Ok, you warned me, but I will continue to use Calibre on my network disk.
I use the windows portable version only from my Windows desktop to add books. From my network and outside I use cobs
https://github.com/seblucas/cops to access my libraries.
The problem I've found is only a network map problem.
SQLite can works on network share.
Quote:
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"If you have many client programs accessing a common database over a network, you should consider using a client/server database engine instead of SQLite. SQLite will work over a network filesystem, but because of the latency associated with most network filesystems, performance will not be great. Also, the file locking logic of many network filesystems implementation contains bugs (on both Unix and Windows). If file locking does not work like it should, it might be possible for two or more client programs to modify the same part of the same database at the same time, resulting in database corruption. Because this problem results from bugs in the underlying filesystem implementation, there is nothing SQLite can do to prevent it."
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https://www.sqlite.org/whentouse.html
Samba should also provide all the same locking semantics that Windows clients expect. Can follow symbol links.
I'm not using it in a concurrency way. I don't wont to waste my local drive with this libraries. I use a portable version from a network drive instead of a USB storage.