feat: auto-create MemberLunchPick on attendee writes

Adds ensureLunchPickForAttendingMember helper called from confirm,
adminConfirm, and editAttendees attendee-creation paths. No-ops when
the program has no LunchEvent.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/server/routers/finalist.ts

@@ -13,6 +13,7 @@ import {
 } from '../services/in-app-notification'
 import { sendFinalistConfirmationEmail } from '@/lib/email'
 import { verifyFinalistToken } from '@/lib/finalist-token'
+import { ensureLunchPickForAttendingMember } from '../services/lunch-pick-sync'
 
 export const finalistRouter = router({
   /** List all per-category finalist slot quotas for a program. */
@@ -351,6 +352,13 @@ export const finalistRouter = router({
             data: created.map((m) => ({ attendingMemberId: m.id, status: 'REQUESTED' })),
           })
         }
+        const allMembers = await tx.attendingMember.findMany({
+          where: { confirmationId: confirmation.id, userId: { in: input.attendingUserIds } },
+          select: { id: true },
+        })
+        for (const m of allMembers) {
+          await ensureLunchPickForAttendingMember(tx, m.id)
+        }
       })
       await logAudit({
         prisma: ctx.prisma,
@@ -505,6 +513,13 @@ export const finalistRouter = router({
             data: created.map((m) => ({ attendingMemberId: m.id, status: 'REQUESTED' })),
           })
         }
+        const allMembers = await tx.attendingMember.findMany({
+          where: { confirmationId: confirmation.id, userId: { in: input.attendingUserIds } },
+          select: { id: true },
+        })
+        for (const m of allMembers) {
+          await ensureLunchPickForAttendingMember(tx, m.id)
+        }
       })
       await logAudit({
         prisma: ctx.prisma,
@@ -1071,6 +1086,13 @@ export const finalistRouter = router({
               data: created.map((m) => ({ attendingMemberId: m.id, status: 'REQUESTED' })),
             })
           }
+          const newMembers = await tx.attendingMember.findMany({
+            where: { confirmationId: confirmation.id, userId: { in: toCreate } },
+            select: { id: true },
+          })
+          for (const m of newMembers) {
+            await ensureLunchPickForAttendingMember(tx, m.id)
+          }
         }
       })
 

src/server/services/lunch-pick-sync.ts

@@ -0,0 +1,33 @@
+import type { Prisma, PrismaClient } from '@prisma/client'
+
+type PrismaLike = PrismaClient | Prisma.TransactionClient
+
+/**
+ * Ensure a MemberLunchPick row exists for the given AttendingMember.
+ * No-ops when the parent program has no LunchEvent.
+ * Idempotent — safe to call repeatedly.
+ */
+export async function ensureLunchPickForAttendingMember(
+  prisma: PrismaLike,
+  attendingMemberId: string,
+): Promise<void> {
+  const member = await prisma.attendingMember.findUnique({
+    where: { id: attendingMemberId },
+    select: {
+      id: true,
+      confirmation: { select: { project: { select: { programId: true } } } },
+      lunchPick: { select: { id: true } },
+    },
+  })
+  if (!member) return
+  if (member.lunchPick) return
+  const programId = member.confirmation.project.programId
+  const lunchEvent = await prisma.lunchEvent.findUnique({
+    where: { programId },
+    select: { id: true },
+  })
+  if (!lunchEvent) return
+  await prisma.memberLunchPick.create({
+    data: { attendingMemberId: member.id },
+  })
+}