Keep tags each period

[Bugsbane]

Is your feature request related to a problem? Please describe.
A big part of the power of Buckwheat for me is being able to keep the budgeting period very short (1 week) to the effects of my spending are very clear and immediate.

The downside of this is that Buckwheat deletes all my used tags after each period and I end up having to set up the same tags again and again every week.

Describe the solution you'd like
At least, just don't delete tags still attached to expenses at the end of each period.

Describe alternatives you've considered
An option at the end of the budget period to keep tags or not. This would add to extra options unnecessarily though.
Another option would be a "Tag editor" section of the app where you could rename and delete tags. This seems unnecessarily complicated though for what's needed.