Recover historical energy dashbaord data from corrupted mariadb

My Qnap NAS running hassio died last week and in the process the data of the hassio image seems to have gotten corrupted. I don’t have an SQL-dump of the database, I only manage to copy the
/mnt/data/supervisor/addons/data/core_mariadb folder. Thanks to the partial backups I have hassio up and running again on my new qnap. The only thing that is missing is my historical data. Besides “thoughts and prayers” are there any other steps that I can undertake, to recover my energy data?!

Thanks in advance