feat(exporter): 增强行数统计功能以支持SQL日志记录

- 在CountRowsFast函数中添加行数统计SQL的日志记录，方便排查估算问题
- 更新前端行数显示逻辑，优化评估状态的处理，确保用户界面友好性
- 提升代码可读性，确保日志记录和行数显示逻辑清晰明了

server/internal/exporter/stream.go

@@ -156,6 +156,15 @@ func CountRowsFast(db *sql.DB, ds, main string, filters map[string]interface{})
 			args = append(args, v)
 		}
 	}
+	// 记录行数统计 SQL，方便排查估算问题
+	logging.JSON("INFO", map[string]interface{}{
+		"event":     "count_fast_query",
+		"datasource": ds,
+		"main":       main,
+		"sql":        q,
+		"args":       args,
+		"filters":    filters,
+	})
 	row := db.QueryRow(q, args...)
 	var c int64
 	if err := row.Scan(&c); err != nil {

web/index.html

@@ -67,7 +67,13 @@
               
               <el-table-column label="行数">
                 <template #default="scope">
-                  {{ Number(scope.row.row_estimate||0) > 0 ? Number(scope.row.row_estimate||0) : '评估中' }}
+                  {{
+                    scope.row.eval_status
+                      ? Number(scope.row.row_estimate || 0).toLocaleString()
+                      : (Number(scope.row.row_estimate || 0) > 0
+                          ? Number(scope.row.row_estimate || 0).toLocaleString()
+                          : '评估中')
+                  }}
                 </template>
               </el-table-column>
               <el-table-column prop="total_rows" label="已写行数"></el-table-column>