While many people are downloading and creating mirrors, I will post a couple of screenshots so that you understand what format the data is inside.
Each year is divided by month:
Each month is divided by accounts (room / nickname and some numbers - given that they go in ascending order, this could be the bot version and account number in the system):
Each month is divided by sessions:
Each sesion has 2 screenshots (start and end):
Session start:
Session end: