Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/154_account_spark_shadow.sql

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+-- 154_account_spark_shadow.sql
+ALTER TABLE accounts
+    ADD COLUMN IF NOT EXISTS parent_account_id BIGINT,
+    ADD COLUMN IF NOT EXISTS quota_dimension VARCHAR(20) NOT NULL DEFAULT 'global';
+
+-- 幂等加约束:维度合法 + 禁自指 + parent⟺非global 维度一致(评审 P1-d)
+DO $$ BEGIN
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chk_accounts_quota_dimension') THEN
+    ALTER TABLE accounts ADD CONSTRAINT chk_accounts_quota_dimension
+      CHECK (quota_dimension IN ('global','spark')) NOT VALID;
+  END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chk_accounts_parent_dimension') THEN
+    ALTER TABLE accounts ADD CONSTRAINT chk_accounts_parent_dimension
+      CHECK ((parent_account_id IS NULL AND quota_dimension = 'global')
+          OR (parent_account_id IS NOT NULL AND quota_dimension <> 'global')) NOT VALID;
+  END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chk_accounts_parent_not_self') THEN
+    ALTER TABLE accounts ADD CONSTRAINT chk_accounts_parent_not_self
+      CHECK (parent_account_id IS NULL OR parent_account_id <> id) NOT VALID;
+  END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'fk_accounts_parent_account_id') THEN
+    ALTER TABLE accounts ADD CONSTRAINT fk_accounts_parent_account_id
+      FOREIGN KEY (parent_account_id) REFERENCES accounts(id) ON DELETE RESTRICT NOT VALID;
+  END IF;
+END $$;
+
+ALTER TABLE accounts VALIDATE CONSTRAINT chk_accounts_quota_dimension;
+ALTER TABLE accounts VALIDATE CONSTRAINT chk_accounts_parent_dimension;
+ALTER TABLE accounts VALIDATE CONSTRAINT chk_accounts_parent_not_self;
+ALTER TABLE accounts VALIDATE CONSTRAINT fk_accounts_parent_account_id;