feat: enhance tickets portal and admin flows

src/app/api/admin/invites/route.ts

@@ -1,9 +1,9 @@
 import { NextResponse } from "next/server"
 import { randomBytes } from "crypto"
 
+import { Prisma } from "@prisma/client"
 import { ConvexHttpClient } from "convex/browser"
 
-// @ts-expect-error Convex runtime API lacks generated types at build time in Next routes
 import { api } from "@/convex/_generated/api"
 import { assertAdminSession } from "@/lib/auth-server"
 import { DEFAULT_TENANT_ID } from "@/lib/constants"
@@ -14,6 +14,13 @@ import { computeInviteStatus, normalizeInvite, type InviteWithEvents, type Norma
 
 const DEFAULT_EXPIRATION_DAYS = 7
 
+function toJsonPayload(payload: unknown): Prisma.InputJsonValue | Prisma.NullableJsonNullValueInput {
+  if (payload === null || payload === undefined) {
+    return Prisma.JsonNull
+  }
+  return payload as Prisma.InputJsonValue
+}
+
 function normalizeRole(input: string | null | undefined): RoleOption {
   const role = (input ?? "agent").toLowerCase() as RoleOption
   return (ROLE_OPTIONS as readonly string[]).includes(role) ? role : "agent"
@@ -52,7 +59,7 @@ async function appendEvent(inviteId: string, type: string, actorId: string | nul
     data: {
       inviteId,
       type,
-      payload,
+      payload: toJsonPayload(payload),
       actorId,
     },
   })