-- Ask threads & messages (AI 成长助手)

CREATE TABLE IF NOT EXISTS ask_threads (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id),
  profile_id uuid NOT NULL REFERENCES profiles(id),
  scene varchar(32) NULL,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  deleted_at timestamptz NULL
);
CREATE INDEX IF NOT EXISTS idx_ask_threads_user_id ON ask_threads(user_id);
CREATE INDEX IF NOT EXISTS idx_ask_threads_profile_id ON ask_threads(profile_id);

CREATE TABLE IF NOT EXISTS ask_messages (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  thread_id uuid NOT NULL REFERENCES ask_threads(id),
  role varchar(16) NOT NULL CHECK (role IN ('user', 'assistant')),
  content text NOT NULL,
  created_at timestamptz NOT NULL DEFAULT now(),
  deleted_at timestamptz NULL
);
CREATE INDEX IF NOT EXISTS idx_ask_messages_thread_id ON ask_messages(thread_id);