first commit

src/db.js

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+import Database from 'better-sqlite3';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const dbPath = path.join(__dirname, '..', 'db', 'tachyon.db');
+
+export const db = new Database(dbPath);
+db.pragma('journal_mode = WAL');