fix migrate-data.ts postgres connection for unix socket

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/migrate-data.ts

@@ -30,7 +30,15 @@ const maria = await mysql.createConnection({
 	timezone: "+00:00",
 });
 
-const pg = postgres(PG_URL);
+const pgUrl = new URL(PG_URL);
+const socketHost = pgUrl.searchParams.get("host");
+const pg = postgres({
+	host: socketHost ?? pgUrl.hostname,
+	port: Number(pgUrl.port) || 5432,
+	database: pgUrl.pathname.slice(1),
+	username: pgUrl.username,
+	password: pgUrl.password,
+});
 
 // Order: rounds → round_users → movies → votes → round_history (FK constraint order)