diff --git a/apps/e2e/src/tests/demo-role.test.ts b/apps/e2e/src/tests/demo-role.test.ts
index e7cf1ff92..871fbe345 100644
--- a/apps/e2e/src/tests/demo-role.test.ts
+++ b/apps/e2e/src/tests/demo-role.test.ts
@@ -132,7 +132,7 @@ describe.skipIf(!hasSqlite3())('a published demo', () => {
     ];
     for (const r of refused) {
       expect(r.status, JSON.stringify(r.json)).toBe(403);
-      expect(r.json.error).toMatch(/read-only demo/);
+      expect(r.json.error).toMatch(/read-only/);
     }
     // A write SQL statement is refused by the permissions the Demo role lacks.
     const conn = (await api('GET', '/connections', undefined, demoCookie)).json.connections.find(
diff --git a/apps/web/src/frontend/app/shell/DemoBanner.tsx b/apps/web/src/frontend/app/shell/DemoBanner.tsx
index e0a892c8f..c58d72750 100644
--- a/apps/web/src/frontend/app/shell/DemoBanner.tsx
+++ b/apps/web/src/frontend/app/shell/DemoBanner.tsx
@@ -8,12 +8,12 @@
  */
 import React from 'react';
 import { Eye } from 'lucide-react';
-import { isDemoRole } from '@foxschema/shared';
 import { useAuthStore } from '@/platform/authStore';
 
 export const DemoBanner: React.FC = () => {
   const demo = useAuthStore((s) => s.demo);
-  const role = useAuthStore((s) => s.user?.role);
+  /** Read-only: the account cannot save (the Demo role, or any role without app.write). */
+  const readOnly = useAuthStore((s) => s.user != null && !s.can('app.write'));
   if (!demo?.on) return null;
   return (
     <div
@@ -24,7 +24,7 @@ export const DemoBanner: React.FC = () => {
       <Eye className="w-3.5 h-3.5 text-sky-300 shrink-0" />
       <span className="font-bold">Demo</span>
       <span className="text-sky-200/90">
-        {isDemoRole(role)
+        {readOnly
           ? 'Explore the sample databases: browse, compare, and run queries. Nothing here can be saved or changed.'
           : 'Demo mode is on: visitors see this banner, and the sign-in page shows the demo login.'}
       </span>
diff --git a/apps/web/src/frontend/app/shell/ProfileMenu.tsx b/apps/web/src/frontend/app/shell/ProfileMenu.tsx
index 6cc55d790..4ab4f8625 100644
--- a/apps/web/src/frontend/app/shell/ProfileMenu.tsx
+++ b/apps/web/src/frontend/app/shell/ProfileMenu.tsx
@@ -1,5 +1,4 @@
 import React, { lazy, useEffect, useRef, useState } from 'react';
-import { isDemoRole } from '@foxschema/shared';
 import { createPortal } from 'react-dom';
 import { LogOut, Palette, ArrowUpCircle, Globe, Shield, MonitorX, MessageSquarePlus, UserPlus } from 'lucide-react';
 import { apiSignOutOthers } from '@/shared/api/authApi';
@@ -23,6 +22,8 @@ export function ProfileMenu(): React.ReactElement | null {
   const { user, logout, launch } = useAuthStore();
   const setActiveView = useUiStore((s) => s.setActiveView);
   const canAdminAccess = useAuthStore((s) => s.can('admin.users') || s.can('admin.roles'));
+  /** A shared login (the Demo role) does not run its own account; the server refuses it too. */
+  const managesOwnAccount = useAuthStore((s) => s.can('account.self'));
   const setRegisterDialogOpen = useAuthStore((s) => s.setRegisterDialogOpen);
   const [open, setOpen] = useState(false);
   const [showAdmin, setShowAdmin] = useState(false);
@@ -159,8 +160,8 @@ export function ProfileMenu(): React.ReactElement | null {
             <Globe className="w-4 h-4" /> foxschema.com
           </a>
 
-          {/* A demo login is every visitor at once; the server refuses this for it. */}
-          {!isDemoRole(user?.role) && (
+          {/* A shared login is every visitor at once; the server refuses this for it. */}
+          {managesOwnAccount && (
             <button
               type="button"
               data-testid="profile-sign-out-others"
diff --git a/docs/DEPLOYMENT.md b/docs/DEPLOYMENT.md
index b598d04a4..798195248 100644
--- a/docs/DEPLOYMENT.md
+++ b/docs/DEPLOYMENT.md
@@ -471,6 +471,13 @@ settings make that safe:
   demo account) or sign the other visitors out. Its permissions are edited like
   any role's; adding `editor.dml` there turns the demo into a sandbox, since
   the SQL it may run follows those permissions.
+
+  Read-only is a permission, not the role's name: the Demo role is simply the
+  one without **Save and change** (`app.write`) and **Manage own account**
+  (`account.self`). Remove `app.write` from any role and its accounts read only
+  too; give it to Demo and the demo can save. Without it, an account may call a
+  route only if it is a GET or declares that it reads (running a SELECT,
+  comparing, loading a schema, its own preferences, switching workspace).
 - **Demo mode** (Access control → Sign-in → Demo mode). Shows a demo banner on
   every page and your sign-in hint — typically the shared login — on the
   sign-in page. Anyone can read the hint.
diff --git a/packages/server/src/api/demo-account.test.ts b/packages/server/src/api/demo-account.test.ts
index 49c0313c3..bf1fa4d4e 100644
--- a/packages/server/src/api/demo-account.test.ts
+++ b/packages/server/src/api/demo-account.test.ts
@@ -18,7 +18,7 @@ process.env.APP_ENCRYPTION_KEY ||= '0'.repeat(64);
 
 import { DEFAULT_ROLE_PERMISSIONS } from '@foxschema/shared';
 import { getStore } from '../database/store';
-import { DEMO_ALLOWED_WRITES, DEMO_READ_ONLY } from '../platform/authorization/demo-access';
+import { READ_ONLY_ACCOUNT as DEMO_READ_ONLY } from '../platform/authorization/read-only';
 import { FEATURES, createFeatureContext } from '../app/feature-registry';
 
 let port = 0;
@@ -29,17 +29,34 @@ let demoId = '';
 let viewer = '';
 
 /** Every route the features mount, with its mount's access, built once. */
-let routeTable: Array<{ method: string; path: string; access: string }> | null = null;
+let routeTable: Array<{ method: string; path: string; access: string; reads: boolean }> | null = null;
 function mountedRoutes() {
   if (!routeTable) {
     const ctx = createFeatureContext();
     routeTable = FEATURES.flatMap((f) => f.mounts).flatMap((m) =>
-      m.routes(ctx).flatten(m.prefix).map((r) => ({ method: r.method, path: r.path, access: m.access }))
+      m.routes(ctx).flatten(m.prefix).map((r) => ({ method: r.method, path: r.path, access: m.access, reads: r.reads === true }))
     );
   }
   return routeTable;
 }
 
+/**
+ * The writes declared to only read (`reads` beside their handler). A read-only
+ * account (the Demo role) may call exactly these: adding one here is a review
+ * of whether it really changes nothing a visitor would share.
+ */
+const REVIEWED_READS = [
+  'POST /api/compare',
+  'POST /api/schema/db-access',
+  'POST /api/schema/list',
+  'POST /api/schema/load',
+  'POST /api/schema/table-insight',
+  'POST /api/sql/code-cell/transpile',
+  'POST /api/sql/execute',
+  'POST /api/workspaces/:id/select',
+  'PUT /api/user/preferences',
+];
+
 const DEMO_EMAIL = 'demo-visitor@example.com';
 const DEMO_PASSWORD = 'shared-demo-login-9';
 
@@ -126,7 +143,7 @@ describe('a demo account', () => {
   it('is refused every write behind sign-in except the few that read — before the route runs', async () => {
     const guarded = mountedRoutes().filter((r) => (r.access === 'user' || r.access === 'registered') && r.method !== 'GET');
     expect(guarded.length).toBeGreaterThan(50);
-    const allowed = new Set(DEMO_ALLOWED_WRITES.map((r) => `${r.method} ${r.path}`));
+    const allowed = new Set(guarded.filter((r) => r.reads).map((r) => `${r.method} ${r.path}`));
 
     const wrong: string[] = [];
     for (const route of guarded) {
@@ -139,9 +156,12 @@ describe('a demo account', () => {
     expect(wrong, 'allow-listed routes must pass the guard; every other write must be refused').toEqual([]);
   }, 120_000);
 
-  it('lists only routes that exist — a renamed route fails here instead of closing quietly', () => {
-    const served = new Set(mountedRoutes().map((r) => `${r.method} ${r.path}`));
-    expect(DEMO_ALLOWED_WRITES.map((r) => `${r.method} ${r.path}`).filter((k) => !served.has(k))).toEqual([]);
+  it('declares reads on exactly the reviewed writes — a new one is a deliberate change here', () => {
+    const declared = mountedRoutes()
+      .filter((r) => r.reads && r.method !== 'GET')
+      .map((r) => `${r.method} ${r.path}`)
+      .sort();
+    expect(declared).toEqual(REVIEWED_READS);
   });
 
   it('runs the reads it is allowed: the guard lets them through to their own checks', async () => {
diff --git a/packages/server/src/features/access/access.routes.ts b/packages/server/src/features/access/access.routes.ts
index 7080fb1a8..7228ebd0f 100644
--- a/packages/server/src/features/access/access.routes.ts
+++ b/packages/server/src/features/access/access.routes.ts
@@ -9,7 +9,7 @@ import { scopeOf } from '../../platform/http/scope';
 import type { WorkspaceScope } from '../../platform/http/scope';
 import type { FastifyReply } from 'fastify';
 import type { AppRequest } from '../../platform/http/types';
-import { Router } from '../../platform/http/router';
+import { Router, reads } from '../../platform/http/router';
 import type { ConnectionModule } from '@foxschema/db';
 import { requireAnyPermission, requirePermissions } from '../../platform/authorization/rbac.guard';
 import { rateLimit } from '../../platform/guards/rate-limit';
@@ -195,6 +195,7 @@ export function createAccessRoutes(deps: AccessRouteDeps): Router {
 
   router.post(
     '/schema/db-access',
+    reads,
     dbAccessLimiter,
     // Access workspace tabs use access.*; Utilities → Database Access uses
     // utility.access. Either family may load the catalog.
diff --git a/packages/server/src/features/auth/auth.routes.test.ts b/packages/server/src/features/auth/auth.routes.test.ts
index f5caf166b..b59c6225e 100644
--- a/packages/server/src/features/auth/auth.routes.test.ts
+++ b/packages/server/src/features/auth/auth.routes.test.ts
@@ -17,7 +17,7 @@ import type { AuthMailer } from '../../platform/identity/auth-mail';
 import type { SignupModule } from '../users';
 import { createAuthRoutes } from './auth.routes';
 
-const USER = { id: 'u-1', email: 'u-1@example.test', role: 'editor' };
+const USER = { id: 'u-1', email: 'u-1@example.test', role: 'editor', permissions: ['app.write', 'account.self'] };
 const WORKSPACE = { id: 'personal-u-1', name: 'Personal' };
 
 function routes() {
diff --git a/packages/server/src/features/auth/auth.routes.ts b/packages/server/src/features/auth/auth.routes.ts
index 0d5f19114..6c77968fd 100644
--- a/packages/server/src/features/auth/auth.routes.ts
+++ b/packages/server/src/features/auth/auth.routes.ts
@@ -13,8 +13,7 @@ import { DemoMode } from '../../platform/identity/demo-mode.service';
 import { SignupModule } from '../users';
 import { AppSettingsStore } from '../../platform/settings/app-settings.service';
 import { sendError } from '../../platform/http/respond';
-import { DEMO_READ_ONLY } from '../../platform/authorization/demo-access';
-import { isDemoRole } from '@foxschema/shared';
+import { READ_ONLY_ACCOUNT } from '../../platform/authorization/read-only';
 import { ServiceError } from '../../platform/contracts/actor';
 import { rateLimit } from '../../platform/guards/rate-limit';
 import { getLogger } from '../../platform/logger/logger';
@@ -146,9 +145,10 @@ export function createAuthRoutes(
       sendError(res, 'unauthenticated', 'Sign in to verify your email.');
       return;
     }
-    // Any visitor could mail the demo address over and over: its profile is locked.
-    if (isDemoRole(session.user.role)) {
-      sendError(res, 'forbidden', DEMO_READ_ONLY);
+    // A shared login (the Demo role) does not manage its own account: any
+    // visitor could mail its address over and over.
+    if (!session.user.permissions.includes('account.self')) {
+      sendError(res, 'forbidden', READ_ONLY_ACCOUNT);
       return;
     }
     if ((await auth.emailVerification(session.user.id)).verified) {
@@ -253,9 +253,9 @@ export function createAuthRoutes(
       sendError(res, 'unauthenticated', 'Authentication required');
       return;
     }
-    // A demo login is every visitor at once: this would sign all the others out.
-    if (isDemoRole(user.role)) {
-      sendError(res, 'forbidden', DEMO_READ_ONLY);
+    // A shared login is every visitor at once: this would sign all the others out.
+    if (!user.permissions.includes('account.self')) {
+      sendError(res, 'forbidden', READ_ONLY_ACCOUNT);
       return;
     }
     res.send({ signedOut: await auth.signOutOtherSessions(user.id, token) });
diff --git a/packages/server/src/features/compare/compare.routes.ts b/packages/server/src/features/compare/compare.routes.ts
index 0c890a240..c57375d94 100644
--- a/packages/server/src/features/compare/compare.routes.ts
+++ b/packages/server/src/features/compare/compare.routes.ts
@@ -5,7 +5,7 @@
  *
  * Declaration only: path, method, guards. No logic.
  */
-import { Router } from '../../platform/http/router';
+import { Router, reads } from '../../platform/http/router';
 import { requirePermissions } from '../../platform/authorization/rbac.guard';
 import { makeCompareController } from './compare.controller';
 import { makeCompareHandlers } from './compare.handler';
@@ -15,7 +15,7 @@ export function createCompareRoutes(deps: { compareService: CompareService }): R
   const router = Router();
   const handlers = makeCompareHandlers(makeCompareController(deps));
 
-  router.post('/compare', requirePermissions('schema.compare'), handlers.compare);
+  router.post('/compare', reads, requirePermissions('schema.compare'), handlers.compare);
 
   return router;
 }
diff --git a/packages/server/src/features/schema/schema.routes.ts b/packages/server/src/features/schema/schema.routes.ts
index 236b849c5..11f58b5ea 100644
--- a/packages/server/src/features/schema/schema.routes.ts
+++ b/packages/server/src/features/schema/schema.routes.ts
@@ -9,7 +9,7 @@ import { scopeOf } from '../../platform/http/scope';
 import type { ConnectionResolver } from '../../platform/connections/resolve';
 import type { FastifyReply } from 'fastify';
 import type { AppRequest } from '../../platform/http/types';
-import { Router } from '../../platform/http/router';
+import { Router, reads } from '../../platform/http/router';
 import { requirePermissions } from '../../platform/authorization/rbac.guard';
 import type { AuthedRequest } from '../../platform/http/types';
 import type { ConnectionRef } from '../../platform/connections/resolve';
@@ -26,7 +26,7 @@ export interface SchemaRouteDeps {
 
 export function createSchemaRoutes(deps: SchemaRouteDeps): Router {
   const router = Router();
-  router.post('/schema/list', requirePermissions('schema.browse'), async (req: AppRequest, res: FastifyReply) => {
+  router.post('/schema/list', reads, requirePermissions('schema.browse'), async (req: AppRequest, res: FastifyReply) => {
     try {
       const { dialect, option } = await deps.resolveRef(scopeOf(req as AuthedRequest), req.body as ConnectionRef);
       const provider = deps.connectionModule.getProvider(dialect);
@@ -40,7 +40,7 @@ export function createSchemaRoutes(deps: SchemaRouteDeps): Router {
     }
   });
 
-  router.post('/schema/load', requirePermissions('schema.browse'), async (req: AppRequest, res: FastifyReply) => {
+  router.post('/schema/load', reads, requirePermissions('schema.browse'), async (req: AppRequest, res: FastifyReply) => {
     const { scope, ...ref } = req.body as ConnectionRef & { scope: DbObjectType[] };
     try {
       const { dialect, option, schema } = await deps.resolveRef(scopeOf(req as AuthedRequest), ref);
@@ -59,6 +59,7 @@ export function createSchemaRoutes(deps: SchemaRouteDeps): Router {
   const tableInsightLimiter = rateLimit({ windowMs: 60 * 1000, max: 30 });
   router.post(
     '/schema/table-insight',
+    reads,
     tableInsightLimiter,
     // This powers Data Peek's Insight tab in the SQL Editor. Requiring
     // utility.access locked the whole tab out for the built-in viewer role,
diff --git a/packages/server/src/features/sql-editor/editor.routes.ts b/packages/server/src/features/sql-editor/editor.routes.ts
index 4624e6a5d..41eb8a26f 100644
--- a/packages/server/src/features/sql-editor/editor.routes.ts
+++ b/packages/server/src/features/sql-editor/editor.routes.ts
@@ -9,7 +9,7 @@ import { scopeOf } from '../../platform/http/scope';
 import type { ConnectionResolver } from '../../platform/connections/resolve';
 import type { FastifyReply } from 'fastify';
 import type { AppRequest } from '../../platform/http/types';
-import { Router } from '../../platform/http/router';
+import { Router, reads } from '../../platform/http/router';
 import { denyUnless } from '../../platform/authorization/rbac.guard';
 import { rateLimit } from '../../platform/guards/rate-limit';
 import { idempotency } from '../../platform/guards/idempotency';
@@ -80,7 +80,7 @@ export function createEditorRoutes(deps: EditorRouteDeps): Router {
   // made Express call it with (req, res, next); it returned a handler and never
   // called next(), so the request hung with no error and no response.
   const writeIdempotency = idempotency();
-  router.post('/sql/execute', sqlExecuteLimiter, writeIdempotency, async (req: AppRequest, res: FastifyReply) => {
+  router.post('/sql/execute', reads, sqlExecuteLimiter, writeIdempotency, async (req: AppRequest, res: FastifyReply) => {
     const { statements, maxRows, offset, params, datagridAction, seek, orderBy, stopOnError, transaction, ...ref } = req.body as ConnectionRef & {
       statements?: unknown;
       maxRows?: unknown;
@@ -229,7 +229,7 @@ export function createEditorRoutes(deps: EditorRouteDeps): Router {
   // The server already has it for Node cells, so the browser sends the source
   // here. It is compiled, never run: the same permission as opening the editor.
   const transpileLimiter = rateLimit({ windowMs: 60 * 1000, max: 120 });
-  router.post('/sql/code-cell/transpile', transpileLimiter, async (req: AppRequest, res: FastifyReply) => {
+  router.post('/sql/code-cell/transpile', reads, transpileLimiter, async (req: AppRequest, res: FastifyReply) => {
     if (denyUnless(req as AuthedRequest, res, 'editor.access')) return;
     const source = (req.body as { source?: unknown } | undefined)?.source;
     if (typeof source !== 'string' || !source.trim()) {
diff --git a/packages/server/src/features/users/user.routes.ts b/packages/server/src/features/users/user.routes.ts
index f8f7786cc..f73900609 100644
--- a/packages/server/src/features/users/user.routes.ts
+++ b/packages/server/src/features/users/user.routes.ts
@@ -1,6 +1,6 @@
 import type { FastifyReply } from 'fastify';
 import type { AppRequest } from '../../platform/http/types';
-import { Router } from '../../platform/http/router';
+import { Router, reads } from '../../platform/http/router';
 import { UserModule, UserPreferences } from './user.service';
 import type { AuthedRequest } from '../../platform/http/types';
 
@@ -12,7 +12,7 @@ export function createUserRoutes(user: UserModule): Router {
     res.send({ preferences: await user.getPreferences(req.userId!) });
   });
 
-  router.put('/preferences', async (req: AuthedRequest, res: FastifyReply) => {
+  router.put('/preferences', reads, async (req: AuthedRequest, res: FastifyReply) => {
     const { role, primaryDatabase, primaryGoal, theme, onboardingCompleted } = req.body as Partial<UserPreferences>;
     res.send({
       preferences: await user.updatePreferences(req.userId!, {
diff --git a/packages/server/src/features/workspaces/workspaces.routes.ts b/packages/server/src/features/workspaces/workspaces.routes.ts
index 82b58d0a1..7c60119af 100644
--- a/packages/server/src/features/workspaces/workspaces.routes.ts
+++ b/packages/server/src/features/workspaces/workspaces.routes.ts
@@ -7,7 +7,7 @@
  * (name, archive, members). Mounted behind `authGuard`.
  */
 import type { FastifyReply } from 'fastify';
-import { Router } from '../../platform/http/router';
+import { Router, reads } from '../../platform/http/router';
 import type { AuthedRequest } from '../../platform/http/types';
 import { sendError } from '../../platform/http/respond';
 import { ServiceError } from '../../platform/contracts/actor';
@@ -132,7 +132,7 @@ export function createWorkspaceRoutes(
   });
 
   /** Act in this workspace from now on (every tab and the CLI's next run follow). */
-  router.post('/:id/select', async (req: AuthedRequest, res: FastifyReply) => {
+  router.post('/:id/select', reads, async (req: AuthedRequest, res: FastifyReply) => {
     try {
       await directory.select(req.userId!, id(req));
       res.send({ ok: true });
diff --git a/packages/server/src/platform/authorization/demo-access.ts b/packages/server/src/platform/authorization/demo-access.ts
deleted file mode 100644
index 57da3dd7d..000000000
--- a/packages/server/src/platform/authorization/demo-access.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-/**
- * Fox Schema (foxschema)
- * Copyright 2024-2026 Huy Phan <huyplb@gmail.com>
- * SPDX-License-Identifier: Apache-2.0
- *
- * What a demo account may call.
- *
- * A published demo has one account whose login anyone can read, so its
- * permissions are not the whole story: a write any permission allowed would be
- * a write every visitor shares. So a demo account may read whatever its role
- * allows, and may write only through the routes below. Each of them reads,
- * whatever its verb: a SELECT goes over POST because it carries a body, not
- * because it changes anything.
- *
- * This is an allow-list on purpose. A route added later is closed to the demo
- * until someone decides it reads, rather than open until someone notices it
- * writes. `api/demo-account.test.ts` checks every entry against the real route
- * table, so a renamed route fails the build instead of quietly closing.
- */
-import { isDemoRole } from '@foxschema/shared';
-
-export interface DemoRoute {
-  method: 'POST' | 'PUT' | 'PATCH' | 'DELETE';
-  /** The route as registered, with `:params`. */
-  path: string;
-  /** Why it only reads, for whoever reviews the list next. */
-  why: string;
-}
-
-export const DEMO_ALLOWED_WRITES: readonly DemoRoute[] = [
-  {
-    method: 'POST',
-    path: '/api/sql/execute',
-    why: 'Runs SQL, and the demo role has no editor.dml, editor.ddl or editor.grant: only reads pass the gate.',
-  },
-  { method: 'POST', path: '/api/sql/code-cell/transpile', why: 'Compiles a TypeScript cell for the browser; never runs it.' },
-  { method: 'POST', path: '/api/schema/list', why: 'Lists schemas.' },
-  { method: 'POST', path: '/api/schema/load', why: 'Reads a schema.' },
-  { method: 'POST', path: '/api/schema/table-insight', why: 'Reads catalog statistics for one table.' },
-  { method: 'POST', path: '/api/schema/db-access', why: 'Reads database users and grants.' },
-  { method: 'POST', path: '/api/compare', why: 'Compares two schemas; deploying the result is schema.migrate.' },
-  {
-    method: 'PUT',
-    path: '/api/user/preferences',
-    why: 'Theme and onboarding state. Shared by every visitor, and harmless to share.',
-  },
-  {
-    method: 'POST',
-    path: '/api/workspaces/:id/select',
-    why: 'Switches the workspace the account acts in (one of its own): a preference, like the theme.',
-  },
-];
-
-/** The answer a demo account gets for anything else. */
-export const DEMO_READ_ONLY = 'This is a read-only demo: browsing, comparing and running queries work; saving and changing do not.';
-
-const READS = new Set(['GET', 'HEAD', 'OPTIONS']);
-
-/**
- * Whether `role` may call `method path`. Only a demo account is limited;
- * everyone else answers to their permissions alone.
- */
-export function demoMayCall(role: unknown, method: string, path: string): boolean {
-  if (!isDemoRole(role)) return true;
-  const verb = method.toUpperCase();
-  if (READS.has(verb)) return true;
-  return DEMO_ALLOWED_WRITES.some((r) => r.method === verb && r.path === path);
-}
diff --git a/packages/server/src/platform/authorization/rbac.service.test.ts b/packages/server/src/platform/authorization/rbac.service.test.ts
index b487f82dd..1b3c96778 100644
--- a/packages/server/src/platform/authorization/rbac.service.test.ts
+++ b/packages/server/src/platform/authorization/rbac.service.test.ts
@@ -277,6 +277,30 @@ describe('RbacModule', () => {
     }
   });
 
+  it('gives a role saved before read-only existed app.write and account.self, once, and never the Demo role', async () => {
+    const store = await getStore();
+    try {
+      await rbac.setRolePermissions(
+        'editor',
+        DEFAULT_ROLE_PERMISSIONS.editor.filter((p) => p !== 'app.write' && p !== 'account.self')
+      );
+      await rbac.setRolePermissions('demo', DEFAULT_ROLE_PERMISSIONS.demo);
+      await store.run('DELETE FROM app_settings WHERE "key" = ?', ['rbac.grant.app.write']);
+      await backfillDatagridRolePermissions(store);
+      const editor = new Set(await rbac.permissionsForRole('editor'));
+      expect(editor.has('app.write')).toBe(true);
+      expect(editor.has('account.self')).toBe(true);
+      expect(await rbac.permissionsForRole('demo')).not.toContain('app.write');
+      // An admin who then makes editors read-only keeps them that way.
+      await rbac.setRolePermissions('editor', [...editor].filter((p) => p !== 'app.write') as never);
+      await backfillDatagridRolePermissions(store);
+      expect(await rbac.permissionsForRole('editor')).not.toContain('app.write');
+    } finally {
+      await rbac.setRolePermissions('editor', DEFAULT_ROLE_PERMISSIONS.editor);
+      await rbac.setRolePermissions('demo', DEFAULT_ROLE_PERMISSIONS.demo);
+    }
+  });
+
   it('does not backfill Grant privileges onto editor', async () => {
     const store = await getStore();
     try {
diff --git a/packages/server/src/platform/authorization/rbac.service.ts b/packages/server/src/platform/authorization/rbac.service.ts
index 296660c50..080f2f2a9 100644
--- a/packages/server/src/platform/authorization/rbac.service.ts
+++ b/packages/server/src/platform/authorization/rbac.service.ts
@@ -275,6 +275,13 @@ const ONE_TIME_GRANTS: Array<{
     key: 'rbac.grant.workspace.manage',
     perms: ['workspace.members', 'workspace.settings'],
     when: (p) => p.has('schema.migrate'),
+  },  {
+    // Read-only as a permission: every role that could save and change things
+    // before keeps doing so. The Demo role's defaults lack both, so it is
+    // skipped and stays read-only; a role emptied on purpose stays empty.
+    key: 'rbac.grant.app.write',
+    perms: ['app.write', 'account.self'],
+    when: () => true,
   },
 ];
 
diff --git a/packages/server/src/platform/authorization/read-only.test.ts b/packages/server/src/platform/authorization/read-only.test.ts
new file mode 100644
index 000000000..902400672
--- /dev/null
+++ b/packages/server/src/platform/authorization/read-only.test.ts
@@ -0,0 +1,30 @@
+/**
+ * Fox Schema (foxschema)
+ * Copyright 2024-2026 Huy Phan <huyplb@gmail.com>
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Read-only is a permission, not a role name: any account without app.write
+ * reads, whatever role it has.
+ */
+import { describe, expect, it } from 'vitest';
+import { DEFAULT_ROLE_PERMISSIONS } from '@foxschema/shared';
+import { requestAllowed } from './read-only';
+
+describe('requestAllowed', () => {
+  it('lets an account without app.write read, and write only where the route declares it reads', () => {
+    const readOnly = DEFAULT_ROLE_PERMISSIONS.demo;
+    expect(readOnly).not.toContain('app.write');
+    expect(requestAllowed(readOnly, 'GET', false)).toBe(true);
+    expect(requestAllowed(readOnly, 'POST', true)).toBe(true);
+    expect(requestAllowed(readOnly, 'POST', false)).toBe(false);
+    expect(requestAllowed(readOnly, 'delete', false)).toBe(false);
+  });
+
+  it('lets every other built-in role write, and any role an admin strips of app.write read only', () => {
+    for (const role of ['viewer', 'editor', 'owner', 'admin'] as const) {
+      expect(requestAllowed(DEFAULT_ROLE_PERMISSIONS[role], 'PUT', false), role).toBe(true);
+    }
+    const stripped = new Set(DEFAULT_ROLE_PERMISSIONS.editor.filter((p) => p !== 'app.write'));
+    expect(requestAllowed(stripped, 'POST', false)).toBe(false);
+  });
+});
diff --git a/packages/server/src/platform/authorization/read-only.ts b/packages/server/src/platform/authorization/read-only.ts
new file mode 100644
index 000000000..552303479
--- /dev/null
+++ b/packages/server/src/platform/authorization/read-only.ts
@@ -0,0 +1,33 @@
+/**
+ * Fox Schema (foxschema)
+ * Copyright 2024-2026 Huy Phan <huyplb@gmail.com>
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Which requests an account without `app.write` may make: every GET, and the
+ * writes whose route declares that it only reads (`reads` in router.ts, beside
+ * the handler: a SELECT goes over POST because it carries a body, not because
+ * it changes anything). Everything else refuses it before the handler runs.
+ *
+ * The Demo role is the role without `app.write`: a published demo's shared
+ * login can browse, compare and query, and save nothing every visitor would
+ * share. A new route is closed to such an account until it is declared to read,
+ * rather than open until someone notices it writes; `api/demo-account.test.ts`
+ * calls every guarded write as one and keeps the list of `reads` routes reviewed.
+ */
+import type { Permission } from '@foxschema/shared';
+
+/** The answer a read-only account gets for anything it may not do. */
+export const READ_ONLY_ACCOUNT =
+  'This account is read-only: browsing, comparing and running queries work; saving and changing do not.';
+
+const READS = new Set(['GET', 'HEAD', 'OPTIONS']);
+
+/** Whether an account with `permissions` may call a `method` route that does (or does not) declare `reads`. */
+export function requestAllowed(
+  permissions: readonly Permission[] | ReadonlySet<Permission>,
+  method: string,
+  routeReads: boolean
+): boolean {
+  if (READS.has(method.toUpperCase()) || routeReads) return true;
+  return 'has' in permissions ? permissions.has('app.write') : permissions.includes('app.write');
+}
diff --git a/packages/server/src/platform/http/fastify-bind.ts b/packages/server/src/platform/http/fastify-bind.ts
index c28552671..81d4e9ec4 100644
--- a/packages/server/src/platform/http/fastify-bind.ts
+++ b/packages/server/src/platform/http/fastify-bind.ts
@@ -47,6 +47,8 @@ export function bindRoutes(app: FastifyInstance, routes: RouteDefinition[]): voi
     app.route({
       method: route.method,
       url: route.path,
+      // Read by the session guard (`req.routeOptions.config.reads`).
+      config: { reads: route.reads === true },
       handler: async (request, reply) => {
         const proceed = await runChain(route.middlewares, request as AppRequest, reply);
         if (!proceed) return reply;
diff --git a/packages/server/src/platform/http/router.ts b/packages/server/src/platform/http/router.ts
index ce91fe6ec..2694ab7e9 100644
--- a/packages/server/src/platform/http/router.ts
+++ b/packages/server/src/platform/http/router.ts
@@ -15,6 +15,19 @@
  */
 import type { HttpMethod, Middleware, RouteHandler } from './types';
 
+/**
+ * Declares that a route only reads, whatever its verb: `router.post('/sql/execute',
+ * reads, handler)`. A POST that carries a SELECT in its body still reads. An
+ * account without `app.write` (the Demo role) may call a route only when it is
+ * a GET or declared this way; every other write refuses it before the handler.
+ *
+ * A route says so beside its own handler, so a new route is closed to a
+ * read-only account until someone decides it reads.
+ */
+export const reads = Object.freeze({ reads: true as const });
+type ReadsMarker = typeof reads;
+type ChainItem = Middleware | RouteHandler | ReadsMarker;
+
 export interface RouteDefinition {
   method: HttpMethod;
   /** As declared, relative to wherever this router is mounted. */
@@ -22,6 +35,8 @@ export interface RouteDefinition {
   /** Guards for this route only, in declaration order. */
   middlewares: Middleware[];
   handler: RouteHandler;
+  /** Declared with `reads`: only reads, whatever its verb. */
+  reads?: true;
 }
 
 interface MountedRouter {
@@ -34,25 +49,27 @@ export class RouteCollector {
   private readonly routes: RouteDefinition[] = [];
   private readonly mounted: MountedRouter[] = [];
 
-  private add(method: HttpMethod, path: string, chain: (Middleware | RouteHandler)[]): void {
-    const handler = chain[chain.length - 1] as RouteHandler;
-    const middlewares = chain.slice(0, -1) as Middleware[];
-    this.routes.push({ method, path, middlewares, handler });
+  private add(method: HttpMethod, path: string, chain: ChainItem[]): void {
+    const isRead = chain.includes(reads);
+    const rest = chain.filter((c) => c !== reads) as (Middleware | RouteHandler)[];
+    const handler = rest[rest.length - 1] as RouteHandler;
+    const middlewares = rest.slice(0, -1) as Middleware[];
+    this.routes.push({ method, path, middlewares, handler, ...(isRead ? { reads: true as const } : {}) });
   }
 
-  get(path: string, ...chain: (Middleware | RouteHandler)[]): void {
+  get(path: string, ...chain: ChainItem[]): void {
     this.add('GET', path, chain);
   }
-  post(path: string, ...chain: (Middleware | RouteHandler)[]): void {
+  post(path: string, ...chain: ChainItem[]): void {
     this.add('POST', path, chain);
   }
-  put(path: string, ...chain: (Middleware | RouteHandler)[]): void {
+  put(path: string, ...chain: ChainItem[]): void {
     this.add('PUT', path, chain);
   }
-  delete(path: string, ...chain: (Middleware | RouteHandler)[]): void {
+  delete(path: string, ...chain: ChainItem[]): void {
     this.add('DELETE', path, chain);
   }
-  patch(path: string, ...chain: (Middleware | RouteHandler)[]): void {
+  patch(path: string, ...chain: ChainItem[]): void {
     this.add('PATCH', path, chain);
   }
 
@@ -98,6 +115,7 @@ export class RouteCollector {
         path: joinPath(prefix, r.path),
         middlewares: [...base, ...r.middlewares],
         handler: r.handler,
+        ...(r.reads ? { reads: r.reads } : {}),
       });
     }
     for (const m of this.mounted) {
diff --git a/packages/server/src/platform/identity/auth.guard.ts b/packages/server/src/platform/identity/auth.guard.ts
index b0cf41045..56783004d 100644
--- a/packages/server/src/platform/identity/auth.guard.ts
+++ b/packages/server/src/platform/identity/auth.guard.ts
@@ -14,7 +14,7 @@ import type { Permission, WorkspaceRole } from '@foxschema/shared';
 import { type AuthModule, SESSION_COOKIE, SESSION_MAX_AGE_MS, type AuthUser } from './auth.service';
 import { sendError } from '../http/respond';
 import { ServiceError } from '../contracts/actor';
-import { DEMO_READ_ONLY, demoMayCall } from '../authorization/demo-access';
+import { READ_ONLY_ACCOUNT, requestAllowed } from '../authorization/read-only';
 
 /** Put the resolved session user's identity + grants on the request. */
 export function attachAuthUser(
@@ -85,11 +85,12 @@ export function authGuard(auth: AuthModule) {
         sendError(res, 'unauthenticated', 'Authentication required');
         return;
       }
-      // A demo account reads; it writes only through routes that read (demo-access.ts).
-      // Matched on the registered route, `:params` and all, never the raw URL.
-      // Before the workspace reads below: a refused write needs none of them.
-      if (!demoMayCall(session.user.role, req.method, req.routeOptions?.url ?? '')) {
-        sendError(res, 'forbidden', DEMO_READ_ONLY);
+      // An account without app.write reads: a write it may make declares it on
+      // its own route (`reads`, read-only.ts). Before the workspace reads
+      // below: a refused write needs none of them.
+      const routeReads = (req.routeOptions?.config as { reads?: boolean } | undefined)?.reads === true;
+      if (!requestAllowed(session.user.permissions, req.method, routeReads)) {
+        sendError(res, 'forbidden', READ_ONLY_ACCOUNT);
         return;
       }
       if (session.launch && (await auth.registrationState()).required) {
diff --git a/packages/server/src/platform/identity/auth.service.ts b/packages/server/src/platform/identity/auth.service.ts
index b27531f35..d8e445a3b 100644
--- a/packages/server/src/platform/identity/auth.service.ts
+++ b/packages/server/src/platform/identity/auth.service.ts
@@ -275,10 +275,11 @@ export class AuthModule {
       [normalized]
     );
     if (!row || (row.active !== null && row.active !== undefined && Number(row.active) === 0)) return null;
-    // A demo login is shared and its password is public: a visitor asking for
-    // a reset would change it for everyone. Only an admin resets it. Answered
-    // exactly like an unknown email, so the reply says nothing either way.
-    if (isDemoRole(row.app_role)) return null;
+    // A shared login (no account.self, the Demo role) has a public password: a
+    // visitor asking for a reset would change it for everyone. Only an admin
+    // resets it. Answered exactly like an unknown email, so the reply says
+    // nothing either way.
+    if (!(await this.rbac.permissionsForRole(toAppRole(row.app_role))).includes('account.self')) return null;
     return this.issueCode(row.id, 'reset');
   }
 
diff --git a/packages/shared/src/permissions.ts b/packages/shared/src/permissions.ts
index 915e11f32..2fe2196a8 100644
--- a/packages/shared/src/permissions.ts
+++ b/packages/shared/src/permissions.ts
@@ -93,6 +93,9 @@ export const PERMISSIONS = [
   'admin.users',
   'admin.roles',
   'admin.drivers',
+  // Account
+  'app.write',
+  'account.self',
 ] as const;
 
 export type Permission = (typeof PERMISSIONS)[number];
@@ -156,6 +159,8 @@ export const PERMISSION_META: PermissionMeta[] = [
   { id: 'workspace.create', group: 'Workspace', label: 'Create workspaces', description: 'Create workspaces besides your own. Install-wide: comes from the account role, not a workspace role.' },
   { id: 'admin.users', group: 'Admin', label: 'Manage users', description: 'List FoxSchema logins, assign app roles, and activate or deactivate accounts. Not the same as database users on a connected server.' },
   { id: 'admin.roles', group: 'Admin', label: 'Configure roles', description: 'Edit which FoxSchema permissions each app role receives, including Grant privileges for database GRANT/REVOKE.' },
+  { id: 'app.write', group: 'Account', label: 'Save and change', description: 'Save connections, secrets, scripts and settings, and run anything that writes. Without it an account only reads: it browses, compares and runs queries, and every other route refuses it. The Demo role is the role without it. Install-wide: comes from the account role, not a workspace role.' },
+  { id: 'account.self', group: 'Account', label: 'Manage own account', description: 'Change its own profile and password, ask for a reset or a verification email, and sign its other sessions out. A shared login (the Demo role) has it withheld, so no visitor changes the account for everyone. Install-wide: comes from the account role.' },
   { id: 'admin.drivers', group: 'Admin', label: 'Install drivers', description: 'Install a database driver package on the server (npm install, and a native build for Db2). It downloads and runs code on the machine Fox Schema runs on, for every workspace. Install-wide: comes from the account role, not a workspace role.' },
 ];
 
@@ -163,11 +168,11 @@ const ALL = [...PERMISSIONS];
 
 /**
  * A viewer's reading, without workflows or Git: browse and compare schemas,
- * read history, inspect access, run SELECTs. Every permission that writes is
- * absent. Whatever an admin adds here, the server lets a demo account reach
- * only the routes that read (`DEMO_ALLOWED_WRITES` on the server): saving a
- * connection, a secret, a workspace or a profile stays closed. What SQL it may
- * run follows these permissions, so adding `editor.dml` makes a sandbox.
+ * read history, inspect access, run SELECTs. It lacks `app.write`, so the
+ * server refuses every route that is not declared to read (saving a
+ * connection, a secret, a workspace), and `account.self`, so no visitor
+ * changes the shared login. What SQL it may run follows these permissions, so
+ * adding `editor.dml` makes a sandbox.
  */
 const DEMO: Permission[] = [
   'schema.browse',
@@ -185,8 +190,11 @@ const DEMO: Permission[] = [
   'access.report',
 ];
 
-/** The demo's reading, plus workflows and Git to look at. Each role above builds on the one below. */
-const VIEWER: Permission[] = [...DEMO, 'workflow.access', 'git.view'];
+/**
+ * The demo's reading, plus workflows and Git to look at, and the right to save
+ * its own work and run its own account. Each role above builds on the one below.
+ */
+const VIEWER: Permission[] = [...DEMO, 'workflow.access', 'git.view', 'app.write', 'account.self'];
 
 const EDITOR: Permission[] = [
   ...VIEWER,
@@ -334,6 +342,8 @@ export const INSTALL_PERMISSIONS: ReadonlySet<Permission> = new Set<Permission>(
   'admin.roles',
   'admin.drivers',
   'workspace.create',
+  'app.write',
+  'account.self',
 ]);
 
 /**