sub2api-cn-relay-manager/backend/migrations/085_channel_restrict_and_per_request_price.sql

-- Add model restriction switch to channels
ALTER TABLE channels ADD COLUMN IF NOT EXISTS restrict_models BOOLEAN DEFAULT false;

-- Add default per_request_price to channel_model_pricing (fallback when no tier matches)
ALTER TABLE channel_model_pricing ADD COLUMN IF NOT EXISTS per_request_price NUMERIC(20,10);