Hi Cédric,
No, sorry, I still don’t have implemented the fix - it’s still in my todo.
I’m working on DBs right now but more on the PG plugin. I’ll try to provide you with a beta version of MySQL when I do release a beta version of the PG plugin - do not hesitate to ping me if it’s not done in the next 2 weeks.
BTW, I have tested deleting studies on an Orthanc instances with 100 millions images and that was quite responsive (note: it is using PG).
Best regards,
Alain.