cubicweb #1972842 db-check autofix may destroy data [resolved]

Some parts of db-check when run with --autofix, will brutaly delete stuff to obtain consistency, thus destroying data.

1/ improve messages to warn the user about the action autofix will take 2/ try not to destroy data

prioritynormal
typebug
done in3.14.0
load0.300
load left0.000
closed by#d45c0eb39e72 [server] fix integrity checks that destroy data (closes #1972842)