feat(demo): allow mutations in demo mode via DEMO_READ_ONLY flag (#6224)

packages/api/src/env.ts

@@ -6,9 +6,11 @@ export const env = createEnv({
   server: {
     KUBERNETES_SERVICE_ACCOUNT_NAME: z.string().optional(),
     DEMO_MODE: createBooleanSchema(false),
+    DEMO_READ_ONLY: createBooleanSchema(true),
   },
   runtimeEnv: {
     KUBERNETES_SERVICE_ACCOUNT_NAME: process.env.KUBERNETES_SERVICE_ACCOUNT_NAME,
     DEMO_MODE: process.env.DEMO_MODE,
+    DEMO_READ_ONLY: process.env.DEMO_READ_ONLY,
   },
 });

packages/api/src/router/info.ts

@@ -1,7 +1,7 @@
 import z from "zod/v4";
 
 import packageJson from "../../../../package.json";
-import { createTRPCRouter, isDemoMode, publicProcedure, protectedProcedure } from "../trpc";
+import { createTRPCRouter, isDemoMode, isDemoReadOnly, publicProcedure, protectedProcedure } from "../trpc";
 
 export const infoRouter = createTRPCRouter({
   getInfo: protectedProcedure
@@ -20,4 +20,5 @@ export const infoRouter = createTRPCRouter({
       };
     }),
   isDemoMode: publicProcedure.query(() => isDemoMode),
+  isDemoReadOnly: publicProcedure.query(() => isDemoReadOnly),
 });

packages/api/src/trpc.ts

@@ -95,8 +95,12 @@ export const createTRPCRouter = t.router;
 
 export const isDemoMode = env.DEMO_MODE;
 
+// The public "real demo" (demo + mock integrations) stays read-only, while preview
+// deployments run with DEMO_MODE + DEMO_READ_ONLY=false to allow mutations.
+export const isDemoReadOnly = env.DEMO_MODE && env.DEMO_READ_ONLY;
+
 const enforceDemoModeReadOnly = t.middleware(({ ctx, next, type }) => {
-  if (env.DEMO_MODE && type === "mutation") {
+  if (isDemoReadOnly && type === "mutation") {
     throw new TRPCError({
       code: "FORBIDDEN",
       message: "Mutations are disabled in demo mode",
@@ -105,7 +109,7 @@ const enforceDemoModeReadOnly = t.middleware(({ ctx, next, type }) => {
   return next({ ctx });
 });
 
-const baseProcedure = env.DEMO_MODE ? t.procedure.use(enforceDemoModeReadOnly) : t.procedure;
+const baseProcedure = isDemoReadOnly ? t.procedure.use(enforceDemoModeReadOnly) : t.procedure;
 
 /**
  * Public (unauthed) procedure