text: 
  -- !Ups
  ALTER TABLE channels ADD COLUMN closing_type TEXT NULL;
  ALTER TABLE channels ADD COLUMN closed_by TEXT NULL;
  ALTER TABLE channels ADD COLUMN closed_on TIMESTAMPTZ NULL;
  
  -- !Downs
  ALTER TABLE channels DROP COLUMN closing_type;
  ALTER TABLE channels DROP COLUMN closed_by;
  ALTER TABLE channels DROP COLUMN closed_on;
  