Assistant: 
User: 
    Please analyze the following code file and determine whether it belongs to any of the provided modules based on the listed module descriptions.
    Note that the provided list of modules may not be exhaustive, and some files may not belong to any of the modules. 
    If the code belongs to a module, Only output the module name, without any explanation or additional information; otherwise, return 'None' if it does not belong to any module.

    Modules : {
        "UI": "Handles the front-end user interface, consisting of HTML, CSS, and JavaScript files generated by the Angular framework. It processes user requests and interacts with the server using AJAX for data retrieval and client-side interactions."
"Test Driver": "Facilitates automated regression testing and handles transmission of test data in JSON format. It performs Java testing using TestNG and JavaScript unit-testing with Jest. It also sets up a simulated web server for servlet-level tests and automates end-to-end testing using Selenium Java."
"Logic": "Manages the business logic of TEAMMATES, including handling relationships between entities, managing transactions, input value sanitization, access control rights, and interfacing with GAE-provided or third-party APIs."
"Storage": "Performs CRUD operations on data entities, validation of data, and abstraction of GQL queries, hiding the complexities of datastore from the Logic component."
"Common": "Contains utility classes, custom exceptions, and data transfer objects used across the entire application for easy consolidation and transfer of structured data."
"E2E": "Handles end-to-end testing and load & performance testing, providing helpers, abstractions of browser pages, and test cases for E2E tests and L&P tests."
"Client": "Contains scripts for administrative tasks, such as migrating data to a new schema and calculating statistics. This module connects directly to the application back-end for administrative purposes."
    }

    Code: package teammates.storage.api; /** * Handles CRUD operations for account requests. * * @see AccountRequest * @see AccountRequestAttributes */ public final class AccountRequestsDb extends EntitiesDb<AccountRequest, AccountRequestAttributes> { private static final AccountRequestsDb instance = new AccountRequestsDb(); private AccountRequestsDb() { // prevent initialization } public static AccountRequestsDb inst() { return instance; } private AccountRequestSearchManager getSearchManager() { return SearchManagerFactory.getAccountRequestSearchManager(); } /** * Creates or updates search document for the given account request. */ public void putDocument(AccountRequestAttributes accountRequest) throws SearchServiceException { getSearchManager().putDocument(accountRequest); } /** * Searches all account requests in the system. * * <p>This is used by admin to search account requests in the whole system. */ public List<AccountRequestAttributes> searchAccountRequestsInWholeSystem(String queryString) throws SearchServiceException { if (queryString.trim().isEmpty()) { return new ArrayList<>(); } return getSearchManager().searchAccountRequests(queryString); } /** * Gets an account request by email and institute. */ public AccountRequestAttributes getAccountRequest(String email, String institute) { assert email != null; assert institute != null; return makeAttributesOrNull(getAccountRequestEntity(AccountRequest.generateId(email, institute))); } /** * Updates an account request. * * @return the updated account request * @throws InvalidParametersException if the account request is not valid * @throws EntityDoesNotExistException if the account request cannot be found */ public AccountRequestAttributes updateAccountRequest(AccountRequestAttributes.UpdateOptions updateOptions) throws InvalidParametersException, EntityDoesNotExistException { assert updateOptions != null; AccountRequestAttributes accountRequest = getAccountRequest(updateOptions.getEmail(), updateOptions.getInstitute()); if (accountRequest == null) { throw new EntityDoesNotExistException(ERROR_UPDATE_NON_EXISTENT + updateOptions); } accountRequest.update(updateOptions); accountRequest.sanitizeForSaving(); if (!accountRequest.isValid()) { throw new InvalidParametersException(accountRequest.getInvalidityInfo()); } saveEntity(accountRequest.toEntity()); return accountRequest; } /** * Gets an account request by unique constraint {@code registrationKey}. * * @return the account request or null if no match found */ public AccountRequestAttributes getAccountRequestForRegistrationKey(String registrationKey) { assert registrationKey != null; List<AccountRequest> accountRequestList = load().filter("registrationKey =", registrationKey).list(); if (accountRequestList.size() > 1) { log.severe("Duplicate registration keys detected for: " + accountRequestList.stream().map(i -> i.getId()).collect(Collectors.joining(", "))); } if (acco
Assistant: