-- §22.12 S6 — per-collection model universe.
--
-- A collection's `.collection.yaml` may carry an `enabled_models` list that
-- NARROWS its project's universe (which narrows the deployment ENABLED_MODELS).
-- Mirrored into a `config_json` blob on the collection row, paralleling
-- `projects.config_json` (which already holds the project's enabled_models +
-- theme). Additive only — no rebuild. NULL means "no per-collection narrowing;
-- inherit the project's universe."
ALTER TABLE collections ADD COLUMN config_json TEXT;