Rethink the --x-full-verification flag usability and implementation

[glevco]

The --x-full-verification flag may be too slow for practical uses, and we could explore alternative implementations.

This would also remove duplicate code from the code base as discussed in the thread below:

Originally posted by @jansegre in #534 (comment)

[jansegre]

Yes. I think we should either re-implement it with a different approach or remove it in favor of a separate subcommand to restore a database.

[glevco]

or remove it in favor of a separate subcommand to restore a database.

I lean more towards this.