Some graphs use statistics. Those have a similar structure.
Check for metadata_id in the statistics_meta table
What date format is used? In my database is written “1738033922.7477977” as date format for last_updated How I can convert it into a normal date format?
Is this unix timestamp?
I found a converter
Most databases have time format conversion functions to make life easier. MySQL has from_unixtime().
In combination with a something like phpmyadmin, manual conversion of unixtime formatted times should not be necessary, and will reduce user error.