Plastik ve Makina — condition is a field on the record, so the list never splits
A trade listings platform for people buying and selling plastics processing machinery. The decision that matters happens when the new and used versions of one model can be priced against each other, which is impossible once they sit in separate catalogues. So condition never became a catalogue. It stayed a field on the listing record, and search uses it to narrow rather than divide. The category tree is cut from one machine family's own distinctions, not a broad industrial heading. Laravel assembles the list on the server and Inertia carries it, so narrowing refreshes results in place. MySQL stores, Redis caches, Tailwind shapes.
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