ALTER TABLE webdav_configs
  ADD COLUMN IF NOT EXISTS retention_state TEXT NOT NULL DEFAULT 'active';

ALTER TABLE webdav_configs
  DROP CONSTRAINT IF EXISTS webdav_configs_retention_state_check;

ALTER TABLE webdav_configs
  ADD CONSTRAINT webdav_configs_retention_state_check
  CHECK (retention_state IN ('active', 'deleting', 'deleted', 'error'));