Prior to the start of migration, the owner of WBstack needs to either:

1. Set a single point at which all wikis/accounts on Wbstack.com will become read only
2. Break the accounts interested in migration into batches and set freeze points for each

The reason for this is that we need to ensure data is not changing while migration is taking place, and also we would like to communicate to affected users the likely timeframe during which their wikis will be read only.

It may be that there is no simple way to set multiple freeze points, therefore we will defer to the WBstack owner as to the approach he wishes to take.