fix: handle non-UTF-8 encoded and semicolon-delimited CSV exports#1
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Sales exports from the ICON system can arrive in Mac OS Roman encoding (instead of UTF-8) and use semicolons as delimiters (instead of commas). The processor rejected these files because the ö in "Gesamtsumme Erlös" was destroyed by the UTF-8 fallback decoder, failing header validation. Fixes: - Smart encoding detection: tries UTF-8, mac_roman, cp1252, latin-1 and picks the first encoding where expected headers are actually found - Unicode-normalized header matching (NFC + whitespace collapse) - Auto-detect delimiter (; vs ,) from the header row - Relaxed KDE customer header detection to ignore summary numeric columns Also adds a Next.js Route Handler (src/app/api/process/route.ts) that proxies to the Python script locally, so `next dev` can serve the API without needing `vercel dev` or a linked Vercel project. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Smart encoding detection for CSV uploads — tries UTF-8, Mac OS Roman, cp1252, latin-1 and picks the first where expected headers match
Unicode-normalized header matching so
Gesamtsumme Erlösis found regardless of encoding quirksAuto-detect
;vs,delimiter from the header rowRelaxed KDE customer header detection to handle exports where summary numbers appear on the customer row
Added Next.js Route Handler (
src/app/api/process/route.ts) so the Python processing works withnext devlocally without needingvercel devContext
Sales exports from the ICON system can arrive in Mac OS Roman encoding with semicolon delimiters. The processor rejected these files because the
öin "Gesamtsumme Erlös" was destroyed by the UTF-8 fallback decoder, failing header validation.