I created the missing table "report" and added the columns "period" and "hour" as well as "keep_url_fragment" within table "site" (after group).
Now when I login I get:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'idsite' in 'from clause'
Now when I login I get:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'idsite' in 'from clause'