implement SQL request to check if there is content to upload in an unchanged directory

Description

Fix file ignored because of previous failure or incomplete synchronization while directory didn't change since.

Issue(s)

https://gitlab.e.foundation/e/os/backlog/-/issues/687

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation