-- Marks a mod_id as an "optional add-on" within a multi-mod wsid, signaled
-- by `Optional add-on` (or close variants) at the head of the mod.info
-- description. Spec A's branch picker treats addon mods additively
-- (default-off, tickable to load alongside the primary) instead of as a
-- mutually-exclusive flavor variant.
ALTER TABLE mod_parsed
    ADD COLUMN IF NOT EXISTS is_addon BOOLEAN NOT NULL DEFAULT FALSE;