diff --git a/apps/desktop/src/components/editor/DangerConfirmDialog.vue b/apps/desktop/src/components/editor/DangerConfirmDialog.vue
index 4b18a893e..76cb8e464 100644
--- a/apps/desktop/src/components/editor/DangerConfirmDialog.vue
+++ b/apps/desktop/src/components/editor/DangerConfirmDialog.vue
@@ -1,12 +1,17 @@
 <script setup lang="ts">
 import { computed, ref } from "vue";
 import { useI18n } from "vue-i18n";
-import { AlertTriangle, Loader2, TextWrap } from "@lucide/vue";
+import { AlertTriangle, Check, Copy, Loader2, TextWrap } from "@lucide/vue";
 import { Button } from "@/components/ui/button";
 import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from "@/components/ui/dialog";
 import { Label } from "@/components/ui/label";
 import { Switch } from "@/components/ui/switch";
 import { useSqlHighlighter } from "@/composables/useSqlHighlighter";
+import { copyToClipboard } from "@/lib/common/clipboard";
+import { createBoundedTextPreview } from "@/lib/common/boundedTextPreview";
+
+const DANGER_PREVIEW_MAX_CHARACTERS = 8192;
+const DANGER_PREVIEW_MAX_LINES = 200;
 
 const { t } = useI18n();
 const { highlight } = useSqlHighlighter();
@@ -14,6 +19,7 @@ const { highlight } = useSqlHighlighter();
 const open = defineModel<boolean>("open", { default: false });
 const suppressFuturePrompts = defineModel<boolean>("suppressFuturePrompts", { default: false });
 const wrap = ref(false);
+const copied = ref(false);
 
 const props = withDefaults(
   defineProps<{
@@ -47,7 +53,10 @@ const emit = defineEmits<{
 }>();
 
 const code = computed(() => props.details || props.sql);
-const highlightedCode = computed(() => highlight(code.value));
+// Keep the confirmation payload intact, but never feed an unbounded script to Shiki or the DOM.
+const preview = computed(() => createBoundedTextPreview(code.value, { maxCharacters: DANGER_PREVIEW_MAX_CHARACTERS, maxLines: DANGER_PREVIEW_MAX_LINES }));
+const highlightedHead = computed(() => highlight(preview.value.head));
+const highlightedTail = computed(() => highlight(preview.value.tail));
 const dialogOpen = computed({
   get: () => open.value,
   set: (value) => {
@@ -61,6 +70,14 @@ function onConfirm() {
   if (props.closeOnConfirm) open.value = false;
   emit("confirm");
 }
+
+async function copyFullCode() {
+  await copyToClipboard(code.value);
+  copied.value = true;
+  window.setTimeout(() => {
+    copied.value = false;
+  }, 1500);
+}
 </script>
 
 <template>
@@ -78,10 +95,22 @@ function onConfirm() {
         <p v-if="detailsText" class="text-xs text-muted-foreground mb-3 whitespace-pre-line">{{ detailsText }}</p>
         <slot name="options" />
         <div v-if="code" class="relative">
-          <Button variant="ghost" size="icon-xs" class="absolute top-1 right-1 z-10 h-6 w-6" :class="wrap ? 'text-foreground bg-accent' : 'text-muted-foreground'" :title="t('dangerDialog.wrapLines')" @click="wrap = !wrap">
-            <TextWrap class="h-3.5 w-3.5" />
-          </Button>
-          <pre class="text-xs bg-muted px-3 pt-3 pb-3 pr-7 rounded overflow-auto max-h-40 min-w-0 font-mono" :class="wrap ? 'whitespace-pre-wrap' : 'whitespace-pre'" v-html="highlightedCode" />
+          <div class="absolute top-1 right-1 z-10 flex items-center gap-0.5">
+            <Button variant="ghost" size="icon-xs" class="h-6 w-6 text-muted-foreground" :title="t('dangerDialog.copyFullText')" @click="copyFullCode">
+              <Check v-if="copied" class="h-3.5 w-3.5 text-emerald-600" />
+              <Copy v-else class="h-3.5 w-3.5" />
+            </Button>
+            <Button variant="ghost" size="icon-xs" class="h-6 w-6" :class="wrap ? 'text-foreground bg-accent' : 'text-muted-foreground'" :title="t('dangerDialog.wrapLines')" @click="wrap = !wrap">
+              <TextWrap class="h-3.5 w-3.5" />
+            </Button>
+          </div>
+          <div data-native-clipboard data-testid="danger-code-preview" class="text-xs bg-muted px-3 pt-3 pb-3 pr-14 rounded overflow-auto max-h-40 min-w-0 font-mono" :class="wrap ? 'whitespace-pre-wrap' : 'whitespace-pre'">
+            <pre class="font-inherit whitespace-inherit" v-html="highlightedHead" />
+            <div v-if="preview.truncated" data-testid="danger-preview-truncated" class="my-2 rounded border border-border/70 bg-background/70 px-2 py-1.5 text-center text-[11px] leading-4 text-muted-foreground whitespace-normal">
+              {{ t("dangerDialog.previewTruncated", { lines: preview.omittedLines.toLocaleString(), characters: preview.omittedCharacters.toLocaleString() }) }}
+            </div>
+            <pre v-if="preview.tail" class="font-inherit whitespace-inherit" v-html="highlightedTail" />
+          </div>
         </div>
         <div v-if="showSuppressToggle" class="mt-3 flex items-center justify-between gap-4 rounded-md border bg-muted/20 px-3 py-2">
           <Label for="danger-confirm-suppress" class="text-sm leading-5">{{ suppressToggleLabel || t("dangerDialog.suppressFuturePrompts") }}</Label>
diff --git a/apps/desktop/src/components/editor/__tests__/DangerConfirmDialog.spec.ts b/apps/desktop/src/components/editor/__tests__/DangerConfirmDialog.spec.ts
new file mode 100644
index 000000000..8ada13746
--- /dev/null
+++ b/apps/desktop/src/components/editor/__tests__/DangerConfirmDialog.spec.ts
@@ -0,0 +1,86 @@
+// @vitest-environment happy-dom
+
+import { createApp, defineComponent, h, nextTick, reactive, type App } from "vue";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import i18n from "@/i18n";
+import DangerConfirmDialog from "@/components/editor/DangerConfirmDialog.vue";
+import { copyToClipboard } from "@/lib/common/clipboard";
+
+const DANGER_PREVIEW_MAX_CHARACTERS = 8192;
+const DANGER_PREVIEW_MAX_LINES = 200;
+const highlight = vi.fn((sql: string) => `<span>${sql}</span>`);
+
+vi.mock("@/composables/useSqlHighlighter", () => ({
+  useSqlHighlighter: () => ({ highlight }),
+}));
+
+vi.mock("@/lib/common/clipboard", () => ({
+  copyToClipboard: vi.fn(),
+}));
+
+const mountedApps: App[] = [];
+
+async function mountDialog(sql: string) {
+  const state = reactive({ open: true });
+  const container = document.createElement("div");
+  document.body.append(container);
+  const app = createApp(
+    defineComponent({
+      setup: () => () =>
+        h(DangerConfirmDialog, {
+          open: state.open,
+          sql,
+          "onUpdate:open": (value: boolean) => {
+            state.open = value;
+          },
+        }),
+    }),
+  );
+  mountedApps.push(app);
+  app.use(i18n);
+  app.mount(container);
+  await nextTick();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+}
+
+afterEach(() => {
+  for (const app of mountedApps.splice(0)) app.unmount();
+  document.body.innerHTML = "";
+  highlight.mockClear();
+  vi.mocked(copyToClipboard).mockClear();
+});
+
+describe("DangerConfirmDialog SQL preview", () => {
+  it("fully highlights short SQL without a truncation notice", async () => {
+    const sql = "DROP TABLE IF EXISTS users;";
+
+    await mountDialog(sql);
+
+    expect(highlight).toHaveBeenCalledOnce();
+    expect(highlight).toHaveBeenCalledWith(sql);
+    expect(document.body.querySelector('[data-testid="danger-preview-truncated"]')).toBeNull();
+  });
+
+  it("highlights only bounded head and tail fragments for huge SQL", async () => {
+    const sql = Array.from({ length: 40_000 }, (_, index) => `INSERT INTO t VALUES (${index});`).join("\n");
+
+    await mountDialog(sql);
+
+    const highlightedCharacters = highlight.mock.calls.reduce((total, [fragment]) => total + fragment.length, 0);
+    expect(highlight).toHaveBeenCalledTimes(2);
+    expect(highlightedCharacters).toBeLessThanOrEqual(DANGER_PREVIEW_MAX_CHARACTERS);
+    expect(highlight.mock.calls.flatMap(([fragment]) => fragment.split("\n"))).toHaveLength(DANGER_PREVIEW_MAX_LINES);
+    expect(document.body.querySelector('[data-testid="danger-preview-truncated"]')?.textContent).toContain("Preview truncated");
+  });
+
+  it("copies the full SQL instead of the bounded preview", async () => {
+    const sql = Array.from({ length: 40_000 }, (_, index) => `INSERT INTO t VALUES (${index});`).join("\n");
+
+    await mountDialog(sql);
+    const copyButton = Array.from(document.body.querySelectorAll("button")).find((button) => button.title === "Copy full text");
+    copyButton?.click();
+    await nextTick();
+
+    expect(copyToClipboard).toHaveBeenCalledWith(sql);
+  });
+});
diff --git a/apps/desktop/src/composables/__tests__/useSqlExecution.spec.ts b/apps/desktop/src/composables/__tests__/useSqlExecution.spec.ts
index 28a39b698..69deea434 100644
--- a/apps/desktop/src/composables/__tests__/useSqlExecution.spec.ts
+++ b/apps/desktop/src/composables/__tests__/useSqlExecution.spec.ts
@@ -294,6 +294,35 @@ describe("useSqlExecution", () => {
     expect(addHistory).toHaveBeenCalledWith(expect.objectContaining({ success: false, error: "relation does not exist" }));
   });
 
+  it("keeps the full dangerous script pending and executes it unchanged after confirmation", async () => {
+    const activeTab = ref<QueryTab | undefined>(queryTab("app"));
+    const activeConnection = ref<ConnectionConfig | undefined>(connection("mysql"));
+    const activeOutputView = ref<"result" | "summary" | "explain" | "chart">("result");
+    const queryStore = useQueryStore();
+    const sql = Array.from({ length: 40_000 }, (_, index) => `${index === 0 ? "DROP TABLE IF EXISTS t;" : ""} INSERT INTO t VALUES (${index});`).join("\n");
+    const executeCurrentSql = vi.spyOn(queryStore, "executeCurrentSql").mockImplementation(async () => {
+      if (activeTab.value) activeTab.value.result = { columns: [], rows: [], affected_rows: 40_000, execution_time_ms: 1 };
+    });
+    vi.spyOn(useHistoryStore(), "add").mockResolvedValue(undefined);
+
+    const execution = useSqlExecution({
+      activeTab: computed(() => activeTab.value),
+      activeConnection: computed(() => activeConnection.value),
+      executableSql: computed(() => sql),
+      activeOutputView,
+    });
+
+    await execution.tryExecute();
+
+    expect(execution.showDangerDialog.value).toBe(true);
+    expect(execution.pendingDangerSql.value).toBe(sql);
+    expect(executeCurrentSql).not.toHaveBeenCalled();
+
+    await execution.onDangerConfirm();
+
+    expect(executeCurrentSql).toHaveBeenCalledWith(sql, {});
+  });
+
   it("requires production confirmation even when ordinary danger prompts are disabled", async () => {
     const activeTab = ref<QueryTab | undefined>(queryTab("prod_app"));
     const activeConnection = ref<ConnectionConfig | undefined>({ ...connection("mysql"), production_databases: ["prod_app"] });
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 4782e319d..b01012323 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -2860,6 +2860,8 @@ export default {
     redisCommandMessage: "This Redis command may modify data and cannot be undone automatically. Continue?",
     suppressFuturePrompts: "Do not ask again for dangerous SQL",
     wrapLines: "Toggle word wrap",
+    copyFullText: "Copy full text",
+    previewTruncated: "Preview truncated: {characters} characters across {lines} lines omitted. Copy still includes the full text.",
     deleteMessage: "This delete operation may be irreversible. Continue?",
     deleteConfirm: "Confirm Delete",
     deleteRowMessage: "This row will be marked for deletion and removed from the database after saving. Continue?",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index cfb2976d7..d9dbc50b4 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -2714,6 +2714,8 @@ export default withEnglishFallback({
     redisCommandMessage: "Este comando de Redis puede modificar datos y no se puede deshacer automáticamente. ¿Continuar?",
     suppressFuturePrompts: "No volver a preguntar para SQL peligroso",
     wrapLines: "Alternar ajuste de línea",
+    copyFullText: "Copiar texto completo",
+    previewTruncated: "Vista previa truncada: se omitieron {lines} líneas y {characters} caracteres. La copia incluye el texto completo.",
     deleteMessage: "Esta operación de eliminación puede ser irreversible. ¿Continuar?",
     deleteConfirm: "Confirmar eliminación",
     deleteRowMessage: "Esta fila quedará marcada para eliminación y se borrará de la base de datos al guardar. ¿Continuar?",
diff --git a/apps/desktop/src/i18n/locales/it.ts b/apps/desktop/src/i18n/locales/it.ts
index f06c919d2..b67d0d238 100644
--- a/apps/desktop/src/i18n/locales/it.ts
+++ b/apps/desktop/src/i18n/locales/it.ts
@@ -2712,6 +2712,8 @@ export default withEnglishFallback({
     redisCommandMessage: "Questo comando Redis può modificare i dati e non può essere annullato automaticamente. Continuare?",
     suppressFuturePrompts: "Non chiedere più per SQL pericolosi",
     wrapLines: "Attiva/disattiva ritorno a capo",
+    copyFullText: "Copia testo completo",
+    previewTruncated: "Anteprima troncata: omesse {lines} righe e {characters} caratteri. La copia include il testo completo.",
     deleteMessage: "Questa operazione di eliminazione potrebbe essere irreversibile. Continuare?",
     deleteConfirm: "Conferma Eliminazione",
     deleteRowMessage: "Questa riga verrà contrassegnata per l'eliminazione e rimossa dal database dopo il salvataggio. Continuare?",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index 8a53f4716..172e90220 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -2713,6 +2713,8 @@ export default withEnglishFallback({
     redisCommandMessage: "このRedisコマンドはデータを変更し、自動的に元に戻せない可能性があります。続行しますか？",
     suppressFuturePrompts: "危険なSQLの確認を今後表示しない",
     wrapLines: "折り返し表示を切り替え",
+    copyFullText: "全文をコピー",
+    previewTruncated: "プレビューを省略しました: {lines} 行、{characters} 文字を省略。コピーには全文が含まれます。",
     deleteMessage: "この削除操作は元に戻せない可能性があります。続行しますか？",
     deleteConfirm: "削除を確認",
     deleteRowMessage: "この行は削除対象としてマークされ、保存後にデータベースから削除されます。続行しますか？",
diff --git a/apps/desktop/src/i18n/locales/pt-BR.ts b/apps/desktop/src/i18n/locales/pt-BR.ts
index 81da73116..bbf307323 100644
--- a/apps/desktop/src/i18n/locales/pt-BR.ts
+++ b/apps/desktop/src/i18n/locales/pt-BR.ts
@@ -2714,6 +2714,8 @@ export default withEnglishFallback({
     redisCommandMessage: "Este comando Redis pode modificar dados e não pode ser desfeito automaticamente. Continuar?",
     suppressFuturePrompts: "Não perguntar novamente para SQL perigoso",
     wrapLines: "Alternar quebra de linha",
+    copyFullText: "Copiar texto completo",
+    previewTruncated: "Visualização truncada: {lines} linhas e {characters} caracteres omitidos. A cópia inclui o texto completo.",
     deleteMessage: "Esta operação de exclusão pode ser irreversível. Continuar?",
     deleteConfirm: "Confirmar exclusão",
     deleteRowMessage: "Esta linha será marcada para exclusão e removida do banco de dados após salvar. Continuar?",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index 3f3734f4a..ca0115075 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -2850,6 +2850,8 @@ export default withEnglishFallback({
     redisCommandMessage: "此 Redis 命令可能会修改数据，且无法自动撤销，确认要继续吗？",
     suppressFuturePrompts: "以后执行危险 SQL 不再提示",
     wrapLines: "切换自动换行",
+    copyFullText: "复制完整内容",
+    previewTruncated: "预览已截断：省略 {lines} 行、{characters} 个字符。复制仍会包含完整内容。",
     deleteMessage: "此删除操作可能不可逆，确认要继续吗？",
     deleteConfirm: "确认删除",
     deleteRowMessage: "此行将被标记为删除，保存后会从数据库删除，确认要继续吗？",
diff --git a/apps/desktop/src/i18n/locales/zh-TW.ts b/apps/desktop/src/i18n/locales/zh-TW.ts
index f8875b7be..93b079e1f 100644
--- a/apps/desktop/src/i18n/locales/zh-TW.ts
+++ b/apps/desktop/src/i18n/locales/zh-TW.ts
@@ -2531,6 +2531,8 @@ export default withEnglishFallback({
     redisCommandMessage: "此 Redis 命令可能會修改資料，且無法自動復原，確認要繼續嗎？",
     suppressFuturePrompts: "之後執行危險 SQL 不再提示",
     wrapLines: "切換自動換行",
+    copyFullText: "複製完整內容",
+    previewTruncated: "預覽已截斷：省略 {lines} 行、{characters} 個字元。複製仍會包含完整內容。",
     deleteMessage: "此刪除操作可能不可逆，確認要繼續嗎？",
     deleteConfirm: "確認刪除",
     deleteRowMessage: "此列將被標記為刪除，儲存後會從資料庫刪除，確認要繼續嗎？",
diff --git a/apps/desktop/src/lib/common/__tests__/boundedTextPreview.spec.ts b/apps/desktop/src/lib/common/__tests__/boundedTextPreview.spec.ts
new file mode 100644
index 000000000..913b76e32
--- /dev/null
+++ b/apps/desktop/src/lib/common/__tests__/boundedTextPreview.spec.ts
@@ -0,0 +1,31 @@
+import { describe, expect, it } from "vitest";
+import { createBoundedTextPreview } from "@/lib/common/boundedTextPreview";
+
+describe("createBoundedTextPreview", () => {
+  it("keeps short text unchanged", () => {
+    const sql = "DROP TABLE IF EXISTS users;\nSELECT 1;";
+
+    expect(createBoundedTextPreview(sql, { maxCharacters: 8192, maxLines: 200 })).toEqual({
+      head: sql,
+      tail: "",
+      truncated: false,
+      omittedCharacters: 0,
+      omittedLines: 0,
+      totalCharacters: sql.length,
+      totalLines: 2,
+    });
+  });
+
+  it("bounds a 40k-line preview by both characters and lines", () => {
+    const sql = Array.from({ length: 40_000 }, (_, index) => `INSERT INTO t VALUES (${index});`).join("\n");
+    const preview = createBoundedTextPreview(sql, { maxCharacters: 8192, maxLines: 200 });
+
+    expect(preview.truncated).toBe(true);
+    expect(preview.head.length + preview.tail.length).toBeLessThanOrEqual(8192);
+    expect(preview.head.split("\n").length + preview.tail.split("\n").length).toBeLessThanOrEqual(200);
+    expect(preview.head).toContain("VALUES (0)");
+    expect(preview.tail).toContain("VALUES (39999)");
+    expect(preview.omittedCharacters).toBeGreaterThan(1_000_000);
+    expect(preview.omittedLines).toBeGreaterThanOrEqual(39_800);
+  });
+});
diff --git a/apps/desktop/src/lib/common/boundedTextPreview.ts b/apps/desktop/src/lib/common/boundedTextPreview.ts
new file mode 100644
index 000000000..56eef7f89
--- /dev/null
+++ b/apps/desktop/src/lib/common/boundedTextPreview.ts
@@ -0,0 +1,92 @@
+export interface BoundedTextPreviewOptions {
+  maxCharacters: number;
+  maxLines: number;
+}
+
+export interface BoundedTextPreview {
+  head: string;
+  tail: string;
+  truncated: boolean;
+  omittedCharacters: number;
+  omittedLines: number;
+  totalCharacters: number;
+  totalLines: number;
+}
+
+function countLines(text: string): number {
+  let lines = 1;
+  for (let index = 0; index < text.length; index += 1) {
+    if (text.charCodeAt(index) === 10) lines += 1;
+  }
+  return lines;
+}
+
+function clampCodePointEnd(text: string, end: number): number {
+  if (end <= 0 || end >= text.length) return end;
+  const previous = text.charCodeAt(end - 1);
+  const current = text.charCodeAt(end);
+  return previous >= 0xd800 && previous <= 0xdbff && current >= 0xdc00 && current <= 0xdfff ? end - 1 : end;
+}
+
+function clampCodePointStart(text: string, start: number): number {
+  if (start <= 0 || start >= text.length) return start;
+  const previous = text.charCodeAt(start - 1);
+  const current = text.charCodeAt(start);
+  return previous >= 0xd800 && previous <= 0xdbff && current >= 0xdc00 && current <= 0xdfff ? start + 1 : start;
+}
+
+function headBoundary(text: string, maxCharacters: number, maxLines: number): number {
+  const characterBoundary = Math.min(text.length, maxCharacters);
+  let lines = 1;
+  for (let index = 0; index < characterBoundary; index += 1) {
+    if (text.charCodeAt(index) !== 10) continue;
+    lines += 1;
+    if (lines > maxLines) return index;
+  }
+  return clampCodePointEnd(text, characterBoundary);
+}
+
+function tailBoundary(text: string, maxCharacters: number, maxLines: number): number {
+  const characterBoundary = Math.max(0, text.length - maxCharacters);
+  let lines = 1;
+  for (let index = text.length - 1; index >= characterBoundary; index -= 1) {
+    if (text.charCodeAt(index) !== 10) continue;
+    lines += 1;
+    if (lines > maxLines) return index + 1;
+  }
+  return clampCodePointStart(text, characterBoundary);
+}
+
+export function createBoundedTextPreview(text: string, options: BoundedTextPreviewOptions): BoundedTextPreview {
+  const maxCharacters = Math.max(2, Math.floor(options.maxCharacters));
+  const maxLines = Math.max(2, Math.floor(options.maxLines));
+  const totalLines = countLines(text);
+
+  if (text.length <= maxCharacters && totalLines <= maxLines) {
+    return {
+      head: text,
+      tail: "",
+      truncated: false,
+      omittedCharacters: 0,
+      omittedLines: 0,
+      totalCharacters: text.length,
+      totalLines,
+    };
+  }
+
+  const headEnd = headBoundary(text, Math.ceil(maxCharacters / 2), Math.ceil(maxLines / 2));
+  const tailStart = Math.max(headEnd, tailBoundary(text, Math.floor(maxCharacters / 2), Math.floor(maxLines / 2)));
+  const head = text.slice(0, headEnd);
+  const tail = text.slice(tailStart);
+  const visibleLines = countLines(head) + (tail ? countLines(tail) : 0);
+
+  return {
+    head,
+    tail,
+    truncated: true,
+    omittedCharacters: tailStart - headEnd,
+    omittedLines: Math.max(0, totalLines - visibleLines),
+    totalCharacters: text.length,
+    totalLines,
+  };
+}