Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

upgrade-20.sql
create table CachedDarcsInputs (
    uri           text not null,
    revision      text not null,
    sha256hash    text not null,
    storePath     text not null,
    revCount      integer not null,
    primary key   (uri, revision)
);