Something wrong with tag editing
I'm currently adding new users that worked on a train collab and I noticed that whenever I tried to save the edits to a tag it keeps throwing the 500 Internal Error at me. Now it does seem to save most changes either way, but when trying to add/change Connection links, it keeps being very wonky with it. On one try, the links update just fine, but then there has also been like two times in a row that they didn't get saved and I had to spam the process until it did. And after a bit of testing, it seems like Wiki page edits and new aliases get saved like normal, so this error seems to primarily affect the Connections.
There's a fix prepared for this now, just is pending review. https://github.com/otoDB/otoDB/pull/897
What specifically provokes the bug is any URL that being redirected to containing characters that normally require encoding, which is common for a lot of tags. In your case it would be when trying to edit creator tags like this one, which upon submitting edits, triggers the redirect bug: https://otodb.net/tag/なんとかなるなる/edit
Fixed deployed now! Thank you for the report!