feat(db): 增加共享知识库与隔离系统数据库初始化脚本

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/postgres/system_init.sql

@@ -0,0 +1,72 @@
+-- 各环境专属系统数据库 (System App DB) 初始化脚本
+-- 注意：对话记录、系统用户、执行任务状态等在各环境之间严格物理/逻辑隔离
+
+CREATE TABLE IF NOT EXISTS schema_migrations (
+    version INTEGER PRIMARY KEY,
+    applied_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+-- 系统租户/项目
+CREATE TABLE IF NOT EXISTS projects (
+    id BIGSERIAL PRIMARY KEY,
+    name TEXT NOT NULL,
+    code TEXT NOT NULL UNIQUE,
+    environment TEXT NOT NULL DEFAULT 'dev',
+    status TEXT NOT NULL DEFAULT 'active',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+-- 用户表 (隔离)
+CREATE TABLE IF NOT EXISTS users (
+    id BIGSERIAL PRIMARY KEY,
+    account_id TEXT NOT NULL UNIQUE,
+    name TEXT NOT NULL DEFAULT '',
+    role TEXT NOT NULL DEFAULT 'user',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+-- 对话会话表 (隔离：各环境不得共享)
+CREATE TABLE IF NOT EXISTS chat_sessions (
+    id BIGSERIAL PRIMARY KEY,
+    session_id TEXT NOT NULL UNIQUE,
+    project_id BIGINT REFERENCES projects(id) ON DELETE CASCADE,
+    user_id BIGINT REFERENCES users(id),
+    title TEXT NOT NULL DEFAULT '新对话',
+    model TEXT NOT NULL DEFAULT '',
+    status TEXT NOT NULL DEFAULT 'active',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_chat_sessions_uid ON chat_sessions(user_id);
+CREATE INDEX IF NOT EXISTS idx_chat_sessions_pid ON chat_sessions(project_id);
+
+-- 对话消息与历史流 (隔离：各环境不得共享)
+CREATE TABLE IF NOT EXISTS chat_messages (
+    id BIGSERIAL PRIMARY KEY,
+    session_id TEXT NOT NULL REFERENCES chat_sessions(session_id) ON DELETE CASCADE,
+    role TEXT NOT NULL, -- user / assistant / system / tool
+    content TEXT NOT NULL,
+    tool_calls JSONB,
+    tokens INT NOT NULL DEFAULT 0,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_chat_messages_sid ON chat_messages(session_id);
+
+-- 智能体异步执行任务与审计日志 (隔离)
+CREATE TABLE IF NOT EXISTS agent_tasks (
+    id BIGSERIAL PRIMARY KEY,
+    task_id TEXT NOT NULL UNIQUE,
+    session_id TEXT REFERENCES chat_sessions(session_id),
+    status TEXT NOT NULL DEFAULT 'pending', -- pending, running, completed, failed
+    plan_steps JSONB NOT NULL DEFAULT '[]'::jsonb,
+    result_summary TEXT NOT NULL DEFAULT '',
+    error_message TEXT NOT NULL DEFAULT '',
+    started_at TIMESTAMPTZ,
+    finished_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_agent_tasks_status ON agent_tasks(status);