feat: 增加金字塔选股任务

leopard-core/src/main/java/com/lanyuanxiaoyao/leopard/core/service/selector/PyramidStockSelector.java

@@ -12,6 +12,7 @@ import java.util.stream.Collectors;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 /**
  * 金字塔选股
@@ -28,6 +29,7 @@ public class PyramidStockSelector implements StockSelector<PyramidStockSelector.
     this.stockRepository = stockRepository;
   }
 
+  @Transactional(readOnly = true)
   @Override
   public Set<Candidate> select(Request request) {
     // 选择至少有最近5年财报的股票