDangerDialogRequest } from "@/lib/sidebar/sidebarDangerDial
 import { resetSidebarTreeDialogState } from "./sidebarTreeDialogState";
 import { SidebarDangerConfirmDialog, SidebarDdlViewDialog, SidebarObjectSourceDialog, SidebarProcedureExecutionDialog, SidebarVisibleDatabasesDialog, SidebarVisibleSchemasDialog } from "./sidebarAsyncDialogs";
 import { sortConnectionListForDisplay } from "@/lib/sidebar/connectionListSort";
+import { sidebarDisplayTableName } from "@/lib/sidebar/sidebarTableNameDisplay";
+import { alignedSidebarCommentLabelWidths, isSidebarCommentAlignableNode, sidebarTreeNodeComment } from "@/lib/sidebar/sidebarTreeItemLayout";
+import { sidebarTableStorageScopes, supportsSidebarTableStorage } from "@/lib/sidebar/sidebarDatabaseStorage";
 
 const { t } = useI18n();
 const store = useConnectionStore();
@@ -357,6 +360,64 @@ const flatNodes = computed<FlatTreeNode[]>(() =>
     activeQueries: store.sidebarTableSearchQueries,
   }),
 );
+
+const sidebarCommentLabelWidths = shallowRef(new Map<string, number>());
+let sidebarCommentMeasureFrame = 0;
+const sidebarTableNameDisplayTypes = new Set<TreeNodeType>(["table", "view", "materialized_view", "mongo-collection", "vector-collection", "elasticsearch-index"]);
+
+function sidebarCommentLabel(node: TreeNode): string {
+  const label = sidebarTableNameDisplayTypes.has(node.type) ? sidebarDisplayTableName(node.label, settingsStore.editorSettings.sidebarHiddenTablePrefixes) : node.label;
+  return node.valid === false ? `${label} · INVALID` : label;
+}
+
+function measureSidebarCommentLabelWidths() {
+  sidebarCommentMeasureFrame = 0;
+  if (settingsStore.editorSettings.sidebarObjectInfoMode !== "comment-aligned" || typeof document === "undefined" || !rootRef.value) {
+    sidebarCommentLabelWidths.value = new Map();
+    return;
+  }
+
+  const context = document.createElement("canvas").getContext("2d");
+  if (!context) return;
+  const style = window.getComputedStyle(rootRef.value);
+  context.font = style.font || `${style.fontWeight} ${style.fontSize} ${style.fontFamily}`;
+  sidebarCommentLabelWidths.value = alignedSidebarCommentLabelWidths(
+    flatNodes.value.map(({ id, depth, node }) => ({
+      id,
+      depth,
+      alignable: isSidebarCommentAlignableNode(node),
+      hasComment: !!sidebarTreeNodeComment(node),
+      labelWidth: context.measureText(sidebarCommentLabel(node)).width,
+    })),
+  );
+}
+
+function scheduleSidebarCommentLabelMeasure() {
+  if (typeof window === "undefined") {
+    measureSidebarCommentLabelWidths();
+    return;
+  }
+  if (sidebarCommentMeasureFrame) window.cancelAnimationFrame(sidebarCommentMeasureFrame);
+  sidebarCommentMeasureFrame = window.requestAnimationFrame(measureSidebarCommentLabelWidths);
+}
+
+watch([flatNodes, () => settingsStore.editorSettings.sidebarObjectInfoMode, () => settingsStore.editorSettings.sidebarHiddenTablePrefixes, () => settingsStore.editorSettings.uiFontFamily, () => settingsStore.editorSettings.uiScale], scheduleSidebarCommentLabelMeasure, {
+  flush: "post",
+  immediate: true,
+});
+
+const visibleSidebarTableStorageScopes = computed(() => {
+  if (settingsStore.editorSettings.sidebarObjectInfoMode !== "size") return [];
+  return sidebarTableStorageScopes(flatNodes.value.map(({ node }) => node)).filter((scope) => supportsSidebarTableStorage(store.getConfig(scope.connectionId)));
+});
+
+watch(
+  visibleSidebarTableStorageScopes,
+  (scopes) => {
+    for (const scope of scopes) void store.loadSidebarTableStorage(scope);
+  },
+  { flush: "post", immediate: true },
+);
 // Build all lookup tables in one linear pass whenever the visible tree changes.
 // Selection, scrolling and sticky headers then avoid repeated full-array scans.
 const flatTreeIndex = computed(() =>
@@ -1306,6 +1367,7 @@ onUnmounted(() => {
   sidebarScrollbarResizeObserver?.disconnect();
   window.cancelAnimationFrame(sidebarScrollbarAnimationFrame);
   window.clearTimeout(sidebarScrollingTimer);
+  if (sidebarCommentMeasureFrame) window.cancelAnimationFrame(sidebarCommentMeasureFrame);
 });
 
 defineExpose({ focusSearch, createNewGroup, collapseAllTreeNodes });
@@ -1413,6 +1475,7 @@ defineExpose({ focusSearch, createNewGroup, collapseAllTreeNodes });
               :drag-disabled="isFiltering || isConnectionListAlphabeticallySorted"
               :pending-rename="pendingRenameGroupId === item.node.id"
               :highlighted="highlightedNodeId === item.node.id"
+              :comment-label-width="sidebarCommentLabelWidths.get(item.node.id)"
               @context-menu="(event, node) => openSidebarContextMenu(event, node, contextMenuSlot.onContextMenu)"
               @rename-started="pendingRenameGroupId = null"
               @group-created="startRenamingCreatedGroup"
@@ -1420,7 +1483,7 @@ defineExpose({ focusSearch, createNewGroup, collapseAllTreeNodes });
           </template>
         </RecycleScroller>
         <div v-if="stickyNode" class="sticky-database-header pointer-events-auto absolute inset-x-0 top-0 z-[5] border-b border-border/60" :style="stickyHeaderStyle">
-          <TreeItem :node="stickyNode.node" :depth="stickyNode.depth" :drag-disabled="true" @context-menu="(event, node) => openSidebarContextMenu(event, node, contextMenuSlot.onContextMenu)" />
+          <TreeItem :node="stickyNode.node" :depth="stickyNode.depth" :drag-disabled="true" :comment-label-width="sidebarCommentLabelWidths.get(stickyNode.node.id)" @context-menu="(event, node) => openSidebarContextMenu(event, node, contextMenuSlot.onContextMenu)" />
         </div>
         <div v-if="hasSidebarVerticalOverflow" ref="sidebarScrollbarTrackRef" class="sidebar-tree-scrollbar" :class="{ 'sidebar-tree-scrollbar--scrolling': isScrollingSidebar, 'sidebar-tree-scrollbar--dragging': isDraggingSidebarScrollbar }" @pointerdown="onSidebarScrollbarTrackPointerDown">
           <div class="sidebar-tree-scrollbar__thumb" :style="sidebarScrollbarThumbStyle" @pointerdown.stop="onSidebarScrollbarThumbPointerDown" />
@@ -1436,6 +1499,7 @@ defineExpose({ focusSearch, createNewGroup, collapseAllTreeNodes });
             :drag-disabled="isFiltering || isConnectionListAlphabeticallySorted"
             :pending-rename="pendingRenameGroupId === item.node.id"
             :highlighted="highlightedNodeId === item.id"
+            :comment-label-width="sidebarCommentLabelWidths.get(item.node.id)"
             @context-menu="(event, node) => openSidebarContextMenu(event, node, contextMenuSlot.onContextMenu)"
             @rename-started="pendingRenameGroupId = null"
             @group-created="startRenamingCreatedGroup"
diff --git a/apps/desktop/src/components/sidebar/TreeItem.vue b/apps/desktop/src/components/sidebar/TreeItem.vue
index 2f5b1a49a..fbe6788ab 100644
--- a/apps/desktop/src/components/sidebar/TreeItem.vue
+++ b/apps/desktop/src/components/sidebar/TreeItem.vue
@@ -44,8 +44,9 @@ import { Badge } from "@/components/ui/badge";
 import { Input } from "@/components/ui/input";
 import LightTooltip from "@/components/ui/LightTooltip.vue";
 import type { ColumnInfo, ConnectionConfig, DatabaseType, TreeNode, TreeNodeType } from "@/types/database";
-import { canTreeNodeShowExpander, trailingCommentAvailableWidth, trailingCommentGapPx, treeItemPaddingLeft, treeLabelWidthClass, usesFullWidthTreeLabel } from "@/lib/sidebar/sidebarTreeItemLayout";
+import { canTreeNodeShowExpander, sidebarTreeNodeComment, treeItemPaddingLeft, treeLabelWidthClass, usesFullWidthTreeLabel } from "@/lib/sidebar/sidebarTreeItemLayout";
 import { clearActiveTableReferencePayload, createTableReferencePayload, createTableReferenceDropEvent, setActiveTableReferencePayload, type QueryEditorTableReferencePayload } from "@/lib/editor/queryEditorTableDrop";
+import { formatSidebarObjectStorage } from "@/lib/sidebar/sidebarDatabaseStorage";
 import { dataTabOpenModeFromTreeClick } from "@/lib/sidebar/dataTabOpenPolicy";
 import { effectiveDatabaseTypeForConnection } from "@/lib/database/jdbcDialect";
 import { hexToRgba } from "@/lib/common/color";
@@ -68,22 +69,12 @@ const labelRef = ref<HTMLElement>();
 
 const rowRef = ref<HTMLElement>();
 
-const trailingCommentLayoutRef = ref<HTMLElement>();
-
-const trailingCommentLeadingRef = ref<HTMLElement>();
-
-const trailingCommentMaxWidth = ref(0);
-
 const labelOverflowing = ref(false);
 
 let labelResizeObserver: ResizeObserver | null = null;
 
-let trailingCommentResizeObserver: ResizeObserver | null = null;
-
 let labelMeasureFrame = 0;
 
-let trailingCommentMeasureFrame = 0;
-
 function cancelLabelOverflowMeasure() {
   if (!labelMeasureFrame) return;
   window.cancelAnimationFrame(labelMeasureFrame);
@@ -150,6 +141,7 @@ const props = defineProps<{
   dragDisabled?: boolean;
   pendingRename?: boolean;
   highlighted?: boolean;
+  commentLabelWidth?: number;
 }>();
 
 const emit = defineEmits<{
@@ -549,71 +541,26 @@ const isNodeDefaultDatabase = computed(
 );
 
 const trailingComment = computed(() => {
-  if (settingsStore.editorSettings.sidebarHideTableComments) return null;
-  if (activeNode.value.type === "column" && activeNode.value.meta && "comment" in activeNode.value.meta) return (activeNode.value.meta as any).comment || null;
-  if ((activeNode.value.type === "schema" || activeNode.value.type === "table" || activeNode.value.type === "view" || activeNode.value.type === "mongo-collection" || activeNode.value.type === "vector-collection" || activeNode.value.type === "elasticsearch-index") && activeNode.value.comment) {
-    return activeNode.value.comment;
-  }
-  return null;
+  if (settingsStore.editorSettings.sidebarObjectInfoMode !== "comment-inline" && settingsStore.editorSettings.sidebarObjectInfoMode !== "comment-aligned") return null;
+  return sidebarTreeNodeComment(activeNode.value);
 });
 
-function cancelTrailingCommentMeasure() {
-  if (!trailingCommentMeasureFrame) return;
-  window.cancelAnimationFrame(trailingCommentMeasureFrame);
-  trailingCommentMeasureFrame = 0;
+function formattedObjectStorage(): string {
+  if (settingsStore.editorSettings.sidebarObjectInfoMode !== "size" || (activeNode.value.type !== "database" && activeNode.value.type !== "table" && activeNode.value.type !== "materialized_view")) return "";
+  return formatSidebarObjectStorage(activeNode.value.sizeBytes);
 }
 
-function measureTrailingCommentLayout() {
-  const container = trailingCommentLayoutRef.value;
-  const leading = trailingCommentLeadingRef.value;
-  if (!trailingComment.value || !container || !leading) {
-    trailingCommentMaxWidth.value = 0;
-    return;
-  }
+const alignedCommentLabelWidth = computed(() => (settingsStore.editorSettings.sidebarObjectInfoMode === "comment-aligned" ? props.commentLabelWidth : undefined));
 
-  // The leading group keeps the complete table name ahead of the comment.
-  // Only the width remaining after that name and the fixed gap may be used
-  // by the comment; once it reaches zero, the comment is hidden.
-  trailingCommentMaxWidth.value = trailingCommentAvailableWidth(container.clientWidth, leading.scrollWidth);
+function hasTrailingMetadata(): boolean {
+  return !!trailingComment.value || !!formattedObjectStorage();
 }
 
-function scheduleTrailingCommentMeasure() {
-  if (typeof window === "undefined") {
-    measureTrailingCommentLayout();
-    return;
-  }
-  cancelTrailingCommentMeasure();
-  trailingCommentMeasureFrame = window.requestAnimationFrame(() => {
-    trailingCommentMeasureFrame = 0;
-    measureTrailingCommentLayout();
-  });
-}
-
-function refreshTrailingCommentMeasurement() {
-  trailingCommentResizeObserver?.disconnect();
-  trailingCommentResizeObserver = null;
-
-  if (!trailingComment.value || !trailingCommentLayoutRef.value || !trailingCommentLeadingRef.value) {
-    trailingCommentMaxWidth.value = 0;
-    return;
-  }
-
-  scheduleTrailingCommentMeasure();
-  if (typeof ResizeObserver !== "undefined") {
-    trailingCommentResizeObserver = new ResizeObserver(scheduleTrailingCommentMeasure);
-    trailingCommentResizeObserver.observe(trailingCommentLayoutRef.value);
-  }
-}
-
-// Keep comment rows constrained to the sidebar. When space is tight, the
-// comment truncates before the table name instead of creating a large gap.
-const usesFullWidthLabel = computed(() => usesFullWidthTreeLabel(activeNode.value.type, settingsStore.editorSettings.sidebarAllowHorizontalScroll, !!trailingComment.value));
+const usesFullWidthLabel = computed(() => usesFullWidthTreeLabel(activeNode.value.type, settingsStore.editorSettings.sidebarAllowHorizontalScroll, hasTrailingMetadata()));
 
 const rowWidthClass = computed(() => (usesFullWidthLabel.value ? "w-max min-w-full" : "w-full min-w-0"));
 
-const labelWidthClass = computed(() => treeLabelWidthClass({ fullWidth: usesFullWidthLabel.value, hasTrailingComment: !!trailingComment.value }));
-
-watch(() => [trailingComment.value, visibleLabel(activeNode.value), trailingCommentLayoutRef.value, trailingCommentLeadingRef.value], refreshTrailingCommentMeasurement, { flush: "post", immediate: true });
+const labelWidthClass = computed(() => treeLabelWidthClass({ fullWidth: usesFullWidthLabel.value, hasTrailingComment: hasTrailingMetadata() }));
 
 const paddingLeft = computed(() => treeItemPaddingLeft(props.depth));
 
@@ -921,8 +868,6 @@ watch(
 onBeforeUnmount(() => {
   stopPasteHandlerRegistration();
   handleMouseLeave();
-  trailingCommentResizeObserver?.disconnect();
-  cancelTrailingCommentMeasure();
   finishTableReferenceDrag();
 });
 
@@ -1058,8 +1003,8 @@ function onKeydown(event: KeyboardEvent) {
         <DatabaseIcon v-if="node.type === 'connection'" :db-type="connectionIconType(node.connectionId)" class="h-3.5 w-3.5 shrink-0" />
         <Loader2 v-else-if="node.type === 'load-more' && node.isLoading" class="w-3.5 h-3.5 shrink-0 animate-spin text-primary" />
         <component v-else :is="getIconInfo(node)?.icon || Database" class="w-3.5 h-3.5 shrink-0" :class="databaseOpenVisual.iconClass" />
-        <div ref="trailingCommentLayoutRef" :class="trailingComment ? 'flex flex-1 min-w-0 items-center' : 'contents'">
-          <div ref="trailingCommentLeadingRef" :class="trailingComment ? 'flex max-w-full min-w-0 shrink-0 items-center gap-2' : 'contents'">
+        <div :class="hasTrailingMetadata() ? 'flex flex-1 min-w-0 items-center' : 'contents'">
+          <div :class="trailingComment ? 'flex max-w-full min-w-0 shrink-0 items-center gap-2' : formattedObjectStorage() ? 'flex min-w-0 flex-1 items-center gap-2' : 'contents'" :style="alignedCommentLabelWidth ? { width: `${alignedCommentLabelWidth}px` } : undefined">
             <input
               v-if="isRenamingGroup"
               ref="renameInputRef"
@@ -1084,20 +1029,14 @@ function onKeydown(event: KeyboardEvent) {
               {{ t("editor.defaultDatabase") }}
             </Badge>
           </div>
-          <span v-if="trailingComment && trailingCommentMaxWidth > 0" class="min-w-0 flex-1" aria-hidden="true" />
-          <span
-            v-if="trailingComment && trailingCommentMaxWidth > 0"
-            class="sidebar-object-comment min-w-0 shrink-0 truncate text-left"
-            :class="{ 'sidebar-object-comment--windows': useWindowsSidebarCommentFont }"
-            :style="{ marginLeft: `${trailingCommentGapPx}px`, maxWidth: `${trailingCommentMaxWidth}px` }"
-            >{{ trailingComment }}</span
-          >
+          <span v-if="trailingComment" class="sidebar-object-comment ml-2 min-w-0 flex-1 truncate text-left" :class="{ 'sidebar-object-comment--windows': useWindowsSidebarCommentFont }">{{ trailingComment }}</span>
         </div>
         <span v-if="node.type === 'connection' && node.connectionId && connectionStore.connectedIds.has(node.connectionId)" class="w-1.5 h-1.5 rounded-full bg-green-500 shrink-0" />
         <span v-if="databaseOpenVisual.showsIndicator" class="w-1.5 h-1.5 rounded-full bg-green-500 shrink-0" />
         <Badge v-if="isConnectionReadonly" variant="secondary" class="h-4 px-1.5 text-[10px] gap-0.5"><Lock class="w-2.5 h-2.5" />{{ t("connection.readOnlyBadge") }}</Badge>
         <ConnectionErrorIndicator v-if="node.type === 'connection'" :connection-id="node.connectionId" trigger-class="h-4 w-4" />
         <Pin v-if="isPinned" class="w-3 h-3 shrink-0 text-primary fill-current" aria-hidden="true" />
+        <span v-if="formattedObjectStorage()" class="ml-auto shrink-0 text-right text-xs tabular-nums text-muted-foreground">{{ formattedObjectStorage() }}</span>
         <button
           v-if="isConnecting"
           type="button"
@@ -1145,11 +1084,6 @@ function onKeydown(event: KeyboardEvent) {
   font-size: 10px;
   line-height: 1rem;
   opacity: 0.6;
-  /* Use the comment's natural width whenever the row has room for it. */
-  width: max-content;
-  max-width: 100%;
-  /* Preserve table names when a narrow row needs to truncate its comment. */
-  flex-shrink: 999;
   /* Sidebar rows repaint on hover; avoid heavier font shaping and fallback here. */
   text-rendering: auto;
 }
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 0e4704c97..5fcd4f301 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -3816,8 +3816,13 @@ export default {
     sidebarTablePageSizeDescription: "Maximum number of tables/objects loaded per page in the sidebar tree. Increase if you have many tables and want fewer pages.",
     sidebarTableSearchEnabled: "Enable table search inside databases",
     sidebarTableSearchEnabledDescription: "Show a local table search box under expanded databases, schemas, or table groups so each scope can filter tables independently.",
-    sidebarHideTableComments: "Hide table comments in sidebar",
-    sidebarHideTableCommentsDescription: "Hide the inline table/view comments shown next to names in the sidebar tree to save horizontal space.",
+    sidebarObjectInfoMode: "Sidebar supplementary info",
+    sidebarObjectInfoModeDescription:
+      "Choose comments, object sizes, or no supplementary text after names. Comments and sizes are mutually exclusive. Database totals currently support PostgreSQL; table sizes support MySQL, PostgreSQL, GaussDB, Kingbase, GBase 8a, SQL Server, Oracle, Dameng, and ClickHouse.",
+    sidebarObjectInfoModeCommentInline: "Comments (after name)",
+    sidebarObjectInfoModeCommentAligned: "Comments (align siblings)",
+    sidebarObjectInfoModeSize: "Object size",
+    sidebarObjectInfoModeHidden: "None",
     sidebarAllowHorizontalScroll: "Allow sidebar horizontal scroll",
     sidebarAllowHorizontalScrollDescription: "Show long table, view, and collection names in full by allowing horizontal sidebar scrolling.",
     snippetsDescription: "Customize SQL snippet templates triggered in the editor.",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index 84dc2cfee..35634081b 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -3594,8 +3594,13 @@ export default withEnglishFallback({
     sidebarTablePageSizeDescription: "Número máximo de tablas/objetos cargados por página en el árbol lateral. Auméntalo si tienes muchas tablas para reducir páginas.",
     sidebarTableSearchEnabled: "Activar búsqueda de tablas por base",
     sidebarTableSearchEnabledDescription: "Muestra un buscador local bajo bases de datos, schemas o grupos de tablas expandidos para filtrar tablas por separado.",
-    sidebarHideTableComments: "Ocultar comentarios de tablas en la barra lateral",
-    sidebarHideTableCommentsDescription: "Oculta los comentarios de tablas/vistas junto a los nombres en el árbol de la barra lateral para ahorrar espacio horizontal.",
+    sidebarObjectInfoMode: "Información adicional lateral",
+    sidebarObjectInfoModeDescription:
+      "Elige comentarios, tamaños de objetos o ningún texto tras los nombres. Los comentarios y tamaños son excluyentes. El tamaño total de bases admite PostgreSQL; los tamaños de tablas admiten MySQL, PostgreSQL, GaussDB, Kingbase, GBase 8a, SQL Server, Oracle, Dameng y ClickHouse.",
+    sidebarObjectInfoModeCommentInline: "Comentarios (junto al nombre)",
+    sidebarObjectInfoModeCommentAligned: "Comentarios (alinear nivel)",
+    sidebarObjectInfoModeSize: "Tamaño del objeto",
+    sidebarObjectInfoModeHidden: "Ninguna",
     sidebarAllowHorizontalScroll: "Permitir desplazamiento horizontal lateral",
     sidebarAllowHorizontalScrollDescription: "Muestra completos los nombres largos de tablas, vistas y colecciones permitiendo desplazamiento horizontal en la barra lateral.",
     snippetsDescription: "Personaliza plantillas SQL activadas en el editor.",
diff --git a/apps/desktop/src/i18n/locales/it.ts b/apps/desktop/src/i18n/locales/it.ts
index dc4ba774e..b6ae711e0 100644
--- a/apps/desktop/src/i18n/locales/it.ts
+++ b/apps/desktop/src/i18n/locales/it.ts
@@ -3592,8 +3592,13 @@ export default withEnglishFallback({
     sidebarTablePageSizeDescription: "Numero massimo di tabelle/oggetti caricati per pagina nell'albero laterale. Aumentalo se hai molte tabelle per ridurre le pagine.",
     sidebarTableSearchEnabled: "Abilita ricerca tabelle nel database",
     sidebarTableSearchEnabledDescription: "Mostra una casella di ricerca locale sotto database, schema o gruppi di tabelle espansi per filtrare le tabelle separatamente.",
-    sidebarHideTableComments: "Nascondi i commenti delle tabelle nella barra laterale",
-    sidebarHideTableCommentsDescription: "Nascondi i commenti in linea delle tabelle/viste mostrati accanto ai nomi nell'albero della barra laterale per risparmiare spazio orizzontale.",
+    sidebarObjectInfoMode: "Informazioni aggiuntive laterali",
+    sidebarObjectInfoModeDescription:
+      "Scegli commenti, dimensioni degli oggetti o nessun testo dopo i nomi. Commenti e dimensioni sono alternativi. La dimensione totale dei database supporta PostgreSQL; le dimensioni delle tabelle supportano MySQL, PostgreSQL, GaussDB, Kingbase, GBase 8a, SQL Server, Oracle, Dameng e ClickHouse.",
+    sidebarObjectInfoModeCommentInline: "Commenti (accanto al nome)",
+    sidebarObjectInfoModeCommentAligned: "Commenti (allinea livello)",
+    sidebarObjectInfoModeSize: "Dimensione oggetto",
+    sidebarObjectInfoModeHidden: "Nessuna",
     sidebarAllowHorizontalScroll: "Consenti scorrimento orizzontale barra laterale",
     sidebarAllowHorizontalScrollDescription: "Mostra i nomi lunghi di tabelle, viste e collezioni per intero consentendo lo scorrimento orizzontale della barra laterale.",
     snippetsDescription: "Personalizza i modelli di snippet SQL attivati nell'editor.",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index 70624bc0a..f651568b5 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -3583,8 +3583,13 @@ export default withEnglishFallback({
     sidebarTablePageSizeDescription: "サイドバーツリーで1ページあたりに読み込むテーブル/オブジェクトの最大数です。テーブルが多い場合は増やすとページ切り替えが減ります。",
     sidebarTableSearchEnabled: "データベース内のテーブル検索を有効化",
     sidebarTableSearchEnabledDescription: "展開済みのデータベース、schema、またはテーブルグループの下にローカル検索ボックスを表示し、スコープごとにテーブルを絞り込みます。",
-    sidebarHideTableComments: "サイドバーのテーブルコメントを非表示",
-    sidebarHideTableCommentsDescription: "横のスペースを節約するため、サイドバーツリーで名前の横に表示されるテーブル/ビューコメントを非表示にします。",
+    sidebarObjectInfoMode: "サイドバーの補足情報",
+    sidebarObjectInfoModeDescription:
+      "名前の後にコメント、オブジェクトサイズ、または何も表示しないかを選択します。コメントとサイズは同時に表示されません。データベース全体のサイズは PostgreSQL、テーブルサイズは MySQL、PostgreSQL、GaussDB、Kingbase、GBase 8a、SQL Server、Oracle、Dameng、ClickHouse に対応しています。",
+    sidebarObjectInfoModeCommentInline: "コメント（名前の直後）",
+    sidebarObjectInfoModeCommentAligned: "コメント（同階層で整列）",
+    sidebarObjectInfoModeSize: "オブジェクトサイズ",
+    sidebarObjectInfoModeHidden: "表示しない",
     sidebarAllowHorizontalScroll: "サイドバーの横スクロールを許可",
     sidebarAllowHorizontalScrollDescription: "サイドバーの横スクロールを許可して、長いテーブル、ビュー、コレクション名を完全に表示します。",
     snippetsDescription: "エディタでトリガーされるSQLスニペットテンプレートをカスタマイズします。",
diff --git a/apps/desktop/src/i18n/locales/pt-BR.ts b/apps/desktop/src/i18n/locales/pt-BR.ts
index acabe648b..93ec3cf9a 100644
--- a/apps/desktop/src/i18n/locales/pt-BR.ts
+++ b/apps/desktop/src/i18n/locales/pt-BR.ts
@@ -3594,8 +3594,13 @@ export default withEnglishFallback({
     sidebarTablePageSizeDescription: "Número máximo de tabelas/objetos carregados por página na árvore lateral. Aumente se tiver muitas tabelas para reduzir páginas.",
     sidebarTableSearchEnabled: "Ativar busca de tabelas por banco",
     sidebarTableSearchEnabledDescription: "Mostra uma busca local sob bancos, schemas ou grupos de tabelas expandidos para filtrar tabelas separadamente.",
-    sidebarHideTableComments: "Ocultar comentários de tabela na barra lateral",
-    sidebarHideTableCommentsDescription: "Ocultar os comentários inline de tabela/view exibidos ao lado dos nomes na árvore da barra lateral para economizar espaço horizontal.",
+    sidebarObjectInfoMode: "Informações adicionais laterais",
+    sidebarObjectInfoModeDescription:
+      "Escolha comentários, tamanhos de objetos ou nenhum texto após os nomes. Comentários e tamanhos são mutuamente exclusivos. O tamanho total dos bancos aceita PostgreSQL; os tamanhos das tabelas aceitam MySQL, PostgreSQL, GaussDB, Kingbase, GBase 8a, SQL Server, Oracle, Dameng e ClickHouse.",
+    sidebarObjectInfoModeCommentInline: "Comentários (junto ao nome)",
+    sidebarObjectInfoModeCommentAligned: "Comentários (alinhar nível)",
+    sidebarObjectInfoModeSize: "Tamanho do objeto",
+    sidebarObjectInfoModeHidden: "Nenhuma",
     sidebarAllowHorizontalScroll: "Permitir rolagem horizontal da barra lateral",
     sidebarAllowHorizontalScrollDescription: "Mostrar nomes longos de tabelas, views e coleções por completo, permitindo a rolagem horizontal da barra lateral.",
     snippetsDescription: "Personalize os modelos de snippets SQL acionados no editor.",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index 7fbe7e85c..353155e3d 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -3806,8 +3806,12 @@ export default withEnglishFallback({
     sidebarTablePageSizeDescription: "侧边栏树每页最多加载的表/对象数量。表多时可以调大减少翻页次数。",
     sidebarTableSearchEnabled: "启用库下表搜索框",
     sidebarTableSearchEnabledDescription: "在已展开的数据库、schema 或表分组下显示局部表搜索框，用于为不同库分别过滤表。",
-    sidebarHideTableComments: "隐藏侧边栏表注释",
-    sidebarHideTableCommentsDescription: "隐藏侧边栏中表名旁边显示的表/视图注释，以节省横向空间。",
+    sidebarObjectInfoMode: "侧边栏附加信息",
+    sidebarObjectInfoModeDescription: "选择在名称后显示注释、对象大小或不显示。注释与大小互斥；数据库总大小目前支持 PostgreSQL，表大小支持 MySQL、PostgreSQL、GaussDB、Kingbase、GBase 8a、SQL Server、Oracle、达梦和 ClickHouse。",
+    sidebarObjectInfoModeCommentInline: "注释（紧跟名称）",
+    sidebarObjectInfoModeCommentAligned: "注释（同级对齐）",
+    sidebarObjectInfoModeSize: "对象大小",
+    sidebarObjectInfoModeHidden: "不显示",
     sidebarAllowHorizontalScroll: "允许侧边栏横向滚动",
     sidebarAllowHorizontalScrollDescription: "完整显示较长的表、视图和集合名称；默认关闭以保留省略号截断。",
     snippetsDescription: "自定义编辑器中触发的 SQL 代码片段模板。",
diff --git a/apps/desktop/src/i18n/locales/zh-TW.ts b/apps/desktop/src/i18n/locales/zh-TW.ts
index 9caadf126..af0cdf42a 100644
--- a/apps/desktop/src/i18n/locales/zh-TW.ts
+++ b/apps/desktop/src/i18n/locales/zh-TW.ts
@@ -3406,8 +3406,12 @@ export default withEnglishFallback({
     sidebarTablePageSizeDescription: "側邊欄樹每頁最多載入的資料表/物件數量。資料表多時可調大減少翻頁次數。",
     sidebarTableSearchEnabled: "啟用庫下資料表搜尋框",
     sidebarTableSearchEnabledDescription: "在已展開的資料庫、schema 或資料表分組下顯示局部資料表搜尋框，用於為不同庫分別篩選資料表。",
-    sidebarHideTableComments: "隱藏側邊欄資料表註解",
-    sidebarHideTableCommentsDescription: "隱藏側邊欄樹狀清單中名稱旁的資料表/檢視註解，以節省橫向空間。",
+    sidebarObjectInfoMode: "側邊欄附加資訊",
+    sidebarObjectInfoModeDescription: "選擇在名稱後顯示註解、物件大小或不顯示。註解與大小互斥；資料庫總大小目前支援 PostgreSQL，資料表大小支援 MySQL、PostgreSQL、GaussDB、Kingbase、GBase 8a、SQL Server、Oracle、達夢和 ClickHouse。",
+    sidebarObjectInfoModeCommentInline: "註解（緊接名稱）",
+    sidebarObjectInfoModeCommentAligned: "註解（同層對齊）",
+    sidebarObjectInfoModeSize: "物件大小",
+    sidebarObjectInfoModeHidden: "不顯示",
     sidebarAllowHorizontalScroll: "允許側邊欄水平捲動",
     sidebarAllowHorizontalScrollDescription: "透過啟用側邊欄的水平捲動功能，完整顯示長表格、檢視和集合的名稱",
     snippetsDescription: "自訂編輯器中觸發的 SQL 程式碼片段範本。",
diff --git a/apps/desktop/src/lib/__tests__/sidebar/sidebarDatabaseStorage.spec.ts b/apps/desktop/src/lib/__tests__/sidebar/sidebarDatabaseStorage.spec.ts
new file mode 100644
index 000000000..b8be48b76
--- /dev/null
+++ b/apps/desktop/src/lib/__tests__/sidebar/sidebarDatabaseStorage.spec.ts
@@ -0,0 +1,65 @@
+import { describe, expect, it } from "vitest";
+import { applySidebarDatabaseStorage, applySidebarTableStorage, formatSidebarObjectStorage, sidebarDatabaseNames, sidebarTableStorageScopes, supportsSidebarDatabaseStorage, supportsSidebarTableStorage } from "@/lib/sidebar/sidebarDatabaseStorage";
+import type { ConnectionConfig, TreeNode } from "@/types/database";
+
+function config(dbType: ConnectionConfig["db_type"]): ConnectionConfig {
+  return { id: "connection", name: "connection", db_type: dbType } as ConnectionConfig;
+}
+
+describe("sidebar database storage", () => {
+  it("keeps database totals PostgreSQL-specific while reusing supported table statistics", () => {
+    expect(supportsSidebarDatabaseStorage(config("postgres"))).toBe(true);
+    expect(supportsSidebarDatabaseStorage(config("mysql"))).toBe(false);
+    expect(supportsSidebarDatabaseStorage({ ...config("postgres"), driver_profile: "cockroachdb" })).toBe(false);
+
+    for (const dbType of ["mysql", "postgres", "sqlserver", "oracle", "clickhouse", "dameng", "gaussdb", "kingbase", "gbase"] as const) {
+      expect(supportsSidebarTableStorage(config(dbType))).toBe(true);
+    }
+    expect(supportsSidebarTableStorage(config("jdbc"))).toBe(false);
+    expect(supportsSidebarTableStorage({ ...config("postgres"), driver_profile: "cockroachdb" })).toBe(false);
+    expect(supportsSidebarTableStorage({ ...config("gbase"), driver_profile: "gbase8s" })).toBe(false);
+  });
+
+  it("requests and applies only visible database nodes", () => {
+    const nodes: TreeNode[] = [
+      { id: "a", label: "app", type: "database", connectionId: "connection", database: "app" },
+      { id: "b", label: "hidden", type: "database", connectionId: "connection", database: "hidden" },
+      { id: "utility", label: "users", type: "user-admin", connectionId: "connection" },
+    ];
+    expect(sidebarDatabaseNames(nodes)).toEqual(["app", "hidden"]);
+    expect(applySidebarDatabaseStorage(nodes, [{ name: "app", size_bytes: 2048 }])).toBe(true);
+    expect(nodes[0].sizeBytes).toBe(2048);
+    expect(nodes[1].sizeBytes).toBeUndefined();
+  });
+
+  it("keeps unavailable values blank and formats known sizes compactly", () => {
+    expect(formatSidebarObjectStorage(null)).toBe("");
+    expect(formatSidebarObjectStorage(0)).toBe("0 B");
+    expect(formatSidebarObjectStorage(1536)).toBe("1.5 KB");
+    expect(formatSidebarObjectStorage(15 * 1024 * 1024)).toBe("15 MB");
+    expect(formatSidebarObjectStorage(15.25 * 1024 * 1024)).toBe("15.3 MB");
+  });
+
+  it("collects table scopes and applies PostgreSQL table sizes without crossing schemas", () => {
+    const publicTable: TreeNode = { id: "public-users", label: "users", type: "table", connectionId: "connection", database: "app", schema: "public" };
+    const auditTable: TreeNode = { id: "audit-users", label: "users", type: "table", connectionId: "connection", database: "app", schema: "audit" };
+    const nodes: TreeNode[] = [
+      { id: "public", label: "public", type: "schema", connectionId: "connection", database: "app", schema: "public", children: [publicTable] },
+      { id: "audit", label: "audit", type: "schema", connectionId: "connection", database: "app", schema: "audit", children: [auditTable] },
+    ];
+
+    expect(sidebarTableStorageScopes([publicTable, auditTable])).toEqual([
+      { connectionId: "connection", database: "app", schema: "public" },
+      { connectionId: "connection", database: "app", schema: "audit" },
+    ]);
+    expect(applySidebarTableStorage(nodes, { connectionId: "connection", database: "app", schema: "public" }, [{ name: "users", schema: "public", total_bytes: 8192 }])).toBe(true);
+    expect(publicTable.sizeBytes).toBe(8192);
+    expect(auditTable.sizeBytes).toBeUndefined();
+  });
+
+  it("applies database-scoped MySQL statistics to tree nodes without a schema", () => {
+    const table: TreeNode = { id: "products", label: "products", type: "table", connectionId: "connection", database: "shop" };
+    expect(applySidebarTableStorage([table], { connectionId: "connection", database: "shop", schema: "" }, [{ name: "products", schema: "shop", total_bytes: 49152 }])).toBe(true);
+    expect(table.sizeBytes).toBe(49152);
+  });
+});
diff --git a/apps/desktop/src/lib/__tests__/sidebar/sidebarTreeItemLayout.spec.ts b/apps/desktop/src/lib/__tests__/sidebar/sidebarTreeItemLayout.spec.ts
index d9abd9f94..459251149 100644
--- a/apps/desktop/src/lib/__tests__/sidebar/sidebarTreeItemLayout.spec.ts
+++ b/apps/desktop/src/lib/__tests__/sidebar/sidebarTreeItemLayout.spec.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { trailingCommentAvailableWidth, treeLabelWidthClass, usesFullWidthTreeLabel } from "@/lib/sidebar/sidebarTreeItemLayout";
+import { alignedSidebarCommentLabelWidths, treeLabelWidthClass, usesFullWidthTreeLabel } from "@/lib/sidebar/sidebarTreeItemLayout";
 
 describe("sidebar tree item layout", () => {
   it("keeps a table row constrained when it displays a comment", () => {
@@ -11,10 +11,17 @@ describe("sidebar tree item layout", () => {
     expect(treeLabelWidthClass({ fullWidth: false, hasTrailingComment: true })).toBe("min-w-0 flex-1 truncate");
   });
 
-  it("gives the comment only the width left after the full table name and gap", () => {
-    expect(trailingCommentAvailableWidth(260, 100)).toBe(152);
-    expect(trailingCommentAvailableWidth(108, 100)).toBe(0);
-    expect(trailingCommentAvailableWidth(100, 100)).toBe(0);
-    expect(trailingCommentAvailableWidth(99, 100)).toBe(0);
+  it("aligns comments to the longest sibling name without crossing parent groups", () => {
+    const widths = alignedSidebarCommentLabelWidths([
+      { id: "tables", depth: 1, alignable: false, hasComment: false, labelWidth: 0 },
+      { id: "short", depth: 2, alignable: true, hasComment: true, labelWidth: 48 },
+      { id: "long", depth: 2, alignable: true, hasComment: false, labelWidth: 136 },
+      { id: "views", depth: 1, alignable: false, hasComment: false, labelWidth: 0 },
+      { id: "view", depth: 2, alignable: true, hasComment: true, labelWidth: 72 },
+    ]);
+
+    expect(widths.get("short")).toBe(136);
+    expect(widths.has("long")).toBe(false);
+    expect(widths.get("view")).toBe(72);
   });
 });
diff --git a/apps/desktop/src/lib/backend/api.ts b/apps/desktop/src/lib/backend/api.ts
index 21b90dc54..855d8cbf9 100644
--- a/apps/desktop/src/lib/backend/api.ts
+++ b/apps/desktop/src/lib/backend/api.ts
@@ -133,6 +133,7 @@ export const syncSavedSqlDirectory = forward("syncSavedSqlDirectory");
 
 // Schema
 export const listDatabases = forward("listDatabases");
+export const listDatabaseStorage = forward("listDatabaseStorage");
 export const listDorisCatalogs = forward("listDorisCatalogs");
 export const listDorisCatalogDatabases = forward("listDorisCatalogDatabases");
 export const listSqlServerLinkedServers = forward("listSqlServerLinkedServers");
diff --git a/apps/desktop/src/lib/backend/http.ts b/apps/desktop/src/lib/backend/http.ts
index 170f91b3f..65b491a87 100644
--- a/apps/desktop/src/lib/backend/http.ts
+++ b/apps/desktop/src/lib/backend/http.ts
@@ -3,6 +3,7 @@ import type {
   ConnectionTestResult,
   DatabaseConnectionInfo,
   DatabaseInfo,
+  DatabaseStorageInfo,
   SchemaInfo,
   LinkedServerInfo,
   CatalogInfo,
@@ -570,6 +571,10 @@ export async function listDatabases(connectionId: string): Promise<DatabaseInfo[
   return get(`/api/schema/databases?${qs({ connection_id: connectionId })}`);
 }
 
+export async function listDatabaseStorage(connectionId: string, databases: string[]): Promise<DatabaseStorageInfo[]> {
+  return post("/api/schema/database-storage", { connection_id: connectionId, databases });
+}
+
 export async function listDorisCatalogs(connectionId: string): Promise<CatalogInfo[]> {
   return get(`/api/schema/doris/catalogs?${qs({ connection_id: connectionId })}`);
 }
diff --git a/apps/desktop/src/lib/backend/tauri.ts b/apps/desktop/src/lib/backend/tauri.ts
index 448c741c7..29c358b6b 100644
--- a/apps/desktop/src/lib/backend/tauri.ts
+++ b/apps/desktop/src/lib/backend/tauri.ts
@@ -6,6 +6,7 @@ import type {
   ConnectionTestResult,
   DatabaseConnectionInfo,
   DatabaseInfo,
+  DatabaseStorageInfo,
   SchemaInfo,
   LinkedServerInfo,
   CatalogInfo,
@@ -759,6 +760,10 @@ export async function listDatabases(connectionId: string): Promise<DatabaseInfo[
   return invoke("list_databases", { connectionId });
 }
 
+export async function listDatabaseStorage(connectionId: string, databases: string[]): Promise<DatabaseStorageInfo[]> {
+  return invoke("list_database_storage", { connectionId, databases });
+}
+
 export async function listDorisCatalogs(connectionId: string): Promise<CatalogInfo[]> {
   return invoke("list_doris_catalogs", { connectionId });
 }
diff --git a/apps/desktop/src/lib/settings/editorSettingsDraft.ts b/apps/desktop/src/lib/settings/editorSettingsDraft.ts
index df29d2f8e..5e2a4f5b6 100644
--- a/apps/desktop/src/lib/settings/editorSettingsDraft.ts
+++ b/apps/desktop/src/lib/settings/editorSettingsDraft.ts
@@ -44,7 +44,7 @@ export const EDITOR_SETTINGS_DRAFT_KEYS = [
   "reuseDataTab",
   "prefillNewQueryWithSelect",
   "updateNotificationsEnabled",
-  "sidebarHideTableComments",
+  "sidebarObjectInfoMode",
   "sidebarAllowHorizontalScroll",
   "sidebarHiddenTablePrefixes",
   "exportBatchSize",
diff --git a/apps/desktop/src/lib/sidebar/sidebarDatabaseStorage.ts b/apps/desktop/src/lib/sidebar/sidebarDatabaseStorage.ts
new file mode 100644
index 000000000..5541d4814
--- /dev/null
+++ b/apps/desktop/src/lib/sidebar/sidebarDatabaseStorage.ts
@@ -0,0 +1,84 @@
+import type { ConnectionConfig, DatabaseStorageInfo, ObjectStatistics, TreeNode } from "@/types/database";
+
+const sidebarTableStorageTypes = new Set<ConnectionConfig["db_type"]>(["mysql", "postgres", "sqlserver", "oracle", "clickhouse", "dameng", "gaussdb", "kingbase", "gbase"]);
+
+export function supportsSidebarDatabaseStorage(connection: ConnectionConfig | undefined): boolean {
+  return connection?.db_type === "postgres" && connection.driver_profile !== "cockroachdb";
+}
+
+export function supportsSidebarTableStorage(connection: ConnectionConfig | undefined): boolean {
+  if (!connection || !sidebarTableStorageTypes.has(connection.db_type)) return false;
+  if (connection.db_type === "gbase" && connection.driver_profile === "gbase8s") return false;
+  return connection.db_type !== "postgres" || connection.driver_profile !== "cockroachdb";
+}
+
+export function sidebarDatabaseNames(nodes: readonly TreeNode[] | undefined): string[] {
+  if (!nodes) return [];
+  return nodes.flatMap((node) => (node.type === "database" && !node.catalog && node.database ? [node.database] : []));
+}
+
+export function applySidebarDatabaseStorage(nodes: readonly TreeNode[] | undefined, storage: readonly DatabaseStorageInfo[]): boolean {
+  if (!nodes?.length || !storage.length) return false;
+  const byName = new Map(storage.map((item) => [item.name, item.size_bytes] as const));
+  let changed = false;
+  for (const node of nodes) {
+    if (node.type !== "database" || node.catalog || !node.database || !byName.has(node.database)) continue;
+    const sizeBytes = byName.get(node.database) ?? null;
+    if (node.sizeBytes === sizeBytes) continue;
+    node.sizeBytes = sizeBytes;
+    changed = true;
+  }
+  return changed;
+}
+
+export interface SidebarTableStorageScope {
+  connectionId: string;
+  database: string;
+  schema: string;
+}
+
+export function sidebarTableStorageScopes(nodes: readonly TreeNode[]): SidebarTableStorageScope[] {
+  const scopes = new Map<string, SidebarTableStorageScope>();
+  for (const node of nodes) {
+    if ((node.type !== "table" && node.type !== "materialized_view") || !node.connectionId || !node.database) continue;
+    const scope = { connectionId: node.connectionId, database: node.database, schema: node.schema || "" };
+    scopes.set(`${scope.connectionId}\0${scope.database}\0${scope.schema}`, scope);
+  }
+  return [...scopes.values()];
+}
+
+export function applySidebarTableStorage(nodes: readonly TreeNode[] | undefined, scope: SidebarTableStorageScope, statistics: readonly ObjectStatistics[]): boolean {
+  if (!nodes?.length || !statistics.length) return false;
+  const sizeByName = new Map(statistics.filter((item) => !scope.schema || !item.schema || item.schema === scope.schema).map((item) => [item.name, item.total_bytes ?? null] as const));
+  let changed = false;
+  const visit = (items: readonly TreeNode[]) => {
+    for (const node of items) {
+      if ((node.type === "table" || node.type === "materialized_view") && node.connectionId === scope.connectionId && node.database === scope.database && (node.schema || "") === scope.schema && sizeByName.has(node.label)) {
+        const sizeBytes = sizeByName.get(node.label) ?? null;
+        if (node.sizeBytes !== sizeBytes) {
+          node.sizeBytes = sizeBytes;
+          changed = true;
+        }
+      }
+      if (node.children?.length) visit(node.children);
+      if (node.hiddenChildren?.length) visit(node.hiddenChildren);
+    }
+  };
+  visit(nodes);
+  return changed;
+}
+
+export function formatSidebarObjectStorage(value: number | null | undefined): string {
+  if (typeof value !== "number" || !Number.isFinite(value) || value < 0) return "";
+  const units = ["B", "KB", "MB", "GB", "TB", "PB"];
+  let size = value;
+  let unitIndex = 0;
+  while (size >= 1024 && unitIndex < units.length - 1) {
+    size /= 1024;
+    unitIndex++;
+  }
+  const fractionDigits = unitIndex === 0 || size >= 100 ? 0 : size >= 10 ? 1 : 2;
+  const rounded = size.toFixed(fractionDigits);
+  const displaySize = rounded.includes(".") ? rounded.replace(/0+$/, "").replace(/\.$/, "") : rounded;
+  return `${displaySize} ${units[unitIndex]}`;
+}
diff --git a/apps/desktop/src/lib/sidebar/sidebarTreeItemLayout.ts b/apps/desktop/src/lib/sidebar/sidebarTreeItemLayout.ts
index 15294281a..5a8682aa5 100644
--- a/apps/desktop/src/lib/sidebar/sidebarTreeItemLayout.ts
+++ b/apps/desktop/src/lib/sidebar/sidebarTreeItemLayout.ts
@@ -1,4 +1,4 @@
-import type { TreeNodeType } from "@/types/database";
+import type { TreeNode, TreeNodeType } from "@/types/database";
 
 const leafTypes: Set<TreeNodeType> = new Set([
   "column",
@@ -51,14 +51,53 @@ const pinnableTypes: Set<TreeNodeType> = new Set([
   "nacos-namespace",
 ]);
 
+const commentTypes: Set<TreeNodeType> = new Set(["schema", "table", "view", "materialized_view", "column", "mongo-collection", "vector-collection", "elasticsearch-index"]);
+
 export function treeItemPaddingLeft(depth: number): string {
   return `${depth * 16 + 8}px`;
 }
 
-export const trailingCommentGapPx = 8;
+export interface SidebarCommentAlignmentItem {
+  id: string;
+  depth: number;
+  alignable: boolean;
+  hasComment: boolean;
+  labelWidth: number;
+}
 
-export function trailingCommentAvailableWidth(containerWidth: number, leadingWidth: number): number {
-  return Math.max(0, Math.floor(containerWidth - leadingWidth - trailingCommentGapPx));
+export function alignedSidebarCommentLabelWidths(items: readonly SidebarCommentAlignmentItem[]): Map<string, number> {
+  const ancestorIds: string[] = [];
+  const parentIdByCommentId = new Map<string, string>();
+  const maxWidthByParentId = new Map<string, number>();
+
+  for (const item of items) {
+    ancestorIds.length = item.depth;
+    const parentId = item.depth > 0 ? (ancestorIds[item.depth - 1] ?? "__root__") : "__root__";
+    ancestorIds[item.depth] = item.id;
+    if (!item.alignable) continue;
+
+    maxWidthByParentId.set(parentId, Math.max(maxWidthByParentId.get(parentId) ?? 0, Math.ceil(item.labelWidth)));
+    if (item.hasComment) parentIdByCommentId.set(item.id, parentId);
+  }
+
+  const widths = new Map<string, number>();
+  for (const [id, parentId] of parentIdByCommentId) {
+    widths.set(id, maxWidthByParentId.get(parentId) ?? 0);
+  }
+  return widths;
+}
+
+export function sidebarTreeNodeComment(node: TreeNode): string | null {
+  if (!commentTypes.has(node.type)) return null;
+  if (node.type === "column" && node.meta && "comment" in node.meta) {
+    const comment = node.meta.comment;
+    return typeof comment === "string" && comment ? comment : null;
+  }
+  return node.comment || null;
+}
+
+export function isSidebarCommentAlignableNode(node: TreeNode): boolean {
+  return commentTypes.has(node.type);
 }
 
 export function usesFullWidthTreeLabel(type: TreeNodeType, allowHorizontalScroll: boolean, hasTrailingComment = false): boolean {
diff --git a/apps/desktop/src/stores/__tests__/settingsStore.spec.ts b/apps/desktop/src/stores/__tests__/settingsStore.spec.ts
index fccb0e250..9fa219243 100644
--- a/apps/desktop/src/stores/__tests__/settingsStore.spec.ts
+++ b/apps/desktop/src/stores/__tests__/settingsStore.spec.ts
@@ -1,9 +1,24 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import { enforceRightSidebarPanelExclusivity, EXECUTE_MODE_CURRENT_DEFAULT_VERSION, normalizeDesktopSettings, normalizeEditorSettings, normalizeMcpGlobalPolicy, transitionRightSidebarPanels, type RightSidebarPanelState } from "@/stores/settingsStore";
 import { createPinia, setActivePinia } from "pinia";
+import { isProxy } from "vue";
 import type { AiConfigItem } from "@/types/ai";
 
 describe("normalizeEditorSettings", () => {
+  it("uses aligned comments by default and preserves legacy comment visibility", () => {
+    expect(normalizeEditorSettings({}).sidebarObjectInfoMode).toBe("comment-aligned");
+    expect(normalizeEditorSettings({ sidebarObjectInfoMode: "comment-aligned" }).sidebarObjectInfoMode).toBe("comment-aligned");
+    expect(normalizeEditorSettings({ sidebarObjectInfoMode: "comment-inline" }).sidebarObjectInfoMode).toBe("comment-inline");
+    expect(normalizeEditorSettings({ sidebarObjectInfoMode: "size" }).sidebarObjectInfoMode).toBe("size");
+    expect(normalizeEditorSettings({ sidebarTableCommentLayout: "aligned" } as any).sidebarObjectInfoMode).toBe("comment-aligned");
+    expect(normalizeEditorSettings({ sidebarTableCommentLayout: "hidden" } as any).sidebarObjectInfoMode).toBe("hidden");
+    expect(normalizeEditorSettings({ sidebarHideTableComments: false } as any).sidebarObjectInfoMode).toBe("comment-aligned");
+    expect(normalizeEditorSettings({ sidebarHideTableComments: true } as any).sidebarObjectInfoMode).toBe("hidden");
+    expect(normalizeEditorSettings({ sidebarHideTableComments: true, sidebarShowDatabaseSizes: true } as any).sidebarObjectInfoMode).toBe("hidden");
+    expect(normalizeEditorSettings({ sidebarShowDatabaseSizes: true } as any).sidebarObjectInfoMode).toBe("size");
+    expect(normalizeEditorSettings({ sidebarObjectInfoMode: "invalid" } as any).sidebarObjectInfoMode).toBe("comment-aligned");
+  });
+
   it("defaults SQL execution to the current statement and migrates legacy execute-all settings", () => {
     expect(normalizeEditorSettings({}).executeMode).toBe("current");
     expect(normalizeEditorSettings({ executeMode: "all" }).executeMode).toBe("current");
@@ -322,6 +337,10 @@ describe("settingsStore sidebar connection sort persistence", () => {
 
     expect(store.editorSettings.sidebarConnectionSortMode).toBe("desc");
     expect(saveEditorSettings).toHaveBeenCalledWith(expect.objectContaining({ sidebarConnectionSortMode: "desc" }));
+    expect(isProxy(saveEditorSettings.mock.calls[0][0])).toBe(false);
+
+    await store.persistEditorSettings();
+    expect(isProxy(saveEditorSettings.mock.calls[1][0])).toBe(false);
   });
 });
 
diff --git a/apps/desktop/src/stores/connectionStore.ts b/apps/desktop/src/stores/connectionStore.ts
index d91f54158..bef088bd4 100644
--- a/apps/desktop/src/stores/connectionStore.ts
+++ b/apps/desktop/src/stores/connectionStore.ts
@@ -9,9 +9,11 @@ import type {
   ConnectionConfig,
   DatabaseType,
   DatabaseConnectionInfo,
+  DatabaseStorageInfo,
   CatalogInfo,
   ForeignKeyInfo,
   ObjectInfo,
+  ObjectStatistics,
   SchemaInfo,
   SidebarLayout,
   TableInfo,
@@ -97,6 +99,7 @@ import { MetadataTaskLimiter } from "@/lib/metadata/metadataTaskLimiter";
 import i18n from "@/i18n";
 import type { MqAdminConfig } from "@/types/mq";
 import { RABBITMQ_MQ_TENANT, resolveMqSystemKindFromConnection } from "@/lib/mq/mqConsoleDefaults";
+import { applySidebarDatabaseStorage, applySidebarTableStorage, sidebarDatabaseNames, supportsSidebarDatabaseStorage, supportsSidebarTableStorage, type SidebarTableStorageScope } from "@/lib/sidebar/sidebarDatabaseStorage";
 
 const PINNED_TREE_NODES_STORAGE_KEY = "dbx-pinned-tree-nodes";
 const ACTIVE_CONNECTION_STORAGE_KEY = "dbx-active-connection";
@@ -108,6 +111,7 @@ const DISCONNECT_REQUEST_TIMEOUT_MS = 5_000;
 const DEFAULT_KEEPALIVE_INTERVAL_SECS = 30;
 const METADATA_LIST_PAGE_CACHE_TTL_MS = 30_000;
 const METADATA_LIST_PAGE_CACHE_MAX_ENTRIES = 160;
+const SIDEBAR_DATABASE_STORAGE_CACHE_TTL_MS = 30_000;
 export const COMPLETION_METADATA_CONCURRENCY = 2;
 const MONGO_LEGACY_DRIVER_PROFILE = "mongodb-legacy";
 const MONGO_LEGACY_DRIVER_LABEL = "MongoDB (Legacy)";
@@ -257,6 +261,10 @@ export const useConnectionStore = defineStore("connection", () => {
     else localStorage.removeItem(ACTIVE_CONNECTION_STORAGE_KEY);
   });
   const treeNodes = ref<TreeNode[]>([]);
+  const sidebarDatabaseStorageCache = new Map<string, { expiresAt: number; value: DatabaseStorageInfo[] }>();
+  const sidebarDatabaseStorageInFlight = new Map<string, Promise<DatabaseStorageInfo[]>>();
+  const sidebarTableStorageCache = new Map<string, { expiresAt: number; value: ObjectStatistics[] }>();
+  const sidebarTableStorageInFlight = new Map<string, Promise<ObjectStatistics[]>>();
   const pinnedTreeNodeIds = ref<Set<string>>(new Set());
   const connectedIds = ref<Set<string>>(new Set());
   const identifierQuotes = ref<Record<string, string>>({});
@@ -2263,6 +2271,104 @@ export const useConnectionStore = defineStore("connection", () => {
     beforeConnectHandler = handler;
   }
 
+  function sidebarDatabaseStorageRequestKey(connectionId: string, databases: readonly string[]): string {
+    return `${connectionId}\0${[...databases].sort().join("\0")}`;
+  }
+
+  async function loadSidebarDatabaseStorage(connectionId: string, options?: { force?: boolean }): Promise<void> {
+    if (settingsStore.editorSettings.sidebarObjectInfoMode !== "size" || !connectedIds.value.has(connectionId)) return;
+    if (!supportsSidebarDatabaseStorage(getConfig(connectionId))) return;
+    const connectionNode = findConnectionNode(connectionId);
+    const databases = sidebarDatabaseNames(connectionNode?.children);
+    if (!databases.length) return;
+
+    const requestKey = sidebarDatabaseStorageRequestKey(connectionId, databases);
+    const cached = sidebarDatabaseStorageCache.get(requestKey);
+    if (!options?.force && cached && cached.expiresAt > Date.now()) {
+      applySidebarDatabaseStorage(connectionNode?.children, cached.value);
+      return;
+    }
+
+    let request = sidebarDatabaseStorageInFlight.get(requestKey);
+    if (!request) {
+      request = api.listDatabaseStorage(connectionId, databases);
+      sidebarDatabaseStorageInFlight.set(requestKey, request);
+    }
+    try {
+      const storage = await request;
+      sidebarDatabaseStorageCache.set(requestKey, {
+        expiresAt: Date.now() + SIDEBAR_DATABASE_STORAGE_CACHE_TTL_MS,
+        value: storage,
+      });
+      const currentNode = findConnectionNode(connectionId);
+      const currentNames = sidebarDatabaseNames(currentNode?.children);
+      if (sidebarDatabaseStorageRequestKey(connectionId, currentNames) === requestKey) {
+        applySidebarDatabaseStorage(currentNode?.children, storage);
+      }
+    } catch (error) {
+      console.debug("[DBX][sidebar-database-storage:unavailable]", { connectionId, error });
+    } finally {
+      if (sidebarDatabaseStorageInFlight.get(requestKey) === request) {
+        sidebarDatabaseStorageInFlight.delete(requestKey);
+      }
+    }
+  }
+
+  function sidebarTableStorageRequestKey(scope: SidebarTableStorageScope): string {
+    return `${scope.connectionId}\0${scope.database}\0${scope.schema}`;
+  }
+
+  async function loadSidebarTableStorage(scope: SidebarTableStorageScope, options?: { force?: boolean }): Promise<void> {
+    if (settingsStore.editorSettings.sidebarObjectInfoMode !== "size" || !connectedIds.value.has(scope.connectionId)) return;
+    if (!supportsSidebarTableStorage(getConfig(scope.connectionId))) return;
+    const requestKey = sidebarTableStorageRequestKey(scope);
+    const cached = sidebarTableStorageCache.get(requestKey);
+    if (!options?.force && cached && cached.expiresAt > Date.now()) {
+      applySidebarTableStorage(treeNodes.value, scope, cached.value);
+      return;
+    }
+
+    let request = sidebarTableStorageInFlight.get(requestKey);
+    if (!request) {
+      request = api.listObjectStatistics(scope.connectionId, scope.database, scope.schema);
+      sidebarTableStorageInFlight.set(requestKey, request);
+    }
+    try {
+      const statistics = await request;
+      sidebarTableStorageCache.set(requestKey, {
+        expiresAt: Date.now() + SIDEBAR_DATABASE_STORAGE_CACHE_TTL_MS,
+        value: statistics,
+      });
+      applySidebarTableStorage(treeNodes.value, scope, statistics);
+    } catch (error) {
+      console.debug("[DBX][sidebar-table-storage:unavailable]", { ...scope, error });
+    } finally {
+      if (sidebarTableStorageInFlight.get(requestKey) === request) {
+        sidebarTableStorageInFlight.delete(requestKey);
+      }
+    }
+  }
+
+  const sidebarDatabaseStorageScope = computed(() => {
+    if (settingsStore.editorSettings.sidebarObjectInfoMode !== "size") return "";
+    return [...connectedIds.value]
+      .filter((connectionId) => supportsSidebarDatabaseStorage(getConfig(connectionId)))
+      .map((connectionId) => sidebarDatabaseStorageRequestKey(connectionId, sidebarDatabaseNames(findConnectionNode(connectionId)?.children)))
+      .sort()
+      .join("\n");
+  });
+
+  watch(
+    sidebarDatabaseStorageScope,
+    () => {
+      if (settingsStore.editorSettings.sidebarObjectInfoMode !== "size") return;
+      for (const connectionId of connectedIds.value) {
+        void loadSidebarDatabaseStorage(connectionId);
+      }
+    },
+    { flush: "post" },
+  );
+
   async function loadDatabases(connectionId: string, options?: LoadTreeOptions) {
     const configForScope = getConfig(connectionId);
     return runTreeMetadataLoad(
@@ -2410,6 +2516,7 @@ export const useConnectionStore = defineStore("connection", () => {
             }
           }
           node.isExpanded = true;
+          if (options?.force) void loadSidebarDatabaseStorage(connectionId, { force: true });
         } catch (e) {
           recordMetadataLoadError(connectionId, e);
           throw e;
@@ -5504,6 +5611,8 @@ export const useConnectionStore = defineStore("connection", () => {
     setBeforeConnectHandler,
     initFromDisk,
     loadDatabases,
+    loadSidebarDatabaseStorage,
+    loadSidebarTableStorage,
     loadRedisDatabases,
     refreshRedisDbKeyCounts,
     loadEtcdRoot,
diff --git a/apps/desktop/src/stores/settingsStore.ts b/apps/desktop/src/stores/settingsStore.ts
index c831a13b6..06f5543d5 100644
--- a/apps/desktop/src/stores/settingsStore.ts
+++ b/apps/desktop/src/stores/settingsStore.ts
@@ -376,6 +376,8 @@ export interface CustomTheme {
 
 export const DEFAULT_CUSTOM_THEMES: CustomTheme[] = [{ id: "default", name: "Custom", colors: { ...DEFAULT_CUSTOM_THEME_COLORS }, ddlColors: { ...DEFAULT_CUSTOM_THEME_DDL_COLORS } }];
 
+export type SidebarObjectInfoMode = "comment-inline" | "comment-aligned" | "size" | "hidden";
+
 export interface EditorSettings {
   fontFamily: string;
   fontSize: number;
@@ -438,7 +440,7 @@ export interface EditorSettings {
   prefillNewQueryWithSelect: boolean;
   updateNotificationsEnabled: boolean;
   sidebarHiddenTablePrefixes: string[];
-  sidebarHideTableComments: boolean;
+  sidebarObjectInfoMode: SidebarObjectInfoMode;
   sidebarAllowHorizontalScroll: boolean;
   columnFormatters: Record<string, ColumnFormatterConfig>;
   customColumnFormatters: Record<string, CustomColumnFormatterConfig>;
@@ -599,7 +601,7 @@ export const DEFAULT_EDITOR_SETTINGS: EditorSettings = {
   prefillNewQueryWithSelect: true,
   updateNotificationsEnabled: true,
   sidebarHiddenTablePrefixes: [],
-  sidebarHideTableComments: false,
+  sidebarObjectInfoMode: "comment-aligned",
   sidebarAllowHorizontalScroll: false,
   columnFormatters: {},
   customColumnFormatters: {},
@@ -711,6 +713,14 @@ function normalizeConnectionListSortMode(value: unknown): ConnectionListSortMode
   return value === "asc" || value === "desc" ? value : "manual";
 }
 
+function normalizeSidebarObjectInfoMode(value: unknown, legacyCommentLayout?: unknown, legacyHideTableComments?: unknown, legacyShowDatabaseSizes?: unknown): SidebarObjectInfoMode {
+  if (value === "comment-inline" || value === "comment-aligned" || value === "size" || value === "hidden") return value;
+  if (legacyCommentLayout === "hidden" || legacyHideTableComments === true) return "hidden";
+  if (legacyShowDatabaseSizes === true) return "size";
+  if (legacyCommentLayout === "aligned") return "comment-aligned";
+  return DEFAULT_EDITOR_SETTINGS.sidebarObjectInfoMode;
+}
+
 function normalizeColumnFormatters(value: unknown): Record<string, ColumnFormatterConfig> {
   if (!value || typeof value !== "object" || Array.isArray(value)) return {};
   const formatters: Record<string, ColumnFormatterConfig> = {};
@@ -861,7 +871,12 @@ export function normalizeEditorSettings(settings: Partial<EditorSettings>, exist
     prefillNewQueryWithSelect: typeof settings.prefillNewQueryWithSelect === "boolean" ? settings.prefillNewQueryWithSelect : DEFAULT_EDITOR_SETTINGS.prefillNewQueryWithSelect,
     updateNotificationsEnabled: settings.updateNotificationsEnabled ?? DEFAULT_EDITOR_SETTINGS.updateNotificationsEnabled,
     sidebarHiddenTablePrefixes: normalizeSidebarHiddenTablePrefixes(settings.sidebarHiddenTablePrefixes),
-    sidebarHideTableComments: settings.sidebarHideTableComments ?? DEFAULT_EDITOR_SETTINGS.sidebarHideTableComments,
+    sidebarObjectInfoMode: normalizeSidebarObjectInfoMode(
+      settings.sidebarObjectInfoMode,
+      (settings as Partial<EditorSettings> & { sidebarTableCommentLayout?: string }).sidebarTableCommentLayout,
+      (settings as Partial<EditorSettings> & { sidebarHideTableComments?: boolean }).sidebarHideTableComments,
+      (settings as Partial<EditorSettings> & { sidebarShowDatabaseSizes?: boolean }).sidebarShowDatabaseSizes,
+    ),
     sidebarAllowHorizontalScroll: settings.sidebarAllowHorizontalScroll ?? DEFAULT_EDITOR_SETTINGS.sidebarAllowHorizontalScroll,
     columnFormatters: normalizeColumnFormatters(settings.columnFormatters),
     customColumnFormatters: normalizeCustomColumnFormatters(settings.customColumnFormatters),
@@ -909,8 +924,12 @@ function clearLegacyEditorSettings() {
   safeLocalStorageRemove(EXPORT_BATCH_SIZE_DEFAULT_MIGRATION_KEY);
 }
 
+function editorSettingsSnapshot(settings: EditorSettings): EditorSettings {
+  return JSON.parse(JSON.stringify(settings)) as EditorSettings;
+}
+
 function saveEditorSettings(settings: EditorSettings) {
-  void api.saveEditorSettings(settings).catch(() => {});
+  void api.saveEditorSettings(editorSettingsSnapshot(settings)).catch(() => {});
 }
 
 export interface SettingsNavigationRequest {
@@ -1221,7 +1240,7 @@ export const useSettingsStore = defineStore("settings", () => {
     if (partial.prefillNewQueryWithSelect !== undefined) editorSettings.value.prefillNewQueryWithSelect = partial.prefillNewQueryWithSelect;
     if (partial.updateNotificationsEnabled !== undefined) editorSettings.value.updateNotificationsEnabled = partial.updateNotificationsEnabled;
     if (partial.sidebarHiddenTablePrefixes !== undefined) editorSettings.value.sidebarHiddenTablePrefixes = normalizeSidebarHiddenTablePrefixes(partial.sidebarHiddenTablePrefixes);
-    if (partial.sidebarHideTableComments !== undefined) editorSettings.value.sidebarHideTableComments = partial.sidebarHideTableComments;
+    if (partial.sidebarObjectInfoMode !== undefined) editorSettings.value.sidebarObjectInfoMode = normalizeSidebarObjectInfoMode(partial.sidebarObjectInfoMode);
     if (partial.sidebarAllowHorizontalScroll !== undefined) editorSettings.value.sidebarAllowHorizontalScroll = partial.sidebarAllowHorizontalScroll;
     if (partial.columnFormatters !== undefined) editorSettings.value.columnFormatters = partial.columnFormatters;
     if (partial.customColumnFormatters !== undefined) editorSettings.value.customColumnFormatters = partial.customColumnFormatters;
@@ -1243,6 +1262,10 @@ export const useSettingsStore = defineStore("settings", () => {
     saveEditorSettings(editorSettings.value);
   }
 
+  async function persistEditorSettings(): Promise<void> {
+    await api.saveEditorSettings(editorSettingsSnapshot(editorSettings.value));
+  }
+
   function updateColumnFormatter(key: string, formatter: ColumnFormatterConfig | undefined) {
     const columnFormatters = { ...editorSettings.value.columnFormatters };
     const normalized = normalizeColumnFormatter(formatter);
@@ -1300,6 +1323,7 @@ export const useSettingsStore = defineStore("settings", () => {
     mcpGlobalPolicy,
     initEditorSettings,
     updateEditorSettings,
+    persistEditorSettings,
     initDesktopSettings,
     updateDesktopSettings,
     initMcpGlobalPolicy,
diff --git a/apps/desktop/src/types/database.ts b/apps/desktop/src/types/database.ts
index 8cc41d2a2..9c8c7cc73 100644
--- a/apps/desktop/src/types/database.ts
+++ b/apps/desktop/src/types/database.ts
@@ -351,6 +351,11 @@ export interface DatabaseInfo {
   name: string;
 }
 
+export interface DatabaseStorageInfo {
+  name: string;
+  size_bytes: number | null;
+}
+
 export interface SchemaInfo {
   name: string;
   comment?: string | null;
@@ -714,6 +719,7 @@ export interface TreeNode {
   tableType?: string;
   comment?: string | null;
   valid?: boolean | null;
+  sizeBytes?: number | null;
   objectCount?: number;
   loadedKeyCount?: number;
   totalKeyCount?: number;
diff --git a/crates/dbx-core/src/db/postgres.rs b/crates/dbx-core/src/db/postgres.rs
index b8cde4d55..4ccd38379 100644
--- a/crates/dbx-core/src/db/postgres.rs
+++ b/crates/dbx-core/src/db/postgres.rs
@@ -26,8 +26,8 @@ use crate::sql::starts_with_executable_sql_keyword;
 use crate::types::{
     ColumnInfo, CompletionAssistantCandidate, CompletionAssistantCandidateKind, CompletionAssistantMatchMode,
     CompletionAssistantObjectKind, CompletionAssistantRequest, CompletionAssistantResponse, DatabaseInfo,
-    ExtensionInfo, ForeignKeyInfo, FunctionInfo, IndexInfo, ObjectInfo, ObjectStatistics, OwnerInfo, QueryResult,
-    RuleInfo, SchemaInfo, SequenceInfo, TableInfo, TriggerInfo,
+    DatabaseStorageInfo, ExtensionInfo, ForeignKeyInfo, FunctionInfo, IndexInfo, ObjectInfo, ObjectStatistics,
+    OwnerInfo, QueryResult, RuleInfo, SchemaInfo, SequenceInfo, TableInfo, TriggerInfo,
 };
 
 fn pg_temporal_to_json_value(row: &Row, idx: usize) -> Option<serde_json::Value> {
@@ -1542,21 +1542,53 @@ fn validate_postgres_ssl_paths(url: &str) -> Result<(), String> {
     postgres_connection_url(url).map(|_| ())
 }
 
+fn list_databases_sql() -> &'static str {
+    "SELECT datname FROM pg_database \
+     WHERE datallowconn = true \
+     ORDER BY datname"
+}
+
+fn database_storage_sql() -> &'static str {
+    "SELECT d.datname, \
+            CASE \
+              WHEN has_database_privilege(d.datname, 'CONNECT') \
+                OR COALESCE(( \
+                  SELECT pg_has_role(current_user, r.oid, 'MEMBER') \
+                  FROM pg_roles r \
+                  WHERE r.rolname = 'pg_read_all_stats' \
+                ), false) \
+              THEN pg_database_size(d.oid) \
+              ELSE NULL \
+            END AS size_bytes \
+     FROM pg_database d \
+     WHERE d.datallowconn = true \
+       AND d.datname = ANY($1::text[]) \
+     ORDER BY d.datname"
+}
+
 pub async fn list_databases(pool: &Pool) -> Result<Vec<DatabaseInfo>, String> {
     let client = checkout_postgres_client(pool, None, super::connection_timeout()).await?;
-    let rows = postgres_query_cached(
-        &client,
-        "SELECT datname FROM pg_database \
-         WHERE datallowconn = true \
-         ORDER BY datname",
-        &[],
-    )
-    .await
-    .map_err(|e| e.to_string())?;
+    let rows = postgres_query_cached(&client, list_databases_sql(), &[]).await.map_err(|e| e.to_string())?;
 
     Ok(rows.iter().map(|row| DatabaseInfo { name: pg_row_try_string(row, 0) }).collect())
 }
 
+pub async fn list_database_storage(pool: &Pool, database_names: &[String]) -> Result<Vec<DatabaseStorageInfo>, String> {
+    if database_names.is_empty() {
+        return Ok(Vec::new());
+    }
+    let client = checkout_postgres_client(pool, None, super::connection_timeout()).await?;
+    let rows =
+        postgres_query_cached(&client, database_storage_sql(), &[&database_names]).await.map_err(|e| e.to_string())?;
+    Ok(rows
+        .iter()
+        .map(|row| DatabaseStorageInfo {
+            name: pg_row_try_string(row, 0),
+            size_bytes: row.try_get::<_, Option<i64>>(1).ok().flatten(),
+        })
+        .collect())
+}
+
 pub async fn list_tables(pool: &Pool, schema: &str) -> Result<Vec<TableInfo>, String> {
     list_tables_filtered(pool, schema, None, None, None).await
 }
@@ -3579,6 +3611,22 @@ mod tests {
     use std::time::Instant;
     use tokio_postgres::types::FromSql;
 
+    #[test]
+    fn database_list_does_not_collect_storage_usage() {
+        assert!(list_databases_sql().contains("pg_database"));
+        assert!(!list_databases_sql().contains("pg_database_size"));
+    }
+
+    #[test]
+    fn database_storage_is_scoped_and_permission_guarded() {
+        let sql = database_storage_sql();
+        assert!(sql.contains("d.datname = ANY($1::text[])"));
+        assert!(sql.contains("has_database_privilege"));
+        assert!(sql.contains("pg_read_all_stats"));
+        assert!(sql.contains("pg_database_size"));
+        assert!(sql.contains("ELSE NULL"));
+    }
+
     #[test]
     fn classify_pg_type_covers_all_dispatch_branches() {
         assert_eq!(classify_pg_type("bytea"), PgColType::Bytea);
diff --git a/crates/dbx-core/src/schema.rs b/crates/dbx-core/src/schema.rs
index 788222702..c90d3eacb 100644
--- a/crates/dbx-core/src/schema.rs
+++ b/crates/dbx-core/src/schema.rs
@@ -653,6 +653,56 @@ pub async fn list_databases_core(state: &AppState, connection_id: &str) -> Resul
     retry_metadata_connection(state, connection_id, None, || list_databases_once(state, connection_id)).await
 }
 
+pub async fn list_database_storage_core(
+    state: &AppState,
+    connection_id: &str,
+    database_names: &[String],
+) -> Result<Vec<db::DatabaseStorageInfo>, String> {
+    const DATABASE_STORAGE_TIMEOUT: Duration = Duration::from_secs(5);
+    const MAX_DATABASE_STORAGE_NAMES: usize = 2048;
+
+    if database_names.is_empty() {
+        return Ok(Vec::new());
+    }
+    let config = connection_config(state, connection_id).await;
+    if !config.as_ref().is_some_and(|config| {
+        config.db_type == DatabaseType::Postgres && config.driver_profile.as_deref() != Some("cockroachdb")
+    }) {
+        return Ok(Vec::new());
+    }
+
+    let pool = {
+        let connections = state.connections.read().await;
+        match connections.get(connection_id) {
+            Some(PoolKind::Postgres(pool)) => pool.clone(),
+            _ => return Ok(Vec::new()),
+        }
+    };
+    let mut seen = std::collections::HashSet::new();
+    let requested = database_names
+        .iter()
+        .filter(|name| !name.is_empty() && seen.insert((*name).clone()))
+        .take(MAX_DATABASE_STORAGE_NAMES)
+        .cloned()
+        .collect::<Vec<_>>();
+    if requested.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    match tokio::time::timeout(DATABASE_STORAGE_TIMEOUT, db::postgres::list_database_storage(&pool, &requested)).await {
+        Ok(result) => result,
+        Err(_) => {
+            log::warn!(
+                "[list_database_storage:timeout] connection_id={} database_count={} timeout_ms={}",
+                connection_id,
+                requested.len(),
+                DATABASE_STORAGE_TIMEOUT.as_millis()
+            );
+            Ok(Vec::new())
+        }
+    }
+}
+
 pub async fn list_sqlserver_linked_servers_core(
     state: &AppState,
     connection_id: &str,
@@ -1573,6 +1623,91 @@ fn oracle_object_statistics_rows_only_sql(schema: &str) -> String {
     )
 }
 
+fn dameng_object_statistics_dba_segments_sql(schema: &str) -> String {
+    format!(
+        "SELECT t.TABLE_NAME, t.OWNER, t.NUM_ROWS, NVL(s.BYTES, 0) AS TOTAL_BYTES \
+         FROM ALL_TABLES t \
+         LEFT JOIN ( \
+           SELECT owner, table_name, SUM(bytes) AS BYTES \
+           FROM ( \
+             SELECT s.OWNER, s.SEGMENT_NAME AS TABLE_NAME, s.BYTES \
+             FROM DBA_SEGMENTS s \
+             WHERE s.OWNER = {} AND s.SEGMENT_TYPE IN ('TABLE','TABLE PARTITION','TABLE SUBPARTITION') \
+             UNION ALL \
+             SELECT i.TABLE_OWNER AS OWNER, i.TABLE_NAME, s.BYTES \
+             FROM ALL_INDEXES i \
+             JOIN DBA_SEGMENTS s ON s.OWNER = i.OWNER AND s.SEGMENT_NAME = i.INDEX_NAME \
+             WHERE i.TABLE_OWNER = {} AND s.SEGMENT_TYPE IN ('INDEX','INDEX PARTITION','INDEX SUBPARTITION') \
+           ) \
+           GROUP BY owner, table_name \
+         ) s ON s.OWNER = t.OWNER AND s.TABLE_NAME = t.TABLE_NAME \
+         WHERE t.OWNER = {} AND (t.NESTED IS NULL OR t.NESTED = 'NO') \
+         ORDER BY t.TABLE_NAME",
+        oracle_owner_filter(schema),
+        oracle_owner_filter(schema),
+        oracle_owner_filter(schema),
+    )
+}
+
+fn dameng_object_statistics_user_segments_sql(schema: &str) -> String {
+    format!(
+        "SELECT t.TABLE_NAME, t.OWNER, t.NUM_ROWS, NVL(s.BYTES, 0) AS TOTAL_BYTES \
+         FROM ALL_TABLES t \
+         LEFT JOIN ( \
+           SELECT table_name, SUM(bytes) AS BYTES \
+           FROM ( \
+             SELECT s.SEGMENT_NAME AS TABLE_NAME, s.BYTES \
+             FROM USER_SEGMENTS s \
+             WHERE s.SEGMENT_TYPE IN ('TABLE','TABLE PARTITION','TABLE SUBPARTITION') \
+             UNION ALL \
+             SELECT i.TABLE_NAME, s.BYTES \
+             FROM ALL_INDEXES i \
+             JOIN USER_SEGMENTS s ON s.SEGMENT_NAME = i.INDEX_NAME \
+             WHERE i.TABLE_OWNER = {} AND s.SEGMENT_TYPE IN ('INDEX','INDEX PARTITION','INDEX SUBPARTITION') \
+           ) \
+           GROUP BY table_name \
+         ) s ON s.TABLE_NAME = t.TABLE_NAME \
+         WHERE t.OWNER = {} AND t.OWNER = USER AND (t.NESTED IS NULL OR t.NESTED = 'NO') \
+         ORDER BY t.TABLE_NAME",
+        oracle_owner_filter(schema),
+        oracle_owner_filter(schema),
+    )
+}
+
+fn dameng_object_statistics_rows_only_sql(schema: &str) -> String {
+    format!(
+        "SELECT t.TABLE_NAME, t.OWNER, t.NUM_ROWS, CAST(NULL AS NUMBER) AS TOTAL_BYTES \
+         FROM ALL_TABLES t \
+         WHERE t.OWNER = {} AND (t.NESTED IS NULL OR t.NESTED = 'NO') \
+         ORDER BY t.TABLE_NAME",
+        oracle_owner_filter(schema),
+    )
+}
+
+fn kingbase_object_statistics_sql(schema: &str) -> String {
+    format!(
+        "SELECT c.relname, n.nspname, \
+                CAST(CASE WHEN c.reltuples < 0 THEN 0 ELSE c.reltuples END AS BIGINT) AS estimated_rows, \
+                CAST(sys_total_relation_size(c.oid) AS BIGINT) AS total_bytes \
+         FROM sys_catalog.sys_class c \
+         JOIN sys_catalog.sys_namespace n ON n.oid = c.relnamespace \
+         WHERE n.nspname = {} AND c.relkind IN ('r','m','f','p') \
+         ORDER BY c.relname",
+        sql_string(schema),
+    )
+}
+
+fn gbase8a_object_statistics_sql(database: &str) -> String {
+    format!(
+        "SELECT TABLE_NAME, TABLE_SCHEMA, TABLE_ROWS, \
+                COALESCE(DATA_LENGTH, 0) + COALESCE(INDEX_LENGTH, 0) AS TOTAL_BYTES \
+         FROM information_schema.TABLES \
+         WHERE TABLE_SCHEMA = {} AND TABLE_TYPE <> 'VIEW' \
+         ORDER BY TABLE_NAME",
+        sql_string(database),
+    )
+}
+
 fn query_result_cell_i64(row: &[serde_json::Value], index: usize) -> Option<i64> {
     let value = row.get(index)?;
     if value.is_null() {
@@ -1755,7 +1890,7 @@ async fn oracle_agent_list_object_statistics(
     ];
     let mut last_error = None;
     for (source, sql, accept_empty) in queries {
-        match oracle_agent_object_statistics_query(&mut client, database, schema, &sql, timeout_duration).await {
+        match agent_object_statistics_query(&mut client, database, schema, &sql, timeout_duration).await {
             Ok(result) if accept_empty || !result.rows.is_empty() => {
                 return Ok(oracle_object_statistics_from_query_result(result));
             }
@@ -1780,7 +1915,58 @@ async fn oracle_agent_list_object_statistics(
     Err(last_error.unwrap_or_else(|| "Oracle object statistics are unavailable".to_string()))
 }
 
-async fn oracle_agent_object_statistics_query(
+async fn dameng_agent_list_object_statistics(
+    client: Arc<tokio::sync::Mutex<db::agent_driver::AgentDriverClient>>,
+    database: &str,
+    schema: &str,
+    timeout_duration: Option<Duration>,
+) -> Result<Vec<db::ObjectStatistics>, String> {
+    let mut client = client.lock().await;
+    let queries = [
+        ("dba-segments", dameng_object_statistics_dba_segments_sql(schema), true),
+        ("user-segments", dameng_object_statistics_user_segments_sql(schema), false),
+        ("rows-only", dameng_object_statistics_rows_only_sql(schema), true),
+    ];
+    let mut last_error = None;
+    for (source, sql, accept_empty) in queries {
+        match agent_object_statistics_query(&mut client, database, schema, &sql, timeout_duration).await {
+            Ok(result) if accept_empty || !result.rows.is_empty() => {
+                return Ok(oracle_object_statistics_from_query_result(result));
+            }
+            Ok(_) => {
+                log::debug!(
+                    "[schema][dameng:list_object_statistics:empty-fallback] schema={} source={}",
+                    schema,
+                    source
+                );
+            }
+            Err(error) => {
+                log::debug!(
+                    "[schema][dameng:list_object_statistics:fallback-failed] schema={} source={} error={}",
+                    schema,
+                    source,
+                    error
+                );
+                last_error = Some(error);
+            }
+        }
+    }
+    Err(last_error.unwrap_or_else(|| "Dameng object statistics are unavailable".to_string()))
+}
+
+async fn agent_list_object_statistics(
+    client: Arc<tokio::sync::Mutex<db::agent_driver::AgentDriverClient>>,
+    database: &str,
+    schema: &str,
+    sql: String,
+    timeout_duration: Option<Duration>,
+) -> Result<Vec<db::ObjectStatistics>, String> {
+    let mut client = client.lock().await;
+    let result = agent_object_statistics_query(&mut client, database, schema, &sql, timeout_duration).await?;
+    Ok(oracle_object_statistics_from_query_result(result))
+}
+
+async fn agent_object_statistics_query(
     client: &mut db::agent_driver::AgentDriverClient,
     database: &str,
     schema: &str,
@@ -2453,11 +2639,13 @@ fn escape_presto_like_pattern(value: &str) -> String {
 mod tests {
     use super::db;
     use super::{
-        clickhouse_metadata_database, deduplicate_column_infos, filter_mysql_system_databases_for_config,
-        filter_object_infos, filter_table_infos, filter_visible_schema_names,
-        is_agent_postgres_metadata_fallback_config, is_retryable_metadata_error, mysql_object_source_sql,
-        mysql_table_metadata_catalog, normalize_information_schema_table_type, oracle_columns_from_query_result,
-        oracle_columns_sql, oracle_object_statistics_dba_segments_sql, oracle_object_statistics_from_query_result,
+        clickhouse_metadata_database, dameng_object_statistics_dba_segments_sql,
+        dameng_object_statistics_rows_only_sql, dameng_object_statistics_user_segments_sql, deduplicate_column_infos,
+        filter_mysql_system_databases_for_config, filter_object_infos, filter_table_infos, filter_visible_schema_names,
+        gbase8a_object_statistics_sql, is_agent_postgres_metadata_fallback_config, is_retryable_metadata_error,
+        kingbase_object_statistics_sql, mysql_object_source_sql, mysql_table_metadata_catalog,
+        normalize_information_schema_table_type, oracle_columns_from_query_result, oracle_columns_sql,
+        oracle_object_statistics_dba_segments_sql, oracle_object_statistics_from_query_result,
         oracle_object_statistics_rows_only_sql, oracle_object_statistics_sql,
         oracle_object_statistics_user_segments_sql, oracle_table_comment_from_query_result, oracle_table_comment_sql,
         oracle_table_comments_from_query_result, oracle_table_comments_sql, presto_like_columns_from_query_result,
@@ -3465,6 +3653,40 @@ mod tests {
         assert!(!rows_only_sql.contains("ALL_SEGMENTS"));
     }
 
+    #[test]
+    fn dameng_object_statistics_sql_uses_available_segment_views() {
+        let dba_sql = dameng_object_statistics_dba_segments_sql("app's");
+        assert!(dba_sql.contains("DBA_SEGMENTS"));
+        assert!(dba_sql.contains("ALL_INDEXES"));
+        assert!(!dba_sql.contains("ALL_SEGMENTS"));
+        assert!(!dba_sql.contains("ALL_LOBS"));
+        assert!(dba_sql.contains("OWNER = 'APP''S'"));
+        assert!(dba_sql.contains("t.NESTED IS NULL OR t.NESTED = 'NO'"));
+
+        let user_sql = dameng_object_statistics_user_segments_sql("app's");
+        assert!(user_sql.contains("USER_SEGMENTS"));
+        assert!(user_sql.contains("t.OWNER = USER"));
+
+        let rows_only_sql = dameng_object_statistics_rows_only_sql("app's");
+        assert!(rows_only_sql.contains("CAST(NULL AS NUMBER) AS TOTAL_BYTES"));
+        assert!(!rows_only_sql.contains("SEGMENTS"));
+    }
+
+    #[test]
+    fn agent_database_object_statistics_sql_uses_native_catalogs() {
+        let kingbase_sql = kingbase_object_statistics_sql("core's");
+        assert!(kingbase_sql.contains("sys_catalog.sys_class"));
+        assert!(kingbase_sql.contains("sys_catalog.sys_namespace"));
+        assert!(kingbase_sql.contains("sys_total_relation_size"));
+        assert!(kingbase_sql.contains("n.nspname = 'core''s'"));
+
+        let gbase_sql = gbase8a_object_statistics_sql("shop's");
+        assert!(gbase_sql.contains("information_schema.TABLES"));
+        assert!(gbase_sql.contains("DATA_LENGTH"));
+        assert!(gbase_sql.contains("INDEX_LENGTH"));
+        assert!(gbase_sql.contains("TABLE_SCHEMA = 'shop''s'"));
+    }
+
     #[test]
     fn oracle_object_statistics_from_query_result_maps_numbers() {
         let result = db::QueryResult {
@@ -3935,6 +4157,42 @@ async fn list_object_statistics_once(
             )
             .await;
         }
+        if db_config.as_ref().is_some_and(|config| config.db_type == DatabaseType::Dameng) {
+            drop(connections);
+            return dameng_agent_list_object_statistics(
+                client,
+                database,
+                schema,
+                agent_metadata_timeout(db_config.as_ref()),
+            )
+            .await;
+        }
+        if db_config.as_ref().is_some_and(|config| config.db_type == DatabaseType::Kingbase) {
+            let sql = kingbase_object_statistics_sql(schema);
+            drop(connections);
+            return agent_list_object_statistics(
+                client,
+                database,
+                schema,
+                sql,
+                agent_metadata_timeout(db_config.as_ref()),
+            )
+            .await;
+        }
+        if db_config.as_ref().is_some_and(|config| {
+            config.db_type == DatabaseType::Gbase && config.driver_profile.as_deref() != Some("gbase8s")
+        }) {
+            let sql = gbase8a_object_statistics_sql(database);
+            drop(connections);
+            return agent_list_object_statistics(
+                client,
+                database,
+                schema,
+                sql,
+                agent_metadata_timeout(db_config.as_ref()),
+            )
+            .await;
+        }
     }
     let pool = connections.get(&pool_key).ok_or("Pool not found")?;
     match pool {
diff --git a/crates/dbx-core/src/types.rs b/crates/dbx-core/src/types.rs
index 7515676d3..0367ac906 100644
--- a/crates/dbx-core/src/types.rs
+++ b/crates/dbx-core/src/types.rs
@@ -5,6 +5,12 @@ pub struct DatabaseInfo {
     pub name: String,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct DatabaseStorageInfo {
+    pub name: String,
+    pub size_bytes: Option<i64>,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SchemaInfo {
     pub name: String,
diff --git a/crates/dbx-web/src/main.rs b/crates/dbx-web/src/main.rs
index 11d62f81b..855057ac9 100644
--- a/crates/dbx-web/src/main.rs
+++ b/crates/dbx-web/src/main.rs
@@ -278,6 +278,7 @@ async fn main() {
         .route("/agents/progress/{operationId}", get(routes::agents::agent_progress))
         // Schema
         .route("/schema/databases", get(routes::schema::list_databases))
+        .route("/schema/database-storage", post(routes::schema::list_database_storage))
         .route("/schema/doris/catalogs", get(routes::schema::list_doris_catalogs))
         .route("/schema/doris/catalog-databases", get(routes::schema::list_doris_catalog_databases))
         .route("/schema/sqlserver/linked-servers", get(routes::schema::list_sqlserver_linked_servers))
diff --git a/crates/dbx-web/src/routes/schema.rs b/crates/dbx-web/src/routes/schema.rs
index 5bebf8c86..cb3dc0cd9 100644
--- a/crates/dbx-web/src/routes/schema.rs
+++ b/crates/dbx-web/src/routes/schema.rs
@@ -25,6 +25,12 @@ pub struct SchemaQuery {
     pub client_session_id: Option<String>,
 }
 
+#[derive(Deserialize)]
+pub struct DatabaseStorageRequest {
+    pub connection_id: String,
+    pub databases: Vec<String>,
+}
+
 pub async fn list_databases(
     State(state): State<Arc<WebState>>,
     Query(q): Query<SchemaQuery>,
@@ -33,6 +39,16 @@ pub async fn list_databases(
     Ok(Json(serde_json::to_value(result).map_err(|e| AppError::from(e.to_string()))?))
 }
 
+pub async fn list_database_storage(
+    State(state): State<Arc<WebState>>,
+    Json(request): Json<DatabaseStorageRequest>,
+) -> Result<Json<Vec<dbx_core::db::DatabaseStorageInfo>>, AppError> {
+    let result = dbx_core::schema::list_database_storage_core(&state.app, &request.connection_id, &request.databases)
+        .await
+        .map_err(AppError::from)?;
+    Ok(Json(result))
+}
+
 /// Resolve a non-internal catalog for dispatch to the Doris multi-catalog path.
 async fn external_doris_catalog(state: &Arc<WebState>, connection_id: &str, catalog: Option<&str>) -> Option<String> {
     dbx_core::schema::resolve_external_doris_catalog(&state.app, connection_id, catalog).await
diff --git a/src-tauri/src/commands/schema.rs b/src-tauri/src/commands/schema.rs
index 19a5c2242..e3700d9ad 100644
--- a/src-tauri/src/commands/schema.rs
+++ b/src-tauri/src/commands/schema.rs
@@ -19,6 +19,15 @@ pub async fn list_databases(
     dbx_core::schema::list_databases_core(&state, &connection_id).await
 }
 
+#[tauri::command]
+pub async fn list_database_storage(
+    state: State<'_, Arc<AppState>>,
+    connection_id: String,
+    databases: Vec<String>,
+) -> Result<Vec<db::DatabaseStorageInfo>, String> {
+    dbx_core::schema::list_database_storage_core(&state, &connection_id, &databases).await
+}
+
 #[tauri::command]
 pub async fn list_doris_catalogs(
     state: State<'_, Arc<AppState>>,
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 860e0732f..246c3bef8 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -1145,6 +1145,7 @@ pub fn run() {
             commands::plugins::install_jdbc_plugin_local,
             commands::plugins::uninstall_jdbc_plugin,
             commands::schema::list_databases,
+            commands::schema::list_database_storage,
             commands::schema::list_doris_catalogs,
             commands::schema::list_doris_catalog_databases,
             commands::schema::list_sqlserver_linked_servers,