refactor(intelligent-eval): reduce nesting complexity in supplement_decision_logs

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:
+            added += _supplement_executing(ev, sessions, completed, estimated, types, session)
-                _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
         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
+            added += _supplement_completed(ev, sessions, completed, estimated, plan, types, 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
     return added