Move import to the top

Signed-off-by: Michal Čihař <michal@cihar.com>
Optimize MultipleFailingCheck SQL

Signed-off-by: Michal Čihař <michal@cihar.com>
Skip check flag updating for source checks

Signed-off-by: Michal Čihař <michal@cihar.com>
Prefetch usually needed attributes for related units

Signed-off-by: Michal Čihař <michal@cihar.com>
Mention changes

Signed-off-by: Michal Čihař <michal@cihar.com>