Oops - after an update from 3.3.0.beta1-dev

Hi guys.
I’ve updated to the latest version - I think - and now I get the infamous ‘Ooops’
The only thing - while being an amateur - I could find, thinking it might be important, is:

URGENT: Failed to initialize site default: ActiveRecord::StatementInvalid PG::UndefinedTable: ERROR:  relation "flags" does not exist
LINE 10:  WHERE a.attrelid = '"flags"'::regclass

above is from unicorn.stderr.log
To a coder/devel that probably says something - would it be possible to “fix” this installation of mine?
All thoughts shared are much appreciated! Thanks.