diff --git a/src/components/editor/AiAssistant.vue b/src/components/editor/AiAssistant.vue
index 2585b80792..7f0ab159f1 100644
--- a/src/components/editor/AiAssistant.vue
+++ b/src/components/editor/AiAssistant.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, nextTick, onMounted, ref } from "vue";
+import { computed, nextTick, onMounted, onUnmounted, ref } from "vue";
 import { uuid } from "@/lib/utils";
 import { useI18n } from "vue-i18n";
 import { translateBackendError } from "@/i18n/backend-errors";
@@ -17,6 +17,7 @@ import {
   MessageSquarePlus,
   Replace,
   Server,
+  Table2,
   Play,
   Square,
   Trash2,
@@ -50,12 +51,16 @@ import {
   saveAiConversation,
   loadAiConversations,
   deleteAiConversation,
+  listSchemas,
+  listTables,
   type AiConversation,
 } from "@/lib/api";
 import type { AiMessage } from "@/lib/api";
-import type { ConnectionConfig, QueryTab } from "@/types/database";
+import type { ConnectionConfig, QueryTab, TableInfo } from "@/types/database";
 import { useDatabaseOptions } from "@/composables/useDatabaseOptions";
 import { resolveDefaultDatabase } from "@/lib/defaultDatabase";
+import { isSchemaAware } from "@/lib/databaseCapabilities";
+import { formatAiTableMention, parseAiTableMentions, type AiTableMention } from "@/lib/aiTableMentions";
 
 const { t } = useI18n();
 const settings = useSettingsStore();
@@ -87,10 +92,29 @@ const messages = ref<ChatMessage[]>([]);
 const isGenerating = ref(false);
 const scrollRef = ref<InstanceType<typeof ScrollArea> | null>(null);
 const activeAction = ref<AiAction>("generate");
+const assistantMode = ref<"ask" | "agent">("ask");
 const currentSessionId = ref("");
 const conversationId = ref("");
 const conversations = ref<AiConversation[]>([]);
 const showConversationList = ref(false);
+const promptTextareaRef = ref<HTMLTextAreaElement | null>(null);
+
+interface AiMentionCandidate {
+  schema?: string;
+  name: string;
+  tableType: string;
+}
+
+const mentionOpen = ref(false);
+const mentionLoading = ref(false);
+const mentionError = ref("");
+const mentionStart = ref(0);
+const mentionSelectedIndex = ref(0);
+const mentionCandidates = ref<AiMentionCandidate[]>([]);
+const mentionCache = ref<Record<string, AiMentionCandidate[]>>({});
+const selectedMentions = ref<AiTableMention[]>([]);
+let mentionTimer: ReturnType<typeof setTimeout> | undefined;
+let mentionRequestId = 0;
 
 const actionButtons: { action: AiAction; icon: any; key: string }[] = [
   { action: "generate", icon: Wand2, key: "ai.actions.generate" },
@@ -117,12 +141,17 @@ const chatTitle = computed(() => {
   return first ? first.content.slice(0, 30) : t("ai.newChat");
 });
 
+const promptMentionChips = computed(() => selectedMentions.value);
+
 const isWaitingForFirstDelta = computed(() => {
   const last = messages.value[messages.value.length - 1];
   return isGenerating.value && last?.role === "assistant" && !last.content && !last.reasoning;
 });
 
-const activePlaceholder = computed(() => t(`ai.placeholders.${activeAction.value}`));
+const activePlaceholder = computed(
+  () => `${t(`ai.placeholders.${activeAction.value}`)} ${t("ai.tableMentionPlaceholderHint")}`,
+);
+const activeModeHint = computed(() => t(`ai.modeHints.${assistantMode.value}`));
 
 const { databaseOptions: allDbOptions, loadDatabaseOptions } = useDatabaseOptions();
 
@@ -201,9 +230,208 @@ function scrollToBottom() {
   });
 }
 
+function mentionCacheKey(connectionId: string, database: string, query: string) {
+  return `${connectionId}:${database}:${query.toLowerCase()}`;
+}
+
+function mentionSchemaOrder(schemas: string[]): string[] {
+  const currentSchema = props.tab?.tableMeta?.schema;
+  const preferred = [currentSchema, "public", "dbo", "main"].filter((value): value is string => !!value);
+  return [...schemas].sort((a, b) => {
+    const ai = preferred.indexOf(a);
+    const bi = preferred.indexOf(b);
+    if (ai >= 0 || bi >= 0) return (ai >= 0 ? ai : 99) - (bi >= 0 ? bi : 99);
+    return a.localeCompare(b);
+  });
+}
+
+function activeMentionAtCursor(): { start: number; query: string } | null {
+  const textarea = promptTextareaRef.value;
+  const cursor = textarea?.selectionStart ?? prompt.value.length;
+  const beforeCursor = prompt.value.slice(0, cursor);
+  const match = /(^|[\s([{,;:])@([^\s]*)$/.exec(beforeCursor);
+  if (!match) return null;
+  return { start: beforeCursor.length - match[2].length - 1, query: match[2] };
+}
+
+function normalizeMentionQuery(query: string): { schemaPrefix: string; tableFilter: string } {
+  const clean = query.replace(/^["`]+|["`]+$/g, "");
+  const dot = clean.lastIndexOf(".");
+  if (dot < 0) return { schemaPrefix: "", tableFilter: clean };
+  return {
+    schemaPrefix: clean.slice(0, dot).replace(/^["`]+|["`]+$/g, ""),
+    tableFilter: clean.slice(dot + 1).replace(/^["`]+|["`]+$/g, ""),
+  };
+}
+
+async function loadMentionCandidates(query: string) {
+  if (!props.connection || !props.tab?.connectionId || !props.tab.database) return;
+
+  const key = mentionCacheKey(props.tab.connectionId, props.tab.database, query);
+  if (mentionCache.value[key]) {
+    mentionCandidates.value = mentionCache.value[key];
+    return;
+  }
+
+  const requestId = ++mentionRequestId;
+  mentionLoading.value = true;
+  mentionError.value = "";
+  const { schemaPrefix, tableFilter } = normalizeMentionQuery(query);
+
+  try {
+    await connectionStore.ensureConnected(props.tab.connectionId);
+    let candidates: AiMentionCandidate[] = [];
+    if (isSchemaAware(props.connection.db_type)) {
+      const schemas = mentionSchemaOrder(await listSchemas(props.tab.connectionId, props.tab.database));
+      const filteredSchemas = schemaPrefix
+        ? schemas.filter((schema) => schema.toLowerCase().includes(schemaPrefix.toLowerCase()))
+        : schemas;
+      const results = await Promise.all(
+        filteredSchemas.slice(0, 8).map(async (schema) => {
+          const tables = await listTables(
+            props.tab!.connectionId,
+            props.tab!.database,
+            schema,
+            tableFilter || undefined,
+            20,
+          );
+          return filterMentionCandidates(
+            tables.map((table) => mentionCandidateFromTable(table, schema)),
+            tableFilter,
+            20,
+          );
+        }),
+      );
+      candidates = results.flat();
+    } else {
+      const schema = props.tab.database || props.connection.database || "main";
+      const tables = await listTables(props.tab.connectionId, props.tab.database, schema, tableFilter || undefined, 40);
+      candidates = filterMentionCandidates(
+        tables.map((table) => mentionCandidateFromTable(table)),
+        tableFilter,
+        40,
+      );
+    }
+
+    if (requestId !== mentionRequestId) return;
+    mentionCache.value[key] = candidates.slice(0, 40);
+    mentionCandidates.value = mentionCache.value[key];
+    mentionSelectedIndex.value = 0;
+  } catch (e: any) {
+    if (requestId !== mentionRequestId) return;
+    mentionError.value = translateBackendError(t, e?.message || String(e));
+    mentionCandidates.value = [];
+  } finally {
+    if (requestId === mentionRequestId) mentionLoading.value = false;
+  }
+}
+
+function mentionCandidateFromTable(table: TableInfo, schema?: string): AiMentionCandidate {
+  return { schema, name: table.name, tableType: table.table_type };
+}
+
+function mentionDisplayName(mention: AiTableMention) {
+  return [mention.schema, mention.table].filter(Boolean).join(".");
+}
+
+function removeMentionChip(mention: AiTableMention) {
+  selectedMentions.value = selectedMentions.value.filter((item) => item.raw !== mention.raw);
+  nextTick(() => promptTextareaRef.value?.focus());
+}
+
+function addSelectedMention(candidate: AiMentionCandidate) {
+  const raw = formatAiTableMention(candidate.schema, candidate.name);
+  const key = `${candidate.schema || ""}.${candidate.name}`.toLowerCase();
+  if (selectedMentions.value.some((mention) => `${mention.schema || ""}.${mention.table}`.toLowerCase() === key))
+    return;
+  selectedMentions.value.push({ raw, schema: candidate.schema, table: candidate.name });
+}
+
+function formatMentionTableType(tableType: string) {
+  const normalized = tableType.toUpperCase().replace(/\s+/g, "_");
+  if (normalized.includes("VIEW")) return t("ai.tableMentionTypes.view");
+  if (normalized.includes("SYSTEM")) return t("ai.tableMentionTypes.systemTable");
+  if (normalized.includes("TEMP")) return t("ai.tableMentionTypes.temporaryTable");
+  return t("ai.tableMentionTypes.table");
+}
+
+function filterMentionCandidates(
+  candidates: AiMentionCandidate[],
+  tableFilter: string,
+  limit: number,
+): AiMentionCandidate[] {
+  const normalizedFilter = tableFilter.toLowerCase();
+  return candidates
+    .filter((candidate) => !normalizedFilter || candidate.name.toLowerCase().includes(normalizedFilter))
+    .slice(0, limit);
+}
+
+function refreshMentionState() {
+  clearTimeout(mentionTimer);
+  const mention = activeMentionAtCursor();
+  if (!mention || !props.connection || !props.tab?.database || isGenerating.value) {
+    mentionOpen.value = false;
+    return;
+  }
+
+  mentionOpen.value = true;
+  mentionStart.value = mention.start;
+  mentionTimer = setTimeout(() => {
+    loadMentionCandidates(mention.query).catch(() => {});
+  }, 120);
+}
+
+function insertMention(candidate: AiMentionCandidate) {
+  const textarea = promptTextareaRef.value;
+  const cursor = textarea?.selectionStart ?? prompt.value.length;
+  const before = prompt.value.slice(0, mentionStart.value);
+  const after = prompt.value.slice(cursor);
+  addSelectedMention(candidate);
+  prompt.value = `${before}${after}`.replace(/\s{2,}/g, " ");
+  mentionOpen.value = false;
+  nextTick(() => {
+    const nextCursor = before.length;
+    promptTextareaRef.value?.focus();
+    promptTextareaRef.value?.setSelectionRange(nextCursor, nextCursor);
+  });
+}
+
+function onPromptKeydown(event: KeyboardEvent) {
+  if (mentionOpen.value) {
+    if (event.key === "ArrowDown") {
+      event.preventDefault();
+      mentionSelectedIndex.value = Math.min(
+        mentionSelectedIndex.value + 1,
+        Math.max(mentionCandidates.value.length - 1, 0),
+      );
+      return;
+    }
+    if (event.key === "ArrowUp") {
+      event.preventDefault();
+      mentionSelectedIndex.value = Math.max(mentionSelectedIndex.value - 1, 0);
+      return;
+    }
+    if ((event.key === "Enter" || event.key === "Tab") && mentionCandidates.value[mentionSelectedIndex.value]) {
+      event.preventDefault();
+      insertMention(mentionCandidates.value[mentionSelectedIndex.value]);
+      return;
+    }
+    if (event.key === "Escape") {
+      event.preventDefault();
+      mentionOpen.value = false;
+      return;
+    }
+  }
+
+  if (event.key === "Enter" && !event.shiftKey && !event.isComposing) {
+    event.preventDefault();
+    send();
+  }
+}
+
 async function send() {
   const text = prompt.value.trim();
-  if (!text || isGenerating.value) return;
+  if ((!text && !selectedMentions.value.length) || isGenerating.value) return;
 
   if (!props.connection || !props.tab) return;
   if (!settings.isConfigured()) {
@@ -211,19 +439,25 @@ async function send() {
     return;
   }
 
-  messages.value.push({ role: "user", content: text });
+  const mentionedTables = [...selectedMentions.value, ...parseAiTableMentions(text)];
+  const displayText = [selectedMentions.value.map((mention) => mention.raw).join(" "), text].filter(Boolean).join(" ");
+
+  messages.value.push({ role: "user", content: displayText });
   prompt.value = "";
+  selectedMentions.value = [];
   scrollToBottom();
 
   const requestedAction = activeAction.value;
-  const shouldAutoExecute = shouldAttemptAiAutoExecute(text, requestedAction);
+  const shouldAutoExecute = assistantMode.value === "agent" && shouldAttemptAiAutoExecute(displayText, requestedAction);
   isGenerating.value = true;
   messages.value.push({ role: "assistant", content: "" });
   const assistantIdx = messages.value.length - 1;
   const sessionId = uuid();
   currentSessionId.value = sessionId;
   try {
-    const context = await buildAiContext(props.tab, props.connection);
+    const context = await buildAiContext(props.tab, props.connection, {
+      mentionedTables,
+    });
     const history: AiMessage[] = messages.value.slice(0, -2).map((m) => ({
       role: m.role,
       content: m.content,
@@ -232,7 +466,7 @@ async function send() {
       {
         config: settings.aiConfig,
         action: activeAction.value,
-        instruction: text,
+        instruction: displayText,
         context,
       },
       history,
@@ -340,6 +574,10 @@ onMounted(async () => {
   conversations.value = await loadAiConversations().catch(() => []);
 });
 
+onUnmounted(() => {
+  clearTimeout(mentionTimer);
+});
+
 function triggerAction(action: AiAction, instruction?: string) {
   activeAction.value = action;
   if (instruction) prompt.value = instruction;
@@ -557,7 +795,7 @@ function formatInlineText(text: string): string {
     </ScrollArea>
 
     <div class="p-2">
-      <div class="rounded-lg border bg-background px-2 pb-2 pt-1">
+      <div class="relative rounded-lg border bg-background px-2 pb-2 pt-1">
         <div v-if="connectionStore.connections.length" class="flex items-center gap-1 mb-1 text-xs text-foreground/80">
           <DatabaseIcon v-if="connection" :db-type="connectionIconType(connection)" class="h-3 w-3 shrink-0" />
           <Server v-else class="h-3 w-3 shrink-0" />
@@ -605,15 +843,104 @@ function formatInlineText(text: string): string {
             </Select>
           </template>
         </div>
+        <div
+          v-if="mentionOpen"
+          class="absolute bottom-full left-2 right-2 z-20 mb-1 max-h-56 overflow-hidden rounded-md border bg-popover text-popover-foreground shadow-md"
+        >
+          <div v-if="mentionLoading" class="flex items-center gap-2 px-2 py-2 text-xs text-muted-foreground">
+            <Loader2 class="h-3.5 w-3.5 animate-spin" />
+            <span>{{ t("common.loading") }}</span>
+          </div>
+          <div v-else-if="mentionError" class="px-2 py-2 text-xs text-destructive">
+            {{ mentionError }}
+          </div>
+          <div v-else-if="!mentionCandidates.length" class="px-2 py-2 text-xs text-muted-foreground">
+            {{ t("ai.tableMentionEmpty") }}
+          </div>
+          <div v-else class="max-h-56 overflow-auto p-1">
+            <button
+              v-for="(candidate, index) in mentionCandidates"
+              :key="`${candidate.schema || ''}.${candidate.name}`"
+              type="button"
+              class="flex w-full min-w-0 items-center gap-2 rounded px-2 py-1.5 text-left text-xs hover:bg-muted"
+              :class="{ 'bg-muted': index === mentionSelectedIndex }"
+              @mousedown.prevent="insertMention(candidate)"
+              @mouseenter="mentionSelectedIndex = index"
+            >
+              <Table2 class="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
+              <span class="min-w-0 flex-1 truncate">
+                <template v-if="candidate.schema">{{ candidate.schema }}.</template>{{ candidate.name }}
+              </span>
+              <span class="shrink-0 text-[10px] text-muted-foreground">{{
+                formatMentionTableType(candidate.tableType)
+              }}</span>
+            </button>
+          </div>
+        </div>
+        <div v-if="promptMentionChips.length" class="mb-1.5 flex flex-wrap gap-1">
+          <button
+            v-for="mention in promptMentionChips"
+            :key="mention.raw"
+            type="button"
+            class="group inline-flex max-w-full items-center gap-1 rounded border border-border/80 bg-muted/60 px-1.5 py-0.5 text-[11px] text-foreground/90 hover:bg-muted"
+            :title="mentionDisplayName(mention)"
+            @click="removeMentionChip(mention)"
+          >
+            <Table2 class="h-3 w-3 shrink-0 text-primary" />
+            <span class="truncate">{{ mentionDisplayName(mention) }}</span>
+            <X class="h-3 w-3 shrink-0 text-muted-foreground group-hover:text-foreground" />
+          </button>
+        </div>
         <textarea
+          ref="promptTextareaRef"
           v-model="prompt"
           rows="3"
           class="w-full resize-none bg-transparent text-xs outline-none placeholder:text-muted-foreground mb-1"
           :placeholder="activePlaceholder"
           :disabled="isGenerating"
-          @keydown.enter.exact="send"
+          @input="refreshMentionState"
+          @click="refreshMentionState"
+          @keyup="refreshMentionState"
+          @keydown="onPromptKeydown"
         />
         <div class="flex items-center gap-1.5">
+          <DropdownMenu>
+            <DropdownMenuTrigger as-child>
+              <button
+                class="flex items-center gap-1 rounded-full border px-2 py-0.5 text-[11px] text-muted-foreground hover:bg-muted hover:text-foreground"
+                :title="activeModeHint"
+              >
+                <Bot class="h-3 w-3" />
+                <span>{{ t(`ai.modes.${assistantMode}`) }}</span>
+                <svg
+                  class="h-3 w-3 opacity-50"
+                  xmlns="http://www.w3.org/2000/svg"
+                  viewBox="0 0 24 24"
+                  fill="none"
+                  stroke="currentColor"
+                  stroke-width="2"
+                  stroke-linecap="round"
+                  stroke-linejoin="round"
+                >
+                  <path d="m6 9 6 6 6-6" />
+                </svg>
+              </button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="start" class="w-40">
+              <DropdownMenuItem class="text-xs gap-1.5" :title="t('ai.modeHints.ask')" @click="assistantMode = 'ask'">
+                <Check class="h-3 w-3" :class="{ 'opacity-0': assistantMode !== 'ask' }" />
+                <span>{{ t("ai.modes.ask") }}</span>
+              </DropdownMenuItem>
+              <DropdownMenuItem
+                class="text-xs gap-1.5"
+                :title="t('ai.modeHints.agent')"
+                @click="assistantMode = 'agent'"
+              >
+                <Check class="h-3 w-3" :class="{ 'opacity-0': assistantMode !== 'agent' }" />
+                <span>{{ t("ai.modes.agent") }}</span>
+              </DropdownMenuItem>
+            </DropdownMenuContent>
+          </DropdownMenu>
           <DropdownMenu>
             <DropdownMenuTrigger as-child>
               <button
diff --git a/src/components/grid/DataGrid.vue b/src/components/grid/DataGrid.vue
index 7258a8057e..0686724ce6 100644
--- a/src/components/grid/DataGrid.vue
+++ b/src/components/grid/DataGrid.vue
@@ -4,7 +4,7 @@ const globalDdlOpen = ref(false);
 </script>
 
 <script setup lang="ts">
-import { computed, nextTick, onUnmounted, watch } from "vue";
+import { computed, nextTick, onUnmounted, watch, type Component } from "vue";
 import { useI18n } from "vue-i18n";
 import {
   ArrowUp,
@@ -38,6 +38,10 @@ import {
   SquareDashed,
   Check,
   CopyPlus,
+  KeyRound,
+  Link2,
+  ListTree,
+  TableProperties,
 } from "lucide-vue-next";
 import { Button } from "@/components/ui/button";
 import {
@@ -60,7 +64,7 @@ import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
 import DangerConfirmDialog from "@/components/editor/DangerConfirmDialog.vue";
-import type { QueryResult, ColumnInfo, DatabaseType } from "@/types/database";
+import type { QueryResult, ColumnInfo, DatabaseType, ForeignKeyInfo, IndexInfo, TriggerInfo } from "@/types/database";
 import * as api from "@/lib/api";
 import {
   buildTableSelectSql,
@@ -1813,7 +1817,10 @@ function onRowContext(rowId: number, rowIndex: number) {
 
 const sqlOneLiner = computed(() => props.sql?.replace(/\s+/g, " ").trim() || "");
 
-const showDdl = globalDdlOpen;
+type TableInfoTab = "columns" | "indexes" | "foreignKeys" | "triggers" | "ddl";
+
+const showTableInfo = globalDdlOpen;
+const activeTableInfoTab = ref<TableInfoTab>("columns");
 const ddlContent = ref("");
 const ddlLoading = ref(false);
 const ddlWidth = ref(320);
@@ -1821,22 +1828,64 @@ const ddlWrap = ref(true);
 const isResizingDdl = ref(false);
 let ddlResizeStartX = 0;
 let ddlResizeStartWidth = 0;
+const indexes = ref<IndexInfo[]>([]);
+const indexesLoaded = ref(false);
+const indexesLoading = ref(false);
+const indexesError = ref("");
+const foreignKeys = ref<ForeignKeyInfo[]>([]);
+const foreignKeysLoaded = ref(false);
+const foreignKeysLoading = ref(false);
+const foreignKeysError = ref("");
+const triggers = ref<TriggerInfo[]>([]);
+const triggersLoaded = ref(false);
+const triggersLoading = ref(false);
+const triggersError = ref("");
 
 const ddlDrawerStyle = computed(() => ({
   width: `${ddlWidth.value}px`,
 }));
 
-async function toggleDdl() {
-  if (showDdl.value) {
-    showDdl.value = false;
+const tableInfoTabs = computed(
+  () =>
+    [
+      {
+        id: "columns" as const,
+        label: t("grid.tableInfoColumns"),
+        icon: ListTree,
+        count: props.tableMeta?.columns.length,
+      },
+      { id: "indexes" as const, label: t("grid.tableInfoIndexes"), icon: KeyRound, count: indexes.value.length },
+      {
+        id: "foreignKeys" as const,
+        label: t("grid.tableInfoForeignKeys"),
+        icon: Link2,
+        count: foreignKeys.value.length,
+      },
+      { id: "triggers" as const, label: t("grid.tableInfoTriggers"), icon: RotateCcw, count: triggers.value.length },
+      { id: "ddl" as const, label: "DDL", icon: Code2 },
+    ] satisfies Array<{ id: TableInfoTab; label: string; icon: Component; count?: number }>,
+);
+
+async function toggleTableInfo(tab: TableInfoTab = activeTableInfoTab.value) {
+  if (showTableInfo.value && activeTableInfoTab.value === tab) {
+    showTableInfo.value = false;
     return;
   }
-  await fetchDdl();
+  showTableInfo.value = true;
+  await selectTableInfoTab(tab);
+}
+
+async function selectTableInfoTab(tab: TableInfoTab) {
+  activeTableInfoTab.value = tab;
+  if (tab === "ddl") await fetchDdl();
+  else if (tab === "indexes") await fetchIndexes();
+  else if (tab === "foreignKeys") await fetchForeignKeys();
+  else if (tab === "triggers") await fetchTriggers();
 }
 
 async function fetchDdl() {
   if (!props.connectionId || !props.tableMeta) return;
-  showDdl.value = true;
+  showTableInfo.value = true;
   ddlLoading.value = true;
   try {
     ddlContent.value = await api.getTableDdl(
@@ -1852,8 +1901,82 @@ async function fetchDdl() {
   }
 }
 
-if (showDdl.value && props.tableMeta && props.connectionId) {
-  fetchDdl();
+async function fetchIndexes() {
+  if (!props.connectionId || !props.tableMeta || indexesLoaded.value || indexesLoading.value) return;
+  indexesLoading.value = true;
+  indexesError.value = "";
+  try {
+    indexes.value = await api.listIndexes(
+      props.connectionId,
+      props.database || "",
+      props.tableMeta.schema || props.database || "",
+      props.tableMeta.tableName,
+    );
+    indexesLoaded.value = true;
+  } catch (e: any) {
+    indexesError.value = String(e?.message || e);
+  } finally {
+    indexesLoading.value = false;
+  }
+}
+
+async function fetchForeignKeys() {
+  if (!props.connectionId || !props.tableMeta || foreignKeysLoaded.value || foreignKeysLoading.value) return;
+  foreignKeysLoading.value = true;
+  foreignKeysError.value = "";
+  try {
+    foreignKeys.value = await api.listForeignKeys(
+      props.connectionId,
+      props.database || "",
+      props.tableMeta.schema || props.database || "",
+      props.tableMeta.tableName,
+    );
+    foreignKeysLoaded.value = true;
+  } catch (e: any) {
+    foreignKeysError.value = String(e?.message || e);
+  } finally {
+    foreignKeysLoading.value = false;
+  }
+}
+
+async function fetchTriggers() {
+  if (!props.connectionId || !props.tableMeta || triggersLoaded.value || triggersLoading.value) return;
+  triggersLoading.value = true;
+  triggersError.value = "";
+  try {
+    triggers.value = await api.listTriggers(
+      props.connectionId,
+      props.database || "",
+      props.tableMeta.schema || props.database || "",
+      props.tableMeta.tableName,
+    );
+    triggersLoaded.value = true;
+  } catch (e: any) {
+    triggersError.value = String(e?.message || e);
+  } finally {
+    triggersLoading.value = false;
+  }
+}
+
+watch(
+  () => [props.connectionId, props.database, props.tableMeta?.schema, props.tableMeta?.tableName],
+  () => {
+    ddlContent.value = "";
+    indexes.value = [];
+    indexesLoaded.value = false;
+    indexesError.value = "";
+    foreignKeys.value = [];
+    foreignKeysLoaded.value = false;
+    foreignKeysError.value = "";
+    triggers.value = [];
+    triggersLoaded.value = false;
+    triggersError.value = "";
+    if (showTableInfo.value) selectTableInfoTab(activeTableInfoTab.value);
+  },
+);
+
+if (showTableInfo.value && props.tableMeta && props.connectionId) {
+  selectTableInfoTab(activeTableInfoTab.value);
 }
 
 function copyDdl() {
@@ -1949,8 +2072,10 @@ defineExpose({
   onToolbarRefresh,
   onToolbarCommit,
   onToolbarRollback,
-  showDdl,
-  toggleDdl,
+  showDdl: showTableInfo,
+  toggleDdl: toggleTableInfo,
+  showTableInfo,
+  toggleTableInfo,
   focusSearch,
 });
 </script>
@@ -2581,9 +2706,9 @@ defineExpose({
                 </div>
               </div>
             </div>
-            <!-- DDL Drawer -->
+            <!-- Table Info Drawer -->
             <div
-              v-if="showDdl"
+              v-if="showTableInfo"
               class="relative shrink-0 border-l flex flex-col bg-background min-w-0"
               :class="{ 'ddl-drawer-resizing': isResizingDdl }"
               :style="ddlDrawerStyle"
@@ -2593,12 +2718,19 @@ defineExpose({
                 @mousedown.prevent="onDdlResizeStart"
               />
               <div class="flex items-center gap-2 px-3 py-1.5 border-b shrink-0 bg-muted/20">
-                <Code2 class="w-3.5 h-3.5 text-muted-foreground" />
-                <span class="text-xs font-medium flex-1 min-w-0 truncate">{{ tableMeta?.tableName }} DDL</span>
-                <Button variant="ghost" size="icon" class="h-5 w-5" @click="copyDdl">
+                <TableProperties class="w-3.5 h-3.5 text-muted-foreground" />
+                <span class="text-xs font-medium flex-1 min-w-0 truncate">{{ tableMeta?.tableName }}</span>
+                <Button
+                  v-if="activeTableInfoTab === 'ddl'"
+                  variant="ghost"
+                  size="icon"
+                  class="h-5 w-5"
+                  @click="copyDdl"
+                >
                   <Copy class="w-3 h-3" />
                 </Button>
                 <Button
+                  v-if="activeTableInfoTab === 'ddl'"
                   variant="ghost"
                   size="icon"
                   class="h-5 w-5"
@@ -2607,19 +2739,123 @@ defineExpose({
                 >
                   <WrapText class="w-3 h-3" />
                 </Button>
-                <Button variant="ghost" size="icon" class="h-5 w-5" @click="showDdl = false">
+                <Button variant="ghost" size="icon" class="h-5 w-5" @click="showTableInfo = false">
                   <X class="w-3 h-3" />
                 </Button>
               </div>
-              <div v-if="ddlLoading" class="flex-1 flex items-center justify-center">
-                <Loader2 class="w-4 h-4 animate-spin text-muted-foreground" />
+              <div class="grid grid-cols-5 border-b bg-background shrink-0">
+                <button
+                  v-for="tab in tableInfoTabs"
+                  :key="tab.id"
+                  class="h-9 min-w-0 px-1.5 text-[11px] text-muted-foreground border-b-2 border-transparent hover:bg-muted/50 hover:text-foreground"
+                  :class="{ 'border-primary text-foreground bg-muted/40': activeTableInfoTab === tab.id }"
+                  :title="tab.label"
+                  @click="selectTableInfoTab(tab.id)"
+                >
+                  <component :is="tab.icon" class="mx-auto h-3.5 w-3.5" />
+                  <span class="block truncate">{{ tab.label }}</span>
+                </button>
               </div>
+
+              <div v-if="activeTableInfoTab === 'columns'" class="flex-1 min-h-0 overflow-auto">
+                <table class="w-full text-xs">
+                  <thead class="sticky top-0 bg-muted/80 backdrop-blur text-muted-foreground">
+                    <tr class="border-b">
+                      <th class="text-left font-medium px-3 py-2">{{ t("grid.columnName") }}</th>
+                      <th class="text-left font-medium px-3 py-2">{{ t("grid.columnType") }}</th>
+                      <th class="text-left font-medium px-3 py-2">{{ t("grid.tableInfoNullable") }}</th>
+                    </tr>
+                  </thead>
+                  <tbody>
+                    <tr v-for="column in tableMeta?.columns" :key="column.name" class="border-b hover:bg-muted/30">
+                      <td class="px-3 py-2 font-medium">
+                        <span class="inline-flex items-center gap-1.5">
+                          <KeyRound v-if="column.is_primary_key" class="h-3 w-3 text-amber-500" />
+                          {{ column.name }}
+                        </span>
+                        <div v-if="column.comment" class="mt-0.5 text-[11px] text-muted-foreground truncate">
+                          {{ column.comment }}
+                        </div>
+                      </td>
+                      <td class="px-3 py-2 font-mono text-[11px] text-muted-foreground">{{ column.data_type }}</td>
+                      <td class="px-3 py-2">{{ column.is_nullable ? "YES" : "NO" }}</td>
+                    </tr>
+                  </tbody>
+                </table>
+              </div>
+
+              <div v-else-if="activeTableInfoTab === 'indexes'" class="flex-1 min-h-0 overflow-auto">
+                <div v-if="indexesLoading" class="h-full flex items-center justify-center">
+                  <Loader2 class="w-4 h-4 animate-spin text-muted-foreground" />
+                </div>
+                <div v-else-if="indexesError" class="p-3 text-xs text-destructive">{{ indexesError }}</div>
+                <div v-else-if="indexes.length === 0" class="p-6 text-center text-xs text-muted-foreground">
+                  {{ t("grid.tableInfoEmpty") }}
+                </div>
+                <div v-else class="divide-y">
+                  <div v-for="index in indexes" :key="index.name" class="p-3 text-xs">
+                    <div class="font-medium truncate">{{ index.name }}</div>
+                    <div class="mt-1 flex flex-wrap gap-1">
+                      <span v-if="index.is_primary" class="rounded bg-amber-500/10 px-1.5 py-0.5 text-amber-600"
+                        >PK</span
+                      >
+                      <span v-if="index.is_unique" class="rounded bg-emerald-500/10 px-1.5 py-0.5 text-emerald-600"
+                        >UNIQUE</span
+                      >
+                      <span v-if="index.index_type" class="rounded bg-muted px-1.5 py-0.5 text-muted-foreground">{{
+                        index.index_type
+                      }}</span>
+                    </div>
+                    <div class="mt-2 font-mono text-[11px] text-muted-foreground break-all">
+                      {{ index.columns.join(", ") }}
+                    </div>
+                  </div>
+                </div>
+              </div>
+
+              <div v-else-if="activeTableInfoTab === 'foreignKeys'" class="flex-1 min-h-0 overflow-auto">
+                <div v-if="foreignKeysLoading" class="h-full flex items-center justify-center">
+                  <Loader2 class="w-4 h-4 animate-spin text-muted-foreground" />
+                </div>
+                <div v-else-if="foreignKeysError" class="p-3 text-xs text-destructive">{{ foreignKeysError }}</div>
+                <div v-else-if="foreignKeys.length === 0" class="p-6 text-center text-xs text-muted-foreground">
+                  {{ t("grid.tableInfoEmpty") }}
+                </div>
+                <div v-else class="divide-y">
+                  <div v-for="fk in foreignKeys" :key="`${fk.name}:${fk.column}`" class="p-3 text-xs">
+                    <div class="font-medium truncate">{{ fk.name }}</div>
+                    <div class="mt-1 font-mono text-[11px] text-muted-foreground break-all">
+                      {{ fk.column }} -> {{ fk.ref_table }}.{{ fk.ref_column }}
+                    </div>
+                  </div>
+                </div>
+              </div>
+
+              <div v-else-if="activeTableInfoTab === 'triggers'" class="flex-1 min-h-0 overflow-auto">
+                <div v-if="triggersLoading" class="h-full flex items-center justify-center">
+                  <Loader2 class="w-4 h-4 animate-spin text-muted-foreground" />
+                </div>
+                <div v-else-if="triggersError" class="p-3 text-xs text-destructive">{{ triggersError }}</div>
+                <div v-else-if="triggers.length === 0" class="p-6 text-center text-xs text-muted-foreground">
+                  {{ t("grid.tableInfoEmpty") }}
+                </div>
+                <div v-else class="divide-y">
+                  <div v-for="trigger in triggers" :key="trigger.name" class="p-3 text-xs">
+                    <div class="font-medium truncate">{{ trigger.name }}</div>
+                    <div class="mt-1 text-[11px] text-muted-foreground">{{ trigger.timing }} {{ trigger.event }}</div>
+                  </div>
+                </div>
+              </div>
+
               <pre
-                v-else
+                v-else-if="activeTableInfoTab === 'ddl' && !ddlLoading"
                 class="flex-1 min-w-0 text-xs font-mono p-3 overflow-auto ddl-code leading-5 select-text"
                 :class="ddlWrap ? 'whitespace-pre-wrap break-words' : 'whitespace-pre'"
                 v-html="highlightSql(ddlContent)"
               ></pre>
+              <div v-else class="flex-1 flex items-center justify-center">
+                <Loader2 class="w-4 h-4 animate-spin text-muted-foreground" />
+              </div>
             </div>
             <!-- Cell Detail Drawer -->
             <div
diff --git a/src/components/layout/ContentArea.vue b/src/components/layout/ContentArea.vue
index 0803e3babb..79619b4021 100644
--- a/src/components/layout/ContentArea.vue
+++ b/src/components/layout/ContentArea.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { computed, ref, defineAsyncComponent } from "vue";
 import { useI18n } from "vue-i18n";
-import { Loader2, Square, Bot, Table2, GitBranch, BarChart3, Code2 } from "lucide-vue-next";
+import { Loader2, Square, Bot, Table2, GitBranch, BarChart3, TableProperties } from "lucide-vue-next";
 import { Splitpanes, Pane } from "splitpanes";
 import "splitpanes/dist/splitpanes.css";
 import { Button } from "@/components/ui/button";
@@ -382,7 +382,7 @@ defineExpose({ focusSearch });
             :class="{ 'bg-accent': dataGridRef?.showDdl }"
             @click="dataGridRef?.toggleDdl()"
           >
-            <Code2 class="h-3.5 w-3.5" /> DDL
+            <TableProperties class="h-3.5 w-3.5" /> {{ t("grid.tableInfo") }}
           </Button>
         </div>
         <DataGrid
diff --git a/src/composables/useDataGridEditor.ts b/src/composables/useDataGridEditor.ts
index caf6a8438b..c467fe21a1 100644
--- a/src/composables/useDataGridEditor.ts
+++ b/src/composables/useDataGridEditor.ts
@@ -12,6 +12,7 @@ import { supportsDataGridTransaction } from "@/lib/tableEditing";
 import { useConnectionStore } from "@/stores/connectionStore";
 import { useHistoryStore } from "@/stores/historyStore";
 import type { ColumnInfo, DatabaseType } from "@/types/database";
+import { DBX_NEO4J_ELEMENT_ID_COLUMN, DBX_ROWID_COLUMN } from "@/lib/tableEditing";
 
 type CellValue = string | number | boolean | null;
 
@@ -371,12 +372,31 @@ export function useDataGridEditor(options: UseDataGridEditorOptions) {
     });
   }
 
+  function clonedRowData(item: RowItem): CellValue[] {
+    const columnInfoByName = new Map(
+      (tableMeta.value?.columns ?? []).map((column) => [column.name.toLowerCase(), column]),
+    );
+    return item.data.map((val, i) => {
+      const columnName = result.value.columns[i];
+      const columnInfo = columnInfoByName.get(columnName.toLowerCase());
+      return shouldClearClonedColumn(columnName, columnInfo) ? null : val;
+    });
+  }
+
+  function shouldClearClonedColumn(columnName: string, columnInfo: ColumnInfo | undefined): boolean {
+    if (databaseType.value === "oracle" && columnName.toUpperCase() === DBX_ROWID_COLUMN) return true;
+    if (databaseType.value === "neo4j" && columnName === DBX_NEO4J_ELEMENT_ID_COLUMN) return true;
+    const extra = columnInfo?.extra ?? "";
+    const columnDefault = columnInfo?.column_default ?? "";
+    return (
+      /\b(auto_increment|autoincrement|identity|generated)\b/i.test(extra) || /\bnextval\s*\(/i.test(columnDefault)
+    );
+  }
+
   function cloneRow(rowId: number) {
     const item = getRowItem(rowId);
     if (!item) return;
-    const primaryKeys = tableMeta.value?.primaryKeys ?? [];
-    const columns = result.value.columns;
-    const clonedData = item.data.map((val, i) => (primaryKeys.includes(columns[i]) ? null : val));
+    const clonedData = clonedRowData(item);
     rowStatusFilter.value = rowStatusFilterAfterAddingRow(rowStatusFilter.value);
     newRows.value.push(clonedData);
     if (useTransaction.value && !transactionActive.value) {
@@ -391,13 +411,11 @@ export function useDataGridEditor(options: UseDataGridEditorOptions) {
   }
 
   function cloneRows(rowIds: number[]) {
-    const primaryKeys = tableMeta.value?.primaryKeys ?? [];
-    const columns = result.value.columns;
     rowStatusFilter.value = rowStatusFilterAfterAddingRow(rowStatusFilter.value);
     for (const rowId of rowIds) {
       const item = getRowItem(rowId);
       if (!item) continue;
-      const clonedData = item.data.map((val, i) => (primaryKeys.includes(columns[i]) ? null : val));
+      const clonedData = clonedRowData(item);
       newRows.value.push(clonedData);
     }
     if (useTransaction.value && !transactionActive.value) {
@@ -559,7 +577,9 @@ export function useDataGridEditor(options: UseDataGridEditorOptions) {
     const validationError = stmtOptions
       ? validateDataGridSave({
           databaseType: databaseType.value,
+          tableMeta: tableMeta.value,
           columns: stmtOptions.columns,
+          rows: stmtOptions.rows,
           columnInfo: tableMeta.value?.columns,
           dirtyRows: stmtOptions.dirtyRows,
           newRows: stmtOptions.newRows,
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index b7aa9fb23f..94531b8f51 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -294,10 +294,10 @@ export default {
     discard: "Discard",
     dismiss: "Dismiss",
     addRow: "Add Row",
-    cloneRow: "Clone Row",
+    cloneRow: "Clone as New Row",
     deleteRow: "Delete Row",
     deleteRows: "Delete {count} Rows",
-    cloneRows: "Clone {count} Rows",
+    cloneRows: "Clone {count} as New Rows",
     restoreRows: "Restore {count} Rows",
     copyRows: "Copy {count} Rows (JSON)",
     copyRowsInsert: "Copy {count} Rows as INSERT",
@@ -327,6 +327,13 @@ export default {
     transpose: "Transpose Row",
     rowsPerPageShort: " rows",
     columnDetails: "Column Details",
+    tableInfo: "Table Info",
+    tableInfoColumns: "Columns",
+    tableInfoIndexes: "Indexes",
+    tableInfoForeignKeys: "Foreign Keys",
+    tableInfoTriggers: "Triggers",
+    tableInfoNullable: "Nullable",
+    tableInfoEmpty: "No metadata",
     queryError: "Query Error",
     refresh: "Refresh",
     commit: "Commit",
@@ -498,6 +505,22 @@ export default {
     thinking: "Thinking...",
     reasoningProcess: "Thinking process",
     stopGenerating: "Stop generating",
+    tableMentionEmpty: "No matching tables",
+    tableMentionPlaceholderHint: "Type {'@'} to mention tables for context",
+    tableMentionTypes: {
+      table: "Table",
+      view: "View",
+      systemTable: "System table",
+      temporaryTable: "Temporary table",
+    },
+    modes: {
+      ask: "Ask",
+      agent: "Agent",
+    },
+    modeHints: {
+      ask: "Generate SQL and explanations without auto-running them",
+      agent: "Auto-run safe queries when possible",
+    },
     fixWithAi: "Fix with AI",
     truncated: "Context truncated",
     contextSummary: "{database} · {tables} tables",
diff --git a/src/i18n/locales/es.ts b/src/i18n/locales/es.ts
index fee8a09705..1befb41d13 100644
--- a/src/i18n/locales/es.ts
+++ b/src/i18n/locales/es.ts
@@ -295,10 +295,10 @@ export default {
     discard: "Descartar",
     dismiss: "Cerrar",
     addRow: "Agregar fila",
-    cloneRow: "Clonar fila",
+    cloneRow: "Clonar como fila nueva",
     deleteRow: "Eliminar fila",
     deleteRows: "Eliminar {count} filas",
-    cloneRows: "Clonar {count} filas",
+    cloneRows: "Clonar {count} como filas nuevas",
     restoreRows: "Restaurar {count} filas",
     copyRows: "Copiar {count} filas (JSON)",
     copyRowsInsert: "Copiar {count} filas como INSERT",
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index 44a220666e..e7788d613b 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -291,10 +291,10 @@ export default {
     discard: "放弃",
     dismiss: "关闭",
     addRow: "新增行",
-    cloneRow: "克隆行",
+    cloneRow: "克隆为新行",
     deleteRow: "删除行",
     deleteRows: "删除 {count} 行",
-    cloneRows: "克隆 {count} 行",
+    cloneRows: "克隆 {count} 行为新行",
     restoreRows: "恢复 {count} 行",
     copyRows: "复制 {count} 行 (JSON)",
     copyRowsInsert: "复制 {count} 行为 INSERT",
@@ -324,6 +324,13 @@ export default {
     transpose: "转置查看",
     rowsPerPageShort: " 行/页",
     columnDetails: "列详情",
+    tableInfo: "表属性",
+    tableInfoColumns: "字段",
+    tableInfoIndexes: "索引",
+    tableInfoForeignKeys: "外键",
+    tableInfoTriggers: "触发器",
+    tableInfoNullable: "可空",
+    tableInfoEmpty: "暂无元数据",
     queryError: "查询出错",
     refresh: "刷新",
     commit: "提交",
@@ -487,6 +494,22 @@ export default {
     thinking: "思考中...",
     reasoningProcess: "思考过程",
     stopGenerating: "停止生成",
+    tableMentionEmpty: "没有匹配的表",
+    tableMentionPlaceholderHint: "输入 {'@'} 可选择表并带入上下文",
+    tableMentionTypes: {
+      table: "表",
+      view: "视图",
+      systemTable: "系统表",
+      temporaryTable: "临时表",
+    },
+    modes: {
+      ask: "Ask",
+      agent: "Agent",
+    },
+    modeHints: {
+      ask: "只生成 SQL 和说明，不自动执行",
+      agent: "可自动执行安全查询",
+    },
     fixWithAi: "用 AI 修复",
     truncated: "上下文已截断",
     contextSummary: "{database} · {tables} 张表",
diff --git a/src/lib/ai.ts b/src/lib/ai.ts
index 34a6755a44..6ffc649d2a 100644
--- a/src/lib/ai.ts
+++ b/src/lib/ai.ts
@@ -11,6 +11,8 @@ import type {
 } from "@/types/database";
 import * as api from "@/lib/api";
 import { currentLocale } from "@/i18n";
+import { aiTableMentionKey, type AiTableMention } from "@/lib/aiTableMentions";
+import { isSchemaAware } from "@/lib/databaseCapabilities";
 
 export type AiAction = "generate" | "explain" | "optimize" | "fix" | "convert" | "sampleData";
 
@@ -169,6 +171,9 @@ export function buildSystemPrompt(action: AiAction, context: AiContext): string
       ? "当用户要求分析或查看某个表时，生成 SELECT 查询获取数据，而不是查询元数据。"
       : "When the user asks to 'analyze' or 'look at' a table, generate a SELECT query to retrieve data, not a metadata query.",
     isZh ? "不要编造 Schema 中不存在的表或列。" : "Never invent tables or columns that are not in the schema context.",
+    isZh
+      ? "用户输入中的 @schema.table 或 @table 表示用户明确提到的表；这些表已优先放入 Schema 上下文。"
+      : "User input may contain @schema.table or @table mentions. Treat them as explicit table references; mentioned tables are prioritized in the schema context.",
     isZh
       ? "对于 DROP、DELETE、TRUNCATE、ALTER 或没有 WHERE 的 UPDATE，简要警告并优先提供安全的 SELECT 预览。"
       : "For destructive statements (DROP, DELETE, TRUNCATE, ALTER, UPDATE without WHERE), warn briefly and prefer a safer SELECT preview.",
@@ -255,11 +260,12 @@ function formatSchema(context: AiContext): string {
 export async function buildAiContext(
   tab: QueryTab,
   connection: ConnectionConfig,
-  options: { maxTables?: number; maxColumnsPerTable?: number } = {},
+  options: { maxTables?: number; maxColumnsPerTable?: number; mentionedTables?: AiTableMention[] } = {},
 ): Promise<AiContext> {
   const maxTables = options.maxTables ?? 50;
   const maxColumnsPerTable = options.maxColumnsPerTable ?? 40;
   const tables: AiSchemaTable[] = [];
+  const tableKeys = new Set<string>();
   let truncated = false;
 
   if (tab.tableMeta) {
@@ -277,8 +283,20 @@ export async function buildAiContext(
       indexes,
       foreignKeys,
     });
+    tableKeys.add(aiTableMentionKey(tab.tableMeta.schema, tName));
     truncated = tab.tableMeta.columns.length > maxColumnsPerTable;
-  } else if (!["redis", "mongodb"].includes(connection.db_type)) {
+  }
+
+  for (const mention of options.mentionedTables ?? []) {
+    const key = aiTableMentionKey(mention.schema, mention.table);
+    if (tableKeys.has(key)) continue;
+    const entry = await loadMentionedTableContext(tab, connection, mention, maxColumnsPerTable).catch(() => undefined);
+    if (!entry) continue;
+    tableKeys.add(aiTableMentionKey(entry.schema, entry.name));
+    tables.push(entry);
+  }
+
+  if (!tab.tableMeta && !["redis", "mongodb"].includes(connection.db_type)) {
     try {
       const schemas = await loadCandidateSchemas(tab, connection);
       for (const schema of schemas) {
@@ -295,7 +313,7 @@ export async function buildAiContext(
                 .listForeignKeys(tab.connectionId, tab.database, schema, table.name)
                 .catch(() => [] as ForeignKeyInfo[]),
             ]).then(([columns, indexes, foreignKeys]) => ({
-              schema: schema === tab.database && connection.db_type !== "postgres" ? undefined : schema,
+              schema: schema === tab.database && !isSchemaAware(connection.db_type) ? undefined : schema,
               name: table.name,
               tableType: table.table_type,
               columns: columns.slice(0, maxColumnsPerTable),
@@ -309,6 +327,9 @@ export async function buildAiContext(
         for (const meta of metaResults) {
           if (meta._truncatedCols) truncated = true;
           const { _truncatedCols, ...entry } = meta;
+          const key = aiTableMentionKey(entry.schema, entry.name);
+          if (tableKeys.has(key)) continue;
+          tableKeys.add(key);
           tables.push(entry);
         }
         if (tables.length >= maxTables) break;
@@ -330,8 +351,49 @@ export async function buildAiContext(
   };
 }
 
+async function loadMentionedTableContext(
+  tab: QueryTab,
+  connection: ConnectionConfig,
+  mention: AiTableMention,
+  maxColumnsPerTable: number,
+): Promise<AiSchemaTable | undefined> {
+  const schema = await resolveMentionedTableSchema(tab, connection, mention);
+  const [columns, indexes, foreignKeys] = await Promise.all([
+    api.getColumns(tab.connectionId, tab.database, schema, mention.table),
+    api.listIndexes(tab.connectionId, tab.database, schema, mention.table).catch(() => [] as IndexInfo[]),
+    api.listForeignKeys(tab.connectionId, tab.database, schema, mention.table).catch(() => [] as ForeignKeyInfo[]),
+  ]);
+  return {
+    schema: schema === tab.database && !isSchemaAware(connection.db_type) ? undefined : schema,
+    name: mention.table,
+    tableType: "TABLE",
+    columns: columns.slice(0, maxColumnsPerTable),
+    indexes,
+    foreignKeys,
+  };
+}
+
+async function resolveMentionedTableSchema(
+  tab: QueryTab,
+  connection: ConnectionConfig,
+  mention: AiTableMention,
+): Promise<string> {
+  if (mention.schema) return mention.schema;
+  if (tab.tableMeta?.tableName.toLowerCase() === mention.table.toLowerCase() && tab.tableMeta.schema) {
+    return tab.tableMeta.schema;
+  }
+  if (isSchemaAware(connection.db_type)) {
+    const schemas = await loadCandidateSchemas(tab, connection);
+    for (const schema of schemas) {
+      const tables = await api.listTables(tab.connectionId, tab.database, schema, mention.table, 10).catch(() => []);
+      if (tables.some((table) => table.name.toLowerCase() === mention.table.toLowerCase())) return schema;
+    }
+  }
+  return tab.database || connection.database || "main";
+}
+
 async function loadCandidateSchemas(tab: QueryTab, connection: ConnectionConfig): Promise<string[]> {
-  if (connection.db_type === "postgres" || connection.db_type === "sqlserver") {
+  if (isSchemaAware(connection.db_type)) {
     const schemas = await api.listSchemas(tab.connectionId, tab.database);
     return prioritizeSchemas(schemas);
   }
diff --git a/src/lib/aiTableMentions.ts b/src/lib/aiTableMentions.ts
new file mode 100644
index 0000000000..072c6597ba
--- /dev/null
+++ b/src/lib/aiTableMentions.ts
@@ -0,0 +1,103 @@
+export interface AiTableMention {
+  raw: string;
+  schema?: string;
+  table: string;
+}
+
+const SIMPLE_IDENTIFIER_RE = /^[\p{L}_][\p{L}\p{N}_$]*$/u;
+
+function isMentionBoundary(char: string | undefined): boolean {
+  return !char || /\s|[([{,;:]/.test(char);
+}
+
+function isUnquotedMentionChar(char: string): boolean {
+  return /[\p{L}\p{N}_$.-]/u.test(char);
+}
+
+function readQuotedSegment(source: string, start: number): { value: string; end: number } | null {
+  const quote = source[start];
+  if (quote !== '"' && quote !== "`") return null;
+  let value = "";
+  for (let i = start + 1; i < source.length; i++) {
+    const char = source[i];
+    if (char === quote) {
+      if (source[i + 1] === quote) {
+        value += quote;
+        i++;
+        continue;
+      }
+      return { value, end: i + 1 };
+    }
+    value += char;
+  }
+  return null;
+}
+
+function readMentionToken(source: string, start: number): { raw: string; parts: string[]; end: number } | null {
+  let i = start;
+  const parts: string[] = [];
+  let raw = "";
+
+  while (i < source.length) {
+    const quoted = readQuotedSegment(source, i);
+    if (quoted) {
+      parts.push(quoted.value);
+      raw += source.slice(i, quoted.end);
+      i = quoted.end;
+    } else {
+      let value = "";
+      const valueStart = i;
+      while (i < source.length && isUnquotedMentionChar(source[i]) && source[i] !== ".") {
+        value += source[i];
+        i++;
+      }
+      if (!value) break;
+      parts.push(value);
+      raw += source.slice(valueStart, i);
+    }
+
+    if (source[i] !== ".") break;
+    raw += ".";
+    i++;
+  }
+
+  const usableParts = parts.filter(Boolean);
+  if (!usableParts.length) return null;
+  return { raw, parts: usableParts, end: i };
+}
+
+export function parseAiTableMentions(text: string): AiTableMention[] {
+  const mentions: AiTableMention[] = [];
+  const seen = new Set<string>();
+
+  for (let i = 0; i < text.length; i++) {
+    if (text[i] !== "@" || !isMentionBoundary(text[i - 1])) continue;
+    const token = readMentionToken(text, i + 1);
+    if (!token) continue;
+
+    const table = token.parts[token.parts.length - 1];
+    const schema = token.parts.length > 1 ? token.parts[token.parts.length - 2] : undefined;
+    const key = `${schema || ""}.${table}`.toLowerCase();
+    if (!seen.has(key)) {
+      seen.add(key);
+      mentions.push({ raw: `@${token.raw}`, schema, table });
+    }
+    i = token.end - 1;
+  }
+
+  return mentions;
+}
+
+export function formatAiTableMention(schema: string | undefined, table: string): string {
+  const parts = [schema, table].filter((part): part is string => !!part);
+  return `@${parts.map(formatMentionPart).join(".")}`;
+}
+
+function formatMentionPart(part: string): string {
+  if (SIMPLE_IDENTIFIER_RE.test(part)) return part;
+  return `"${part.replace(/"/g, '""')}"`;
+}
+
+export function aiTableMentionKey(schema: string | undefined, table: string): string {
+  return `${schema || ""}.${table}`.toLowerCase();
+}
diff --git a/src/lib/dataGridSql.ts b/src/lib/dataGridSql.ts
index 69a1a23d92..e24c776649 100644
--- a/src/lib/dataGridSql.ts
+++ b/src/lib/dataGridSql.ts
@@ -29,13 +29,18 @@ export interface DataGridSaveStatementOptions {
 
 export interface DataGridSaveValidationOptions {
   databaseType?: DatabaseType;
+  tableMeta?: DataGridTableMeta;
   columns: string[];
+  rows?: GridCellValue[][];
   columnInfo?: DataGridColumnInfo[];
   dirtyRows: Array<[number, Array<[number, GridCellValue]>]>;
   newRows: GridCellValue[][];
 }
 
 export function validateDataGridSave(options: DataGridSaveValidationOptions): string | undefined {
+  const duplicateKeyError = validateInsertedPrimaryKeys(options);
+  if (duplicateKeyError) return duplicateKeyError;
+
   const notNullColumns = new Set(
     (options.columnInfo ?? [])
       .filter(
@@ -69,6 +74,32 @@ export function validateDataGridSave(options: DataGridSaveValidationOptions): st
   return undefined;
 }
 
+function validateInsertedPrimaryKeys(options: DataGridSaveValidationOptions): string | undefined {
+  const primaryKeys = options.tableMeta?.primaryKeys ?? [];
+  if (primaryKeys.length === 0 || options.newRows.length === 0) return undefined;
+
+  const primaryKeyIndexes = primaryKeys.map((primaryKey) => findColumnIndex(options.columns, primaryKey));
+  if (primaryKeyIndexes.some((index) => index === -1)) return undefined;
+
+  const existingKeys = new Set<string>();
+  for (const row of options.rows ?? []) {
+    const key = primaryKeyValueKey(primaryKeyIndexes, row);
+    if (key) existingKeys.add(key);
+  }
+
+  const newKeys = new Set<string>();
+  for (const row of options.newRows) {
+    const key = primaryKeyValueKey(primaryKeyIndexes, row);
+    if (!key) continue;
+    if (existingKeys.has(key) || newKeys.has(key)) {
+      return duplicatePrimaryKeyError(primaryKeys, primaryKeyIndexes, row, existingKeys.has(key));
+    }
+    newKeys.add(key);
+  }
+
+  return undefined;
+}
+
 export function buildDataGridSaveStatements(options: DataGridSaveStatementOptions): string[] {
   if (options.databaseType === "neo4j") return buildNeo4jDataGridSaveStatements(options);
 
@@ -252,6 +283,36 @@ function isNullWriteToNotNullColumn(
   return value === null && notNullColumns.has(normalizeColumnName(column));
 }
 
+function findColumnIndex(columns: string[], target: string): number {
+  const normalizedTarget = normalizeColumnName(target);
+  return columns.findIndex((column) => normalizeColumnName(column) === normalizedTarget);
+}
+
+function primaryKeyValueKey(primaryKeyIndexes: number[], row: GridCellValue[]): string | undefined {
+  const values = primaryKeyIndexes.map((index) => row[index]);
+  if (values.some((value) => value === null || value === undefined)) return undefined;
+  return JSON.stringify(values);
+}
+
+function duplicatePrimaryKeyError(
+  primaryKeys: string[],
+  primaryKeyIndexes: number[],
+  row: GridCellValue[],
+  matchesExistingRow: boolean,
+): string {
+  const keySummary = primaryKeys
+    .map((primaryKey, index) => `${primaryKey} = ${formatKeyValueForMessage(row[primaryKeyIndexes[index]])}`)
+    .join(", ");
+  const source = matchesExistingRow ? "the existing primary key" : "another new row's primary key";
+  return `New row duplicates ${source} (${keySummary}). Change the key before saving.`;
+}
+
+function formatKeyValueForMessage(value: GridCellValue): string {
+  if (value === null || value === undefined) return "NULL";
+  if (typeof value === "string") return `"${value.replace(/"/g, '\\"')}"`;
+  return String(value);
+}
+
 function normalizeColumnName(name: string): string {
   return name.toUpperCase();
 }
diff --git a/tests/aiTableMentions.test.ts b/tests/aiTableMentions.test.ts
new file mode 100644
index 0000000000..f7985615d6
--- /dev/null
+++ b/tests/aiTableMentions.test.ts
@@ -0,0 +1,28 @@
+import { strict as assert } from "node:assert";
+import test from "node:test";
+import { formatAiTableMention, parseAiTableMentions } from "../src/lib/aiTableMentions.ts";
+
+test("parses simple and schema-qualified AI table mentions", () => {
+  assert.deepEqual(parseAiTableMentions("show @users and join @public.orders"), [
+    { raw: "@users", schema: undefined, table: "users" },
+    { raw: "@public.orders", schema: "public", table: "orders" },
+  ]);
+});
+
+test("parses quoted AI table mentions with spaces and dots", () => {
+  assert.deepEqual(parseAiTableMentions('compare @"sales schema"."order.items" with @"audit log"'), [
+    { raw: '@"sales schema"."order.items"', schema: "sales schema", table: "order.items" },
+    { raw: '@"audit log"', schema: undefined, table: "audit log" },
+  ]);
+});
+
+test("deduplicates AI table mentions case-insensitively", () => {
+  assert.deepEqual(parseAiTableMentions("check @public.Users then @PUBLIC.users"), [
+    { raw: "@public.Users", schema: "public", table: "Users" },
+  ]);
+});
+
+test("formats AI table mentions with quotes only when needed", () => {
+  assert.equal(formatAiTableMention("public", "users"), "@public.users");
+  assert.equal(formatAiTableMention("sales schema", "order items"), '@"sales schema"."order items"');
+});
diff --git a/tests/dataGridEditor.test.ts b/tests/dataGridEditor.test.ts
new file mode 100644
index 0000000000..3fa7dae319
--- /dev/null
+++ b/tests/dataGridEditor.test.ts
@@ -0,0 +1,162 @@
+import { strict as assert } from "node:assert";
+import test from "node:test";
+import { computed, nextTick, ref } from "vue";
+import { createPinia, setActivePinia } from "pinia";
+import { useDataGridEditor } from "../src/composables/useDataGridEditor.ts";
+import type { ColumnInfo } from "../src/types/database.ts";
+
+type CellValue = string | number | boolean | null;
+
+function installBrowserTestGlobals() {
+  globalThis.document = { querySelector: () => null } as unknown as Document;
+  globalThis.localStorage = {
+    getItem: () => null,
+    setItem: () => {},
+    removeItem: () => {},
+    clear: () => {},
+    key: () => null,
+    length: 0,
+  };
+}
+
+function column(name: string, isPrimaryKey = false, extra: string | null = null): ColumnInfo {
+  return {
+    name,
+    data_type: "VARCHAR",
+    is_nullable: true,
+    column_default: null,
+    is_primary_key: isPrimaryKey,
+    extra,
+  };
+}
+
+test("cloning a row copies non-generated primary key values without executing save", async () => {
+  setActivePinia(createPinia());
+  installBrowserTestGlobals();
+
+  const result = computed(() => ({
+    columns: ["code", "year", "score"],
+    rows: [["AFW", 1995, 35271.907090628745] as CellValue[]],
+  }));
+  const rowStatusFilter = ref<"all" | "changed" | "edited" | "new" | "deleted">("all");
+  let saveCalls = 0;
+  let editor: ReturnType<typeof useDataGridEditor>;
+
+  editor = useDataGridEditor({
+    result,
+    editable: computed(() => true),
+    databaseType: computed(() => "postgres"),
+    connectionId: computed(() => undefined),
+    database: computed(() => undefined),
+    tableMeta: computed(() => ({
+      tableName: "metrics",
+      columns: [column("code", true), column("year", true), column("score")],
+      primaryKeys: ["code", "year"],
+    })),
+    onExecuteSql: computed(() => undefined),
+    customSave: computed(() => async () => {
+      saveCalls += 1;
+    }),
+    sql: computed(() => undefined),
+    searchText: ref(""),
+    whereFilterInput: ref(""),
+    orderByInput: ref(""),
+    rowStatusFilter,
+    pageSize: ref(100),
+    currentPage: ref(1),
+    getRowItem: (rowId) => {
+      if (rowId === 0) {
+        return {
+          id: 0,
+          sourceIndex: 0,
+          data: result.value.rows[0],
+          isNew: false,
+          isDeleted: false,
+          isDirtyCol: [false, false, false],
+          status: "clean",
+        };
+      }
+      if (rowId < 0) {
+        const newIndex = -rowId - 1;
+        const row = editor.newRows.value[newIndex];
+        if (!row) return undefined;
+        return {
+          id: rowId,
+          newIndex,
+          data: row,
+          isNew: true,
+          isDeleted: false,
+          isDirtyCol: [false, false, false],
+          status: "new",
+        };
+      }
+      return undefined;
+    },
+    emit: () => {},
+  });
+
+  editor.cloneRow(0);
+  await nextTick();
+
+  assert.equal(saveCalls, 0);
+  assert.deepEqual(editor.newRows.value, [["AFW", 1995, 35271.907090628745]]);
+  assert.equal(editor.transactionActive.value, true);
+  assert.deepEqual(editor.editingCell.value, { rowId: -1, col: 0 });
+
+  await editor.saveChanges();
+
+  assert.equal(saveCalls, 1);
+  assert.deepEqual(editor.newRows.value, []);
+});
+
+test("cloning a row clears auto-generated key columns", async () => {
+  setActivePinia(createPinia());
+  installBrowserTestGlobals();
+
+  const result = computed(() => ({
+    columns: ["id", "name"],
+    rows: [[1, "Ada"] as CellValue[]],
+  }));
+  const rowStatusFilter = ref<"all" | "changed" | "edited" | "new" | "deleted">("all");
+  let editor: ReturnType<typeof useDataGridEditor>;
+
+  editor = useDataGridEditor({
+    result,
+    editable: computed(() => true),
+    databaseType: computed(() => "mysql"),
+    connectionId: computed(() => undefined),
+    database: computed(() => undefined),
+    tableMeta: computed(() => ({
+      tableName: "people",
+      columns: [column("id", true, "auto_increment"), column("name")],
+      primaryKeys: ["id"],
+    })),
+    onExecuteSql: computed(() => undefined),
+    customSave: computed(() => undefined),
+    sql: computed(() => undefined),
+    searchText: ref(""),
+    whereFilterInput: ref(""),
+    orderByInput: ref(""),
+    rowStatusFilter,
+    pageSize: ref(100),
+    currentPage: ref(1),
+    getRowItem: (rowId) => {
+      if (rowId !== 0) return undefined;
+      return {
+        id: 0,
+        sourceIndex: 0,
+        data: result.value.rows[0],
+        isNew: false,
+        isDeleted: false,
+        isDirtyCol: [false, false],
+        status: "clean",
+      };
+    },
+    emit: () => {},
+  });
+
+  editor.cloneRow(0);
+  await nextTick();
+
+  assert.deepEqual(editor.newRows.value, [[null, "Ada"]]);
+});
diff --git a/tests/dataGridSql.test.ts b/tests/dataGridSql.test.ts
index f3078febc0..ae96a5e6f3 100644
--- a/tests/dataGridSql.test.ts
+++ b/tests/dataGridSql.test.ts
@@ -232,7 +232,12 @@ test("rejects NULL writes to non-null table columns", () => {
 test("allows NULL for MySQL auto increment columns when inserting rows", () => {
   const error = validateDataGridSave({
     databaseType: "mysql",
+    tableMeta: {
+      tableName: "people",
+      primaryKeys: ["id"],
+    },
     columns: ["id", "name"],
+    rows: [],
     columnInfo: [
       { name: "id", is_nullable: false, column_default: null, is_primary_key: true, extra: "auto_increment" },
       { name: "name", is_nullable: false, column_default: null, is_primary_key: false, extra: null },
@@ -243,3 +248,54 @@ test("allows NULL for MySQL auto increment columns when inserting rows", () => {
 
   assert.equal(error, undefined);
 });
+
+test("rejects inserted rows that duplicate existing primary key values", () => {
+  const error = validateDataGridSave({
+    databaseType: "postgres",
+    tableMeta: {
+      tableName: "education_data",
+      primaryKeys: ["country_code", "year"],
+    },
+    columns: ["country_code", "year", "value"],
+    rows: [["ALB", 2021, 0.812]],
+    columnInfo: [
+      { name: "country_code", is_nullable: false, column_default: null, is_primary_key: true, extra: null },
+      { name: "year", is_nullable: false, column_default: null, is_primary_key: true, extra: null },
+      { name: "value", is_nullable: true, column_default: null, is_primary_key: false, extra: null },
+    ],
+    dirtyRows: [],
+    newRows: [["ALB", 2021, 0.812]],
+  });
+
+  assert.equal(
+    error,
+    'New row duplicates the existing primary key (country_code = "ALB", year = 2021). Change the key before saving.',
+  );
+});
+
+test("rejects inserted rows that duplicate another new row primary key", () => {
+  const error = validateDataGridSave({
+    databaseType: "postgres",
+    tableMeta: {
+      tableName: "education_data",
+      primaryKeys: ["country_code", "year"],
+    },
+    columns: ["country_code", "year", "value"],
+    rows: [],
+    columnInfo: [
+      { name: "country_code", is_nullable: false, column_default: null, is_primary_key: true, extra: null },
+      { name: "year", is_nullable: false, column_default: null, is_primary_key: true, extra: null },
+      { name: "value", is_nullable: true, column_default: null, is_primary_key: false, extra: null },
+    ],
+    dirtyRows: [],
+    newRows: [
+      ["ALB", 2021, 0.812],
+      ["ALB", 2021, 0.913],
+    ],
+  });
+
+  assert.equal(
+    error,
+    'New row duplicates another new row\'s primary key (country_code = "ALB", year = 2021). Change the key before saving.',
+  );
+});