With ENABLE_PERSISTENT_CONFIG=False the admin's model order is reset on every restart because ui.model_order_list falls back to its DEFAULT_CONFIG default, and unlike every other Models setting (DEFAULT_MODELS, DEFAULT_PINNED_MODELS, DEFAULT_MODEL_METADATA and DEFAULT_MODEL_PARAMS) that default was hardcoded to an empty list with no environment variable to source it from. This adds a MODEL_ORDER_LIST environment variable parsed as a JSON array using the same guarded pattern as the neighbouring DEFAULT_MODEL_METADATA and DEFAULT_MODEL_PARAMS defaults, falling back to an empty list on parse errors. Behaviour when the variable is unset is unchanged.
Fixes#27206
Classic298
50afbc5319