refactor(symbols): 优化K线历史数据加载逻辑

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yesterday c4d7235172c0d4c451b3bd71d5520e15bf8fde66

 src/main/java/com/xcong/excoin/modules/contract/entity/ContractHoldOrderEntity.java

@@ -161,6 +161,6 @@
    /**
     * 已实现盈亏
     */
    @TableField(exist = false)
//    @TableField(exist = false)
    private BigDecimal rewardAmount;
}