diff --git a/apps/api/src/gateway/gateway.service.ts b/apps/api/src/gateway/gateway.service.ts
index a67bcadc7..6f40e6940 100644
--- a/apps/api/src/gateway/gateway.service.ts
+++ b/apps/api/src/gateway/gateway.service.ts
@@ -3,7 +3,7 @@ import type { webcrypto } from 'node:crypto';
 import { HybridCrypto } from '@douglasneuroinformatics/libcrypto';
 import { LoggingService } from '@douglasneuroinformatics/libnest';
 import { HttpService } from '@nestjs/axios';
-import { BadGatewayException, HttpStatus, Injectable } from '@nestjs/common';
+import { BadGatewayException, HttpStatus, Injectable, InternalServerErrorException } from '@nestjs/common';
 import { $MutateAssignmentResponseBody, $RemoteAssignment } from '@opendatacapture/schemas/assignment';
 import type {
   Assignment,
@@ -12,18 +12,20 @@ import type {
   RemoteAssignment
 } from '@opendatacapture/schemas/assignment';
 import { $GatewayHealthcheckSuccessResult } from '@opendatacapture/schemas/gateway';
-import type { GatewayHealthcheckFailureResult, GatewayHealthcheckResult } from '@opendatacapture/schemas/gateway';
+import type {
+  GatewayHealthcheckFailureResult,
+  GatewayHealthcheckResult,
+  RemoteSetupState
+} from '@opendatacapture/schemas/gateway';
 
 import { InstrumentsService } from '@/instruments/instruments.service';
-import { SetupService } from '@/setup/setup.service';
 
 @Injectable()
 export class GatewayService {
   constructor(
     private readonly httpService: HttpService,
     private readonly instrumentsService: InstrumentsService,
-    private readonly loggingService: LoggingService,
-    private readonly setupService: SetupService
+    private readonly loggingService: LoggingService
   ) {}
 
   async createRemoteAssignment(
@@ -31,12 +33,8 @@ export class GatewayService {
     publicKey: webcrypto.CryptoKey
   ): Promise<MutateAssignmentResponseBody> {
     const instrument = await this.instrumentsService.findBundleById(assignment.instrumentId);
-    // The gateway cannot read this instance's setup state, so the languages it may offer this
-    // patient are sent with the assignment.
-    const { activeLanguages } = await this.setupService.getState();
     const response = await this.httpService.axiosRef.post(`/api/assignments`, {
       ...assignment,
-      activeLanguages,
       instrumentContainer: instrument,
       publicKey: Array.from(await HybridCrypto.serializePublicKey(publicKey))
     } satisfies CreateRemoteAssignmentInputData);
@@ -106,4 +104,19 @@ export class GatewayService {
     }
     return result.data;
   }
+
+  /**
+   * Replace the setup state held by the gateway. The gateway cannot reach this instance, so it
+   * learns of a change only by being told; it is told on every synchronization pass rather than
+   * only when the state changes, which is what lets a gateway that missed the change — restarting,
+   * unreachable, redeployed with an empty in-memory copy — catch up on its own.
+   */
+  async updateRemoteSetupState(setupState: RemoteSetupState): Promise<void> {
+    const response = await this.httpService.axiosRef.put(`/api/setup-state`, setupState);
+    if (response.status !== HttpStatus.NO_CONTENT) {
+      throw new InternalServerErrorException(`Unexpected Status Code From Gateway: ${response.status}`, {
+        cause: response.statusText
+      });
+    }
+  }
 }
diff --git a/apps/api/src/gateway/gateway.synchronizer.ts b/apps/api/src/gateway/gateway.synchronizer.ts
index 497b110f5..b6b35eddd 100644
--- a/apps/api/src/gateway/gateway.synchronizer.ts
+++ b/apps/api/src/gateway/gateway.synchronizer.ts
@@ -45,6 +45,18 @@ export class GatewaySynchronizer implements OnApplicationBootstrap {
     }
 
     this.loggingService.log('Synchronizing with gateway...');
+
+    // A failure here must not stop assignments from synchronizing: the two are independent, and
+    // the next pass sends the state again.
+    try {
+      await this.gatewayService.updateRemoteSetupState({ activeLanguages: setupState.activeLanguages });
+    } catch (err) {
+      this.loggingService.error({
+        cause: err,
+        error: 'Failed to Update Remote Setup State'
+      });
+    }
+
     let remoteAssignments: RemoteAssignment[];
     try {
       remoteAssignments = await this.gatewayService.fetchRemoteAssignments();
diff --git a/apps/gateway/AGENTS.md b/apps/gateway/AGENTS.md
index 94e584259..cb6b98fd9 100644
--- a/apps/gateway/AGENTS.md
+++ b/apps/gateway/AGENTS.md
@@ -5,6 +5,14 @@ rendered. `apps/api` is its only programmatic client — `apps/api/src/gateway/g
 creates, fetches and deletes assignments here over HTTP, and the patient is given a link to
 `/assignments/:id`.
 
+**Traffic only ever flows API → gateway.** This app holds no address or credential for the API, so
+it cannot ask for anything: whatever it needs to know about the instance it serves has to be pushed.
+`PUT /api/setup-state` is that push, and `GatewaySynchronizer` in `apps/api` sends it on every pass
+(every `GATEWAY_REFRESH_INTERVAL`, unconditionally) rather than only when the state changes. That is
+what makes this app's copy safe to keep in memory: whatever it missed — the change itself, or its
+whole copy across a restart — it is told again within one interval, so the window on
+`DEFAULT_ACTIVE_LANGUAGES` is bounded without either side tracking what the other holds.
+
 Read the root `AGENTS.md` first for the rules that apply everywhere.
 
 **There is no client-side router, no TanStack Query and no Zustand.** Express routing
@@ -61,12 +69,14 @@ Its own SQLite database, entirely separate from the API's MongoDB: `prisma/schem
 (`RemoteAssignmentModel`), generated to `node_modules/@prisma/generated-client` and wrapped in
 `src/lib/prisma.ts` with a computed `getPublicKey()`.
 
-A `Json` column is typed by `prisma-json-types-generator`, the same generator `apps/api` uses: a
-`/// [TypeName]` docstring above the field names a type from the `PrismaJson` namespace declared in
-`src/typings/prisma-json-types-generator.d.ts`, and the generated client uses it on both the read
-and the write side. **The name must exist in that namespace** — the generator emits the reference
-either way, so a typo surfaces as an unresolved type in the generated client rather than an error
-from `prisma generate`.
+**SQLite has no array or JSON column type**, so a non-scalar is serialized into a `String` and parsed
+back on read — `targetStringified`, validated with `$InstrumentBundleContainer` in
+`src/routers/root.router.ts`.
+
+Everything else this app knows is in memory, and deliberately: the assignment verification set
+(`src/lib/assignment-verification.ts`) and the instance's setup state (`src/lib/setup-state.ts`).
+Neither is a record of something that happened here — one is a short-lived gate, the other a copy of
+state `apps/api` owns — so persisting either would only add a second copy that can disagree.
 
 `GATEWAY_DATABASE_URL` is an absolute `file:` URL written by `pnpm generate:env`. Turbo runs
 `db:push` before `dev`, `lint`, `test:e2e` and — via the `@opendatacapture/gateway#build` key in
@@ -90,8 +100,8 @@ hydrated tree can disagree with the SSR'd HTML until you do.
 ## Conventions specific to here
 
 - `@/` aliases `src/`, declared in both `vite.config.ts` and `tsconfig.json`.
-- Ambient declarations live in `src/typings/` and `src/vite-env.d.ts`: the `PrismaJson` namespace,
-  `res.locals.loadRoot`, `window.__ROOT_PROPS__`, the `cap-widget` JSX element, `__RELEASE__`.
+- Ambient declarations live in `src/typings/` and `src/vite-env.d.ts`: `res.locals.loadRoot`,
+  `window.__ROOT_PROPS__`, the `cap-widget` JSX element, `__RELEASE__`.
 - The eslint blocks for `apps/web` and `packages/react-core` (no default exports, no bare `clsx`,
   `jsx-no-literals`) **do not cover this app**, and default exports are in use. Translation is still
   required, and there are no translation resource files — `src/services/i18n.ts` initializes with
diff --git a/apps/gateway/package.json b/apps/gateway/package.json
index d1d158b65..297ce32fa 100644
--- a/apps/gateway/package.json
+++ b/apps/gateway/package.json
@@ -50,7 +50,6 @@
     "esbuild": "catalog:",
     "nodemon": "catalog:",
     "prisma": "catalog:",
-    "prisma-json-types-generator": "^3.2.2",
     "tailwindcss": "catalog:",
     "tsx": "catalog:",
     "type-fest": "workspace:type-fest__4.x@*",
diff --git a/apps/gateway/prisma/schema.prisma b/apps/gateway/prisma/schema.prisma
index de52ff809..8ebf4bcb1 100644
--- a/apps/gateway/prisma/schema.prisma
+++ b/apps/gateway/prisma/schema.prisma
@@ -7,10 +7,6 @@ generator client {
   binaryTargets = ["native", "debian-openssl-1.1.x"]
 }
 
-generator json {
-  provider = "prisma-json-types-generator"
-}
-
 datasource db {
   provider = "sqlite"
   url      = env("GATEWAY_DATABASE_URL")
@@ -18,9 +14,6 @@ datasource db {
 
 model RemoteAssignmentModel {
   id                String    @id
-  /// [ActiveLanguages]
-  // The default covers assignments created before an instance could choose which languages to offer.
-  activeLanguages   Json      @default("[\"en\",\"fr\"]")
   createdAt         DateTime  @default(now())
   completedAt       DateTime?
   expiresAt         DateTime
diff --git a/apps/gateway/src/lib/setup-state.ts b/apps/gateway/src/lib/setup-state.ts
new file mode 100644
index 000000000..37165c03e
--- /dev/null
+++ b/apps/gateway/src/lib/setup-state.ts
@@ -0,0 +1,21 @@
+import { DEFAULT_ACTIVE_LANGUAGES } from '@opendatacapture/schemas/core';
+import type { ActiveLanguages } from '@opendatacapture/schemas/core';
+import type { RemoteSetupState } from '@opendatacapture/schemas/gateway';
+
+/**
+ * The setup state of the instance this gateway serves, as last pushed by `apps/api`.
+ *
+ * Held in memory, consistent with the verification set in `assignment-verification.ts`. It is a
+ * copy of state the API owns rather than a record of anything that happens here, and the API
+ * re-sends it every `GATEWAY_REFRESH_INTERVAL`, so a restart costs at most one interval on the
+ * defaults below.
+ */
+let setupState: null | RemoteSetupState = null;
+
+export function getActiveLanguages(): ActiveLanguages {
+  return setupState?.activeLanguages ?? DEFAULT_ACTIVE_LANGUAGES;
+}
+
+export function updateSetupState(state: RemoteSetupState): void {
+  setupState = state;
+}
diff --git a/apps/gateway/src/routers/api.router.ts b/apps/gateway/src/routers/api.router.ts
index fcf4a4de4..6b64db71e 100644
--- a/apps/gateway/src/routers/api.router.ts
+++ b/apps/gateway/src/routers/api.router.ts
@@ -5,11 +5,13 @@ import type {
   MutateAssignmentResponseBody,
   RemoteAssignment
 } from '@opendatacapture/schemas/assignment';
+import { $RemoteSetupState } from '@opendatacapture/schemas/gateway';
 import type { GatewayHealthcheckSuccessResult } from '@opendatacapture/schemas/gateway';
 import { Router } from 'express';
 
 import { clearAssignmentVerification, isAssignmentVerified } from '@/lib/assignment-verification';
 import { prisma } from '@/lib/prisma';
+import { updateSetupState } from '@/lib/setup-state';
 import { logger } from '@/logger';
 import { ah } from '@/utils/async-handler';
 import { HttpException } from '@/utils/http-exception';
@@ -47,12 +49,11 @@ router.post(
       logger.error(result.error.issues);
       throw new HttpException(400, 'Bad Request');
     }
-    const { activeLanguages, instrumentContainer, publicKey, ...assignment } = result.data;
+    const { instrumentContainer, publicKey, ...assignment } = result.data;
 
     await prisma.remoteAssignmentModel.create({
       data: {
         ...assignment,
-        activeLanguages,
         rawPublicKey: Buffer.from(publicKey),
         targetStringified: JSON.stringify(instrumentContainer)
       }
@@ -139,6 +140,21 @@ router.delete(
   })
 );
 
+// A full replacement rather than a patch, so a retry, a duplicate and the periodic reconcile in
+// `apps/api` are all the same request.
+router.put(
+  '/setup-state',
+  ah(async (req, res) => {
+    const result = await $RemoteSetupState.safeParseAsync(req.body);
+    if (!result.success) {
+      logger.error(result.error.issues);
+      throw new HttpException(400, 'Bad Request');
+    }
+    updateSetupState(result.data);
+    res.status(204).end();
+  })
+);
+
 router.get('/healthcheck', (_, res) => {
   res.status(200).json({
     ok: true,
diff --git a/apps/gateway/src/routers/root.router.ts b/apps/gateway/src/routers/root.router.ts
index 1ede9cb45..5df44ff43 100644
--- a/apps/gateway/src/routers/root.router.ts
+++ b/apps/gateway/src/routers/root.router.ts
@@ -3,6 +3,7 @@ import { $InstrumentBundleContainer } from '@opendatacapture/schemas/instrument'
 import { Router } from 'express';
 
 import { prisma } from '@/lib/prisma';
+import { getActiveLanguages } from '@/lib/setup-state';
 import { logger } from '@/logger';
 import type { RootProps } from '@/Root';
 import { ah } from '@/utils/async-handler';
@@ -43,7 +44,7 @@ router.get(
 
     // Read server-side rather than from `window.location` so the SSR pass and the hydration pass
     // resolve the same language; anything else renders the page in English and then swaps it.
-    const { activeLanguages } = assignment;
+    const activeLanguages = getActiveLanguages();
     const requestedLanguage = $Language.safeParse(req.query.lang);
     const language =
       requestedLanguage.success && activeLanguages.includes(requestedLanguage.data)
diff --git a/apps/gateway/src/typings/prisma-json-types-generator.d.ts b/apps/gateway/src/typings/prisma-json-types-generator.d.ts
deleted file mode 100644
index c3a5d1081..000000000
--- a/apps/gateway/src/typings/prisma-json-types-generator.d.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import type { ActiveLanguages as SchemaActiveLanguages } from '@opendatacapture/schemas/core';
-
-declare global {
-  namespace PrismaJson {
-    type ActiveLanguages = SchemaActiveLanguages;
-  }
-}
diff --git a/package.json b/package.json
index 5b128f785..99a47d108 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "opendatacapture",
   "type": "module",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "private": true,
   "packageManager": "pnpm@10.34.3",
   "license": "Apache-2.0",
diff --git a/packages/instrument-bundler/package.json b/packages/instrument-bundler/package.json
index a423924f8..ada48d5fa 100644
--- a/packages/instrument-bundler/package.json
+++ b/packages/instrument-bundler/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opendatacapture/instrument-bundler",
   "type": "module",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "sideEffects": [
     "**/cli.ts"
   ],
diff --git a/packages/instrument-guidelines/package.json b/packages/instrument-guidelines/package.json
index a815d9360..225346e99 100644
--- a/packages/instrument-guidelines/package.json
+++ b/packages/instrument-guidelines/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opendatacapture/instrument-guidelines",
   "type": "module",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "description": "Guidelines for authoring Open Data Capture instruments, intended to be read by an AI agent (e.g. Claude Code).",
   "license": "Apache-2.0",
   "publishConfig": {
diff --git a/packages/playground-url/package.json b/packages/playground-url/package.json
index cb61b3d6c..887291f76 100644
--- a/packages/playground-url/package.json
+++ b/packages/playground-url/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opendatacapture/playground-url",
   "type": "module",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "sideEffects": [
     "**/cli.ts"
   ],
diff --git a/packages/schemas/src/assignment/assignment.ts b/packages/schemas/src/assignment/assignment.ts
index 9262b8910..98d09cded 100644
--- a/packages/schemas/src/assignment/assignment.ts
+++ b/packages/schemas/src/assignment/assignment.ts
@@ -1,7 +1,7 @@
 import { $Uint8ArrayLike } from '@douglasneuroinformatics/libjs';
 import { z } from 'zod/v4';
 
-import { $ActiveLanguages, $BaseModel, $Json } from '../core/core.js';
+import { $BaseModel, $Json } from '../core/core.js';
 import { $InstrumentBundleContainer } from '../instrument/instrument.base.js';
 export const $AssignmentStatus = z.enum(['CANCELED', 'COMPLETE', 'EXPIRED', 'OUTSTANDING']);
 
@@ -39,16 +39,9 @@ export const $CreateAssignmentData = z.object({
   subjectId: z.string()
 });
 
-/**
- * The DTO transferred from the core API to the external gateway when creating an assignment.
- *
- * The gateway has its own database and cannot read the instance's setup state, so the languages it
- * may offer this patient travel with the assignment. They are a snapshot taken at creation: an
- * assignment already sent keeps the languages it was created with.
- */
+/** The DTO transferred from the core API to the external gateway when creating an assignment. */
 export type CreateRemoteAssignmentInputData = z.input<typeof $CreateRemoteAssignmentData>;
 export const $CreateRemoteAssignmentData = $RemoteAssignment.omit({ encryptedData: true, symmetricKey: true }).extend({
-  activeLanguages: $ActiveLanguages,
   instrumentContainer: $InstrumentBundleContainer,
   publicKey: $Uint8ArrayLike
 });
diff --git a/packages/schemas/src/gateway/gateway.ts b/packages/schemas/src/gateway/gateway.ts
index 58d93fda5..0ea26ee5c 100644
--- a/packages/schemas/src/gateway/gateway.ts
+++ b/packages/schemas/src/gateway/gateway.ts
@@ -1,7 +1,20 @@
 import { z } from 'zod/v4';
 
+import { $ActiveLanguages } from '../core/core.js';
 import { $ReleaseInfo } from '../setup/setup.js';
 
+/**
+ * The instance-level state the gateway needs in order to render an assignment, pushed by `apps/api`
+ * on every synchronization pass. Deliberately a projection of `SetupState` rather than the whole
+ * shape: the rest of it either describes the API's own process (`release`, `uptime`) or gates UI the
+ * gateway does not have, and the gateway is reachable from outside the instance's network, so it
+ * should hold only what it renders.
+ */
+export type RemoteSetupState = z.infer<typeof $RemoteSetupState>;
+export const $RemoteSetupState = z.object({
+  activeLanguages: $ActiveLanguages
+});
+
 export type GatewayHealthcheckSuccessResult = z.infer<typeof $GatewayHealthcheckSuccessResult>;
 export const $GatewayHealthcheckSuccessResult = z.object({
   ok: z.literal(true),
diff --git a/packages/serve-instrument/package.json b/packages/serve-instrument/package.json
index 539fa07e3..391d183c6 100644
--- a/packages/serve-instrument/package.json
+++ b/packages/serve-instrument/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opendatacapture/serve-instrument",
   "type": "module",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "license": "Apache-2.0",
   "publishConfig": {
     "access": "public"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6680d110c..448760668 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -469,9 +469,6 @@ importers:
       prisma:
         specifier: 'catalog:'
         version: 6.19.3(typescript@6.0.3)
-      prisma-json-types-generator:
-        specifier: ^3.2.2
-        version: 3.6.2(@prisma/client@6.19.3(prisma@6.19.3(typescript@6.0.3))(typescript@6.0.3))(prisma@6.19.3(typescript@6.0.3))(typescript@6.0.3)
       tailwindcss:
         specifier: 'catalog:'
         version: 4.3.0
diff --git a/runtime/v1/package.json b/runtime/v1/package.json
index b5f59beec..28d7070a2 100644
--- a/runtime/v1/package.json
+++ b/runtime/v1/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opendatacapture/runtime-v1",
   "type": "module",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "author": {
     "name": "Douglas Neuroinformatics",
     "email": "support@douglasneuroinformatics.ca"