Description
Upsert support for bulk import of users
Problem
We need to implement a feature where admin users can upload a CSV of users for a tenant and have them be upserted.
The problem is there is there is no api that can store a CSV, validate its content, upsert valid users and call a registered webhook with a summary of the result once it is done.
Solution
An api endpoint that can store a CSV, validate its content, upsert valid users and call a registered webhook with a summary of the result once it is done.
The format of the users file is less important than the upsert support. So if the file format is JSON, that's okay.
Alternatives/workarounds
The alternative is to write a process that loops through each record in the CSV file making an API call to create a user for each line, and handle creation errors by making a second API call to update the existing user. This would be ~2 calls per CSV record and could become a performance issue on a 10K record file.
Additional context
We have a large user base per tenant, some have up to 100K users. In our current process, we receive a user update file from our clients every day and we do not know if the user already exists or not in FusionAuth. We have performance concerns with the workaround described above.
Note: This issue is similar to this ticket -> #609
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