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bundeslandFromRegion() derives one of the 16 Bundesland names from a region's NUTS-1 (3-char) prefix; nutsPrefixFor() reverses a Bundesland name back to its prefix for the query builder. Null-safe throughout — 7/7 tests green, validated against real region samples from the live DB. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>