@@ -0,0 +1,47 @@
+---
+"@objectstack/spec": patch
+"@objectstack/plugin-approvals": patch
+---
+
+fix(approvals): record an admin override of a staffed approver slate AS an override (#4466)
+
+An admin who is not in a request's `pending_approvers` may still act on it — the
+`#3424` privileged-override path exists so a request routed to an unstaffed
+position, or to approvers who have all left, is not undecidable forever. The
+override is defensible; what was not is what the audit trail recorded.
+
+`sys_approval_action` had no override column at all. So an admin overriding a
+properly-staffed slate wrote a row **byte-for-byte identical** to the designated
+approver approving normally: a reader of the timeline saw `approve` by the admin
+and could not tell whether the admin *was* an approver or *overrode* the ones who
+were, and the bypassed approver's later `409 INVALID_STATE` was the only trace —
+existing only if they happened to try. The platform knows at decision time (it
+took the `isOverrideActor` branch to admit the call at all), so this was dropped
+information, not unavailable information. The whole point of an approval record
+is to answer "who authorized this, and were they entitled to?".
+
+`sys_approval_action` now carries **`via_override`** (boolean, optional), set on
+exactly the actions admitted by that branch — `decideNode`'s approve/reject and
+`reassign`'s admin rescue. It is surfaced on `ApprovalActionRow.via_override`
+(`@objectstack/spec/contracts`), returned by `listActions`, and added to the
+object's `highlightFields` and two grid list views so a timeline can say
+"overrode the approver slate" instead of rendering it as an ordinary approval.
+
+Three distinctions the column keeps apart deliberately:
+
+- **`true`** — the actor held no slot in the slate and was admitted only by the
+  override branch.
+- **`false`** — checked, and it was not an override. An admin who *is* a
+  designated approver is approving normally and records `false`: the marker is
+  about which branch admitted the call, not about whether the actor holds admin
+  rights.
+- **absent** — a row written before this column existed. "Not recorded" is not
+  the same claim as "not an override", so `rowFromAction` maps `null` to
+  `undefined` rather than to `false`.
+
+Additive and nullable, so this needs no data migration: existing rows keep
+working and simply read as unrecorded. Levelled `patch` rather than `minor`
+because nothing an author writes changes — but note it *is* an observable
+behaviour change on a read surface: `listActions` responses and the
+`sys_approval_action` grid views now carry a field consumers did not see before,
+and `sys_approval_action` gains a column on next schema sync.
@@ -0,0 +1,49 @@
+---
+"@objectstack/spec": patch
+"@objectstack/service-automation": patch
+"@objectstack/runtime": patch
+---
+
+fix(automation): `resume` enforces the suspended screen's declared field contract (#4477)
+
+A `screen` node's `config.fields` is a complete input contract — the author
+declares the keys, their `required`-ness, and (via `visibleWhen`) when a field
+is even asked for. The RENDER half honoured all of it: the paused result and
+`GET …/runs/:runId/screen` carry `required` and `visibleWhen` intact. There was
+no VALIDATION half — `POST …/runs/:runId/resume` folded whatever bag it was
+handed straight into the flow variables, so a caller that skipped the dialog and
+posted here directly was unconstrained by every `required` the author wrote.
+Missing required fields, and keys the screen never declared, all completed the
+run with `success: true`.
+
+Screen flows are the one place where the declared field contract is the ONLY
+contract — no object schema sits behind a screen node to catch a bad bag
+downstream. The platform already enforces the analogous contract everywhere else
+this seam appears: action params (ADR-0104 D2), record writes (ADR-0113),
+approval `decisionOutputs` (#3447). This is that rule for screen resume, built in
+the same shape.
+
+`resume` now refuses a non-conforming submission with the new
+`AutomationResult.code` `'INVALID_SCREEN_INPUT'` (a transport maps it to **400**,
+as the automation domain route now does) and an `Invalid screen input: …` message
+that names each violation and lists the declared field names. The refusal happens
+BEFORE the suspension is consumed, so the pause stays live and the legitimate
+submission still lands.
+
+`visibleWhen` is evaluated against the SUBMITTED values first (layered over the
+run's variable snapshot), so a hidden field's `required` never fires — enforcing
+it would dead-end the run at a field the user was never shown, which is #3528
+reproduced server-side. A predicate that cannot be evaluated is logged and
+treated as hidden rather than visible: the client decides what the user saw, and
+a broken predicate is not evidence a field was on screen.
+
+Scope, deliberately narrow — three shapes keep the historical pass-through:
+
+- an **object-form** screen (`kind: 'object-form'`), whose `fields` is empty by
+  construction because the client renders the object's own form and the write
+  path enforces that object's `required` fields itself;
+- a **message-only** screen (`waitForInput: true`, no fields), which declares no
+  keys and so constrains none — the same pass-through `enforceActionParams`
+  gives a param-less action;
+- `signal.output`, the node-OUTPUT namespace, which belongs to the approval-style
+  resume envelope rather than to the screen's collected-values channel.
@@ -0,0 +1,210 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * An admin override of a STAFFED approver slate is recorded as an override (#4466).
+ *
+ * The reproduction is the issue's: `showcase_dynamic_approval` stage 2 resolved
+ * its `expression` approvers correctly to exactly one designated user, and the
+ * admin — who was not in that slate — approved it anyway through the #3424
+ * privileged path. The designated approver then got `409 INVALID_STATE`.
+ *
+ * The override itself is defensible; what was not is the audit trail. Before
+ * this, `sys_approval_action` had no override column at all, so an admin
+ * overriding a properly-staffed slate wrote a row byte-for-byte identical to the
+ * designated approver approving normally. A reader of the timeline saw `approve`
+ * by the admin and could not tell which had happened, and the bypassed
+ * approver's 409 was the only trace — existing only if they happened to try.
+ *
+ * The platform KNOWS at decision time: it took the `isOverrideActor` branch to
+ * admit the call. This was dropped information, not unavailable information.
+ */
+
+import { describe, it, expect, beforeEach } from 'vitest';
+import { ApprovalService } from './approval-service.js';
+
+interface FakeRow { [k: string]: any }
+
+/** The same minimal engine shape `approval-service.test.ts` uses. */
+function makeFakeEngine() {
+  const tables: Record<string, FakeRow[]> = {};
+  const ensure = (n: string) => (tables[n] ??= []);
+  function matches(row: FakeRow, filter: any): boolean {
+    if (!filter || typeof filter !== 'object') return true;
+    for (const [k, v] of Object.entries(filter)) {
+      if (k === '$or') {
+        if (!(v as any[]).some(sub => matches(row, sub))) return false;
+        continue;
+      }
+      const rv = row[k];
+      if (v != null && typeof v === 'object' && '$in' in (v as any)) {
+        if (!(v as any).$in.includes(rv)) return false;
+        continue;
+      }
+      if (rv !== v) return false;
+    }
+    return true;
+  }
+  return {
+    _tables: tables,
+    async find(object: string, options?: any) {
+      const rows = ensure(object).filter(r => matches(r, options?.filter ?? options?.where));
+      if (options?.orderBy?.[0]) {
+        const { field, order } = options.orderBy[0];
+        rows.sort((a, b) => {
+          const av = a[field]; const bv = b[field];
+          if (av === bv) return 0;
+          const cmp = av > bv ? 1 : -1;
+          return order === 'desc' ? -cmp : cmp;
+        });
+      }
+      const start = options?.offset ?? 0;
+      return rows.slice(start, start + (options?.limit ?? 1000));
+    },
+    async insert(object: string, data: any) { ensure(object).push({ ...data }); return { ...data }; },
+    async update(object: string, idOrData: any, _opts?: any) {
+      const data = typeof idOrData === 'object' ? idOrData : _opts;
+      const id = typeof idOrData === 'object' ? idOrData.id : idOrData;
+      const table = ensure(object);
+      const i = table.findIndex(r => r.id === id);
+      if (i >= 0) table[i] = { ...table[i], ...data };
+      return table[i];
+    },
+    async delete(object: string, options?: any) {
+      const table = ensure(object);
+      const i = table.findIndex(r => r.id === (options?.where?.id ?? options?.id));
+      if (i >= 0) table.splice(i, 1);
+      return {};
+    },
+    registerHook() {}, unregisterHooksByPackage() { return 0; }, async fire() {},
+  };
+}
+
+const SYS = { isSystem: true, positions: [], permissions: [] } as any;
+const SUBMITTER = { userId: 'u1', tenantId: 't1', positions: [], permissions: [] } as any;
+/** The designated approver the slate actually names. */
+const DESIGNATED = { userId: 'u9', tenantId: 't1', positions: [], permissions: [] } as any;
+/** An admin who is NOT in the slate — the issue's actor. */
+const ADMIN = { userId: 'root', tenantId: 't1', positions: [], permissions: ['admin_full_access'] } as any;
+/** An admin who IS a designated approver — approving normally, not overriding. */
+const ADMIN_ON_SLATE = { userId: 'u9', tenantId: 't1', positions: [], permissions: ['admin_full_access'] } as any;
+
+describe('approval override audit marker (#4466)', () => {
+  let engine: ReturnType<typeof makeFakeEngine>;
+  let svc: ApprovalService;
+  let n = 0;
+  const baseTime = new Date('2026-01-15T10:00:00Z').getTime();
+
+  beforeEach(() => {
+    engine = makeFakeEngine();
+    n = 0;
+    svc = new ApprovalService({
+      engine: engine as any,
+      clock: { now: () => new Date(baseTime + (n++) * 1000) },
+    });
+  });
+
+  /** A request whose slate is properly STAFFED — one real, designated user. */
+  const staffedInput = (extra: Record<string, any> = {}) => ({
+    object: 'opportunity', recordId: 'opp1', runId: 'run_1', nodeId: 'co_sign',
+    flowName: 'showcase_dynamic_approval',
+    config: {
+      approvers: [{ type: 'user' as const, value: 'u9' }],
+      behavior: 'first_response' as const, lockRecord: true,
+    },
+    record: { id: 'opp1', amount: 100 },
+    ...extra,
+  });
+
+  it('the repro: the slate names exactly one designated user, and the admin is not on it', async () => {
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    expect(req.pending_approvers).toEqual(['u9']);
+    expect(req.pending_approvers).not.toContain('root');
+  });
+
+  it('marks an admin override of a STAFFED slate as `via_override`', async () => {
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.decideNode(req.id, { decision: 'approve', actorId: 'root', comment: 'not mine' }, ADMIN);
+
+    const acts = await svc.listActions(req.id, SYS);
+    const decision = acts.at(-1)!;
+    expect(decision).toMatchObject({ action: 'approve', actor_id: 'root', comment: 'not mine' });
+    // The bit the audit trail used to drop entirely.
+    expect(decision.via_override).toBe(true);
+  });
+
+  it('does NOT mark the designated approver’s own approval', async () => {
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.decideNode(req.id, { decision: 'approve', actorId: 'u9' }, DESIGNATED);
+
+    const decision = (await svc.listActions(req.id, SYS)).at(-1)!;
+    expect(decision).toMatchObject({ action: 'approve', actor_id: 'u9' });
+    // An explicit `false`, not absent: "checked, and it was not an override" is
+    // a different claim from a legacy row's "not recorded".
+    expect(decision.via_override).toBe(false);
+  });
+
+  it('does NOT mark an admin who is ALSO a designated approver — that is an ordinary approval', async () => {
+    // The marker is about which BRANCH admitted the call, not about whether the
+    // actor happens to hold admin rights. Collapsing the two would make every
+    // admin's ordinary decision read as a slate bypass.
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.decideNode(req.id, { decision: 'approve', actorId: 'u9' }, ADMIN_ON_SLATE);
+
+    expect((await svc.listActions(req.id, SYS)).at(-1)!.via_override).toBe(false);
+  });
+
+  it('marks an override REJECTION too — the direction of the decision is irrelevant', async () => {
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.decideNode(req.id, { decision: 'reject', actorId: 'root' }, ADMIN);
+
+    const decision = (await svc.listActions(req.id, SYS)).at(-1)!;
+    expect(decision).toMatchObject({ action: 'reject', via_override: true });
+  });
+
+  it('the override and the ordinary approval are no longer identical rows', async () => {
+    // The issue's core claim, asserted directly: before the column, these two
+    // decisions differed only in `actor_id` — and an `actor_id` alone cannot
+    // answer "were they entitled to?".
+    const a = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.decideNode(a.id, { decision: 'approve', actorId: 'root' }, ADMIN);
+    const overrideRow = (await svc.listActions(a.id, SYS)).at(-1)!;
+
+    const b = await svc.openNodeRequest(
+      staffedInput({ recordId: 'opp2', runId: 'run_2', record: { id: 'opp2', amount: 100 } }),
+      SUBMITTER,
+    );
+    await svc.decideNode(b.id, { decision: 'approve', actorId: 'u9' }, DESIGNATED);
+    const normalRow = (await svc.listActions(b.id, SYS)).at(-1)!;
+
+    expect(overrideRow.action).toBe(normalRow.action);
+    expect(overrideRow.via_override).not.toBe(normalRow.via_override);
+  });
+
+  it('marks an admin RESCUE reassign of a slate they hold no slot in', async () => {
+    // #3424's other privileged action: handing a stuck (or staffed) request to
+    // a real approver. Same fact, same column.
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.reassign(req.id, { actorId: 'root', to: 'u7' }, ADMIN);
+
+    const row = (await svc.listActions(req.id, SYS)).at(-1)!;
+    expect(row).toMatchObject({ action: 'reassign', reassign_to: 'u7', via_override: true });
+  });
+
+  it('does NOT mark a slot holder handing over their own slot', async () => {
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    await svc.reassign(req.id, { actorId: 'u9', to: 'u7' }, DESIGNATED);
+
+    expect((await svc.listActions(req.id, SYS)).at(-1)!.via_override).toBe(false);
+  });
+
+  it('a legacy row (written before the column existed) reads as UNRECORDED, not as "not an override"', async () => {
+    const req = await svc.openNodeRequest(staffedInput(), SUBMITTER);
+    // Simulate a row persisted by an older build: the column is simply absent.
+    const rows = engine._tables['sys_approval_action'];
+    delete rows[rows.length - 1].via_override;
+
+    const row = (await svc.listActions(req.id, SYS)).at(-1)!;
+    expect(row.via_override).toBeUndefined();
+    expect(row.via_override).not.toBe(false);
+  });
+});