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fix: auto-detect CSV delimiter (comma, semicolon, tab)

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German Excel/CRM exports often use semicolons instead of commas.
The parser now uses csv.Sniffer to auto-detect the delimiter,
fixing the issue where semicolon-delimited CSVs produced 0 rows.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
CCS Admin 2026-02-24 23:09:16 +00:00
parent f8a8befb19
commit 400520aebd
1 changed files with 10 additions and 1 deletions
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11
backend/app/services/csv_parser.py
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@ -76,7 +76,16 @@ def parse_csv(content: bytes, filename: str = "") -> list[ParsedCase]:
and logged.
"""
text = content.decode("utf-8-sig") # Handle BOM
reader = csv.DictReader(io.StringIO(text))
# Auto-detect delimiter (comma vs semicolon) from first few lines
try:
dialect = csv.Sniffer().sniff(text[:2048], delimiters=",;\t")
delimiter = dialect.delimiter
except csv.Error:
delimiter = ","
logger.debug("CSV delimiter detected as %r for %s", delimiter, filename)
reader = csv.DictReader(io.StringIO(text), delimiter=delimiter)
cases: list[ParsedCase] = []
errors: list[str] = []
skipped = 0