-- =============================================================================
-- Vignette · migration 23 — 관리자 감정 관측용 Jev 전이 trace
-- =============================================================================
-- 기존 turns/session_state 행은 수정하지 않는다. trace는 성공한 client 턴에만
-- 연결되며, 앱 런타임은 client turn INSERT와 state UPSERT를 같은 트랜잭션에 둔다.

CREATE TABLE IF NOT EXISTS app.client_affect_trace (
  turn_id UUID PRIMARY KEY REFERENCES app.turns(id) ON DELETE CASCADE,
  session_id UUID NOT NULL REFERENCES app.sessions(id) ON DELETE CASCADE,
  trace JSONB NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_client_affect_trace_session_created
  ON app.client_affect_trace (session_id, created_at DESC);

ALTER TABLE app.client_affect_trace ENABLE ROW LEVEL SECURITY;

DROP POLICY IF EXISTS p_client_affect_trace_select_admin ON app.client_affect_trace;
DROP POLICY IF EXISTS p_client_affect_trace_insert_learner ON app.client_affect_trace;

CREATE POLICY p_client_affect_trace_select_admin
  ON app.client_affect_trace FOR SELECT
  USING (app.current_role_name() = 'admin');

CREATE POLICY p_client_affect_trace_insert_learner
  ON app.client_affect_trace FOR INSERT
  WITH CHECK (
    app.current_role_name() = 'learner'
    AND EXISTS (
      SELECT 1
      FROM app.turns AS turn_row
      JOIN app.sessions AS session_row ON session_row.id = turn_row.session_id
      WHERE turn_row.id = app.client_affect_trace.turn_id
        AND turn_row.session_id = app.client_affect_trace.session_id
        AND turn_row.speaker = 'client'
        AND session_row.learner_id = app.current_uid()
    )
  );