Uploading a .xlsx file no longer becomes a generic downloadable binary -
it's read server-side with openpyxl and converted to a csv artifact,
rendering in the same interactive grid as a native CSV post. Detected by
content type or .xlsx extension (some clients send generic/incorrect
content types for multipart uploads). Only the active sheet converts;
formula cells use whatever cached result the spreadsheet software last
saved (openpyxl doesn't evaluate formulas itself). Corrupt/unreadable
files return 400.
Since the existing posting script already forwards any non-text file via
multipart with no special-casing, `daybook_post.py balance_sheet.xlsx`
already works with zero script changes - verified live.
Two real bugs found and fixed while building this, both now covered by
regression tests:
- {**a_querydict, ...} silently wrapped every value (including title) in
a list - Python's ** spread on a dict subclass bypasses QueryDict's
__getitem__ override and exposes its internal one-list-per-key storage
directly. Fixed by building the delegated dict explicitly via .get().
- Pre-setting None for absent optional fields (e.g. source_prompt) defeated
create_text_artifact's own data.get(field, default) calls, since .get()
only falls through to its default when the key is *missing*, not when
the value is None - caused a NOT NULL constraint failure. Fixed by only
setting keys that were actually provided.
- csv.writer's default "\r\n" terminator was getting doubled by
Path.write_text()'s own newline translation on Windows, producing a
blank line between every row. Fixed with lineterminator="\n".
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
peter
4b5ec09ae2