feat: Add year and second to Timestamp when exporting CSV

[Yousa-Mirage]

Description

Previously, when exporting CSV, timestamps were converted to the format MM/dd HH:mm, missing the year and second information, which caused confusion when there was cross-year data and made it impossible to accurately distinguish the order of items.

Change

Change to yyyy-MM-dd HH:mm:ss format for clearer time export.

[SakiRinn]

Could you also modify the date display format on the history page to make it consistent? I think this would be a good PR.

[Yousa-Mirage]

I compiled the app and it works well. Both time is yyyy-MM-dd HH:mm:ss now.

In history display:

In exported CSV:

[SakiRinn]

I am concerned about version compatibility and whether the new software supports the database date format of the old version.

I think you should provide backward compatibility for the legacy database. If the system detects an old version, it should trigger an automatic conversion. This allows users to migrate to the new version smoothly and seamlessly.

[Yousa-Mirage]

Can you tell me what the date format is in the old version of the database? I only know that the current database stores timestamps so that they can be converted into various time formats.

您能否告知旧版数据库中的日期格式是什么？我只知道当前数据库存放的是时间戳，以便转为各种时间格式。

[SakiRinn]

After evaluation, we found no compatibility issues and the merge has been completed.
Thank you for your contribution!

[Yousa-Mirage]

Thank you