The function to restore a backup has been added. The "pending" backups are now deleted after the restore.
A backup is also created before a restore, but it is also deleted after the restore. When restoring, the existing database is overwritten by the backup.
CSS adjustments were made to eliminate errors in darkmode and lightmode.
Added the possibility to perform a backup of the database. This creates a "pending" backup (a copy of the database) and from it an archive with the current date. The "pending" backup is overwritten with the next backup. The status information on the maintenance page has been supplemented accordingly.
