[Tagging] Meaning of check_date

[Raphael]

Dear fellow mappers,

StreetComplete sets a check_date=* tag if a user answers a "Is this
[feature] still here?" question with "yes". However, the wiki entry
for check_date=* [1] says:

> Date of latest review of the data [...] The tag is intended to document the last date, when an object as a whole or specific tags of the object were checked and verified. [...] To indicate the review of specific tags the key is built from multiple words separated by colons like check_date:collection_times=* or check_date:opening_hours=*. [...]

It is clear to me that check_date=* means that all properties (or at
least all that are verifiable on site) were checked on that date, not
only its existence. Besides, there is no other tag with the meaning
"everything last checked on" while there there are tags for "existence
last checked on" and adding the same number of check_date:<property>
tags as a feature has tags seems impractical.

(For example, when used for a shop=* with opening_hours=* or an
amenity=post_box with collection_times=*, i expect
check_date=2021-07-31 to mean that it's opening hours or collection
times, respectively, have been last checked on 31 July 2021 too, not
only its existence, also because this information changes more often
than its existence.)

Therefore, i think that another tag should be used for the date on
which a feature was last checked for existence. However, the developer
of StreetComplete thinks that this is the meaning of check_date=*. [2]

How do you understand check_date=*?

(And if you think that check_date=* only means "existence last checked
on", how would you tag "object as a whole last checked on"?)

Best regards

Raphael (dafadllyn)

[1]: https://wiki.openstreetmap.org/wiki/Key:check_date
[2]: https://github.com/streetcomplete/StreetComplete/issues/3110