const { prisma } = require('../src/models');
(async () => {
  // Find duplicate chapterIds in TtsTask
  const dups = await prisma.ttsTask.groupBy({
    by: ['chapterId'],
    _count: { id: true },
    having: { id: { _count: { gt: 1 } } },
  });
  console.log(`Chapters with duplicate TtsTask entries: ${dups.length}`);
  
  let totalDeleted = 0;
  for (const d of dups) {
    const tasks = await prisma.ttsTask.findMany({
      where: { chapterId: d.chapterId }, 
      orderBy: { id: 'desc' }, 
      select: { id: true, status: true } 
    });
    const keepId = tasks[0].id;
    const del = await prisma.ttsTask.deleteMany({
      where: { chapterId: d.chapterId, id: { not: keepId } }
    });
    totalDeleted += del.count;
  }
  
  const remaining = await prisma.ttsTask.count();
  console.log(`Deleted ${totalDeleted} duplicates. Remaining: ${remaining}`);
  await prisma.$disconnect();
})();