From AccountHistoryChunks we can compose a MultiAccountView. It's not necessarily only history, might also include future.
the chunks merge if they overlap and are about the same account
The MultiAccountView should be able to list all accounts for which at least one Arrival or Departure exists in a given time period, and list the mutations for a given account + period.
From AccountHistoryChunks we can compose a MultiAccountView. It's not necessarily only history, might also include future.