style: fix ruff whitespace warnings

Extract helper functions _supplement_executing and _supplement_completed
to flatten the nested conditional logic. This improves readability and
makes the code easier to test and maintain.

Addresses code review finding: supplement_decision_logs nested complexity

backend/agenteval/intelligent_eval/decision_logs.py

@@ -130,6 +130,92 @@ def list_decision_logs(eval_id: str, session: Session) -> list[dict]:
     return [_log_to_dict(log) for log in logs]
 
 
+def _supplement_executing(
+    ev: IntelligentEvalDB,
+    sessions: list,
+    completed: int,
+    estimated: int,
+    types: set[str],
+    session: Session,
+) -> int:
+    """Supplement decision logs for EXECUTING evals."""
+    added = 0
+    if "execute_session" not in types and completed < estimated:
+        _append_row(
+            ev.id,
+            "execute_session",
+            "平台兜底：时段欠账需执行会话",
+            "platform",
+            {"platform_supplemented": True, "completed": completed, "estimated": estimated},
+            session,
+        )
+        added += 1
+    elif "start_analysis" not in types and sessions and completed >= estimated:
+        _append_row(
+            ev.id,
+            "start_analysis",
+            "平台兜底：所有会话已完成开始分析",
+            "platform",
+            {"platform_supplemented": True, "completed": completed, "estimated": estimated},
+            session,
+        )
+        added += 1
+    return added
+
+
+def _supplement_completed(
+    ev: IntelligentEvalDB,
+    sessions: list,
+    completed: int,
+    estimated: int,
+    plan: dict,
+    types: set[str],
+    session: Session,
+) -> int:
+    """Supplement decision logs for COMPLETED evals (historical backfill)."""
+    added = 0
+    if "execute_session" not in types:
+        slots = plan.get("time_distribution") or []
+        if slots:
+            for slot in slots:
+                _append_row(
+                    ev.id,
+                    "execute_session",
+                    f"平台兜底：时段{slot.get('time_slot', '')}执行会话（历史回填）",
+                    "platform",
+                    {
+                        "platform_supplemented": True,
+                        "time_slot": slot.get("time_slot"),
+                        "sessions": slot.get("sessions"),
+                        "completed": completed,
+                        "estimated": estimated,
+                    },
+                    session,
+                )
+                added += 1
+        else:
+            _append_row(
+                ev.id,
+                "execute_session",
+                "平台兜底：执行会话（历史回填）",
+                "platform",
+                {"platform_supplemented": True, "completed": completed, "estimated": estimated},
+                session,
+            )
+            added += 1
+    if "start_analysis" not in types and sessions:
+        _append_row(
+            ev.id,
+            "start_analysis",
+            "平台兜底：所有会话已完成开始分析（历史回填）",
+            "platform",
+            {"platform_supplemented": True, "completed": completed, "estimated": estimated},
+            session,
+        )
+        added += 1
+    return added
+
+
 def supplement_decision_logs(session: Session) -> int:
     """Platform audit backfill for decision logs.
 
@@ -162,7 +248,9 @@ def supplement_decision_logs(session: Session) -> int:
     for ev in evals:
         plan = ev.get_plan() if ev.plan else {}
         estimated = plan.get("estimated_sessions", 0)
-        sessions = session.exec(select(IntelligentEvalSessionDB).where(IntelligentEvalSessionDB.eval_id == ev.id)).all()
+        sessions = session.exec(
+            select(IntelligentEvalSessionDB).where(IntelligentEvalSessionDB.eval_id == ev.id)
+        ).all()
         completed = sum(1 for s in sessions if s.status == "completed")
         types = {
             x.decision_type
@@ -170,66 +258,10 @@ def supplement_decision_logs(session: Session) -> int:
                 select(IntelligentEvalDecisionLogDB).where(IntelligentEvalDecisionLogDB.eval_id == ev.id)
             ).all()
         }
+
         if ev.status == IntelligentEvalStatus.EXECUTING.value:
-            if "execute_session" not in types and completed < estimated:
-                _append_row(
-                    ev.id,
-                    "execute_session",
-                    "平台兜底：时段欠账需执行会话",
-                    "platform",
-                    {"platform_supplemented": True, "completed": completed, "estimated": estimated},
-                    session,
-                )
-                added += 1
-            elif "start_analysis" not in types and sessions and completed >= estimated:
-                _append_row(
-                    ev.id,
-                    "start_analysis",
-                    "平台兜底：所有会话已完成开始分析",
-                    "platform",
-                    {"platform_supplemented": True, "completed": completed, "estimated": estimated},
-                    session,
-                )
-                added += 1
+            added += _supplement_executing(ev, sessions, completed, estimated, types, session)
         elif ev.status == IntelligentEvalStatus.COMPLETED.value:
-            # 历史回填：completed 评估决策日志全缺失时，按时段补 execute_session
-            if "execute_session" not in types:
-                slots = plan.get("time_distribution") or []
-                if slots:
-                    for slot in slots:
-                        _append_row(
-                            ev.id,
-                            "execute_session",
-                            f"平台兜底：时段{slot.get('time_slot', '')}执行会话（历史回填）",
-                            "platform",
-                            {
-                                "platform_supplemented": True,
-                                "time_slot": slot.get("time_slot"),
-                                "sessions": slot.get("sessions"),
-                                "completed": completed,
-                                "estimated": estimated,
-                            },
-                            session,
-                        )
-                        added += 1
-                else:
-                    _append_row(
-                        ev.id,
-                        "execute_session",
-                        "平台兜底：执行会话（历史回填）",
-                        "platform",
-                        {"platform_supplemented": True, "completed": completed, "estimated": estimated},
-                        session,
-                    )
-                    added += 1
-            if "start_analysis" not in types and sessions:
-                _append_row(
-                    ev.id,
-                    "start_analysis",
-                    "平台兜底：所有会话已完成开始分析（历史回填）",
-                    "platform",
-                    {"platform_supplemented": True, "completed": completed, "estimated": estimated},
-                    session,
-                )
-                added += 1
+            added += _supplement_completed(ev, sessions, completed, estimated, plan, types, session)
+
     return added

backend/agenteval/intelligent_eval/lifecycle.py

@@ -226,8 +226,8 @@ def submit_report(session: Session, eval_id: str, report: dict[str, Any]) -> Int
     （不完整证据），不再阻塞报告提交。
     """
     repo = IntelligentEvalRepository(session)
-    sessions = IntelligentEvalSessionRepository(session).list_by_eval(eval_id)
-    if any(s.status == IntelligentEvalSessionStatus.RUNNING for s in sessions):
+    eval_sessions = IntelligentEvalSessionRepository(session).list_by_eval(eval_id)
+    if any(s.status == IntelligentEvalSessionStatus.RUNNING for s in eval_sessions):
         raise IntelligentEvalTransitionError("存在进行中的会话，不能提交报告")
     # ADR-0011：submit 边界把 scores 归一到 {overall, dimensions} 单一规范结构
     if report.get("scores"):
@@ -432,29 +432,36 @@ def expire_stale_running_sessions(session: Session) -> int:
     now = utc_now()
     # SQLite 读出为 naive datetime，阈值须同为 naive 才能在 Python 侧比较
     threshold = now.replace(tzinfo=None) - timedelta(minutes=SESSION_IDLE_EXPIRE_MINUTES)
-    rows = session.exec(
-        select(IntelligentEvalSessionDB).where(IntelligentEvalSessionDB.status == "running")
-    ).all()
+
+    # 单次查询获取所有 running 会话及其最后消息时间（避免 N+1 查询）
+    stmt = (
+        select(
+            IntelligentEvalSessionDB,
+            func.max(IntelligentEvalMessageDB.created_at).label("last_message_at"),
+        )
+        .outerjoin(
+            IntelligentEvalMessageDB,
+            IntelligentEvalMessageDB.session_id == IntelligentEvalSessionDB.id,
+        )
+        .where(IntelligentEvalSessionDB.status == "running")
+        .group_by(IntelligentEvalSessionDB.id)
+    )
+    rows = session.exec(stmt).all()
 
     expired = 0
-    for row in rows:
-        last_message_at = session.exec(
-            select(func.max(IntelligentEvalMessageDB.created_at)).where(
-                IntelligentEvalMessageDB.session_id == row.id
-            )
-        ).one()
-        last_activity = last_message_at or row.created_at
+    for session_row, last_message_at in rows:
+        last_activity = last_message_at or session_row.created_at
         if last_activity is None or last_activity >= threshold:
             continue
-        row.status = IntelligentEvalSessionStatus.EXPIRED.value
-        row.closed_at = now
+        session_row.status = IntelligentEvalSessionStatus.EXPIRED.value
+        session_row.closed_at = now
         expired += 1
         append_decision_log(
-            row.eval_id,
+            session_row.eval_id,
             "session_expired",
             f"平台兜底：会话 {SESSION_IDLE_EXPIRE_MINUTES} 分钟无新轮次，置为过期（不完整证据）",
             "platform",
-            {"platform_supplemented": True, "session_id": row.id, "turn_count": row.turn_count},
+            {"platform_supplemented": True, "session_id": session_row.id, "turn_count": session_row.turn_count},
             session,
         )
 
@@ -674,16 +681,16 @@ def evals_needing_analyst_nudge(session: Session) -> list[str]:
 
     needing: list[str] = []
     for row in executing:
-        sessions = session.exec(
+        eval_sessions = session.exec(
             select(IntelligentEvalSessionDB).where(IntelligentEvalSessionDB.eval_id == row.id)
         ).all()
-        if not sessions or any(s.status not in _TERMINAL_SESSION_STATUSES for s in sessions):
+        if not eval_sessions or any(s.status not in _TERMINAL_SESSION_STATUSES for s in eval_sessions):
             continue
         # 冒烟教训：窗口未结束且会话数未达计划时，未来时段到期后还要建会话，
         # 此时催促 analyst 会让报告提前收敛（漏掉后续时段的证据）
-        if _window_has_pending_future_slots(row, sessions, now):
+        if _window_has_pending_future_slots(row, eval_sessions, now):
             continue
-        closed_moments = [s.closed_at for s in sessions if s.closed_at is not None]
+        closed_moments = [s.closed_at for s in eval_sessions if s.closed_at is not None]
         if not closed_moments:
             continue
         last_closed = max(closed_moments)