Now i am trying to restore contacts in a usable way. I have the .db file but I am not able to extract name+number in vcf format. I am not able to use SQLite. i tried to copy it in privileged folder, then to make a backup from setting but it seems to backup only a part of contacts visualized in people, and most of them are facebook contact without any number associated.
it is possible to filter results from people?
if not, could someone kindly explain why it doesn't export all contact shown in people app?
someone could help me to extract them with SQLite or other tools?

I cannot even select more than one contact per time for deleting them in people.

thanks