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The Automatic1111 branch of the image generation route called set_image_model whenever the request carried a model field. On this backend set_image_model is not request-scoped: it persists image_generation.model to the global configuration and posts the new sd_model_checkpoint to the shared server, because Automatic1111 holds a single checkpoint instance-wide. A non-admin holding features.image_generation could therefore change the instance-wide image model and the shared backend checkpoint for every user by sending a model on an ordinary generation request, even though the setting is otherwise managed only through the admin-only image configuration route and the frontend never sends this field. Gate the switch on an admin caller. A non-admin now generates on the currently configured checkpoint and the model field no longer mutates global state; admins retain per-request model switching here and through the image configuration route. Image editing is unaffected, as it selects its model per request without writing global configuration.