diff --git a/‎content/docs/ui/react-pages.mdx‎
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diff --git a/‎examples/app-showcase/src/ui/pages/crm-workbench.page.ts‎
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diff --git a/‎examples/app-showcase/src/ui/pages/renewals-pipeline.page.ts‎
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diff --git a/‎examples/app-showcase/test/react-page-adapter-query-contract.test.ts‎
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diff --git a/‎packages/spec/scripts/build-react-blocks-contract.ts‎
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diff --git a/‎skills/objectstack-ui/references/react-blocks.md‎
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diff --git a/‎skills/objectstack-ui/rules/pages.md‎
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@@ -86,6 +86,7 @@ builds for it:
 | The data blocks | One wrapper component per **public, non-container** registered block. |
 | `Block` | Escape hatch — render any registered component by type. |
 | `useAdapter` | The live data source: `find` / `findOne` / `create` / `update`. |
+| `useDataInvalidation` | The data-invalidation bus reader: `useDataInvalidation('object')` returns a number that moves when a write to that object is reported on the bus. Name it in the dependencies of the effect that reads through `useAdapter` — see [Live data](#live-data). |
 | `data`, `variables`, `page` | The page's data, its `variables` map, and its own schema. |
 
 **On the `react` tier only.** A `kind:'html'` page's source is parsed and never evaluated,
@@ -175,6 +176,7 @@ options are OData-shaped — `$filter`, `$top`, `$skip`, `$select`, `$orderby`,
 ```jsx
 function Page() {
   const adapter = useAdapter();
+  const changed = useDataInvalidation('showcase_invoice');
   const [rows, setRows] = React.useState([]);
 
   React.useEffect(() => {
@@ -187,12 +189,17 @@ function Page() {
       if (alive) setRows(result.data);
     })();
     return () => { alive = false; };
-  }, [adapter]);
+  }, [adapter, changed]);
 
   return <ul>{rows.map((r) => <li key={r.id}>{r.name}</li>)}</ul>;
 }
 ```
 
+`changed` is in the dependency array so the page's own read follows the data: when a page
+action elsewhere writes `showcase_invoice`, the write is reported on the data-invalidation
+bus (the same bus `<ListView>` refreshes from), the nonce moves, and the effect runs again
+in place — the page is not remounted, so its own state survives.
+
 `find()` always resolves to the same envelope — a `QueryResult` carrying the rows
 under `data`. A backend that answers with a bare array is folded into that envelope
 before your code sees it, so `result.data` is the only row shape a page is ever handed:
 
@@ -23,6 +23,9 @@ export const CrmWorkbenchPage = definePage({
   source: `
 function Page() {
   const adapter = useAdapter();
+  // The data-invalidation bus nonce for showcase_project: a page action elsewhere
+  // that writes a project moves it, and the KPI effect below re-reads in place.
+  const projectChanged = useDataInvalidation('showcase_project');
   const [selected, setSelected] = React.useState(null);
   const [mode, setMode] = React.useState('edit');
   const [reloadKey, setReloadKey] = React.useState(0);
@@ -56,7 +59,7 @@ function Page() {
       setStats({ total, active: rows.filter((r) => r.status === 'active').length });
     } catch (e) { console.warn('[CRM Workbench] failed to refresh stats', e); }
   }, [adapter]);
-  React.useEffect(() => { refreshStats(); }, [refreshStats, reloadKey]);
+  React.useEffect(() => { refreshStats(); }, [refreshStats, reloadKey, projectChanged]);
 
   const openNew = () => { setSelected(null); setMode('create'); };
   const onRowClick = (rec) => { setSelected(rec); setMode('edit'); };
 
@@ -54,14 +54,19 @@ export const RenewalsPipelinePage = definePage({
   source: `
 function Page() {
   const adapter = useAdapter();
+  // The data-invalidation bus nonces for the two objects the rollup reads: a page
+  // action elsewhere that writes a project or an invoice moves one, and the effect
+  // below re-reads in place.
+  const projectChanged = useDataInvalidation('showcase_project');
+  const invoiceChanged = useDataInvalidation('showcase_invoice');
   const [sel, setSel] = React.useState(null);
   const [editing, setEditing] = React.useState(false);
   const [reload, setReload] = React.useState(0);
   const [stage, setStage] = React.useState('active');
   const [related, setRelated] = React.useState({ projects: 0, invoices: 0, openInvoices: 0, capped: false });
 
   // Hand-rolled rollup: the imperative counterpart of the framework blocks
-  // below. You own the queries, loading, and refresh (reload bumps re-run it) --
+  // below. You own the queries, loading, and refresh (reload bumps and bus writes re-run it) --
   // and, because you own them, you own the two adapter contracts the blocks hide:
   //
   //  1. QUERY OPTIONS ARE $-PREFIXED. QueryParams declares $select, $filter,
@@ -99,7 +104,7 @@ function Page() {
       });
     })();
     return () => { alive = false; };
-  }, [adapter, sel, reload]);
+  }, [adapter, sel, reload, projectChanged, invoiceChanged]);
 
   const Stat = ({ label, value, accent }) => (
     <div style={{ background: 'hsl(var(--muted))', border: '1px solid hsl(var(--border))', borderRadius: 'var(--radius)', padding: 12 }}>
 
@@ -116,11 +116,14 @@ async function runRollup(
   let settle!: (v: Rollup) => void;
   const done = new Promise<Rollup>((res) => { settle = res; });
   const React = { useEffect: (cb: () => unknown) => { cb(); } };
+  // The effect's dependency list names the two data-invalidation bus nonces the page
+  // reads through the injected `useDataInvalidation`; here they are plain numbers that
+  // never move, so the lifted call evaluates and the body runs exactly once.
   // eslint-disable-next-line @typescript-eslint/no-implied-eval, no-new-func
-  const run = new Function('React', 'adapter', 'sel', 'reload', 'setRelated', effectSource) as (
-    React: unknown, adapter: unknown, sel: unknown, reload: unknown, setRelated: (v: Rollup) => void,
+  const run = new Function('React', 'adapter', 'sel', 'reload', 'projectChanged', 'invoiceChanged', 'setRelated', effectSource) as (
+    React: unknown, adapter: unknown, sel: unknown, reload: unknown, projectChanged: unknown, invoiceChanged: unknown, setRelated: (v: Rollup) => void,
   ) => void;
-  run(React, adapter, sel, 0, settle);
+  run(React, adapter, sel, 0, 0, 0, settle);
   return done;
 }
 
 
@@ -136,7 +136,7 @@ const blocks = REACT_BLOCKS.map((b) => {
 // states its provenance in the frontmatter `description` it emits instead.
 const contract = {
   adr: 'ADR-0081',
-  note: "Props each component accepts in kind:'react' page source. Reference blocks by their PascalCase tag. kind: data=declarative config (from the spec schema) · binding=connects to data · controlled=React state · callback=React function. These blocks are for DATA. Live data: const adapter = useAdapter(); adapter.find/findOne/create/update. STYLING (ADR-0065) — a page's source is runtime metadata, so the console's build-time Tailwind NEVER scans it: utility classNAMES silently produce no CSS. Do NOT use Tailwind className in page source. (a) Layout/chrome: inline style={} with hsl(var(--token)) theme colors — e.g. color:'hsl(var(--foreground))', background:'hsl(var(--card))', border:'1px solid hsl(var(--border))', and px/flex for layout. (b) Overlays: render <ObjectForm formType='drawer'|'modal' open onOpenChange> (a pre-styled Sheet/Dialog) — never hand-roll a fixed inset-0 backdrop.",
+  note: "Props each component accepts in kind:'react' page source. Reference blocks by their PascalCase tag. kind: data=declarative config (from the spec schema) · binding=connects to data · controlled=React state · callback=React function. These blocks are for DATA. Live data: const adapter = useAdapter(); adapter.find/findOne/create/update; const changed = useDataInvalidation('obj') is the data-invalidation bus nonce (a number that moves when a write to obj is reported) — name it in the deps of the effect that reads through useAdapter, so that read re-runs in place with no remount. STYLING (ADR-0065) — a page's source is runtime metadata, so the console's build-time Tailwind NEVER scans it: utility classNAMES silently produce no CSS. Do NOT use Tailwind className in page source. (a) Layout/chrome: inline style={} with hsl(var(--token)) theme colors — e.g. color:'hsl(var(--foreground))', background:'hsl(var(--card))', border:'1px solid hsl(var(--border))', and px/flex for layout. (b) Overlays: render <ObjectForm formType='drawer'|'modal' open onOpenChange> (a pre-styled Sheet/Dialog) — never hand-roll a fixed inset-0 backdrop.",
 };
 
 // markdown
@@ -169,7 +169,7 @@ for (const b of blocks) {
 }
 L.push('## Injected scope (closure variables, reference directly — not props)');
 L.push('');
-L.push('`React` · `useAdapter` · `data` · `variables` · `page`. Kanban/calendar/gantt/timeline/map of an object = `<ListView navigation={…} />` with the matching visualization, or `<Block type="object-kanban" …/>`.');
+L.push('`React` · `useAdapter` · `useDataInvalidation` · `data` · `variables` · `page`. Kanban/calendar/gantt/timeline/map of an object = `<ListView navigation={…} />` with the matching visualization, or `<Block type="object-kanban" …/>`.');
 L.push('');
 emit(OUT_MD, L.join('\n'));
 
 
@@ -7,7 +7,7 @@ description: Props each injected component accepts in kind:'react' page source (
 
 # React-tier component contract (ADR-0081)
 
-Props each component accepts in kind:'react' page source. Reference blocks by their PascalCase tag. kind: data=declarative config (from the spec schema) · binding=connects to data · controlled=React state · callback=React function. These blocks are for DATA. Live data: const adapter = useAdapter(); adapter.find/findOne/create/update. STYLING (ADR-0065) — a page's source is runtime metadata, so the console's build-time Tailwind NEVER scans it: utility classNAMES silently produce no CSS. Do NOT use Tailwind className in page source. (a) Layout/chrome: inline style={} with hsl(var(--token)) theme colors — e.g. color:'hsl(var(--foreground))', background:'hsl(var(--card))', border:'1px solid hsl(var(--border))', and px/flex for layout. (b) Overlays: render <ObjectForm formType='drawer'|'modal' open onOpenChange> (a pre-styled Sheet/Dialog) — never hand-roll a fixed inset-0 backdrop.
+Props each component accepts in kind:'react' page source. Reference blocks by their PascalCase tag. kind: data=declarative config (from the spec schema) · binding=connects to data · controlled=React state · callback=React function. These blocks are for DATA. Live data: const adapter = useAdapter(); adapter.find/findOne/create/update; const changed = useDataInvalidation('obj') is the data-invalidation bus nonce (a number that moves when a write to obj is reported) — name it in the deps of the effect that reads through useAdapter, so that read re-runs in place with no remount. STYLING (ADR-0065) — a page's source is runtime metadata, so the console's build-time Tailwind NEVER scans it: utility classNAMES silently produce no CSS. Do NOT use Tailwind className in page source. (a) Layout/chrome: inline style={} with hsl(var(--token)) theme colors — e.g. color:'hsl(var(--foreground))', background:'hsl(var(--card))', border:'1px solid hsl(var(--border))', and px/flex for layout. (b) Overlays: render <ObjectForm formType='drawer'|'modal' open onOpenChange> (a pre-styled Sheet/Dialog) — never hand-roll a fixed inset-0 backdrop.
 
 **kind**: `data` = declarative config (from the spec schema — the authoritative source) · `binding` = connects the block to data · `controlled` = drive from React state · `callback` = a React function the block calls.
 
@@ -112,4 +112,4 @@ Escape hatch — render any registered component by type. <Block type="object-ka
 
 ## Injected scope (closure variables, reference directly — not props)
 
-`React` · `useAdapter` · `data` · `variables` · `page`. Kanban/calendar/gantt/timeline/map of an object = `<ListView navigation={…} />` with the matching visualization, or `<Block type="object-kanban" …/>`.
+`React` · `useAdapter` · `useDataInvalidation` · `data` · `variables` · `page`. Kanban/calendar/gantt/timeline/map of an object = `<ListView navigation={…} />` with the matching visualization, or `<Block type="object-kanban" …/>`.
@@ -169,6 +169,9 @@ The source is real React executed at render by the runtime. The injected scope a
 
 - `React` — hooks (`React.useState`, `React.useEffect`, …)
 - `useAdapter()` — live data: `adapter.find('obj', {…})` / `.findOne` / `.create` / `.update`
+- `useDataInvalidation('obj')` — the data-invalidation bus nonce (a number): name it in the
+  deps of the effect that reads through `useAdapter`, so a page action elsewhere that writes
+  `obj` re-runs that read in place, with no remount
 - the public **data blocks as PascalCase components** — `<ObjectForm>`, `<ListView>`,
   `<ObjectMetric>`, `<ObjectChart>`, `<ObjectKanban>`, … The scope is built at
   runtime from the public block registry (every non-container public block gets a
@@ -200,10 +203,7 @@ why it silently does nothing.
 > It is the authoritative answer to "what props does `<ObjectForm>`/`<ListView>`/…
 > take?" — author against it, not from memory. The `data` props are sourced from the platform's spec schemas (FormView,
 > ListView, Chart, …) — the same protocol the server validates;
-> `binding`/`controlled`/`callback` are the React overlay. The contract covers
-> the **curated core set**; runtime-injected blocks outside it (`<ObjectMetric>`,
-> `<ObjectKanban>`, …) read their props from the block registry at render time —
-> except the `record:*` family, which is rejected on this surface (above).
+> `binding`/`controlled`/`callback` are the React overlay.
 > (Maintainers: regenerate with `pnpm --filter @objectstack/spec gen:react-blocks`.)
 
 Master/detail (click a row → edit it → save refreshes the list):