[Bug]: Client fails to handle 'book already exists' state

[paulcsiki]

Description of the bug

Trying to upload 20 ebooks and the client seems to have gotten into a stalemate situation where it tries to upload the books, the server reports that the books are already present but the client retries.
librum_log.txt

This is connecting to a self-hosted server running maria db as the persistence layer. Here are the error logs on the server side.
librum-app.log

Environment: Hosted with Kubernetes, fronted by Traefik as a reverse proxy.
Client Version: 0.12.2
Server Commit Hash: 2a2d21f62486e0414bf408781d809fa4923dafcb

Steps To Reproduce

Not exactly clear as all I have done was press the "Add books" button and the selected the books and moved them to a folder.

Additional Information

No response