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Maurice
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A corridor full of petrol stations was a row of identical coloured dots, and the one thing that tells them apart is the brand. OSM carries brand:wikidata on most of them — 88% of the fuel stations in a Berlin box — Wikidata carries the logo as property P154, and Commons serves it. The bytes are proxied and cached rather than linked: one self-hosted instance asking Wikimedia for a handful of logos is a very different egress profile from every visitor's browser announcing which petrol stations they are looking at. The cache is in memory because a GET must not write to the database, and there are only so many fuel brands; a brand with no logo is remembered too, or every pan would ask again. A logo-less or unreachable brand answers 204 and the pin keeps its category icon, so nothing depends on Wikidata being reachable. Both renderers show it, since both read the same category table.