Remove test files and commit necessary changes

lib/db.ts

@@ -0,0 +1,19 @@
+import { config } from 'dotenv';
+config({ path: '.env.local' });
+
+import { Pool } from 'pg';
+
+console.log('process.env:', process.env);
+const connectionString = process.env.DATABASE_URL;
+
+console.log('DATABASE_URL in lib/db.ts:', connectionString);
+
+if (!connectionString) {
+  throw new Error('DATABASE_URL is not set in environment variables');
+}
+
+const pool = new Pool({
+  connectionString,
+});
+
+export default pool;