Just as title says, a first iteration of having updated POIs in OSM (and OM, consequently) is adding the check_date
tag when creating or updating POIs. Already discussed in #6811 and #7036.
What I'm proposing here is to simply add check_date
when a POI is created or edited. Nothing fancy, nothing visible to the user (yet), no Place Page modifications, nothing. The user would never know (at this point) this tag was inserted.
Updating OSM API is really not an option (latest version from 2009, with some minor updates since).
This tag has a good support already (EveryDoor and StreetComplete, AFAIK), and could be a first step in using this information here in the future. Additionally, can benefit A LOT OSM mappers.
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