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Add core/domain boundary doc; clarify lots (mixed year/unit per variety)

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vjrj 2026-07-07 01:49:35 +02:00
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docs/design/data-model.md
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@ -62,7 +62,7 @@ The lightweight offline catalog (Wikidata CC0 + GBIF CC-BY). Users may add local
Localized common names for the catalog live in `SpeciesCommonName(species_id, name, language)` and are bundled too.
### 2.3 `Lot` — a batch you hold
Zero or more per `Variety` (the 2023 batch and the 2024 batch are different lots).
Zero or more per `Variety`, each with its **own year and its own unit** — and units may differ between lots of the same variety. A single maize variety can hold, at once: `[2 cobs · 2024]`, `[a few loose seeds · 2023]`, `[a cup · 2022]`. Even the same variety+year in two forms (2 cobs *and* loose kernels from 2024) is just two lots. A `Lot` = one homogeneous batch. This is exactly why quantity and unit live here, not on `Variety`.
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