feat: add id3 tags storage

backend/lib/db.ts

@@ -0,0 +1,28 @@
+import Database, { type Database as DatabaseType } from "better-sqlite3";
+import path from "node:path";
+import fs from "node:fs";
+import { fileURLToPath } from "url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export const loadDb = (
+  filename: string,
+  onCreate?: (db: DatabaseType) => void
+) => {
+  const dbDir = path.resolve(__dirname, "../storage/db");
+  if (!fs.existsSync(dbDir)) {
+    fs.mkdirSync(dbDir, { recursive: true });
+  }
+
+  const dbPath = path.resolve(dbDir, filename + ".db");
+  const isDbExist = fs.existsSync(dbPath);
+
+  const db = new Database(dbPath);
+  db.pragma("journal_mode = WAL");
+
+  if (!isDbExist && onCreate) {
+    onCreate(db);
+  }
+
+  return db;
+};