public Mono<DeleteResult> deleteBlockedUsers(
            @NotEmpty Set<GroupBlockedUser.@ValidGroupBlockedUserKey Key> keys) {
        try {
            Validator.notEmpty(keys, "keys");
            for (GroupBlockedUser.Key key : keys) {
                DataValidator.validGroupBlockedUserKey(key);
            }
        } catch (ResponseException e) {
            return Mono.error(e);
        }
        return groupBlocklistRepository.deleteByIds(keys);
    }
@return whether the user to unblock was blocked
turms-service/src/main/java/im/turms/service/domain/group/service/GroupBlocklistService.java