-- 20260331000001_accounts_llm_routing.sql
-- 账号级 LLM 路由模式: relay=SaaS中转(Token池), local=本地直连
ALTER TABLE accounts ADD COLUMN IF NOT EXISTS llm_routing TEXT NOT NULL DEFAULT 'local'
  CHECK (llm_routing IN ('relay', 'local'));

COMMENT ON COLUMN accounts.llm_routing IS 'LLM路由模式: relay=SaaS中转, local=本地直连';