ALTER TABLE mail_preferences ADD COLUMN sync_imap_keywords INTEGER NOT NULL DEFAULT 0;
ALTER TABLE tags ADD COLUMN imap_keyword TEXT NOT NULL DEFAULT '';
UPDATE tags SET imap_keyword = 'RustBox-' || replace(id, '-', '') WHERE imap_keyword = '';
CREATE UNIQUE INDEX IF NOT EXISTS idx_tags_imap_keyword ON tags(imap_keyword) WHERE imap_keyword <> '';