feat: add Drizzle ORM database layer

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/db/index.js

@@ -0,0 +1,14 @@
+import { drizzle } from 'drizzle-orm/postgres-js';
+import postgres from 'postgres';
+import logger from '../utils/logger.js';
+import { files } from './schema.js';
+
+const client = postgres(process.env.DATABASE_URL, {
+  max: 10,
+  idle_timeout: 20,
+  connect_timeout: 10
+});
+
+export const db = drizzle(client, { schema: { files } });
+export { files };
+export default db;

src/db/schema.js

@@ -0,0 +1,17 @@
+import { pgTable, text, bigint, timestamp, uuid } from 'drizzle-orm/pg-core';
+
+export const files = pgTable('files', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  publicId: text('public_id').unique().notNull(),
+  telegramFileId: text('telegram_file_id').notNull(),
+  telegramFileUniqueId: text('telegram_file_unique_id').notNull(),
+  storageChatId: bigint('storage_chat_id', { mode: 'number' }).notNull(),
+  storageMessageId: bigint('storage_message_id', { mode: 'number' }).notNull(),
+  fileName: text('file_name').notNull(),
+  mimeType: text('mime_type').notNull(),
+  sizeBytes: bigint('size_bytes', { mode: 'number' }).notNull(),
+  fileType: text('file_type').notNull(),
+  uploaderId: bigint('uploader_id', { mode: 'number' }).notNull(),
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+  updatedAt: timestamp('updated_at').defaultNow().notNull()
+});