diff --git a/backend/scripts/init_schema.sql b/backend/scripts/init_schema.sql
index 5bbe825..3e4c524 100644
--- a/backend/scripts/init_schema.sql
+++ b/backend/scripts/init_schema.sql
@@ -7,6 +7,15 @@ BEGIN
   IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'record_status') THEN
     CREATE TYPE record_status AS ENUM ('active','inactive');
   END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'client_status') THEN
+    CREATE TYPE client_status AS ENUM ('active','inactive');
+  END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'scope_type') THEN
+    CREATE TYPE scope_type AS ENUM ('company','site');
+  END IF;
+  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'permission_action') THEN
+    CREATE TYPE permission_action AS ENUM ('view','create','update','delete','manage');
+  END IF;
 END
 $$;
 
@@ -22,6 +31,14 @@ CREATE TABLE IF NOT EXISTS users (
   updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
+CREATE TABLE IF NOT EXISTS auth_sync_state (
+  user_id UUID PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+  last_synced_at TIMESTAMPTZ,
+  source_version TEXT,
+  last_error TEXT,
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
 CREATE TABLE IF NOT EXISTS companies (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   company_key TEXT NOT NULL UNIQUE,
@@ -31,6 +48,16 @@ CREATE TABLE IF NOT EXISTS companies (
   updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
+CREATE TABLE IF NOT EXISTS sites (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  site_key TEXT NOT NULL UNIQUE,
+  company_id UUID NOT NULL REFERENCES companies(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  status record_status NOT NULL DEFAULT 'active',
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
 CREATE TABLE IF NOT EXISTS systems (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   system_key TEXT NOT NULL UNIQUE,
@@ -49,27 +76,19 @@ CREATE TABLE IF NOT EXISTS modules (
   updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
-CREATE TABLE IF NOT EXISTS sites (
+-- legacy table: 保留相容舊流程
+CREATE TABLE IF NOT EXISTS permissions (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-  site_key TEXT NOT NULL UNIQUE,
-  company_id UUID NOT NULL REFERENCES companies(id) ON DELETE CASCADE,
-  name TEXT NOT NULL,
-  status record_status NOT NULL DEFAULT 'active',
+  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  scope_type VARCHAR(32) NOT NULL,
+  scope_id VARCHAR(128) NOT NULL,
+  module VARCHAR(128) NOT NULL,
+  action VARCHAR(32) NOT NULL,
   created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
-  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+  CONSTRAINT uq_permissions_user_scope_module_action
+    UNIQUE (user_id, scope_type, scope_id, module, action)
 );
 
-DO $$
-BEGIN
-  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'scope_type') THEN
-    CREATE TYPE scope_type AS ENUM ('company','site');
-  END IF;
-  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'permission_action') THEN
-    CREATE TYPE permission_action AS ENUM ('view','create','update','delete','manage');
-  END IF;
-END
-$$;
-
 CREATE TABLE IF NOT EXISTS user_scope_permissions (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
@@ -90,14 +109,6 @@ ALTER TABLE user_scope_permissions
      OR (scope_type = 'site' AND site_id IS NOT NULL AND company_id IS NULL))
   );
 
-CREATE UNIQUE INDEX IF NOT EXISTS uq_usp_company
-ON user_scope_permissions(user_id, module_id, action, scope_type, company_id)
-WHERE scope_type = 'company';
-
-CREATE UNIQUE INDEX IF NOT EXISTS uq_usp_site
-ON user_scope_permissions(user_id, module_id, action, scope_type, site_id)
-WHERE scope_type = 'site';
-
 CREATE TABLE IF NOT EXISTS permission_groups (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   group_key TEXT NOT NULL UNIQUE,
@@ -123,17 +134,46 @@ CREATE TABLE IF NOT EXISTS permission_group_permissions (
   action TEXT NOT NULL,
   scope_type TEXT NOT NULL,
   scope_id TEXT NOT NULL,
-  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  CONSTRAINT uq_pgp_group_rule UNIQUE (group_id, system, module, action, scope_type, scope_id)
 );
 
-CREATE UNIQUE INDEX IF NOT EXISTS uq_pgp_group_rule
-ON permission_group_permissions(group_id, system, module, action, scope_type, scope_id);
+CREATE TABLE IF NOT EXISTS api_clients (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  client_key TEXT NOT NULL UNIQUE,
+  name TEXT NOT NULL,
+  status client_status NOT NULL DEFAULT 'active',
+  api_key_hash TEXT NOT NULL,
+  allowed_origins JSONB NOT NULL DEFAULT '[]'::jsonb,
+  allowed_ips JSONB NOT NULL DEFAULT '[]'::jsonb,
+  allowed_paths JSONB NOT NULL DEFAULT '[]'::jsonb,
+  rate_limit_per_min INTEGER,
+  expires_at TIMESTAMPTZ,
+  last_used_at TIMESTAMPTZ,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+INSERT INTO systems (system_key, name, status)
+VALUES ('member', 'Member Center', 'active')
+ON CONFLICT (system_key) DO NOTHING;
 
 CREATE INDEX IF NOT EXISTS idx_users_authentik_sub ON users(authentik_sub);
 CREATE INDEX IF NOT EXISTS idx_sites_company_id ON sites(company_id);
+CREATE INDEX IF NOT EXISTS idx_permissions_user_id ON permissions(user_id);
 CREATE INDEX IF NOT EXISTS idx_usp_user_id ON user_scope_permissions(user_id);
 CREATE INDEX IF NOT EXISTS idx_usp_module_id ON user_scope_permissions(module_id);
 CREATE INDEX IF NOT EXISTS idx_usp_company_id ON user_scope_permissions(company_id);
 CREATE INDEX IF NOT EXISTS idx_usp_site_id ON user_scope_permissions(site_id);
+CREATE UNIQUE INDEX IF NOT EXISTS uq_usp_company
+  ON user_scope_permissions(user_id, module_id, action, scope_type, company_id)
+  WHERE scope_type = 'company';
+CREATE UNIQUE INDEX IF NOT EXISTS uq_usp_site
+  ON user_scope_permissions(user_id, module_id, action, scope_type, site_id)
+  WHERE scope_type = 'site';
+CREATE INDEX IF NOT EXISTS idx_api_clients_status ON api_clients(status);
+CREATE INDEX IF NOT EXISTS idx_api_clients_expires_at ON api_clients(expires_at);
+CREATE INDEX IF NOT EXISTS idx_systems_system_key ON systems(system_key);
+CREATE INDEX IF NOT EXISTS idx_modules_module_key ON modules(module_key);
 
 COMMIT;
diff --git a/docs/API_CLIENTS_SQL.sql b/docs/API_CLIENTS_SQL.sql
deleted file mode 100644
index e91281e..0000000
--- a/docs/API_CLIENTS_SQL.sql
+++ /dev/null
@@ -1,106 +0,0 @@
--- member_center: API 呼叫方白名單表
--- 位置: public schema
-
-BEGIN;
-
-CREATE EXTENSION IF NOT EXISTS pgcrypto;
-
-DO $$
-BEGIN
-  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'client_status') THEN
-    CREATE TYPE client_status AS ENUM ('active', 'inactive');
-  END IF;
-END $$;
-
-CREATE TABLE IF NOT EXISTS api_clients (
-  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-  client_key TEXT NOT NULL UNIQUE,
-  name TEXT NOT NULL,
-  status client_status NOT NULL DEFAULT 'active',
-
-  -- 只存 hash，不存明文 key
-  api_key_hash TEXT NOT NULL,
-
-  -- 可先留空，之後再嚴格化
-  allowed_origins JSONB NOT NULL DEFAULT '[]'::jsonb,
-  allowed_ips JSONB NOT NULL DEFAULT '[]'::jsonb,
-  allowed_paths JSONB NOT NULL DEFAULT '[]'::jsonb,
-
-  rate_limit_per_min INTEGER,
-  expires_at TIMESTAMPTZ,
-  last_used_at TIMESTAMPTZ,
-
-  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
-  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
-);
-
-CREATE INDEX IF NOT EXISTS idx_api_clients_status ON api_clients(status);
-CREATE INDEX IF NOT EXISTS idx_api_clients_expires_at ON api_clients(expires_at);
-
-CREATE OR REPLACE FUNCTION set_updated_at_api_clients()
-RETURNS TRIGGER AS $$
-BEGIN
-  NEW.updated_at = NOW();
-  RETURN NEW;
-END;
-$$ LANGUAGE plpgsql;
-
-DO $$
-BEGIN
-  IF NOT EXISTS (
-    SELECT 1 FROM pg_trigger WHERE tgname = 'trg_api_clients_set_updated_at'
-  ) THEN
-    CREATE TRIGGER trg_api_clients_set_updated_at
-    BEFORE UPDATE ON api_clients
-    FOR EACH ROW EXECUTE FUNCTION set_updated_at_api_clients();
-  END IF;
-END $$;
-
--- 建議初始化 2~3 個 client（api_key_hash 先放占位，後續再更新）
-INSERT INTO api_clients (
-  client_key,
-  name,
-  status,
-  api_key_hash,
-  allowed_origins,
-  allowed_ips,
-  allowed_paths,
-  rate_limit_per_min
-)
-VALUES
-  (
-    'mkt-backend',
-    'MKT Backend Service',
-    'active',
-    'REPLACE_WITH_BCRYPT_OR_ARGON2_HASH',
-    '[]'::jsonb,
-    '[]'::jsonb,
-    '["/internal/users/upsert-by-sub", "/internal/permissions"]'::jsonb,
-    600
-  ),
-  (
-    'admin-frontend',
-    'Admin Frontend',
-    'active',
-    'REPLACE_WITH_BCRYPT_OR_ARGON2_HASH',
-    '["https://admin.ose.tw", "https://member.ose.tw"]'::jsonb,
-    '[]'::jsonb,
-    '["/admin"]'::jsonb,
-    300
-  ),
-  (
-    'ops-local',
-    'Ops Local Tooling',
-    'inactive',
-    'REPLACE_WITH_BCRYPT_OR_ARGON2_HASH',
-    '[]'::jsonb,
-    '["127.0.0.1"]'::jsonb,
-    '["/internal", "/admin"]'::jsonb,
-    120
-  )
-ON CONFLICT (client_key) DO NOTHING;
-
-COMMIT;
-
--- 快速檢查
--- SELECT client_key, status, expires_at, created_at FROM api_clients ORDER BY client_key;
diff --git a/docs/ARCHITECTURE_AND_CONFIG.md b/docs/ARCHITECTURE_AND_CONFIG.md
index 56b05a9..8b33509 100644
--- a/docs/ARCHITECTURE_AND_CONFIG.md
+++ b/docs/ARCHITECTURE_AND_CONFIG.md
@@ -23,8 +23,8 @@
   - 前端任務進度與驗收條件
 - `docs/TASKPLAN_BACKEND.md`
   - 後端任務進度與驗收條件
-- `docs/API_CLIENTS_SQL.sql`
-  - `api_clients` 白名單表與初始資料 SQL
+- `backend/scripts/init_schema.sql`
+  - 一次建立完整 schema（含 `api_clients`）
 - `docs/DB_SCHEMA_SNAPSHOT.md`
   - 目前資料庫 schema 快照（欄位/索引/約束）
 
diff --git a/docs/BACKEND_BOOTSTRAP.md b/docs/BACKEND_BOOTSTRAP.md
index 0863bc4..97c267d 100644
--- a/docs/BACKEND_BOOTSTRAP.md
+++ b/docs/BACKEND_BOOTSTRAP.md
@@ -10,9 +10,9 @@ cp .env.example .env
 ```
 
 ## 2. 建立資料表
-1. 先執行 `member.ose.tw/docs/API_CLIENTS_SQL.sql`
-2. 再執行 `member.ose.tw/backend/scripts/init_schema.sql`
-3. 若是舊資料庫，補跑 `member.ose.tw/backend/scripts/migrate_add_authentik_user_id.sql`
+1. 先執行 `member.ose.tw/backend/scripts/init_schema.sql`（已含 `api_clients`）
+2. 若是舊資料庫，補跑 `member.ose.tw/backend/scripts/migrate_align_company_site_member_system.sql`
+3. 若是更舊資料庫，再補 `member.ose.tw/backend/scripts/migrate_add_authentik_user_id.sql`
 
 ## 3. 啟動服務
 ```bash
diff --git a/docs/index.md b/docs/index.md
index 78d97a9..f3355ee 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -16,7 +16,7 @@
 - `docs/ORG_MEMBER_MANAGEMENT_PLAN.md`（公司組織/會員管理規劃）
 
 ## SQL 與配置
-- `docs/API_CLIENTS_SQL.sql`
+- `backend/scripts/init_schema.sql`
 - `docs/DB_SCHEMA_SNAPSHOT.md`
 
 ## 給前端 AI 的一句話交接