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-68.sql
drop index IndexBuildsOnJobsetIdFinishedId;
create index IndexBuildsOnJobsetIdFinishedId on Builds(jobset_id, job, finished, id DESC);

drop index IndexFinishedSuccessfulBuilds;
create index IndexFinishedSuccessfulBuilds on Builds(jobset_id, job, finished, buildstatus, id DESC) where buildstatus = 0 and finished = 1;