diff --git a/CLAUDE.md b/CLAUDE.md
index 1700282b..60d02919 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,6 +1,6 @@
 # Claude Code Working Guide
 
-_Last synced: v2.8.67 (2026-11-03) — user chat removed (reverted)._ A change that makes any statement in this file, `AGENTS.md`, or a README wrong — a moved path, a new or changed extension point, a retired rule — updates that file in the same change-set and bumps this marker. **Bump = replace the version/date and a ≤ 1-line summary; never append a changelog here** — details belong in the commit message and `docs/`, because this whole file is loaded into every session.
+_Last synced: v2.8.67 (2026-11-03) — user chat removed; its tables and uploads are dropped at start._ A change that makes any statement in this file, `AGENTS.md`, or a README wrong — a moved path, a new or changed extension point, a retired rule — updates that file in the same change-set and bumps this marker. **Bump = replace the version/date and a ≤ 1-line summary; never append a changelog here** — details belong in the commit message and `docs/`, because this whole file is loaded into every session.
 
 ## Project mission
 - Maintain a reliable local-first dashboard for Claude Code session monitoring.
diff --git a/client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap b/client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap
index 30945b78..85ad382f 100644
--- a/client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap
+++ b/client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap
@@ -7316,7 +7316,7 @@ exports[`screen snapshots > Settings — about 1`] = `
                 <span
                   class="text-status-warning/90"
                 >
-                  UI build v2.8.66 (rebuild client to match)
+                  UI build v2.8.67 (rebuild client to match)
                 </span>
               </p>
             </div>
diff --git a/package-lock.json b/package-lock.json
index eacc29d3..25e08404 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "agenthub",
-  "version": "2.8.66",
+  "version": "2.8.67",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "agenthub",
-      "version": "2.8.66",
+      "version": "2.8.67",
       "hasInstallScript": true,
       "license": "UNLICENSED",
       "dependencies": {
diff --git a/package.json b/package.json
index 18914d07..32ee55ee 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "agenthub",
-  "version": "2.8.66",
+  "version": "2.8.67",
   "bin": {
     "agenthub": "bin/agenthub.js"
   },
diff --git a/server/db.js b/server/db.js
index ad0acd69..91978c1a 100644
--- a/server/db.js
+++ b/server/db.js
@@ -1854,6 +1854,22 @@ try {
   db.prepare("ALTER TABLE dashboard_runs ADD COLUMN chat_token_hash TEXT").run();
 }
 
+// v2.8.65–2.8.66 shipped a chat between users (chat_* tables, uploads under
+// <data dir>/chat/); it was removed in v2.8.67, and its data goes with it.
+try {
+  db.exec(`
+    DROP TABLE IF EXISTS chat_files;
+    DROP TABLE IF EXISTS chat_messages;
+    DROP TABLE IF EXISTS chat_members;
+    DROP TABLE IF EXISTS chat_rooms;
+  `);
+  if (!process.env.DASHBOARD_DB_PATH) {
+    fs.rmSync(path.join(getDataDir(), "chat"), { recursive: true, force: true });
+  }
+} catch {
+  /* best effort: a leftover is unused */
+}
+
 // Server mode: whose browser a push subscription is (`users.id`); NULL in
 // local mode. A user's notifications go only to their own subscriptions.
 try {