Resetting and Retraining Face Recognition Database

I have been using DigiKam for a long time and especially the face recognition feature, which has improved with each release. According to the press, it now achieves a recognition rate of 97%. I am currently using version 8.3.0 on Linux.

What is my concern?

There are “faces” that are reliably recognized and assigned to a person, which I can then confirm all at once. However, there are also “faces” that are incorrectly assigned to a person. I have the impression that for some individuals there is a good basis provided by the “Deep Learning Engine,” while for others, this is not the case.

I would like to reset the database (I have read that this can be done by deleting the “recognition.db”) and then retrain it based on 500 people with 10-200 images each.

Is this possible? If so, how do I proceed?

Thank you in advance for your help!