fix:countTodayByCreateTime方法加上null值判断

liding

2026-05-27 67647a9bdb5ca2c0acf5c5f635ec28d2e4d6c9db

 src/main/java/com/ruoyi/device/pojo/DeviceMaintenance.java

@@ -37,7 +37,7 @@
    @Schema(description = "最后执行时间")
    private LocalDateTime lastExecutionTime;

    @Schema(description = "设备类目")
    @Schema(description = "设备项目")
    private String machineryCategory;