fix(data): 自动归集空汇总不写0 + Excel导入示例文件防线 (DAMA审计20260906代码类)

backend/scripts/kpi_value_collector.py

@@ -123,7 +123,10 @@ def collect_for_mapping(db, mapping: KPIValueSource, period: str, write_kpi: boo
         q = q.filter(model.carry_forward == 0)
 
     value = q.scalar()
-    value = float(value or 0)
+    if value is None:
+        # 源表无记录 → 不写 0，交由 run_collector 记 skipped，避免污染 KPI 实际值
+        return None, "源表无记录"
+    value = float(value)
     value = round(value * unit, 2)
 
     message = f"表{table}.{field} {aggregate}(period={period}) × {unit}"
@@ -185,6 +188,18 @@ def run_collector(db, entity_id: Optional[int] = None, period: Optional[str] = N
     for m in mappings:
         try:
             value, message = collect_for_mapping(db, m, period, write_kpi=True)
+            if value is None:
+                # 源表无记录 → 跳过，不落 pending=0 的 KPIValue
+                db.add(KPIValueCollectLog(
+                    entity_id=m.entity_id,
+                    kpi_id=m.kpi_id,
+                    period=period,
+                    source_table=m.source_table,
+                    collected_value=None,
+                    status="skipped",
+                    message=message,
+                ))
+                continue
             db.add(KPIValueCollectLog(
                 entity_id=m.entity_id,
                 kpi_id=m.kpi_id,