feat(finalist): re-invite-safe confirmation reset helper

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/finalist-enrollment.test.ts

@@ -0,0 +1,60 @@
+import { afterAll, describe, expect, it } from 'vitest'
+import { prisma } from '../setup'
+import { createTestProgram, createTestProject, cleanupTestData, uid } from '../helpers'
+import { resetOrCreatePendingConfirmation } from '../../src/server/services/finalist-enrollment'
+
+describe('resetOrCreatePendingConfirmation', () => {
+  const programIds: string[] = []
+  afterAll(async () => {
+    for (const id of programIds) {
+      await prisma.attendingMember.deleteMany({ where: { confirmation: { project: { programId: id } } } })
+      await prisma.finalistConfirmation.deleteMany({ where: { project: { programId: id } } })
+      await cleanupTestData(id, [])
+    }
+  })
+
+  it('creates a fresh PENDING row when none exists', async () => {
+    const program = await createTestProgram({ name: `reinvite-new-${uid()}` })
+    programIds.push(program.id)
+    const project = await createTestProject(program.id, { competitionCategory: 'STARTUP' })
+    const res = await resetOrCreatePendingConfirmation(prisma, {
+      projectId: project.id, category: 'STARTUP', windowHours: 24,
+    })
+    const row = await prisma.finalistConfirmation.findUniqueOrThrow({ where: { id: res.id } })
+    expect(row.status).toBe('PENDING')
+    expect(res.alreadyConfirmed).toBe(false)
+  })
+
+  it('resets a DECLINED row to a fresh PENDING (no unique-constraint crash)', async () => {
+    const program = await createTestProgram({ name: `reinvite-declined-${uid()}` })
+    programIds.push(program.id)
+    const project = await createTestProject(program.id, { competitionCategory: 'STARTUP' })
+    await prisma.finalistConfirmation.create({
+      data: { projectId: project.id, category: 'STARTUP', status: 'DECLINED',
+        deadline: new Date(Date.now() - 1000), token: `tok_${uid()}`, declinedAt: new Date(),
+        declineReason: 'busy' },
+    })
+    const res = await resetOrCreatePendingConfirmation(prisma, {
+      projectId: project.id, category: 'STARTUP', windowHours: 24,
+    })
+    const row = await prisma.finalistConfirmation.findUniqueOrThrow({ where: { id: res.id } })
+    expect(row.status).toBe('PENDING')
+    expect(row.declinedAt).toBeNull()
+    expect(row.declineReason).toBeNull()
+    expect(res.alreadyConfirmed).toBe(false)
+  })
+
+  it('is a no-op flagged alreadyConfirmed when row is CONFIRMED', async () => {
+    const program = await createTestProgram({ name: `reinvite-confirmed-${uid()}` })
+    programIds.push(program.id)
+    const project = await createTestProject(program.id, { competitionCategory: 'STARTUP' })
+    await prisma.finalistConfirmation.create({
+      data: { projectId: project.id, category: 'STARTUP', status: 'CONFIRMED',
+        deadline: new Date(Date.now() + 1000), token: `tok_${uid()}`, confirmedAt: new Date() },
+    })
+    const res = await resetOrCreatePendingConfirmation(prisma, {
+      projectId: project.id, category: 'STARTUP', windowHours: 24,
+    })
+    expect(res.alreadyConfirmed).toBe(true)
+  })
+})