br: make table invisible to user during lightning/ restore execution

## Enhancement
During execution of restore&lightning, we need to mark corresponding table as invisible to avoid concurrent write operation from none br client.

Start by locating the restore and lightning execution entry points and the code that handles the corresponding table; no files or tests are named in the issue. Define how the table becomes invisible to non-BR clients during execution, then verify that concurrent writes are blocked and visibility is restored afterward.

Written by the indexing model from the issue text.