Allow to repair the WAL based on the error returned by a reader
during a full scan over all records.
Signed-off-by: Fabian Reinartz <freinartz@google.com>
This adds a new WAL that's agnostic to the actual record contents.
It's much simpler and should be more resilient than the existing one.
Signed-off-by: Fabian Reinartz <freinartz@google.com>