diff --git a/.github/scripts/suggest-similar-issues.mjs b/.github/scripts/suggest-similar-issues.mjs
new file mode 100644
index 0000000000..50b94f90af
--- /dev/null
+++ b/.github/scripts/suggest-similar-issues.mjs
@@ -0,0 +1,575 @@
+#!/usr/bin/env node
+import fs from "node:fs";
+import { pathToFileURL } from "node:url";
+
+const API_VERSION = "2022-11-28";
+const COMMENT_MARKER = "<!-- dbx-similar-issues -->";
+const MAX_QUERY_LENGTH = 480;
+const MAX_CANDIDATES = 3;
+const SEARCH_RESULT_LIMIT = 20;
+
+const ignoredSectionPatterns = [
+  /数据库类型/i,
+  /database type/i,
+  /支持信息/i,
+  /support info/i,
+  /优先级/i,
+  /priority/i,
+  /补充信息/i,
+  /additional context/i,
+  /环境信息/i,
+  /environment/i,
+];
+
+const genericLatinTokens = new Set([
+  "ai",
+  "alter",
+  "bug",
+  "datagrip",
+  "dbeaver",
+  "dbx",
+  "delete",
+  "desktop",
+  "feature",
+  "from",
+  "insert",
+  "issue",
+  "navicat",
+  "question",
+  "request",
+  "select",
+  "sql",
+  "support",
+  "table",
+  "update",
+  "version",
+  "web",
+  "where",
+  "windows",
+]);
+
+const genericCjkTokens = new Set([
+  "一个",
+  "以及",
+  "使用",
+  "功能",
+  "可以",
+  "当前",
+  "支持",
+  "数据库",
+  "新增",
+  "增加",
+  "希望",
+  "异常",
+  "操作",
+  "所在",
+  "数据",
+  "显示",
+  "没有",
+  "现在",
+  "设置",
+  "问题",
+  "进行",
+  "错误",
+  "需要",
+]);
+const identifierQueryNoiseTokens = new Set([
+  "失效",
+  "弹出",
+  "快捷",
+  "提醒",
+  "时候",
+  "选择",
+]);
+
+const cjkSegmenter = new Intl.Segmenter("zh-CN", { granularity: "word" });
+const driverManifest = JSON.parse(
+  fs.readFileSync(new URL("../../crates/dbx-core/assets/database-drivers.manifest.json", import.meta.url), "utf8"),
+);
+const extraDatabaseAliases = {
+  mysql: ["mariadb", "percona", "tidb"],
+  postgres: ["postgresql", "pgsql", "hologres"],
+  sqlserver: ["sql server", "mssql"],
+  mongodb: ["mongo"],
+  dameng: ["dm8", "达梦"],
+  kingbase: ["kingbasees", "人大金仓", "金仓"],
+  highgo: ["瀚高"],
+  yashandb: ["崖山"],
+  opengauss: ["open gauss"],
+  "oceanbase-oracle": ["oceanbase oracle"],
+  gbase: ["gbase8a", "gbase8s"],
+};
+const databaseDrivers = driverManifest.drivers.map((driver) => ({
+  dbType: driver.dbType,
+  aliases: [driver.dbType, driver.label, ...(extraDatabaseAliases[driver.dbType] || [])],
+}));
+
+function loadIssue() {
+  if (process.env.GITHUB_EVENT_PATH && fs.existsSync(process.env.GITHUB_EVENT_PATH)) {
+    return JSON.parse(fs.readFileSync(process.env.GITHUB_EVENT_PATH, "utf8")).issue || {};
+  }
+
+  return {
+    number: process.env.ISSUE_NUMBER,
+    title: process.env.ISSUE_TITLE || "",
+    body: process.env.ISSUE_BODY || "",
+    labels: process.env.ISSUE_LABELS ? JSON.parse(process.env.ISSUE_LABELS) : [],
+  };
+}
+
+function labelNames(labels) {
+  return (labels || []).map((label) => (typeof label === "string" ? label : label.name)).filter(Boolean);
+}
+
+function stripIssuePrefix(title) {
+  return String(title || "").replace(/^\s*\[[^\]]+\]\s*/u, "").trim();
+}
+
+function stripMarkdown(value) {
+  return String(value || "")
+    .replace(/<!--.*?-->/gsu, " ")
+    .replace(/<img\b[^>]*>/giu, " ")
+    .replace(/!\[[^\]]*\]\([^)]*\)/gu, " ")
+    .replace(/\[([^\]]+)\]\([^)]*\)/gu, "$1")
+    .replace(/https?:\/\/\S+/giu, " ")
+    .replace(/```[^\n]*\n?/gu, " ")
+    .replace(/^\s*[_*-]{3,}\s*$/gmu, " ");
+}
+
+function parseIssueSections(body) {
+  const text = String(body || "");
+  const headings = [...text.matchAll(/^###\s+(.+?)\s*$/gmu)];
+  if (headings.length === 0) return [{ heading: "", content: text }];
+
+  return headings.map((heading, index) => {
+    const start = heading.index + heading[0].length;
+    const end = headings[index + 1]?.index ?? text.length;
+    return { heading: heading[1].trim(), content: text.slice(start, end).trim() };
+  });
+}
+
+function databaseField(body) {
+  return parseIssueSections(body).find(({ heading }) => /数据库类型|database type/iu.test(heading))?.content || "";
+}
+
+function relevantBody(body) {
+  const sections = parseIssueSections(body).filter(
+    ({ heading }) => !ignoredSectionPatterns.some((pattern) => pattern.test(heading)),
+  );
+  return stripMarkdown(sections.map(({ content }) => content).join("\n")).slice(0, 2400);
+}
+
+function normalizeText(value) {
+  return stripMarkdown(value)
+    .normalize("NFKC")
+    .toLocaleLowerCase("en-US")
+    .replace(/[^\p{Letter}\p{Number}+._-]+/gu, " ")
+    .replace(/\s+/gu, " ")
+    .trim();
+}
+
+export function searchTerms(issue) {
+  const title = normalizeText(stripIssuePrefix(issue.title));
+  const body = normalizeText(relevantBody(issue.body));
+  const terms = `${title} ${body}`
+    .split(/\s+/u)
+    .filter((term) => term.length >= 2)
+    .slice(0, 80)
+    .join(" ");
+  return terms.slice(0, MAX_QUERY_LENGTH).trim();
+}
+
+function semanticTokens(value) {
+  const normalized = normalizeText(value).replace(/[+._-]+/gu, " ");
+  const result = new Set(latinTokens(normalized));
+  let singleHanRun = "";
+  const flushSingleHanRun = () => {
+    for (let index = 0; index + 1 < singleHanRun.length; index += 2) {
+      const token = singleHanRun.slice(index, index + 2);
+      if (!genericCjkTokens.has(token)) result.add(token);
+    }
+    singleHanRun = "";
+  };
+
+  for (const part of cjkSegmenter.segment(normalized)) {
+    const token = part.segment.trim();
+    if (part.isWordLike && /^\p{Script=Han}$/u.test(token)) {
+      singleHanRun += token;
+      continue;
+    }
+    flushSingleHanRun();
+    if (!part.isWordLike || token.length < 2 || genericCjkTokens.has(token)) continue;
+    result.add(token);
+  }
+  flushSingleHanRun();
+  return result;
+}
+
+export function searchTitleTerms(issue) {
+  const identifiers = technicalIdentifiers(issue);
+  const tokens = [...semanticTokens(stripIssuePrefix(issue.title))].filter(
+    (token) => identifiers.size === 0 || !identifierQueryNoiseTokens.has(token),
+  );
+  return tokens.slice(0, 8).join(" ").slice(0, MAX_QUERY_LENGTH);
+}
+
+function latinTokens(value) {
+  return new Set(
+    normalizeText(value)
+      .match(/[a-z0-9][a-z0-9+._-]{1,}/gu)
+      ?.filter((token) => (
+        !genericLatinTokens.has(token)
+        && !/^v?\d+(?:[._-]\d+)*$/u.test(token)
+        && !/^(.)\1{2,}$/u.test(token)
+      )) || [],
+  );
+}
+
+function characterNgrams(value, size = 3) {
+  const compact = normalizeText(value).replace(/\s+/gu, "");
+  const result = new Set();
+  for (let index = 0; index <= compact.length - size; index += 1) {
+    result.add(compact.slice(index, index + size));
+  }
+  return result;
+}
+
+function intersectionSize(left, right) {
+  let count = 0;
+  for (const value of left) {
+    if (right.has(value)) count += 1;
+  }
+  return count;
+}
+
+function diceCoefficient(left, right) {
+  if (left.size === 0 || right.size === 0) return 0;
+  return (2 * intersectionSize(left, right)) / (left.size + right.size);
+}
+
+function typeLabels(labels) {
+  const types = new Set(["bug", "enhancement", "question"]);
+  return new Set(labelNames(labels).filter((label) => types.has(label)));
+}
+
+function databaseLabels(labels) {
+  return new Set(labelNames(labels).filter((label) => label.startsWith("db/")));
+}
+
+function databaseTypes(issue) {
+  const result = new Set([...databaseLabels(issue.labels)].map((label) => label.slice(3)));
+  const compactField = normalizeText(databaseField(issue.body)).replace(/[^\p{Letter}\p{Number}]+/gu, "");
+  if (!compactField) return result;
+
+  for (const driver of databaseDrivers) {
+    const matched = driver.aliases.some((alias) => {
+      const compactAlias = normalizeText(alias).replace(/[^\p{Letter}\p{Number}]+/gu, "");
+      return compactAlias.length >= 3 && compactField.includes(compactAlias);
+    });
+    if (matched) result.add(driver.dbType);
+  }
+  return result;
+}
+
+function databaseContentTokens(issue) {
+  const result = new Set();
+  const types = databaseTypes(issue);
+  for (const driver of databaseDrivers) {
+    if (!types.has(driver.dbType)) continue;
+    for (const alias of driver.aliases) {
+      for (const token of semanticTokens(alias)) result.add(token);
+    }
+  }
+  return result;
+}
+
+function contentTitleTokens(issue) {
+  const tokens = semanticTokens(stripIssuePrefix(issue.title));
+  const databaseTokens = databaseContentTokens(issue);
+  return new Set([...tokens].filter((token) => !databaseTokens.has(token)));
+}
+
+function contentTitleText(issue) {
+  return [...contentTitleTokens(issue)].join(" ");
+}
+
+function setsOverlap(left, right) {
+  return intersectionSize(left, right) > 0;
+}
+
+function highSignalBody(body) {
+  const sections = parseIssueSections(body);
+  const selected = sections.filter(({ heading }) => /错误|异常|日志|error|exception|log/iu.test(heading));
+  return stripMarkdown(selected.map(({ content }) => content).join("\n")).slice(0, 1200);
+}
+
+function technicalIdentifiers(issue) {
+  const identifiers = latinTokens(`${stripIssuePrefix(issue.title)}\n${highSignalBody(issue.body)}`);
+  const databaseTokens = databaseContentTokens(issue);
+  return new Set([...identifiers].filter((token) => !databaseTokens.has(token)));
+}
+
+function inverseDocumentFrequency(documentCount, documentFrequency) {
+  return Math.log(1 + (documentCount - documentFrequency + 0.5) / (documentFrequency + 0.5));
+}
+
+function tokenOccurrenceCount(value, token) {
+  const normalized = normalizeText(value).replace(/[+._-]+/gu, " ");
+  let count = 0;
+  let offset = 0;
+  while ((offset = normalized.indexOf(token, offset)) !== -1) {
+    count += 1;
+    offset += token.length;
+  }
+  return count;
+}
+
+function weightedCoverage(queryTokens, candidateTokens, weights) {
+  let matchedWeight = 0;
+  let totalWeight = 0;
+  for (const token of queryTokens) {
+    const weight = weights.get(token) || 0;
+    if (weight === 0) continue;
+    totalWeight += weight;
+    if (candidateTokens.has(token)) matchedWeight += weight;
+  }
+  return totalWeight === 0 ? 0 : matchedWeight / totalWeight;
+}
+
+export function buildCorpusContext(issue, candidates) {
+  const issueTitle = stripIssuePrefix(issue.title);
+  const queryTitleTokens = contentTitleTokens(issue);
+  const candidateTitleTokens = candidates.map((candidate) => contentTitleTokens(candidate));
+  const weights = new Map();
+  const frequencies = new Map();
+
+  for (const token of queryTitleTokens) {
+    const documentFrequency = candidateTitleTokens.reduce(
+      (count, tokens) => count + (tokens.has(token) ? 1 : 0),
+      0,
+    );
+    frequencies.set(token, documentFrequency);
+    const queryFrequencyBoost = 1 + Math.log(Math.max(1, tokenOccurrenceCount(issueTitle, token)));
+    weights.set(token, inverseDocumentFrequency(candidates.length, documentFrequency) * queryFrequencyBoost);
+  }
+
+  const observedWeights = [...queryTitleTokens]
+    .filter((token) => (frequencies.get(token) || 0) > 0)
+    .map((token) => weights.get(token) || 0);
+  const maximumWeight = Math.max(0, ...observedWeights);
+  const anchorTokens = new Set(
+    [...queryTitleTokens].filter((token) => (
+      maximumWeight > 0
+      && (frequencies.get(token) || 0) > 0
+      && (weights.get(token) || 0) >= maximumWeight * 0.9
+    )),
+  );
+
+  return { queryTitleTokens, candidateTitleTokens, weights, anchorTokens };
+}
+
+export function scoreCandidate(issue, candidate, rank = 0, corpusContext) {
+  const issueDatabases = databaseTypes(issue);
+  const candidateDatabases = databaseTypes(candidate);
+  if (issueDatabases.size > 0 && candidateDatabases.size > 0 && !setsOverlap(issueDatabases, candidateDatabases)) {
+    return { accepted: false, score: 0, reason: "database-mismatch" };
+  }
+
+  const issueTitle = stripIssuePrefix(issue.title);
+  const candidateTitle = stripIssuePrefix(candidate.title);
+  const issueBody = relevantBody(issue.body).slice(0, 1200);
+  const candidateBody = relevantBody(candidate.body).slice(0, 1200);
+  const titleSimilarity = diceCoefficient(
+    characterNgrams(contentTitleText(issue)),
+    characterNgrams(contentTitleText(candidate)),
+  );
+  const bodySimilarity = diceCoefficient(characterNgrams(issueBody), characterNgrams(candidateBody));
+  const context = corpusContext || buildCorpusContext(issue, [candidate]);
+  const candidateTitleTokens = corpusContext
+    ? context.candidateTitleTokens[rank]
+    : context.candidateTitleTokens[0];
+  const titleCoverage = weightedCoverage(context.queryTitleTokens, candidateTitleTokens, context.weights);
+  const anchorHit = setsOverlap(candidateTitleTokens, context.anchorTokens);
+  const issueIdentifiers = technicalIdentifiers(issue);
+  const candidateIdentifiers = technicalIdentifiers(candidate);
+  const identifierCoverage = issueIdentifiers.size === 0
+    ? 0
+    : intersectionSize(issueIdentifiers, candidateIdentifiers) / issueIdentifiers.size;
+  const rankPrior = 1 / Math.log2(rank + 2);
+
+  let score = titleCoverage * 0.45
+    + titleSimilarity * 0.25
+    + bodySimilarity * 0.1
+    + identifierCoverage * 0.15
+    + rankPrior * 0.05;
+  const issueTypes = typeLabels(issue.labels);
+  const candidateTypes = typeLabels(candidate.labels);
+  if (issueTypes.size > 0 && candidateTypes.size > 0) {
+    score += setsOverlap(issueTypes, candidateTypes) ? 0.02 : -0.06;
+  }
+  if (issueDatabases.size > 0 && candidateDatabases.size > 0) score += 0.04;
+
+  // Like Discourse, retrieval is deliberately broad and public suggestions
+  // require a separate threshold. Rare title terms act as BM25F-style anchors.
+  const accepted = score >= 0.34
+    || (anchorHit && titleCoverage >= 0.38 && score >= 0.2)
+    || (identifierCoverage >= 0.5 && titleCoverage >= 0.2 && score >= 0.28)
+    || (titleSimilarity + bodySimilarity >= 0.42 && score >= 0.28);
+
+  return {
+    accepted,
+    score,
+    signals: {
+      titleSimilarity,
+      titleCoverage,
+      bodySimilarity,
+      identifierCoverage,
+      anchorHit,
+      rankPrior,
+    },
+  };
+}
+
+export function rankCandidates(issue, items) {
+  const candidates = items.filter(
+    (candidate) => !candidate.pull_request && Number(candidate.number) !== Number(issue.number),
+  );
+  const context = buildCorpusContext(issue, candidates);
+  return candidates
+    .map((candidate, rank) => ({ candidate, ...scoreCandidate(issue, candidate, rank, context) }))
+    .filter((result) => result.accepted)
+    .sort((left, right) => right.score - left.score)
+    .slice(0, MAX_CANDIDATES);
+}
+
+function hasChinese(value) {
+  return /\p{Script=Han}/u.test(String(value || ""));
+}
+
+function safeTitle(value) {
+  return String(value || "")
+    .replace(/[\r\n]+/gu, " ")
+    .replace(/([\\`*_{}\[\]()<>#+.!|~-])/gu, "\\$1")
+    .trim();
+}
+
+export function formatComment(issue, rankedCandidates) {
+  const chinese = hasChinese(`${issue.title}\n${issue.body}`);
+  const lines = rankedCandidates.map(({ candidate }) => {
+    const state = String(candidate.state || "").toLowerCase() === "closed"
+      ? chinese ? "已关闭" : "Closed"
+      : chinese ? "进行中" : "Open";
+    const stateSuffix = chinese ? `（${state}）` : `(${state})`;
+    return `- #${candidate.number} — ${safeTitle(candidate.title)} ${stateSuffix}`;
+  });
+
+  if (chinese) {
+    return `${COMMENT_MARKER}\n以下 Issue 可能与当前问题相关：\n\n${lines.join("\n")}\n\n这些结果由机器人自动检索，尚未确认重复。如属于同一问题，建议在已有 Issue 中补充信息。`;
+  }
+
+  return `${COMMENT_MARKER}\nThe following issues may be related:\n\n${lines.join("\n")}\n\nThese results were found automatically and are not confirmed duplicates. If this is the same problem, consider adding details to the existing issue.`;
+}
+
+export class GitHubClient {
+  constructor({ token, repository, apiBase = "https://api.github.com" }) {
+    if (!token) throw new Error("GITHUB_TOKEN is required");
+    if (!repository) throw new Error("GITHUB_REPOSITORY is required");
+    this.token = token;
+    this.repository = repository;
+    this.apiBase = apiBase.replace(/\/$/u, "");
+  }
+
+  async request(method, path, body) {
+    const response = await fetch(`${this.apiBase}${path}`, {
+      method,
+      headers: {
+        Accept: "application/vnd.github+json",
+        Authorization: `Bearer ${this.token}`,
+        "Content-Type": "application/json",
+        "X-GitHub-Api-Version": API_VERSION,
+      },
+      body: body === undefined ? undefined : JSON.stringify(body),
+    });
+    const text = await response.text();
+    const payload = text ? JSON.parse(text) : null;
+    if (!response.ok) {
+      const error = new Error(`${method} ${path} failed: ${response.status} ${payload?.message || response.statusText}`);
+      error.status = response.status;
+      throw error;
+    }
+    return payload;
+  }
+
+  async searchIssues(query) {
+    const parameters = new URLSearchParams({
+      q: `repo:${this.repository} is:issue ${query}`,
+      search_type: "hybrid",
+      per_page: String(SEARCH_RESULT_LIMIT),
+    });
+    return this.request("GET", `/search/issues?${parameters}`);
+  }
+
+  async hasExistingComment(issueNumber) {
+    const comments = await this.request("GET", `/repos/${this.repository}/issues/${issueNumber}/comments?per_page=100`);
+    return comments.some((comment) => String(comment.body || "").includes(COMMENT_MARKER));
+  }
+
+  async comment(issueNumber, body) {
+    return this.request("POST", `/repos/${this.repository}/issues/${issueNumber}/comments`, { body });
+  }
+}
+
+export async function run({ issue = loadIssue(), client } = {}) {
+  if (issue.pull_request) {
+    console.log("Skipping pull request event");
+    return [];
+  }
+  if (!issue.number) throw new Error("Issue number is required");
+
+  const query = searchTitleTerms(issue) || searchTerms(issue);
+  if (query.length < 2) {
+    console.log("Skipping similar issue search because the issue has too little searchable text");
+    return [];
+  }
+
+  const github = client || new GitHubClient({
+    token: process.env.GITHUB_TOKEN,
+    repository: process.env.GITHUB_REPOSITORY,
+    apiBase: process.env.GITHUB_API_URL,
+  });
+  if (await github.hasExistingComment(issue.number)) {
+    console.log("Similar issue comment already exists");
+    return [];
+  }
+
+  let result;
+  try {
+    result = await github.searchIssues(query);
+  } catch (error) {
+    // Similar-issue suggestions are best-effort and must not turn a temporary
+    // semantic-search rate limit into a failed issue workflow.
+    if (error.status === 403 && /rate limit/iu.test(error.message)) {
+      console.warn(`Skipping similar issue search: ${error.message}`);
+      return [];
+    }
+    throw error;
+  }
+  const candidates = rankCandidates(issue, result.items || []);
+  if (candidates.length === 0) {
+    console.log(`No sufficiently similar issues found (${result.search_type || "unknown"} search)`);
+    return [];
+  }
+
+  if (process.env.DRY_RUN === "1" || process.env.DRY_RUN === "true") {
+    console.log(formatComment(issue, candidates));
+    return candidates;
+  }
+
+  await github.comment(issue.number, formatComment(issue, candidates));
+  console.log(`Commented ${candidates.length} similar issue suggestion(s) on #${issue.number}`);
+  return candidates;
+}
+
+if (process.argv[1] && pathToFileURL(process.argv[1]).href === import.meta.url) {
+  await run();
+}
diff --git a/.github/scripts/suggest-similar-issues.test.mjs b/.github/scripts/suggest-similar-issues.test.mjs
new file mode 100644
index 0000000000..961b81ef8f
--- /dev/null
+++ b/.github/scripts/suggest-similar-issues.test.mjs
@@ -0,0 +1,327 @@
+import assert from "node:assert/strict";
+import { createServer } from "node:http";
+import test from "node:test";
+
+import {
+  GitHubClient,
+  formatComment,
+  rankCandidates,
+  run,
+  scoreCandidate,
+  searchTitleTerms,
+} from "./suggest-similar-issues.mjs";
+
+const baseIssue = {
+  number: 4043,
+  title: "[Bug] 设置快捷键(Ctrl+Enter)执行光标所在语句失效了",
+  body: `### 数据库类型和版本
+
+MySQL 8.0
+
+### 问题描述
+
+设置快捷键 Ctrl+Enter 执行光标所在语句，现在会弹出选择框。
+
+### 支持信息
+
+DBX 版本: v0.5.62`,
+  labels: [{ name: "bug" }, { name: "db/mysql" }],
+};
+
+test("accepts a candidate with matching shortcut and execution behavior", () => {
+  const candidate = {
+    number: 82,
+    title: "[Feature] 设置里 ctrl+enter 执行功能添加模式选择",
+    body: "希望 Ctrl+Enter 可以直接执行光标所在 SQL 语句，不要弹出选择框。",
+    labels: [{ name: "enhancement" }, { name: "db/mysql" }],
+  };
+
+  const result = scoreCandidate(baseIssue, candidate);
+  assert.equal(result.accepted, true);
+  assert.equal(result.signals.identifierCoverage, 1);
+});
+
+test("builds a short title query with identifiers split safely", () => {
+  const query = searchTitleTerms(baseIssue);
+  assert.match(query, /\bctrl\b/u);
+  assert.match(query, /\benter\b/u);
+  assert.doesNotMatch(query, /ctrl\+enter/u);
+  assert.match(query, /执行/u);
+  assert.match(query, /光标/u);
+  assert.match(query, /语句/u);
+  assert.doesNotMatch(query, /失效|弹出/u);
+});
+
+test("keeps compound Chinese product terms in the title query", () => {
+  const query = searchTitleTerms({ title: "[Feature] 增加多列选中转置功能、增加转置列注释" });
+  assert.match(query, /多列/u);
+  assert.match(query, /转置/u);
+  assert.match(query, /注释/u);
+});
+
+test("rejects a candidate with conflicting database labels", () => {
+  const candidate = {
+    number: 100,
+    title: "Ctrl+Enter 执行语句异常",
+    body: "快捷键无法执行当前语句。",
+    labels: [{ name: "bug" }, { name: "db/postgres" }],
+  };
+
+  assert.deepEqual(scoreCandidate(baseIssue, candidate), {
+    accepted: false,
+    score: 0,
+    reason: "database-mismatch",
+  });
+});
+
+test("detects database conflicts from issue forms before labels are added", () => {
+  const issue = {
+    number: 300,
+    title: "[Bug] 查询保存失败",
+    body: "### 数据库类型和版本\n\nPostgreSQL 16\n\n### 问题描述\n\n修改后保存失败。",
+    labels: [{ name: "bug" }],
+  };
+  const mysqlCandidate = {
+    number: 301,
+    title: "[Bug] 查询保存失败",
+    body: "### 数据库类型和版本\n\nMySQL 8.0\n\n### 问题描述\n\n修改后保存失败。",
+    labels: [{ name: "bug" }],
+  };
+  const postgresCandidate = {
+    number: 302,
+    title: "[Bug] 查询保存失败",
+    body: "### Database type and version\n\nPostgres 15\n\n### Description\n\nSaving changes fails.",
+    labels: [{ name: "bug" }],
+  };
+
+  assert.equal(scoreCandidate(issue, mysqlCandidate).reason, "database-mismatch");
+  assert.equal(scoreCandidate(issue, postgresCandidate).accepted, true);
+});
+
+test("does not treat a shared database product as issue similarity", () => {
+  const issue = {
+    number: 4048,
+    title: "[Bug] OceanBase数据库Oracle模式下显示错误且无法修改数据",
+    body: "### 数据库类型和版本\n\nOceanBase Oracle\n\n### 问题描述\n\n查询后无法修改表数据。",
+    labels: [{ name: "bug" }],
+  };
+  const candidates = [
+    {
+      number: 2549,
+      title: "[Feature] OceanBase数据库的Oracle模式显示更多内容",
+      body: "### 数据库类型和版本\n\nOceanBase Oracle",
+      labels: [{ name: "enhancement" }, { name: "db/oceanbase-oracle" }],
+    },
+    {
+      number: 2489,
+      title: "OceanBase Oracle模式下NUMBER类型查询精度丢失",
+      body: "### 数据库类型和版本\n\nOceanBase Oracle",
+      labels: [{ name: "bug" }, { name: "db/oceanbase-oracle" }],
+    },
+  ];
+
+  assert.deepEqual(rankCandidates(issue, candidates), []);
+});
+
+test("rejects broad semantic matches without concrete shared terms", () => {
+  const candidate = {
+    number: 200,
+    title: "[Bug] SQL 编辑器光标显示不出来",
+    body: "打开编辑器后看不到光标，但查询仍可执行。",
+    labels: [{ name: "bug" }, { name: "db/mysql" }],
+  };
+
+  assert.equal(scoreCandidate(baseIssue, candidate).accepted, false);
+});
+
+test("prefers matching title concepts over a shared product reference", () => {
+  const issue = {
+    number: 4057,
+    title: "[Feature] 增加多列选中转置功能、增加转置列注释",
+    body: "希望参考 DBeaver，同时预览多行转置数据并显示列注释。",
+    labels: [{ name: "enhancement" }],
+  };
+  const related = {
+    number: 2201,
+    title: "转置视图：同时显示字段注释和类型",
+    body: "转置结果中显示字段注释。",
+    labels: [{ name: "enhancement" }],
+  };
+  const unrelated = {
+    number: 4055,
+    title: "[Feature] 增加字段拖动到编辑器、输入框中",
+    body: "参考 DBeaver，将字段拖进 SQL 编辑器。",
+    labels: [{ name: "enhancement" }],
+  };
+
+  assert.ok(scoreCandidate(issue, related).score > scoreCandidate(issue, unrelated).score);
+});
+
+test("uses corpus rarity to reject generic real-world matches", () => {
+  const issue = {
+    number: 4057,
+    title: "[Feature] 增加多列选中转置功能、增加转置列注释",
+    body: "希望多行同时转置进行对比，并显示列注释。",
+    labels: [{ name: "enhancement" }],
+  };
+  const candidates = [
+    { number: 3556, title: "优化左侧连接信息表中文注释的显示和拖动行为", labels: [{ name: "enhancement" }] },
+    { number: 3496, title: "查询结果支持多选行批量修改字段值", labels: [{ name: "enhancement" }] },
+    { number: 2160, title: "光标批量选中卡顿且建议增加批量注释功能", labels: [{ name: "enhancement" }] },
+    { number: 1652, title: "建议增加一键多行注释和一键取消多行注释功能", labels: [{ name: "enhancement" }] },
+    {
+      number: 2201,
+      title: "转置视图：同时显示字段注释和类型",
+      body: "转置结果中显示字段注释。",
+      labels: [{ name: "enhancement" }],
+    },
+    { number: 2129, title: "支持悬停显示字段注释并修复结果字段注释", labels: [{ name: "enhancement" }] },
+  ];
+
+  const ranked = rankCandidates(issue, candidates);
+  assert.deepEqual(ranked.map(({ candidate }) => candidate.number), [2201]);
+  assert.equal(ranked[0].signals.anchorHit, true);
+});
+
+test("ranks candidates, excludes the current issue and limits output", () => {
+  const candidates = [
+    { ...baseIssue },
+    {
+      number: 82,
+      title: "Ctrl+Enter 执行当前 SQL 语句",
+      body: "Ctrl+Enter 直接执行光标所在语句，不显示选择框。",
+      state: "open",
+      labels: [{ name: "bug" }, { name: "db/mysql" }],
+    },
+    {
+      number: 83,
+      title: "Ctrl+Enter 快捷键执行 SQL",
+      body: "执行光标当前语句时快捷键弹出选择框。",
+      state: "closed",
+      labels: [{ name: "bug" }, { name: "db/mysql" }],
+    },
+    {
+      number: 84,
+      title: "SQL 编辑器光标颜色",
+      body: "光标在暗色主题下不明显。",
+      labels: [{ name: "bug" }],
+    },
+  ];
+
+  const ranked = rankCandidates(baseIssue, candidates);
+  assert.deepEqual(new Set(ranked.map(({ candidate }) => candidate.number)), new Set([82, 83]));
+});
+
+test("formats a cautious localized comment and escapes titles", () => {
+  const comment = formatComment(baseIssue, [
+    { candidate: { number: 82, title: "[Bug] [快捷键](https://example.com)", state: "closed" } },
+  ]);
+
+  assert.match(comment, /^<!-- dbx-similar-issues -->/u);
+  assert.match(comment, /#82/u);
+  assert.match(comment, /尚未确认重复/u);
+  assert.match(comment, /已关闭/u);
+  assert.doesNotMatch(comment, /\]\(https:/u);
+});
+
+test("run searches and posts one idempotent comment", async (t) => {
+  const requests = [];
+  const server = createServer((request, response) => {
+    const chunks = [];
+    request.on("data", (chunk) => chunks.push(chunk));
+    request.on("end", () => {
+      const body = chunks.length > 0 ? JSON.parse(Buffer.concat(chunks).toString("utf8")) : null;
+      requests.push({ method: request.method, url: request.url, body });
+      response.setHeader("Content-Type", "application/json");
+
+      if (request.method === "GET" && request.url.includes("/comments")) {
+        response.end("[]");
+        return;
+      }
+      if (request.method === "GET" && request.url.startsWith("/search/issues?")) {
+        response.end(JSON.stringify({
+          search_type: "hybrid",
+          items: [{
+            number: 82,
+            title: "Ctrl+Enter 执行当前 SQL 语句",
+            body: "Ctrl+Enter 直接执行光标所在语句，不显示选择框。",
+            state: "open",
+            labels: [{ name: "bug" }, { name: "db/mysql" }],
+          }],
+        }));
+        return;
+      }
+      if (request.method === "POST" && request.url.endsWith("/comments")) {
+        response.statusCode = 201;
+        response.end(JSON.stringify({ id: 1 }));
+        return;
+      }
+      response.statusCode = 404;
+      response.end(JSON.stringify({ message: "not found" }));
+    });
+  });
+
+  await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
+  t.after(() => new Promise((resolve, reject) => server.close((error) => (error ? reject(error) : resolve()))));
+  const address = server.address();
+  assert.ok(address && typeof address !== "string");
+
+  const client = new GitHubClient({
+    token: "test-token",
+    repository: "t8y2/dbx",
+    apiBase: `http://127.0.0.1:${address.port}`,
+  });
+  const candidates = await run({ issue: baseIssue, client });
+
+  assert.equal(candidates.length, 1);
+  assert.equal(requests.filter(({ method }) => method === "POST").length, 1);
+  const searchRequests = requests.filter(({ url }) => url.startsWith("/search/issues?"));
+  assert.equal(searchRequests.length, 1);
+  for (const searchRequest of searchRequests) {
+    const parameters = new URL(searchRequest.url, "http://localhost").searchParams;
+    assert.equal(parameters.get("search_type"), "hybrid");
+    assert.equal(parameters.get("per_page"), "20");
+    assert.match(parameters.get("q"), /^repo:t8y2\/dbx is:issue /u);
+    assert.ok(parameters.get("q").length < 600);
+  }
+});
+
+test("run treats hybrid search rate limits as best-effort", async () => {
+  const error = new Error("rate limit exceeded");
+  error.status = 403;
+  const client = {
+    hasExistingComment: async () => false,
+    searchIssues: async () => {
+      throw error;
+    },
+  };
+
+  assert.deepEqual(await run({ issue: baseIssue, client }), []);
+});
+
+test("run does not hide non-rate-limit permission failures", async () => {
+  const error = new Error("Resource not accessible by integration");
+  error.status = 403;
+  const client = {
+    hasExistingComment: async () => false,
+    searchIssues: async () => {
+      throw error;
+    },
+  };
+
+  await assert.rejects(() => run({ issue: baseIssue, client }), /Resource not accessible/u);
+});
+
+test("run skips search when its marker already exists", async () => {
+  let searched = false;
+  const client = {
+    hasExistingComment: async () => true,
+    searchIssues: async () => {
+      searched = true;
+      return { items: [] };
+    },
+  };
+
+  assert.deepEqual(await run({ issue: baseIssue, client }), []);
+  assert.equal(searched, false);
+});
diff --git a/.github/workflows/i18n-autofill.yml b/.github/workflows/i18n-autofill.yml
index 11a3f1c5bb..9664f43802 100644
--- a/.github/workflows/i18n-autofill.yml
+++ b/.github/workflows/i18n-autofill.yml
@@ -9,11 +9,7 @@ on:
       - ".github/workflows/i18n-autofill.yml"
 
 permissions:
-  contents: write
-  issues: write
-  # 需要 write 才能通过 gh pr comment (addComment) 在 PR 上发评论；
-  # 之前是 read，导致 autofill 成功 push 了翻译 commit 却无法发评论告知作者
-  pull-requests: write
+  contents: read
 
 concurrency:
   group: i18n-autofill-${{ github.event.pull_request.number }}
@@ -32,16 +28,27 @@ jobs:
       - name: Copy trusted script
         run: cp .github/scripts/i18n-autofill.mjs "$RUNNER_TEMP/i18n-autofill.mjs"
 
+      - name: Create DBX bot token
+        id: app-token
+        uses: actions/create-github-app-token@v3
+        with:
+          app-id: ${{ vars.DBX_BOT_APP_ID }}
+          private-key: ${{ secrets.DBX_BOT_PRIVATE_KEY }}
+          owner: ${{ github.repository_owner }}
+          repositories: dbx
+          permission-contents: write
+          permission-issues: write
+          permission-pull-requests: write
+
       - name: Checkout pull request branch
         uses: actions/checkout@v5
         with:
           repository: ${{ github.event.pull_request.head.repo.full_name }}
           ref: ${{ github.event.pull_request.head.sha }}
-          token: ${{ secrets.I18N_BOT_TOKEN || secrets.GITHUB_TOKEN }}
+          token: ${{ github.event.pull_request.head.repo.full_name == github.repository && steps.app-token.outputs.token || github.token }}
           fetch-depth: 0
           # The workflow executes the trusted base-branch script copied above;
           # fork contents are only parsed as translation data, never executed.
-          allow-unsafe-pr-checkout: true
 
       - name: Fetch base branch
         env:
@@ -66,6 +73,8 @@ jobs:
       - name: Commit and push translation patch
         id: patch
         env:
+          APP_SLUG: ${{ steps.app-token.outputs.app-slug }}
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
           PR_HEAD_REF: ${{ github.event.pull_request.head.ref }}
         run: |
           if git diff --quiet -- apps/desktop/src/i18n/locales; then
@@ -74,8 +83,9 @@ jobs:
             exit 0
           fi
 
-          git config user.name "dbx-i18n-bot"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
+          BOT_USER_ID="$(gh api "/users/${APP_SLUG}[bot]" --jq .id)"
+          git config user.name "${APP_SLUG}[bot]"
+          git config user.email "${BOT_USER_ID}+${APP_SLUG}[bot]@users.noreply.github.com"
           git add apps/desktop/src/i18n/locales
           git commit -m "chore(i18n): autofill new translations"
           if git push origin "HEAD:${PR_HEAD_REF}"; then
@@ -89,7 +99,7 @@ jobs:
       - name: Comment autofill result
         if: steps.patch.outputs.changed == 'true' && steps.patch.outputs.push_failed != 'true'
         env:
-          GH_TOKEN: ${{ secrets.I18N_BOT_TOKEN || secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
           SUMMARY_FILE: ${{ runner.temp }}/i18n-summary.json
           BODY_FILE: ${{ runner.temp }}/i18n-autofill-comment.md
@@ -120,7 +130,7 @@ jobs:
       - name: Comment push failure
         if: steps.patch.outputs.changed == 'true' && steps.patch.outputs.push_failed == 'true'
         env:
-          GH_TOKEN: ${{ secrets.I18N_BOT_TOKEN || secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
           SUMMARY_FILE: ${{ runner.temp }}/i18n-summary.json
           PATCH_FILE: ${{ runner.temp }}/i18n-autofill.patch
diff --git a/.github/workflows/similar-issues.yml b/.github/workflows/similar-issues.yml
new file mode 100644
index 0000000000..a25110a49c
--- /dev/null
+++ b/.github/workflows/similar-issues.yml
@@ -0,0 +1,39 @@
+name: Suggest Similar Issues
+
+on:
+  issues:
+    types: [opened]
+
+concurrency:
+  group: similar-issues-${{ github.event.issue.number }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  suggest:
+    runs-on: ubuntu-latest
+    if: ${{ !github.event.issue.pull_request }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Create DBX bot token
+        id: app-token
+        uses: actions/create-github-app-token@v3
+        with:
+          app-id: ${{ vars.DBX_BOT_APP_ID }}
+          private-key: ${{ secrets.DBX_BOT_PRIVATE_KEY }}
+          owner: ${{ github.repository_owner }}
+          repositories: dbx
+          permission-issues: write
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.13.0
+
+      - name: Suggest similar issues
+        run: node .github/scripts/suggest-similar-issues.mjs
+        env:
+          GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}