Am 25.07.2020 um 03:45 schrieb Jarek Piórkowski: > .... > Well, a new API endpoint _could_ automatically read through the entire > history of a node and note which tags changed when. It would > essentially be doing what I do when I open the node history in JOSM > and look when tags changed - only automated. That might well be faster > in the API, where database accesses and data processing is faster. It > would be slower than a dedicated database field, but would not require > the database migration. > No this wouldn't be useful, because what you -actually- want is the information when the tags have stayed the same, because they have validated/surveyed, by definition this cannot be determined from historic objects.
It is completely possible to add this functionality to the API in a backwards compatible fashion, at the cost of a long per tag in the current table (assuming that we don't need the information for historic object versions, so at a reasonable cost space wise. There are a couple of semantic issues that need to be considered but definitely not rocket science. Where the big effort is likely adapting the internal tools (database dumps etc), cgi-map and in the end migrating the database. If I can find some time over the next months I might prototype this, but if somebody can do it earlier pls be my guest. Simon PS: we just had this discussion on tagging btw in case nobody noticed.
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