-- 切换到目标数据库
\c postgres;

CREATE OR REPLACE FUNCTION update_user_modified_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql VOLATILE;

DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'user') THEN
        CREATE TABLE "user" (  -- user是关键字，用双引号包裹
            id UUID DEFAULT gen_random_uuid_v7() PRIMARY KEY NOT NULL,
            deleted BOOLEAN NOT NULL DEFAULT FALSE,
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
        );
        CREATE TRIGGER update_user_updated_at
        BEFORE UPDATE ON "user"
        FOR EACH ROW
        EXECUTE FUNCTION update_user_modified_column();
        
        RAISE NOTICE 'Created user table and trigger';
    ELSE
        RAISE NOTICE 'user table already exists';
    END IF;
END $$;