AppVersion gains sha256 and silentargs so the endpoint update_app push can pin exact installer bytes and carry per-version silent switches; Application gains installersha256 for the app-level install source. New ShopDB-hosted script library (Script model plus scripts API) backs run_script delivery, with the body fetched by digest on push rather than pre-staged or sent over the command wire. Two idempotent migrations with real downgrades. Script added to the shopdb.api contract surface for plugin use.
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