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fix: report custom query CSV truncation in response headers

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Expose the row limit and truncation flag so clients can detect incomplete CSV exports. Keep custom query CSV within the configured limit when it equals the page size. Fixes #1553.
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kokokoXUY 2026-09-26 11:41:45 +08:00
commit 28c411679c
4 changed files with 95 additions and 2 deletions
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7
docs/csv_export.rst
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@ -45,6 +45,13 @@ The following options can be used to customize the CSVs returned by Datasette.
``?_dl=on``
Causes Datasette to return a ``content-disposition: attachment; filename="filename.csv"`` header.
Custom SQL query CSV responses include a ``Datasette-Truncated`` response
header with the value ``true`` or ``false``. A value of ``true`` means rows
were omitted because of the :ref:`setting_max_returned_rows` limit. The
``Datasette-Max-Returned-Rows`` header reports that limit, including ``0``
when it is disabled. These headers are also available to cross-origin browser
clients when CORS is enabled.
Streaming all records
---------------------