Restore database with historic data after restoring from snapshot

Hi All
I transfered my home assistant from a rasp. pi SD card to an SSD drive. All worked fine incudinng the restore of the snapshop. Only thing I miss is access to historical data which I really try to access also in the future.
I transferred the database manually and homeassistant started a new db2 file and created a new file with my copied db2 file with a cryptic name. I hoped that homeassistant is going to update the database with the history but after 18 hours nothing happend.
Any ideas how to merge / update / reuse / access history of the database. Thanks a lot for your help!