feat: duplicate-pair detection + logout-before-delete + ordering tests

Three connected bits of paired-account hygiene:

1. Duplicate-pair guard (apps/bot/src/ipc/pair-handler.ts)

   Operator scans the QR with a phone that's already linked to
   another account row → both rows would fight over the same
   WhatsApp device and sends become a coin flip. After Baileys'
   `open` event the bot now queries siblings of the same operator,
   passes them through findDuplicateExistingAccount() (a pure
   helper extracted to pair-state.ts), and on a hit:
     - stops the new session (intentional; keeps the original's
       session intact)
     - scrubs the partial auth blob from disk
     - resets the row's status to unpaired and clears phone_number
     - emits a new session.duplicate event with the existing row's
       label so PairLive can render a clear message
   New PairLive 'duplicate' phase: amber icon + "Phone already
   linked, unpair the existing account first or scan with a
   different phone".

2. Logout-before-delete (apps/bot/src/ipc/unpair-handler.ts +
   apps/bot/src/whatsapp/session-manager.ts)

   Delete used to call account.unpair which only closes the local
   socket — the operator's phone kept showing a phantom "linked
   device" pointing at a row that no longer exists. Added:
     - new account.delete command type (web side and bot side)
     - sessionManager.logoutAndStop(): calls socket.logout() so
       WhatsApp drops the device on the server side, THEN closes
       the local socket. Best-effort; logout RPC failure doesn't
       strand the delete.
     - new handleDelete() handler that calls logoutAndStop, removes
       session files, audits, and notifies.
     - deleteAccountAction now sends account.delete instead of
       account.unpair.
   Unpair stays unchanged — re-pair-friendly, no logout.

3. Tests (bot 77 → 88, web 477 → 480)

   - findDuplicateExistingAccount: 6 cases covering match, no-match,
     self-exclusion, null/empty/whitespace handling, whitespace
     normalisation, deterministic-pick when (defensively) two
     siblings share a phone.
   - handleUnpair / handleDelete: handleDelete calls logoutAndStop
     BEFORE rm; handleUnpair never touches logoutAndStop (regression
     guard for a refactor that swaps them); audit log payload
     includes the row's label; audit lookup throwing doesn't strand
     the delete.
   - listAccounts ordering: static guard against the rename-
     reshuffles-list regression. Pins `asc(a.createdAt)` + `asc(a.id)`
     and rejects `asc(a.label)` in the function body.

Bot restarted with the new flow.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/bot/src/ipc/command-consumer.ts

@@ -3,7 +3,7 @@ import type { Notification } from "pg";
 import { logger } from "../logger.js";
 import { env } from "../env.js";
 import { handleStartPairing } from "./pair-handler.js";
-import { handleUnpair } from "./unpair-handler.js";
+import { handleUnpair, handleDelete } from "./unpair-handler.js";
 import { handleSyncGroups } from "./sync-groups-handler.js";
 import { handleSendTest } from "./send-test-handler.js";
 import {
@@ -14,6 +14,11 @@ import {
 export type BotCommand =
   | { type: "account.start_pairing"; accountId: string }
   | { type: "account.unpair"; accountId: string }
+  // Like unpair, but tells WhatsApp to drop this device from the
+  // user's linked-devices list first via socket.logout(). The web
+  // action calls this immediately before deleting the row so the
+  // operator's phone doesn't keep showing a phantom linked device.
+  | { type: "account.delete"; accountId: string }
   | { type: "account.sync_groups"; accountId: string }
   | { type: "group.send_test"; groupId: string; text: string }
   | { type: "reminder.schedule"; reminderId: string; scheduledAtIso: string }
@@ -74,6 +79,9 @@ export function registerDefaultHandlers(): void {
   registerHandler("account.unpair", async (cmd) => {
     await handleUnpair(cmd.accountId);
   });
+  registerHandler("account.delete", async (cmd) => {
+    await handleDelete(cmd.accountId);
+  });
   registerHandler("account.sync_groups", async (cmd) => {
     await handleSyncGroups(cmd.accountId);
   });

apps/bot/src/ipc/notify.ts

@@ -10,6 +10,16 @@ export type WebEvent =
   | { type: "session.connected"; accountId: string; phoneNumber: string | null }
   | { type: "session.disconnected"; accountId: string }
   | { type: "session.timeout"; accountId: string }
+  // Operator scanned the QR with a phone that's already linked to another
+  // account row. We park the new pairing instead of letting two account
+  // rows fight over the same WhatsApp device. existingLabel surfaces in
+  // the UI so the operator knows which account already owns the phone.
+  | {
+      type: "session.duplicate";
+      accountId: string;
+      phoneNumber: string;
+      existingLabel: string;
+    }
   | { type: "groups.synced"; accountId: string; count: number }
   | {
       type: "reminder.fired";

apps/bot/src/ipc/pair-handler.ts

@@ -10,7 +10,11 @@ import { renderQrPng } from "../whatsapp/qr-renderer.js";
 import { syncGroupsForAccount } from "../whatsapp/group-sync.js";
 import { writeAuditLog } from "../audit.js";
 import { pgNotifyWeb } from "./notify.js";
-import { decidePairListenerOnClose, nextWarmingUpAfterEvent } from "./pair-state.js";
+import {
+  decidePairListenerOnClose,
+  findDuplicateExistingAccount,
+  nextWarmingUpAfterEvent,
+} from "./pair-state.js";
 
 const PAIR_TIMEOUT_MS = 5 * 60 * 1000;
 const offByAccount = new Map<string, () => void>();
@@ -126,6 +130,53 @@ export async function handleStartPairing(accountId: string): Promise<void> {
         }
         lastQrPayload.delete(id);
         offByAccount.delete(id);
+
+        // Duplicate-pair guard. Operator scanned the QR with a phone
+        // that's already linked to another account row. Letting both
+        // rows claim the same WhatsApp device confuses Baileys and
+        // turns sends into a coin flip — abandon this pairing and
+        // surface a clear message to the UI.
+        const siblings = await db.query.whatsappAccounts.findMany({
+          where: (a, { eq: dEq }) => dEq(a.operatorId, account.operatorId),
+          columns: { id: true, phoneNumber: true, label: true },
+        });
+        const dup = findDuplicateExistingAccount({
+          currentAccountId: id,
+          currentPhoneNumber: event.phoneNumber,
+          siblings,
+        });
+        if (dup) {
+          logger.warn(
+            {
+              accountId: id,
+              phoneNumber: event.phoneNumber,
+              existingAccountId: dup.existingAccountId,
+              existingLabel: dup.existingLabel,
+            },
+            "pair: duplicate phone — abandoning new pairing",
+          );
+          // Stop the duplicate session, scrub the partial auth blob,
+          // and reset the row's status. We DO NOT logout() here — the
+          // original account's session remains valid and the operator
+          // hasn't actually added a new linked device on the phone yet
+          // (it'd just be the freshly-completed scan, which Baileys
+          // hasn't yet committed to the WhatsApp side).
+          await sessionManager.stop(id, { intentional: true });
+          await rm(join(env.SESSIONS_DIR, id), { recursive: true, force: true });
+          await db
+            .update(whatsappAccounts)
+            .set({ status: "unpaired", lastQrPng: null, phoneNumber: null })
+            .where(eq(whatsappAccounts.id, id));
+          await pgNotifyWeb({
+            type: "session.duplicate",
+            accountId: id,
+            phoneNumber: event.phoneNumber!,
+            existingLabel: dup.existingLabel,
+          });
+          off();
+          return;
+        }
+
         const session = sessionManager.getSession(id);
         let synced = 0;
         if (session) {

apps/bot/src/ipc/pair-state.test.ts

@@ -3,6 +3,7 @@ import {
   decideOnPairClose,
   decideOnPairTimeout,
   decidePairListenerOnClose,
+  findDuplicateExistingAccount,
   nextWarmingUpAfterEvent,
   shouldAutoReconnect,
 } from "./pair-state.js";
@@ -204,3 +205,105 @@ describe("nextWarmingUpAfterEvent (pair-listener flag transitions)", () => {
     expect(warming).toBe(false);
   });
 });
+
+describe("findDuplicateExistingAccount (one-phone-per-account guard)", () => {
+  const sibling = (id: string, phone: string | null, label: string) => ({
+    id,
+    phoneNumber: phone,
+    label,
+  });
+
+  it("flags a sibling that already holds this phone number", () => {
+    const r = findDuplicateExistingAccount({
+      currentAccountId: "new",
+      currentPhoneNumber: "60123456789",
+      siblings: [
+        sibling("new", null, "scratch"),
+        sibling("existing", "60123456789", "Yiekheng-my"),
+        sibling("other", "60987654321", "WaBot Test"),
+      ],
+    });
+    expect(r).toEqual({
+      existingAccountId: "existing",
+      existingLabel: "Yiekheng-my",
+    });
+  });
+
+  it("returns null when the phone is unique", () => {
+    const r = findDuplicateExistingAccount({
+      currentAccountId: "new",
+      currentPhoneNumber: "60123456789",
+      siblings: [
+        sibling("new", null, "scratch"),
+        sibling("other", "60987654321", "WaBot"),
+      ],
+    });
+    expect(r).toBeNull();
+  });
+
+  it("excludes the current account from comparison (a row's own phone isn't a 'duplicate')", () => {
+    // After session-manager.handleEvent runs first it has already
+    // written phone_number on the current row. The check must skip
+    // that row, otherwise EVERY successful pair would match itself
+    // and look like a duplicate.
+    const r = findDuplicateExistingAccount({
+      currentAccountId: "self",
+      currentPhoneNumber: "60123456789",
+      siblings: [sibling("self", "60123456789", "Self")],
+    });
+    expect(r).toBeNull();
+  });
+
+  it("returns null for null/empty/whitespace phone numbers (don't false-positive on unset)", () => {
+    const siblings = [
+      sibling("new", null, "scratch"),
+      sibling("a", null, "Old A"),
+      sibling("b", "", "Old B"),
+      sibling("c", "  ", "Old C"),
+    ];
+    expect(
+      findDuplicateExistingAccount({
+        currentAccountId: "new",
+        currentPhoneNumber: null,
+        siblings,
+      }),
+    ).toBeNull();
+    expect(
+      findDuplicateExistingAccount({
+        currentAccountId: "new",
+        currentPhoneNumber: "",
+        siblings,
+      }),
+    ).toBeNull();
+    expect(
+      findDuplicateExistingAccount({
+        currentAccountId: "new",
+        currentPhoneNumber: "   ",
+        siblings,
+      }),
+    ).toBeNull();
+  });
+
+  it("normalises whitespace on both sides before comparing", () => {
+    const r = findDuplicateExistingAccount({
+      currentAccountId: "new",
+      currentPhoneNumber: "  60123456789  ",
+      siblings: [sibling("existing", "60123456789", "Existing")],
+    });
+    expect(r?.existingAccountId).toBe("existing");
+  });
+
+  it("picks the FIRST matching sibling when (somehow) two rows share the phone", () => {
+    // Defensive: this state shouldn't exist in production but the helper
+    // should at least be deterministic so the message is consistent.
+    const r = findDuplicateExistingAccount({
+      currentAccountId: "new",
+      currentPhoneNumber: "60123456789",
+      siblings: [
+        sibling("first", "60123456789", "First"),
+        sibling("second", "60123456789", "Second"),
+      ],
+    });
+    expect(r?.existingAccountId).toBe("first");
+  });
+});

apps/bot/src/ipc/pair-state.ts

@@ -141,3 +141,45 @@ export function nextWarmingUpAfterEvent(input: {
   if (input.event === "close" && input.restartRequired) return true;
   return input.warmingUp;
 }
+
+/**
+ * Decide whether a freshly-paired account is a duplicate of an
+ * existing account row owned by the same operator. The operator
+ * cannot legitimately link the same WhatsApp number to two account
+ * rows — Baileys keeps one auth blob per phone and the second row
+ * would just hijack the first's session.
+ *
+ * Inputs:
+ *   - `currentAccountId`   the row that just received the open event
+ *   - `currentPhoneNumber` the JID-derived phone string (or null)
+ *   - `siblings`           every other operator-owned account row
+ *
+ * Returns `null` if the phone is unique (proceed normally), or a
+ * descriptor with the existing-row's id+label so the caller can park
+ * the duplicate row and surface a clear "already linked" message to
+ * the UI. A null/empty phone never reports a duplicate (we'd be
+ * comparing apples and we'd block legitimate first pairs that
+ * haven't received the WID yet).
+ */
+export interface DuplicatePairInput {
+  currentAccountId: string;
+  currentPhoneNumber: string | null | undefined;
+  siblings: Array<{ id: string; phoneNumber: string | null; label: string }>;
+}
+export interface DuplicatePairFinding {
+  existingAccountId: string;
+  existingLabel: string;
+}
+export function findDuplicateExistingAccount(
+  input: DuplicatePairInput,
+): DuplicatePairFinding | null {
+  const phone = (input.currentPhoneNumber ?? "").trim();
+  if (!phone) return null;
+  for (const s of input.siblings) {
+    if (s.id === input.currentAccountId) continue;
+    if ((s.phoneNumber ?? "").trim() === phone) {
+      return { existingAccountId: s.id, existingLabel: s.label };
+    }
+  }
+  return null;
+}

apps/bot/src/ipc/unpair-handler.test.ts

@@ -0,0 +1,128 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+// Hoisted spies so the vi.mock factories can reach them.
+const {
+  stopMock,
+  logoutAndStopMock,
+  rmMock,
+  findFirstMock,
+  writeAuditLogMock,
+  pgNotifyWebMock,
+} = vi.hoisted(() => ({
+  stopMock: vi.fn(async () => undefined),
+  logoutAndStopMock: vi.fn(async () => undefined),
+  rmMock: vi.fn(async () => undefined),
+  findFirstMock: vi.fn(async () => ({ operatorId: "op-1", label: "WaBot" })),
+  writeAuditLogMock: vi.fn(async () => undefined),
+  pgNotifyWebMock: vi.fn(async () => undefined),
+}));
+
+vi.mock("node:fs/promises", () => ({
+  rm: (...args: unknown[]) => rmMock(...args),
+}));
+vi.mock("../db.js", () => ({
+  db: {
+    query: { whatsappAccounts: { findFirst: (...a: unknown[]) => findFirstMock(...a) } },
+  },
+}));
+vi.mock("../env.js", () => ({ env: { SESSIONS_DIR: "/data/sessions" } }));
+vi.mock("../whatsapp/session-manager.js", () => ({
+  sessionManager: {
+    stop: (...a: unknown[]) => stopMock(...a),
+    logoutAndStop: (...a: unknown[]) => logoutAndStopMock(...a),
+  },
+}));
+vi.mock("../audit.js", () => ({
+  writeAuditLog: (...a: unknown[]) => writeAuditLogMock(...a),
+}));
+vi.mock("./notify.js", () => ({
+  pgNotifyWeb: (...a: unknown[]) => pgNotifyWebMock(...a),
+}));
+vi.mock("../logger.js", () => ({
+  logger: { warn: vi.fn(), info: vi.fn(), error: vi.fn() },
+}));
+
+import { handleUnpair, handleDelete } from "./unpair-handler.js";
+
+beforeEach(() => {
+  stopMock.mockReset();
+  stopMock.mockResolvedValue(undefined);
+  logoutAndStopMock.mockReset();
+  logoutAndStopMock.mockResolvedValue(undefined);
+  rmMock.mockReset();
+  rmMock.mockResolvedValue(undefined);
+  findFirstMock.mockReset();
+  findFirstMock.mockResolvedValue({ operatorId: "op-1", label: "WaBot" });
+  writeAuditLogMock.mockReset();
+  writeAuditLogMock.mockResolvedValue(undefined);
+  pgNotifyWebMock.mockReset();
+  pgNotifyWebMock.mockResolvedValue(undefined);
+});
+
+describe("handleUnpair", () => {
+  it("stops the session WITHOUT logout, removes files, audits, notifies", async () => {
+    await handleUnpair("acct-A");
+    // The unpair flow MUST NOT call logoutAndStop — that would tell
+    // WhatsApp to drop the linked device, which the operator might
+    // re-pair shortly after. logoutAndStop is only for permanent
+    // delete.
+    expect(logoutAndStopMock).not.toHaveBeenCalled();
+    expect(stopMock).toHaveBeenCalledWith("acct-A", { intentional: true });
+    expect(rmMock).toHaveBeenCalled();
+    expect(writeAuditLogMock).toHaveBeenCalledWith(
+      expect.anything(),
+      expect.objectContaining({ action: "account.unpaired", targetId: "acct-A" }),
+    );
+    expect(pgNotifyWebMock).toHaveBeenCalledWith({
+      type: "session.disconnected",
+      accountId: "acct-A",
+    });
+  });
+});
+
+describe("handleDelete (logout-before-teardown)", () => {
+  it("calls logoutAndStop BEFORE rm so WhatsApp drops the linked device first", async () => {
+    await handleDelete("acct-A");
+    expect(logoutAndStopMock).toHaveBeenCalledTimes(1);
+    expect(logoutAndStopMock).toHaveBeenCalledWith("acct-A");
+    expect(rmMock).toHaveBeenCalledTimes(1);
+    // Order: logout-and-stop must invoke before rm (otherwise the
+    // socket was torn down on disk before WhatsApp could be told to
+    // drop the linked device).
+    expect(logoutAndStopMock.mock.invocationCallOrder[0]).toBeLessThan(
+      rmMock.mock.invocationCallOrder[0]!,
+    );
+  });
+
+  it("does NOT call the plain stop() — that's reserved for unpair", async () => {
+    // Sanity guard: a refactor that swaps logoutAndStop for stop()
+    // would silently regress the linked-device cleanup. The test
+    // pins the contract.
+    await handleDelete("acct-A");
+    expect(stopMock).not.toHaveBeenCalled();
+  });
+
+  it("writes an account.deleted audit log carrying the row's label", async () => {
+    findFirstMock.mockResolvedValueOnce({ operatorId: "op-7", label: "Yiekheng-my" });
+    await handleDelete("acct-X");
+    expect(writeAuditLogMock).toHaveBeenCalledWith(
+      expect.anything(),
+      expect.objectContaining({
+        action: "account.deleted",
+        operatorId: "op-7",
+        targetId: "acct-X",
+        payload: { label: "Yiekheng-my" },
+      }),
+    );
+  });
+
+  it("still completes when the audit-log lookup fails (best-effort)", async () => {
+    // The web action runs the cascade DELETE right after; if the row
+    // is gone before this handler reads it, the audit lookup throws.
+    // Delete must not strand on that.
+    findFirstMock.mockRejectedValueOnce(new Error("no such row"));
+    await expect(handleDelete("acct-A")).resolves.toBeUndefined();
+    expect(rmMock).toHaveBeenCalled();
+    expect(pgNotifyWebMock).toHaveBeenCalled();
+  });
+});

apps/bot/src/ipc/unpair-handler.ts

@@ -39,3 +39,41 @@ export async function handleUnpair(accountId: string): Promise<void> {
   }
   await pgNotifyWeb({ type: "session.disconnected", accountId });
 }
+
+/**
+ * Delete-account flow on the bot side. Distinct from unpair because
+ * we want WhatsApp to drop this device from the user's linked-devices
+ * list — otherwise the phone keeps showing a phantom entry that has
+ * to be manually removed from WhatsApp's UI.
+ *
+ * Order is important:
+ *   1. socket.logout() over the still-connected socket → WhatsApp
+ *      removes the linked device on the server side.
+ *   2. close() the local Baileys session.
+ *   3. rm() the on-disk auth blob so the next pairing starts clean.
+ *
+ * Step 1 is best-effort — if the socket is already torn down or the
+ * RPC fails the delete still proceeds. The web action then deletes
+ * the row (cascade FKs handle groups/reminders/runs).
+ */
+export async function handleDelete(accountId: string): Promise<void> {
+  await sessionManager.logoutAndStop(accountId);
+  await rm(join(env.SESSIONS_DIR, accountId), { recursive: true, force: true });
+  try {
+    const row = await db.query.whatsappAccounts.findFirst({
+      where: (a, { eq }) => eq(a.id, accountId),
+      columns: { operatorId: true, label: true },
+    });
+    await writeAuditLog(db, {
+      operatorId: row?.operatorId ?? null,
+      source: "web",
+      action: "account.deleted",
+      targetType: "whatsapp_account",
+      targetId: accountId,
+      payload: { label: row?.label ?? null },
+    });
+  } catch (err) {
+    logger.warn({ err, accountId }, "delete: audit log failed (non-fatal)");
+  }
+  await pgNotifyWeb({ type: "session.disconnected", accountId });
+}

apps/bot/src/whatsapp/session-manager.ts

@@ -120,6 +120,44 @@ class SessionManager {
     this.sessions.delete(accountId);
   }
 
+  /**
+   * Tell WhatsApp to remove this device from the linked-devices list,
+   * then close the socket. Used by the delete-account flow so the
+   * operator's phone doesn't keep showing a phantom "linked device"
+   * pointing at a row that no longer exists. Best-effort: if the
+   * socket is already torn down or the logout RPC fails (network
+   * blip, already-disconnected, etc.) we still proceed to close +
+   * teardown — no point stranding the delete because WhatsApp didn't
+   * acknowledge.
+   */
+  async logoutAndStop(accountId: string): Promise<void> {
+    const timer = this.reconnectTimers.get(accountId);
+    if (timer) {
+      clearTimeout(timer);
+      this.reconnectTimers.delete(accountId);
+    }
+    const session = this.sessions.get(accountId);
+    if (!session) return;
+    // Suppress reconnect/handleEvent bookkeeping for the close that
+    // logout() emits — the row is about to be deleted entirely so
+    // status writes are pointless.
+    this.intentionalStops.add(accountId);
+    try {
+      await session.socket.logout();
+    } catch (err) {
+      logger.warn(
+        { err, accountId },
+        "session-manager: socket.logout() failed (continuing with teardown)",
+      );
+    }
+    try {
+      await session.close();
+    } catch (err) {
+      logger.warn({ err, accountId }, "session-manager: post-logout close failed");
+    }
+    this.sessions.delete(accountId);
+  }
+
   async stopAll(): Promise<void> {
     await Promise.all([...this.sessions.keys()].map((id) => this.stop(id)));
   }

apps/web/src/actions/accounts.ts

@@ -193,8 +193,12 @@ export async function deleteAccountAction(formData: FormData): Promise<void> {
     where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, op.id)),
   });
   if (!account) return;
-  // Stop any live session / clean session files first.
-  await pgNotifyBot({ type: "account.unpair", accountId });
+  // Tell the bot to logout() over the live socket FIRST (so WhatsApp
+  // drops this device from the operator's linked-devices list), then
+  // close + remove session files. Distinct from account.unpair which
+  // never calls logout — keeping linked-devices clean is specific to
+  // the delete flow.
+  await pgNotifyBot({ type: "account.delete", accountId });
   // Cascade FKs handle groups, reminders, runs, run_targets, messages.
   await db.delete(whatsappAccounts).where(eq(whatsappAccounts.id, accountId));
   revalidatePath("/accounts");

apps/web/src/components/pair-live.tsx

@@ -18,7 +18,8 @@ type PairingState =
   | { phase: "waiting" }
   | { phase: "qr"; qrUrl: string }
   | { phase: "connected"; phoneNumber: string }
-  | { phase: "timeout" };
+  | { phase: "timeout" }
+  | { phase: "duplicate"; phoneNumber: string; existingLabel: string };
 
 interface PairLiveProps {
   accountId: string;
@@ -112,6 +113,15 @@ export function PairLive({ accountId, label }: PairLiveProps) {
       if (timerRef.current) clearInterval(timerRef.current);
       setPairingState({ phase: "timeout" });
     },
+    "session.duplicate": (data) => {
+      if (data.accountId !== accountId) return;
+      if (timerRef.current) clearInterval(timerRef.current);
+      setPairingState({
+        phase: "duplicate",
+        phoneNumber: data.phoneNumber,
+        existingLabel: data.existingLabel,
+      });
+    },
   });
 
   // Auto-redirect on connected
@@ -234,6 +244,35 @@ export function PairLive({ accountId, label }: PairLiveProps) {
           </Button>
         </div>
       )}
+
+      {pairingState.phase === "duplicate" && (
+        <div className="flex flex-col items-center gap-4 text-center">
+          <div className="flex size-16 items-center justify-center rounded-full bg-amber-500/15">
+            <XCircleIcon className="size-8 text-amber-600 dark:text-amber-400" />
+          </div>
+          <div className="space-y-1">
+            <p className="text-base font-semibold">Phone already linked</p>
+            <p className="text-xs text-muted-foreground">
+              <span className="font-mono">
+                +{pairingState.phoneNumber.replace(/^\+/, "")}
+              </span>{" "}
+              is already paired to{" "}
+              <span className="font-medium text-foreground">
+                {pairingState.existingLabel}
+              </span>
+              . Each WhatsApp number can only be linked to one account here.
+              Unpair the existing account first, or scan with a different
+              phone.
+            </p>
+          </div>
+          <Button asChild size="sm">
+            {/* eslint-disable-next-line @typescript-eslint/no-explicit-any */}
+            <Link href={`/accounts/${accountId}` as any}>
+              Back to accounts
+            </Link>
+          </Button>
+        </div>
+      )}
     </div>
   );
 }

apps/web/src/hooks/use-events.ts

@@ -9,6 +9,11 @@ export type WebEventMap = {
   "session.connected": { accountId: string; phoneNumber: string | null };
   "session.disconnected": { accountId: string };
   "session.timeout": { accountId: string };
+  "session.duplicate": {
+    accountId: string;
+    phoneNumber: string;
+    existingLabel: string;
+  };
   "groups.synced": { accountId: string; count: number };
   "reminder.fired": {
     reminderId: string;

apps/web/src/lib/list-accounts-order.test.ts

@@ -0,0 +1,49 @@
+import { describe, it, expect } from "vitest";
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+/**
+ * Static guard: listAccounts() in apps/web/src/lib/queries.ts MUST
+ * order rows by createdAt ascending (with id as a deterministic
+ * tiebreaker) so the operator's earliest-added account stays on top.
+ *
+ * Earlier the orderBy used `asc(a.label)` which silently re-shuffled
+ * the list every time an account was renamed. This test pins the
+ * fix in source so a future refactor can't quietly bring the rename
+ * regression back.
+ *
+ * It's a static (regex) guard rather than an integration test
+ * because the live query needs Postgres + a seeded operator;
+ * pinning the source spelling keeps coverage cheap and CI-friendly.
+ */
+describe("listAccounts ordering (regression guard)", () => {
+  const src = readFileSync(
+    join(__dirname, "queries.ts"),
+    "utf8",
+  );
+
+  it("orders by created_at ASC", () => {
+    // Match across whitespace/comments inside listAccounts. Anchors:
+    // function header → orderBy → asc(a.createdAt).
+    const fnStart = src.indexOf("export async function listAccounts(");
+    expect(fnStart).toBeGreaterThan(-1);
+    const fnEnd = src.indexOf("export async function ", fnStart + 1);
+    const fnBody = src.slice(fnStart, fnEnd > -1 ? fnEnd : undefined);
+    expect(fnBody).toMatch(/orderBy:[\s\S]*asc\(a\.createdAt\)/);
+  });
+
+  it("uses id as a deterministic tiebreaker for ties on createdAt", () => {
+    const fnStart = src.indexOf("export async function listAccounts(");
+    const fnEnd = src.indexOf("export async function ", fnStart + 1);
+    const fnBody = src.slice(fnStart, fnEnd > -1 ? fnEnd : undefined);
+    expect(fnBody).toMatch(/asc\(a\.id\)/);
+  });
+
+  it("does NOT order by label (the regression we're guarding against)", () => {
+    const fnStart = src.indexOf("export async function listAccounts(");
+    const fnEnd = src.indexOf("export async function ", fnStart + 1);
+    const fnBody = src.slice(fnStart, fnEnd > -1 ? fnEnd : undefined);
+    expect(fnBody).not.toMatch(/asc\(a\.label\)/);
+    expect(fnBody).not.toMatch(/desc\(a\.label\)/);
+  });
+});

apps/web/src/lib/notify.ts

@@ -5,6 +5,10 @@ import { db } from "./db";
 export type BotCommand =
   | { type: "account.start_pairing"; accountId: string }
   | { type: "account.unpair"; accountId: string }
+  // Like account.unpair, but the bot also calls socket.logout() so
+  // WhatsApp drops this device from the operator's linked-devices
+  // list before the row is deleted.
+  | { type: "account.delete"; accountId: string }
   | { type: "account.sync_groups"; accountId: string }
   | { type: "group.send_test"; groupId: string; text: string }
   | { type: "reminder.schedule"; reminderId: string; scheduledAtIso: string }