Andreas Gerstmayr

This is already implemented for the storage secret, and should be extended to the OIDC secret as well.

I guess this can be closed based on https://github.com/grafana/loki/issues/8181?

> Thanks for your contribution. I understand the problem you are trying to solve, but I am not convinced that this function is a proper solution. For starters, the `last_day()`...

With the new `date_trunc()` function we could remove `yearmonth()` (previously called `ymonth()` in beancount.query), as it's the same as `date_trunc("month", date)`.

Thanks for the review! I've implemented your suggestions.

Thank you for the reviews and merging!