chore: add config, prisma schema and client (Prisma 7 adapter)

config/app.config.ts

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+export const config = {
+  DOWNLOAD_LINK_TTL_HOURS: 24,
+  WORKER_CONCURRENCY: 3,
+  WORKER_POLL_INTERVAL_MS: 10_000,
+  STORAGE_PATH: process.env.STORAGE_PATH ?? '',
+  RATE_LIMIT_MAX: 5,
+  RATE_LIMIT_WINDOW_MS: 3_600_000,
+} as const

prisma.config.ts

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+import 'dotenv/config'
+import { defineConfig, env } from 'prisma/config'
+
+export default defineConfig({
+  schema: 'prisma/schema.prisma',
+  migrations: {
+    path: 'prisma/migrations',
+  },
+  datasource: {
+    url: env('DATABASE_URL'),
+  },
+})

prisma/migrations/20260810122259_init/migration.sql

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+-- CreateTable
+CREATE TABLE `Download` (
+    `id` VARCHAR(191) NOT NULL,
+    `uuid` VARCHAR(191) NOT NULL,
+    `url` TEXT NOT NULL,
+    `status` ENUM('PENDING', 'PROCESSING', 'DONE', 'FAILED', 'FILE_DELETED') NOT NULL DEFAULT 'PENDING',
+    `format` VARCHAR(191) NOT NULL,
+    `quality` VARCHAR(191) NOT NULL,
+    `subtitles` BOOLEAN NOT NULL DEFAULT false,
+    `extraArgs` TEXT NULL,
+    `filePath` TEXT NULL,
+    `fileName` VARCHAR(191) NULL,
+    `fileSize` BIGINT NULL,
+    `errorMsg` TEXT NULL,
+    `ipAddress` VARCHAR(191) NOT NULL,
+    `submittedAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `startedAt` DATETIME(3) NULL,
+    `completedAt` DATETIME(3) NULL,
+    `deletedAt` DATETIME(3) NULL,
+
+    UNIQUE INDEX `Download_uuid_key`(`uuid`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- CreateTable
+CREATE TABLE `DownloadToken` (
+    `id` VARCHAR(191) NOT NULL,
+    `downloadId` VARCHAR(191) NOT NULL,
+    `token` VARCHAR(191) NOT NULL,
+    `expiresAt` DATETIME(3) NOT NULL,
+    `usedAt` DATETIME(3) NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+
+    UNIQUE INDEX `DownloadToken_token_key`(`token`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AddForeignKey
+ALTER TABLE `DownloadToken` ADD CONSTRAINT `DownloadToken_downloadId_fkey` FOREIGN KEY (`downloadId`) REFERENCES `Download`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;

prisma/migrations/migration_lock.toml

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+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "mysql"

prisma/schema.prisma

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+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "mysql"
+}
+
+model Download {
+  id          String    @id @default(cuid())
+  uuid        String    @unique @default(uuid())
+  url         String    @db.Text
+  status      Status    @default(PENDING)
+  format      String
+  quality     String
+  subtitles   Boolean   @default(false)
+  extraArgs   String?   @db.Text
+
+  filePath    String?   @db.Text
+  fileName    String?
+  fileSize    BigInt?
+  errorMsg    String?   @db.Text
+
+  ipAddress   String
+  submittedAt DateTime  @default(now())
+  startedAt   DateTime?
+  completedAt DateTime?
+  deletedAt   DateTime?
+
+  tokens      DownloadToken[]
+}
+
+model DownloadToken {
+  id         String    @id @default(cuid())
+  download   Download  @relation(fields: [downloadId], references: [id])
+  downloadId String
+  token      String    @unique @default(uuid())
+  expiresAt  DateTime
+  usedAt     DateTime?
+  createdAt  DateTime  @default(now())
+}
+
+enum Status {
+  PENDING
+  PROCESSING
+  DONE
+  FAILED
+  FILE_DELETED
+}

src/lib/prisma.ts

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+import 'dotenv/config'
+import { PrismaClient } from '@prisma/client'
+import { PrismaMariaDb } from '@prisma/adapter-mariadb'
+
+function createPrismaClient() {
+  const url = process.env.DATABASE_URL
+  if (!url) throw new Error('DATABASE_URL is not set')
+  const adapter = new PrismaMariaDb(url)
+  return new PrismaClient({ adapter })
+}
+
+const globalForPrisma = globalThis as unknown as { prisma: PrismaClient }
+
+export const prisma = globalForPrisma.prisma ?? createPrismaClient()
+
+if (process.env.NODE_ENV !== 'production') globalForPrisma.prisma = prisma