addUploader method
Implementation
@override
FutureOr addUploader(String name, String email) async {
final existing = await query(name);
if (existing != null) {
throw '$name not exist!';
}
existing!.uploaders!.add(email);
_db.execute(
"UPDATE meta SET record = ? WHERE json_extract(record, '\$.name') = ?",
[jsonEncode(existing), name]);
}