ALTER TABLE schedule_tasks
    DROP CONSTRAINT IF EXISTS chk_schedule_tasks_cover_random_folder_id,
    DROP CONSTRAINT IF EXISTS chk_schedule_tasks_cover_random_scope,
    DROP CONSTRAINT IF EXISTS chk_schedule_tasks_cover_mode;

ALTER TABLE schedule_tasks
    DROP COLUMN IF EXISTS cover_random_folder_id,
    DROP COLUMN IF EXISTS cover_random_scope,
    DROP COLUMN IF EXISTS cover_mode;