Add [[maybe_unused]] to silence unhelpful warnings

database/userdaosqlite.cpp

@@ -116,7 +116,7 @@ std::vector<User> UserDaoSqlite::list(QueryOption o)
 	return result;
 }
 
-void UserDaoSqlite::deleteUser(std::string username)
+void UserDaoSqlite::deleteUser([[maybe_unused]] std::string username)
 {
 	// What to do with the contributions of the user?
 }