---

 private Map<UUID, String> findUpdates(Map<UUID, String> userIdToFullName) {
        List<UUID> userIds = new ArrayList<>(userIdToFullName.keySet());
        String sql = 
SQL_SELECT_CURRENT_RECIPIENT_NAMES_TEMPLATE.formatted(placeholders(userIds.size()));
        return jdbcTemplate.query(
                sql,
Make sure using a dynamically formatted SQL query is safe here.