Our application has namespaces for each client.
We need to offer the clients sysadmins the possibility of download some of the entities of the namespace for that client (for example users, roles, records) to an excel file, so they can review and edit their data.
Also, the clients' sysadmins can upload the same Excel file with modifications and new rows and data have to be committed to the AppEngine database.
This would be a separate project from the main backend/frontend, Java is preferred.
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